4 * Client-side XDR for NFSv4.
6 * Copyright (c) 2002 The Regents of the University of Michigan.
9 * Kendrick Smith <kmsmith@umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
41 #include <linux/kernel.h>
42 #include <linux/slab.h>
44 #include <linux/nfs_fs.h>
45 #include <linux/kthread.h>
46 #include <linux/module.h>
47 #include <linux/random.h>
48 #include <linux/ratelimit.h>
49 #include <linux/workqueue.h>
50 #include <linux/bitops.h>
51 #include <linux/jiffies.h>
53 #include <linux/sunrpc/clnt.h>
57 #include "delegation.h"
59 #include "nfs4idmap.h"
60 #include "nfs4session.h"
64 #define NFSDBG_FACILITY NFSDBG_STATE
66 #define OPENOWNER_POOL_SIZE 8
68 const nfs4_stateid zero_stateid = {
70 .type = NFS4_SPECIAL_STATEID_TYPE,
72 static DEFINE_MUTEX(nfs_clid_init_mutex);
74 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
76 struct nfs4_setclientid_res clid = {
77 .clientid = clp->cl_clientid,
78 .confirm = clp->cl_confirm,
82 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
84 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
86 port = nn->nfs_callback_tcpport;
87 if (clp->cl_addr.ss_family == AF_INET6)
88 port = nn->nfs_callback_tcpport6;
90 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
93 clp->cl_clientid = clid.clientid;
94 clp->cl_confirm = clid.confirm;
95 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
97 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
100 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
101 nfs4_schedule_state_renewal(clp);
107 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
109 * @clp: nfs_client under test
110 * @result: OUT: found nfs_client, or clp
111 * @cred: credential to use for trunking test
113 * Returns zero, a negative errno, or a negative NFS4ERR status.
114 * If zero is returned, an nfs_client pointer is planted in
117 * Note: The returned client may not yet be marked ready.
119 int nfs40_discover_server_trunking(struct nfs_client *clp,
120 struct nfs_client **result,
121 struct rpc_cred *cred)
123 struct nfs4_setclientid_res clid = {
124 .clientid = clp->cl_clientid,
125 .confirm = clp->cl_confirm,
127 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
131 port = nn->nfs_callback_tcpport;
132 if (clp->cl_addr.ss_family == AF_INET6)
133 port = nn->nfs_callback_tcpport6;
135 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
138 clp->cl_clientid = clid.clientid;
139 clp->cl_confirm = clid.confirm;
141 status = nfs40_walk_client_list(clp, result, cred);
143 /* Sustain the lease, even if it's empty. If the clientid4
144 * goes stale it's of no use for trunking discovery. */
145 nfs4_schedule_state_renewal(*result);
151 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
153 struct rpc_cred *cred = NULL;
155 if (clp->cl_machine_cred != NULL)
156 cred = get_rpccred(clp->cl_machine_cred);
160 static void nfs4_root_machine_cred(struct nfs_client *clp)
162 struct rpc_cred *cred, *new;
164 new = rpc_lookup_machine_cred(NULL);
165 spin_lock(&clp->cl_lock);
166 cred = clp->cl_machine_cred;
167 clp->cl_machine_cred = new;
168 spin_unlock(&clp->cl_lock);
173 static struct rpc_cred *
174 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
176 struct rpc_cred *cred = NULL;
177 struct nfs4_state_owner *sp;
180 for (pos = rb_first(&server->state_owners);
182 pos = rb_next(pos)) {
183 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
184 if (list_empty(&sp->so_states))
186 cred = get_rpccred(sp->so_cred);
193 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
194 * @clp: client state handle
196 * Returns an rpc_cred with reference count bumped, or NULL.
197 * Caller must hold clp->cl_lock.
199 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
201 struct rpc_cred *cred = NULL;
202 struct nfs_server *server;
204 /* Use machine credentials if available */
205 cred = nfs4_get_machine_cred_locked(clp);
210 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
211 cred = nfs4_get_renew_cred_server_locked(server);
221 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
223 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
224 spin_lock(&tbl->slot_tbl_lock);
225 nfs41_wake_slot_table(tbl);
226 spin_unlock(&tbl->slot_tbl_lock);
230 static void nfs4_end_drain_session(struct nfs_client *clp)
232 struct nfs4_session *ses = clp->cl_session;
234 if (clp->cl_slot_tbl) {
235 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
240 nfs4_end_drain_slot_table(&ses->bc_slot_table);
241 nfs4_end_drain_slot_table(&ses->fc_slot_table);
245 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
247 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
248 spin_lock(&tbl->slot_tbl_lock);
249 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
250 reinit_completion(&tbl->complete);
251 spin_unlock(&tbl->slot_tbl_lock);
252 return wait_for_completion_interruptible(&tbl->complete);
254 spin_unlock(&tbl->slot_tbl_lock);
258 static int nfs4_begin_drain_session(struct nfs_client *clp)
260 struct nfs4_session *ses = clp->cl_session;
263 if (clp->cl_slot_tbl)
264 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
267 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
271 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
274 #if defined(CONFIG_NFS_V4_1)
276 static int nfs41_setup_state_renewal(struct nfs_client *clp)
279 struct nfs_fsinfo fsinfo;
282 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
283 nfs4_schedule_state_renewal(clp);
288 status = nfs4_proc_get_lease_time(clp, &fsinfo);
290 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
291 nfs4_schedule_state_renewal(clp);
297 static void nfs41_finish_session_reset(struct nfs_client *clp)
299 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
300 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
301 /* create_session negotiated new slot table */
302 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
303 nfs41_setup_state_renewal(clp);
306 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
310 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
312 status = nfs4_proc_exchange_id(clp, cred);
315 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
317 status = nfs4_proc_create_session(clp, cred);
320 nfs41_finish_session_reset(clp);
321 nfs_mark_client_ready(clp, NFS_CS_READY);
327 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
329 * @clp: nfs_client under test
330 * @result: OUT: found nfs_client, or clp
331 * @cred: credential to use for trunking test
333 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
334 * If NFS4_OK is returned, an nfs_client pointer is planted in
337 * Note: The returned client may not yet be marked ready.
339 int nfs41_discover_server_trunking(struct nfs_client *clp,
340 struct nfs_client **result,
341 struct rpc_cred *cred)
345 status = nfs4_proc_exchange_id(clp, cred);
346 if (status != NFS4_OK)
349 status = nfs41_walk_client_list(clp, result, cred);
355 /* Purge state if the client id was established in a prior instance */
356 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R)
357 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
359 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
360 nfs4_schedule_state_manager(clp);
361 status = nfs_wait_client_init_complete(clp);
367 #endif /* CONFIG_NFS_V4_1 */
370 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
371 * @clp: client state handle
373 * Returns an rpc_cred with reference count bumped, or NULL.
375 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
377 struct rpc_cred *cred;
379 spin_lock(&clp->cl_lock);
380 cred = nfs4_get_machine_cred_locked(clp);
381 spin_unlock(&clp->cl_lock);
385 static struct nfs4_state_owner *
386 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
388 struct rb_node **p = &server->state_owners.rb_node,
390 struct nfs4_state_owner *sp;
394 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
396 if (cred < sp->so_cred)
397 p = &parent->rb_left;
398 else if (cred > sp->so_cred)
399 p = &parent->rb_right;
401 if (!list_empty(&sp->so_lru))
402 list_del_init(&sp->so_lru);
403 atomic_inc(&sp->so_count);
410 static struct nfs4_state_owner *
411 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
413 struct nfs_server *server = new->so_server;
414 struct rb_node **p = &server->state_owners.rb_node,
416 struct nfs4_state_owner *sp;
421 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
423 if (new->so_cred < sp->so_cred)
424 p = &parent->rb_left;
425 else if (new->so_cred > sp->so_cred)
426 p = &parent->rb_right;
428 if (!list_empty(&sp->so_lru))
429 list_del_init(&sp->so_lru);
430 atomic_inc(&sp->so_count);
434 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
437 rb_link_node(&new->so_server_node, parent, p);
438 rb_insert_color(&new->so_server_node, &server->state_owners);
443 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
445 struct nfs_server *server = sp->so_server;
447 if (!RB_EMPTY_NODE(&sp->so_server_node))
448 rb_erase(&sp->so_server_node, &server->state_owners);
449 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
453 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
455 sc->create_time = ktime_get();
458 spin_lock_init(&sc->lock);
459 INIT_LIST_HEAD(&sc->list);
460 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
464 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
466 rpc_destroy_wait_queue(&sc->wait);
470 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
471 * create a new state_owner.
474 static struct nfs4_state_owner *
475 nfs4_alloc_state_owner(struct nfs_server *server,
476 struct rpc_cred *cred,
479 struct nfs4_state_owner *sp;
481 sp = kzalloc(sizeof(*sp), gfp_flags);
484 sp->so_server = server;
485 sp->so_cred = get_rpccred(cred);
486 spin_lock_init(&sp->so_lock);
487 INIT_LIST_HEAD(&sp->so_states);
488 nfs4_init_seqid_counter(&sp->so_seqid);
489 atomic_set(&sp->so_count, 1);
490 INIT_LIST_HEAD(&sp->so_lru);
491 seqcount_init(&sp->so_reclaim_seqcount);
492 mutex_init(&sp->so_delegreturn_mutex);
497 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
499 struct rb_node *rb_node = &sp->so_server_node;
501 if (!RB_EMPTY_NODE(rb_node)) {
502 struct nfs_server *server = sp->so_server;
503 struct nfs_client *clp = server->nfs_client;
505 spin_lock(&clp->cl_lock);
506 if (!RB_EMPTY_NODE(rb_node)) {
507 rb_erase(rb_node, &server->state_owners);
508 RB_CLEAR_NODE(rb_node);
510 spin_unlock(&clp->cl_lock);
514 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
516 nfs4_destroy_seqid_counter(&sp->so_seqid);
517 put_rpccred(sp->so_cred);
521 static void nfs4_gc_state_owners(struct nfs_server *server)
523 struct nfs_client *clp = server->nfs_client;
524 struct nfs4_state_owner *sp, *tmp;
525 unsigned long time_min, time_max;
528 spin_lock(&clp->cl_lock);
530 time_min = (long)time_max - (long)clp->cl_lease_time;
531 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
532 /* NB: LRU is sorted so that oldest is at the head */
533 if (time_in_range(sp->so_expires, time_min, time_max))
535 list_move(&sp->so_lru, &doomed);
536 nfs4_remove_state_owner_locked(sp);
538 spin_unlock(&clp->cl_lock);
540 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
541 list_del(&sp->so_lru);
542 nfs4_free_state_owner(sp);
547 * nfs4_get_state_owner - Look up a state owner given a credential
548 * @server: nfs_server to search
549 * @cred: RPC credential to match
551 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
553 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
554 struct rpc_cred *cred,
557 struct nfs_client *clp = server->nfs_client;
558 struct nfs4_state_owner *sp, *new;
560 spin_lock(&clp->cl_lock);
561 sp = nfs4_find_state_owner_locked(server, cred);
562 spin_unlock(&clp->cl_lock);
565 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
569 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
571 spin_lock(&clp->cl_lock);
572 sp = nfs4_insert_state_owner_locked(new);
573 spin_unlock(&clp->cl_lock);
574 } while (sp == ERR_PTR(-EAGAIN));
576 nfs4_free_state_owner(new);
578 nfs4_gc_state_owners(server);
583 * nfs4_put_state_owner - Release a nfs4_state_owner
584 * @sp: state owner data to release
586 * Note that we keep released state owners on an LRU
588 * This caches valid state owners so that they can be
589 * reused, to avoid the OPEN_CONFIRM on minor version 0.
590 * It also pins the uniquifier of dropped state owners for
591 * a while, to ensure that those state owner names are
594 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
596 struct nfs_server *server = sp->so_server;
597 struct nfs_client *clp = server->nfs_client;
599 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
602 sp->so_expires = jiffies;
603 list_add_tail(&sp->so_lru, &server->state_owners_lru);
604 spin_unlock(&clp->cl_lock);
608 * nfs4_purge_state_owners - Release all cached state owners
609 * @server: nfs_server with cached state owners to release
611 * Called at umount time. Remaining state owners will be on
612 * the LRU with ref count of zero.
614 void nfs4_purge_state_owners(struct nfs_server *server)
616 struct nfs_client *clp = server->nfs_client;
617 struct nfs4_state_owner *sp, *tmp;
620 spin_lock(&clp->cl_lock);
621 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
622 list_move(&sp->so_lru, &doomed);
623 nfs4_remove_state_owner_locked(sp);
625 spin_unlock(&clp->cl_lock);
627 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
628 list_del(&sp->so_lru);
629 nfs4_free_state_owner(sp);
633 static struct nfs4_state *
634 nfs4_alloc_open_state(void)
636 struct nfs4_state *state;
638 state = kzalloc(sizeof(*state), GFP_NOFS);
641 atomic_set(&state->count, 1);
642 INIT_LIST_HEAD(&state->lock_states);
643 spin_lock_init(&state->state_lock);
644 seqlock_init(&state->seqlock);
649 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
651 if (state->state == fmode)
653 /* NB! List reordering - see the reclaim code for why. */
654 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
655 if (fmode & FMODE_WRITE)
656 list_move(&state->open_states, &state->owner->so_states);
658 list_move_tail(&state->open_states, &state->owner->so_states);
660 state->state = fmode;
663 static struct nfs4_state *
664 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
666 struct nfs_inode *nfsi = NFS_I(inode);
667 struct nfs4_state *state;
669 list_for_each_entry(state, &nfsi->open_states, inode_states) {
670 if (state->owner != owner)
672 if (!nfs4_valid_open_stateid(state))
674 if (atomic_inc_not_zero(&state->count))
681 nfs4_free_open_state(struct nfs4_state *state)
687 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
689 struct nfs4_state *state, *new;
690 struct nfs_inode *nfsi = NFS_I(inode);
692 spin_lock(&inode->i_lock);
693 state = __nfs4_find_state_byowner(inode, owner);
694 spin_unlock(&inode->i_lock);
697 new = nfs4_alloc_open_state();
698 spin_lock(&owner->so_lock);
699 spin_lock(&inode->i_lock);
700 state = __nfs4_find_state_byowner(inode, owner);
701 if (state == NULL && new != NULL) {
703 state->owner = owner;
704 atomic_inc(&owner->so_count);
705 list_add(&state->inode_states, &nfsi->open_states);
707 state->inode = inode;
708 spin_unlock(&inode->i_lock);
709 /* Note: The reclaim code dictates that we add stateless
710 * and read-only stateids to the end of the list */
711 list_add_tail(&state->open_states, &owner->so_states);
712 spin_unlock(&owner->so_lock);
714 spin_unlock(&inode->i_lock);
715 spin_unlock(&owner->so_lock);
717 nfs4_free_open_state(new);
723 void nfs4_put_open_state(struct nfs4_state *state)
725 struct inode *inode = state->inode;
726 struct nfs4_state_owner *owner = state->owner;
728 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
730 spin_lock(&inode->i_lock);
731 list_del(&state->inode_states);
732 list_del(&state->open_states);
733 spin_unlock(&inode->i_lock);
734 spin_unlock(&owner->so_lock);
736 nfs4_free_open_state(state);
737 nfs4_put_state_owner(owner);
741 * Close the current file.
743 static void __nfs4_close(struct nfs4_state *state,
744 fmode_t fmode, gfp_t gfp_mask, int wait)
746 struct nfs4_state_owner *owner = state->owner;
750 atomic_inc(&owner->so_count);
751 /* Protect against nfs4_find_state() */
752 spin_lock(&owner->so_lock);
753 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
760 case FMODE_READ|FMODE_WRITE:
763 newstate = FMODE_READ|FMODE_WRITE;
764 if (state->n_rdwr == 0) {
765 if (state->n_rdonly == 0) {
766 newstate &= ~FMODE_READ;
767 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
768 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
770 if (state->n_wronly == 0) {
771 newstate &= ~FMODE_WRITE;
772 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
773 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
776 clear_bit(NFS_DELEGATED_STATE, &state->flags);
778 nfs4_state_set_mode_locked(state, newstate);
779 spin_unlock(&owner->so_lock);
782 nfs4_put_open_state(state);
783 nfs4_put_state_owner(owner);
785 nfs4_do_close(state, gfp_mask, wait);
788 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
790 __nfs4_close(state, fmode, GFP_NOFS, 0);
793 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
795 __nfs4_close(state, fmode, GFP_KERNEL, 1);
799 * Search the state->lock_states for an existing lock_owner
800 * that is compatible with current->files
802 static struct nfs4_lock_state *
803 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
805 struct nfs4_lock_state *pos;
806 list_for_each_entry(pos, &state->lock_states, ls_locks) {
807 if (pos->ls_owner != fl_owner)
809 atomic_inc(&pos->ls_count);
816 * Return a compatible lock_state. If no initialized lock_state structure
817 * exists, return an uninitialized one.
820 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
822 struct nfs4_lock_state *lsp;
823 struct nfs_server *server = state->owner->so_server;
825 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
828 nfs4_init_seqid_counter(&lsp->ls_seqid);
829 atomic_set(&lsp->ls_count, 1);
830 lsp->ls_state = state;
831 lsp->ls_owner = fl_owner;
832 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
833 if (lsp->ls_seqid.owner_id < 0)
835 INIT_LIST_HEAD(&lsp->ls_locks);
842 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
844 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
845 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
850 * Return a compatible lock_state. If no initialized lock_state structure
851 * exists, return an uninitialized one.
854 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
856 struct nfs4_lock_state *lsp, *new = NULL;
859 spin_lock(&state->state_lock);
860 lsp = __nfs4_find_lock_state(state, owner);
864 list_add(&new->ls_locks, &state->lock_states);
865 set_bit(LK_STATE_IN_USE, &state->flags);
870 spin_unlock(&state->state_lock);
871 new = nfs4_alloc_lock_state(state, owner);
875 spin_unlock(&state->state_lock);
877 nfs4_free_lock_state(state->owner->so_server, new);
882 * Release reference to lock_state, and free it if we see that
883 * it is no longer in use
885 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
887 struct nfs_server *server;
888 struct nfs4_state *state;
892 state = lsp->ls_state;
893 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
895 list_del(&lsp->ls_locks);
896 if (list_empty(&state->lock_states))
897 clear_bit(LK_STATE_IN_USE, &state->flags);
898 spin_unlock(&state->state_lock);
899 server = state->owner->so_server;
900 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
901 struct nfs_client *clp = server->nfs_client;
903 clp->cl_mvops->free_lock_state(server, lsp);
905 nfs4_free_lock_state(server, lsp);
908 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
910 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
912 dst->fl_u.nfs4_fl.owner = lsp;
913 atomic_inc(&lsp->ls_count);
916 static void nfs4_fl_release_lock(struct file_lock *fl)
918 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
921 static const struct file_lock_operations nfs4_fl_lock_ops = {
922 .fl_copy_lock = nfs4_fl_copy_lock,
923 .fl_release_private = nfs4_fl_release_lock,
926 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
928 struct nfs4_lock_state *lsp;
930 if (fl->fl_ops != NULL)
932 lsp = nfs4_get_lock_state(state, fl->fl_owner);
935 fl->fl_u.nfs4_fl.owner = lsp;
936 fl->fl_ops = &nfs4_fl_lock_ops;
940 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
941 struct nfs4_state *state,
942 const struct nfs_lockowner *lockowner)
944 struct nfs4_lock_state *lsp;
949 if (lockowner == NULL)
952 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
955 fl_owner = lockowner->l_owner;
956 spin_lock(&state->state_lock);
957 lsp = __nfs4_find_lock_state(state, fl_owner);
958 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
960 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
961 nfs4_stateid_copy(dst, &lsp->ls_stateid);
964 spin_unlock(&state->state_lock);
965 nfs4_put_lock_state(lsp);
970 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
972 const nfs4_stateid *src;
977 seq = read_seqbegin(&state->seqlock);
978 if (test_bit(NFS_OPEN_STATE, &state->flags))
979 src = &state->open_stateid;
980 nfs4_stateid_copy(dst, src);
981 } while (read_seqretry(&state->seqlock, seq));
985 * Byte-range lock aware utility to initialize the stateid of read/write
988 int nfs4_select_rw_stateid(struct nfs4_state *state,
989 fmode_t fmode, const struct nfs_lockowner *lockowner,
990 nfs4_stateid *dst, struct rpc_cred **cred)
994 if (!nfs4_valid_open_stateid(state))
998 ret = nfs4_copy_lock_stateid(dst, state, lockowner);
1000 /* A lost lock - don't even consider delegations */
1002 /* returns true if delegation stateid found and copied */
1003 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1008 /* nfs4_copy_delegation_stateid() didn't over-write
1009 * dst, so it still has the lock stateid which we now
1013 nfs4_copy_open_stateid(dst, state);
1016 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1021 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1023 struct nfs_seqid *new;
1025 new = kmalloc(sizeof(*new), gfp_mask);
1027 return ERR_PTR(-ENOMEM);
1028 new->sequence = counter;
1029 INIT_LIST_HEAD(&new->list);
1034 void nfs_release_seqid(struct nfs_seqid *seqid)
1036 struct nfs_seqid_counter *sequence;
1038 if (seqid == NULL || list_empty(&seqid->list))
1040 sequence = seqid->sequence;
1041 spin_lock(&sequence->lock);
1042 list_del_init(&seqid->list);
1043 if (!list_empty(&sequence->list)) {
1044 struct nfs_seqid *next;
1046 next = list_first_entry(&sequence->list,
1047 struct nfs_seqid, list);
1048 rpc_wake_up_queued_task(&sequence->wait, next->task);
1050 spin_unlock(&sequence->lock);
1053 void nfs_free_seqid(struct nfs_seqid *seqid)
1055 nfs_release_seqid(seqid);
1060 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1061 * failed with a seqid incrementing error -
1062 * see comments nfs4.h:seqid_mutating_error()
1064 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1069 case -NFS4ERR_BAD_SEQID:
1070 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1072 pr_warn_ratelimited("NFS: v4 server returned a bad"
1073 " sequence-id error on an"
1074 " unconfirmed sequence %p!\n",
1076 case -NFS4ERR_STALE_CLIENTID:
1077 case -NFS4ERR_STALE_STATEID:
1078 case -NFS4ERR_BAD_STATEID:
1079 case -NFS4ERR_BADXDR:
1080 case -NFS4ERR_RESOURCE:
1081 case -NFS4ERR_NOFILEHANDLE:
1082 /* Non-seqid mutating errors */
1086 * Note: no locking needed as we are guaranteed to be first
1087 * on the sequence list
1089 seqid->sequence->counter++;
1092 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1094 struct nfs4_state_owner *sp;
1099 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1100 if (status == -NFS4ERR_BAD_SEQID)
1101 nfs4_drop_state_owner(sp);
1102 if (!nfs4_has_session(sp->so_server->nfs_client))
1103 nfs_increment_seqid(status, seqid);
1107 * Increment the seqid if the LOCK/LOCKU succeeded, or
1108 * failed with a seqid incrementing error -
1109 * see comments nfs4.h:seqid_mutating_error()
1111 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1114 nfs_increment_seqid(status, seqid);
1117 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1119 struct nfs_seqid_counter *sequence;
1124 sequence = seqid->sequence;
1125 spin_lock(&sequence->lock);
1127 if (list_empty(&seqid->list))
1128 list_add_tail(&seqid->list, &sequence->list);
1129 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1131 rpc_sleep_on(&sequence->wait, task, NULL);
1134 spin_unlock(&sequence->lock);
1139 static int nfs4_run_state_manager(void *);
1141 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1143 smp_mb__before_atomic();
1144 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1145 smp_mb__after_atomic();
1146 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1147 rpc_wake_up(&clp->cl_rpcwaitq);
1151 * Schedule the nfs_client asynchronous state management routine
1153 void nfs4_schedule_state_manager(struct nfs_client *clp)
1155 struct task_struct *task;
1156 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1158 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1160 __module_get(THIS_MODULE);
1161 atomic_inc(&clp->cl_count);
1163 /* The rcu_read_lock() is not strictly necessary, as the state
1164 * manager is the only thread that ever changes the rpc_xprt
1165 * after it's initialized. At this point, we're single threaded. */
1167 snprintf(buf, sizeof(buf), "%s-manager",
1168 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1170 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1172 printk(KERN_ERR "%s: kthread_run: %ld\n",
1173 __func__, PTR_ERR(task));
1174 nfs4_clear_state_manager_bit(clp);
1175 nfs_put_client(clp);
1176 module_put(THIS_MODULE);
1181 * Schedule a lease recovery attempt
1183 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1187 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1188 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1189 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1191 nfs4_schedule_state_manager(clp);
1193 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1196 * nfs4_schedule_migration_recovery - trigger migration recovery
1198 * @server: FSID that is migrating
1200 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1201 * value is returned.
1203 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1205 struct nfs_client *clp = server->nfs_client;
1207 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1208 pr_err("NFS: volatile file handles not supported (server %s)\n",
1213 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1216 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1218 (unsigned long long)server->fsid.major,
1219 (unsigned long long)server->fsid.minor,
1222 set_bit(NFS_MIG_IN_TRANSITION,
1223 &((struct nfs_server *)server)->mig_status);
1224 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1226 nfs4_schedule_state_manager(clp);
1229 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1232 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1234 * @clp: server to check for moved leases
1237 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1239 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1240 __func__, clp->cl_clientid, clp->cl_hostname);
1242 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1243 nfs4_schedule_state_manager(clp);
1245 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1247 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1253 atomic_inc(&clp->cl_count);
1254 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1255 nfs_wait_bit_killable, TASK_KILLABLE);
1258 if (clp->cl_cons_state < 0)
1259 res = clp->cl_cons_state;
1261 nfs_put_client(clp);
1265 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1270 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1271 ret = nfs4_wait_clnt_recover(clp);
1274 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1275 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1277 nfs4_schedule_state_manager(clp);
1284 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1285 * @clp: client to process
1287 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1288 * resend of the SETCLIENTID and hence re-establish the
1289 * callback channel. Then return all existing delegations.
1291 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1293 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1294 nfs_expire_all_delegations(clp);
1295 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1299 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1301 nfs40_handle_cb_pathdown(clp);
1302 nfs4_schedule_state_manager(clp);
1305 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1308 if (!nfs4_valid_open_stateid(state))
1310 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1311 /* Don't recover state that expired before the reboot */
1312 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1313 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1316 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1317 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1321 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1323 if (!nfs4_valid_open_stateid(state))
1325 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1326 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1327 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1328 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1332 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1334 struct nfs_client *clp = server->nfs_client;
1336 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1338 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1340 nfs4_schedule_state_manager(clp);
1343 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1345 static struct nfs4_lock_state *
1346 nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1347 const nfs4_stateid *stateid)
1349 struct nfs4_lock_state *pos;
1351 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1352 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1354 if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
1360 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1361 const nfs4_stateid *stateid)
1365 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1366 spin_lock(&state->state_lock);
1367 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1369 spin_unlock(&state->state_lock);
1374 void nfs_inode_find_state_and_recover(struct inode *inode,
1375 const nfs4_stateid *stateid)
1377 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1378 struct nfs_inode *nfsi = NFS_I(inode);
1379 struct nfs_open_context *ctx;
1380 struct nfs4_state *state;
1383 spin_lock(&inode->i_lock);
1384 list_for_each_entry(ctx, &nfsi->open_files, list) {
1388 if (nfs4_stateid_match_other(&state->stateid, stateid) &&
1389 nfs4_state_mark_reclaim_nograce(clp, state)) {
1393 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1394 nfs4_state_mark_reclaim_nograce(clp, state))
1397 spin_unlock(&inode->i_lock);
1399 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1401 nfs4_schedule_state_manager(clp);
1404 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1406 struct inode *inode = state->inode;
1407 struct nfs_inode *nfsi = NFS_I(inode);
1408 struct nfs_open_context *ctx;
1410 spin_lock(&inode->i_lock);
1411 list_for_each_entry(ctx, &nfsi->open_files, list) {
1412 if (ctx->state != state)
1414 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1416 spin_unlock(&inode->i_lock);
1419 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1421 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1422 nfs4_state_mark_open_context_bad(state);
1426 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1428 struct inode *inode = state->inode;
1429 struct nfs_inode *nfsi = NFS_I(inode);
1430 struct file_lock *fl;
1432 struct file_lock_context *flctx = inode->i_flctx;
1433 struct list_head *list;
1438 list = &flctx->flc_posix;
1440 /* Guard against delegation returns and new lock/unlock calls */
1441 down_write(&nfsi->rwsem);
1442 spin_lock(&flctx->flc_lock);
1444 list_for_each_entry(fl, list, fl_list) {
1445 if (nfs_file_open_context(fl->fl_file)->state != state)
1447 spin_unlock(&flctx->flc_lock);
1448 status = ops->recover_lock(state, fl);
1453 case -NFS4ERR_ADMIN_REVOKED:
1454 case -NFS4ERR_STALE_STATEID:
1455 case -NFS4ERR_BAD_STATEID:
1456 case -NFS4ERR_EXPIRED:
1457 case -NFS4ERR_NO_GRACE:
1458 case -NFS4ERR_STALE_CLIENTID:
1459 case -NFS4ERR_BADSESSION:
1460 case -NFS4ERR_BADSLOT:
1461 case -NFS4ERR_BAD_HIGH_SLOT:
1462 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1465 pr_err("NFS: %s: unhandled error %d\n",
1468 case -NFS4ERR_DENIED:
1469 case -NFS4ERR_RECLAIM_BAD:
1470 case -NFS4ERR_RECLAIM_CONFLICT:
1471 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1474 spin_lock(&flctx->flc_lock);
1476 if (list == &flctx->flc_posix) {
1477 list = &flctx->flc_flock;
1480 spin_unlock(&flctx->flc_lock);
1482 up_write(&nfsi->rwsem);
1486 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1488 struct nfs4_state *state;
1489 struct nfs4_lock_state *lock;
1492 /* Note: we rely on the sp->so_states list being ordered
1493 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1495 * This is needed to ensure that the server won't give us any
1496 * read delegations that we have to return if, say, we are
1497 * recovering after a network partition or a reboot from a
1498 * server that doesn't support a grace period.
1500 spin_lock(&sp->so_lock);
1501 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1503 list_for_each_entry(state, &sp->so_states, open_states) {
1504 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1506 if (!nfs4_valid_open_stateid(state))
1508 if (state->state == 0)
1510 atomic_inc(&state->count);
1511 spin_unlock(&sp->so_lock);
1512 status = ops->recover_open(sp, state);
1514 status = nfs4_reclaim_locks(state, ops);
1516 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1517 spin_lock(&state->state_lock);
1518 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1519 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1520 pr_warn_ratelimited("NFS: "
1522 "failed!\n", __func__);
1524 spin_unlock(&state->state_lock);
1526 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
1528 nfs4_put_open_state(state);
1529 spin_lock(&sp->so_lock);
1535 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1543 /* Open state on this file cannot be recovered */
1544 nfs4_state_mark_recovery_failed(state, status);
1548 case -NFS4ERR_ADMIN_REVOKED:
1549 case -NFS4ERR_STALE_STATEID:
1550 case -NFS4ERR_BAD_STATEID:
1551 case -NFS4ERR_RECLAIM_BAD:
1552 case -NFS4ERR_RECLAIM_CONFLICT:
1553 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1555 case -NFS4ERR_EXPIRED:
1556 case -NFS4ERR_NO_GRACE:
1557 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1558 case -NFS4ERR_STALE_CLIENTID:
1559 case -NFS4ERR_BADSESSION:
1560 case -NFS4ERR_BADSLOT:
1561 case -NFS4ERR_BAD_HIGH_SLOT:
1562 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1565 nfs4_put_open_state(state);
1566 spin_lock(&sp->so_lock);
1569 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1570 spin_unlock(&sp->so_lock);
1573 nfs4_put_open_state(state);
1574 spin_lock(&sp->so_lock);
1575 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1576 spin_unlock(&sp->so_lock);
1580 static void nfs4_clear_open_state(struct nfs4_state *state)
1582 struct nfs4_lock_state *lock;
1584 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1585 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1586 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1587 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1588 spin_lock(&state->state_lock);
1589 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1590 lock->ls_seqid.flags = 0;
1591 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1593 spin_unlock(&state->state_lock);
1596 static void nfs4_reset_seqids(struct nfs_server *server,
1597 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1599 struct nfs_client *clp = server->nfs_client;
1600 struct nfs4_state_owner *sp;
1601 struct rb_node *pos;
1602 struct nfs4_state *state;
1604 spin_lock(&clp->cl_lock);
1605 for (pos = rb_first(&server->state_owners);
1607 pos = rb_next(pos)) {
1608 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1609 sp->so_seqid.flags = 0;
1610 spin_lock(&sp->so_lock);
1611 list_for_each_entry(state, &sp->so_states, open_states) {
1612 if (mark_reclaim(clp, state))
1613 nfs4_clear_open_state(state);
1615 spin_unlock(&sp->so_lock);
1617 spin_unlock(&clp->cl_lock);
1620 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1621 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1623 struct nfs_server *server;
1626 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1627 nfs4_reset_seqids(server, mark_reclaim);
1631 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1633 /* Mark all delegations for reclaim */
1634 nfs_delegation_mark_reclaim(clp);
1635 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1638 static void nfs4_reclaim_complete(struct nfs_client *clp,
1639 const struct nfs4_state_recovery_ops *ops,
1640 struct rpc_cred *cred)
1642 /* Notify the server we're done reclaiming our state */
1643 if (ops->reclaim_complete)
1644 (void)ops->reclaim_complete(clp, cred);
1647 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1649 struct nfs_client *clp = server->nfs_client;
1650 struct nfs4_state_owner *sp;
1651 struct rb_node *pos;
1652 struct nfs4_state *state;
1654 spin_lock(&clp->cl_lock);
1655 for (pos = rb_first(&server->state_owners);
1657 pos = rb_next(pos)) {
1658 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1659 spin_lock(&sp->so_lock);
1660 list_for_each_entry(state, &sp->so_states, open_states) {
1661 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1664 nfs4_state_mark_reclaim_nograce(clp, state);
1666 spin_unlock(&sp->so_lock);
1668 spin_unlock(&clp->cl_lock);
1671 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1673 struct nfs_server *server;
1675 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1679 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1680 nfs4_clear_reclaim_server(server);
1683 nfs_delegation_reap_unclaimed(clp);
1687 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1689 const struct nfs4_state_recovery_ops *ops;
1690 struct rpc_cred *cred;
1692 if (!nfs4_state_clear_reclaim_reboot(clp))
1694 ops = clp->cl_mvops->reboot_recovery_ops;
1695 cred = nfs4_get_clid_cred(clp);
1696 nfs4_reclaim_complete(clp, ops, cred);
1700 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1702 nfs_mark_test_expired_all_delegations(clp);
1703 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1706 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1711 case -NFS4ERR_CB_PATH_DOWN:
1712 nfs40_handle_cb_pathdown(clp);
1714 case -NFS4ERR_NO_GRACE:
1715 nfs4_state_end_reclaim_reboot(clp);
1717 case -NFS4ERR_STALE_CLIENTID:
1718 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1719 nfs4_state_clear_reclaim_reboot(clp);
1720 nfs4_state_start_reclaim_reboot(clp);
1722 case -NFS4ERR_EXPIRED:
1723 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1724 nfs4_state_start_reclaim_nograce(clp);
1726 case -NFS4ERR_BADSESSION:
1727 case -NFS4ERR_BADSLOT:
1728 case -NFS4ERR_BAD_HIGH_SLOT:
1729 case -NFS4ERR_DEADSESSION:
1730 case -NFS4ERR_SEQ_FALSE_RETRY:
1731 case -NFS4ERR_SEQ_MISORDERED:
1732 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1733 /* Zero session reset errors */
1735 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1736 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1739 dprintk("%s: failed to handle error %d for server %s\n",
1740 __func__, error, clp->cl_hostname);
1743 dprintk("%s: handled error %d for server %s\n", __func__, error,
1748 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1750 struct nfs4_state_owner *sp;
1751 struct nfs_server *server;
1752 struct rb_node *pos;
1757 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1758 nfs4_purge_state_owners(server);
1759 spin_lock(&clp->cl_lock);
1760 for (pos = rb_first(&server->state_owners);
1762 pos = rb_next(pos)) {
1764 struct nfs4_state_owner, so_server_node);
1765 if (!test_and_clear_bit(ops->owner_flag_bit,
1768 if (!atomic_inc_not_zero(&sp->so_count))
1770 spin_unlock(&clp->cl_lock);
1773 status = nfs4_reclaim_open_state(sp, ops);
1775 set_bit(ops->owner_flag_bit, &sp->so_flags);
1776 nfs4_put_state_owner(sp);
1777 status = nfs4_recovery_handle_error(clp, status);
1778 return (status != 0) ? status : -EAGAIN;
1781 nfs4_put_state_owner(sp);
1784 spin_unlock(&clp->cl_lock);
1790 static int nfs4_check_lease(struct nfs_client *clp)
1792 struct rpc_cred *cred;
1793 const struct nfs4_state_maintenance_ops *ops =
1794 clp->cl_mvops->state_renewal_ops;
1797 /* Is the client already known to have an expired lease? */
1798 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1800 spin_lock(&clp->cl_lock);
1801 cred = ops->get_state_renewal_cred_locked(clp);
1802 spin_unlock(&clp->cl_lock);
1804 cred = nfs4_get_clid_cred(clp);
1809 status = ops->renew_lease(clp, cred);
1811 if (status == -ETIMEDOUT) {
1812 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1816 return nfs4_recovery_handle_error(clp, status);
1819 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1820 * and for recoverable errors on EXCHANGE_ID for v4.1
1822 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1825 case -NFS4ERR_SEQ_MISORDERED:
1826 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1827 return -ESERVERFAULT;
1828 /* Lease confirmation error: retry after purging the lease */
1830 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1832 case -NFS4ERR_STALE_CLIENTID:
1833 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1834 nfs4_state_start_reclaim_reboot(clp);
1836 case -NFS4ERR_CLID_INUSE:
1837 pr_err("NFS: Server %s reports our clientid is in use\n",
1839 nfs_mark_client_ready(clp, -EPERM);
1840 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1843 case -NFS4ERR_DELAY:
1849 case -NFS4ERR_MINOR_VERS_MISMATCH:
1850 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1851 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1852 dprintk("%s: exit with error %d for server %s\n",
1853 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1854 return -EPROTONOSUPPORT;
1855 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1856 * in nfs4_exchange_id */
1858 dprintk("%s: exit with error %d for server %s\n", __func__,
1859 status, clp->cl_hostname);
1862 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1863 dprintk("%s: handled error %d for server %s\n", __func__, status,
1868 static int nfs4_establish_lease(struct nfs_client *clp)
1870 struct rpc_cred *cred;
1871 const struct nfs4_state_recovery_ops *ops =
1872 clp->cl_mvops->reboot_recovery_ops;
1875 nfs4_begin_drain_session(clp);
1876 cred = nfs4_get_clid_cred(clp);
1879 status = ops->establish_clid(clp, cred);
1883 pnfs_destroy_all_layouts(clp);
1888 * Returns zero or a negative errno. NFS4ERR values are converted
1889 * to local errno values.
1891 static int nfs4_reclaim_lease(struct nfs_client *clp)
1895 status = nfs4_establish_lease(clp);
1897 return nfs4_handle_reclaim_lease_error(clp, status);
1898 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1899 nfs4_state_start_reclaim_nograce(clp);
1900 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1901 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1902 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1903 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1907 static int nfs4_purge_lease(struct nfs_client *clp)
1911 status = nfs4_establish_lease(clp);
1913 return nfs4_handle_reclaim_lease_error(clp, status);
1914 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1915 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1916 nfs4_state_start_reclaim_nograce(clp);
1921 * Try remote migration of one FSID from a source server to a
1922 * destination server. The source server provides a list of
1923 * potential destinations.
1925 * Returns zero or a negative NFS4ERR status code.
1927 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1929 struct nfs_client *clp = server->nfs_client;
1930 struct nfs4_fs_locations *locations = NULL;
1931 struct inode *inode;
1935 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1936 (unsigned long long)server->fsid.major,
1937 (unsigned long long)server->fsid.minor,
1941 page = alloc_page(GFP_KERNEL);
1942 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1943 if (page == NULL || locations == NULL) {
1944 dprintk("<-- %s: no memory\n", __func__);
1948 inode = d_inode(server->super->s_root);
1949 result = nfs4_proc_get_locations(inode, locations, page, cred);
1951 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1956 result = -NFS4ERR_NXIO;
1957 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1958 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1963 nfs4_begin_drain_session(clp);
1965 status = nfs4_replace_transport(server, locations);
1967 dprintk("<-- %s: failed to replace transport: %d\n",
1973 dprintk("<-- %s: migration succeeded\n", __func__);
1980 pr_err("NFS: migration recovery failed (server %s)\n",
1982 set_bit(NFS_MIG_FAILED, &server->mig_status);
1988 * Returns zero or a negative NFS4ERR status code.
1990 static int nfs4_handle_migration(struct nfs_client *clp)
1992 const struct nfs4_state_maintenance_ops *ops =
1993 clp->cl_mvops->state_renewal_ops;
1994 struct nfs_server *server;
1995 struct rpc_cred *cred;
1997 dprintk("%s: migration reported on \"%s\"\n", __func__,
2000 spin_lock(&clp->cl_lock);
2001 cred = ops->get_state_renewal_cred_locked(clp);
2002 spin_unlock(&clp->cl_lock);
2004 return -NFS4ERR_NOENT;
2009 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2012 if (server->mig_gen == clp->cl_mig_gen)
2014 server->mig_gen = clp->cl_mig_gen;
2016 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2017 &server->mig_status))
2021 status = nfs4_try_migration(server, cred);
2034 * Test each nfs_server on the clp's cl_superblocks list to see
2035 * if it's moved to another server. Stop when the server no longer
2036 * returns NFS4ERR_LEASE_MOVED.
2038 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2040 const struct nfs4_state_maintenance_ops *ops =
2041 clp->cl_mvops->state_renewal_ops;
2042 struct nfs_server *server;
2043 struct rpc_cred *cred;
2045 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2048 spin_lock(&clp->cl_lock);
2049 cred = ops->get_state_renewal_cred_locked(clp);
2050 spin_unlock(&clp->cl_lock);
2052 return -NFS4ERR_NOENT;
2057 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2058 struct inode *inode;
2061 if (server->mig_gen == clp->cl_mig_gen)
2063 server->mig_gen = clp->cl_mig_gen;
2067 inode = d_inode(server->super->s_root);
2068 status = nfs4_proc_fsid_present(inode, cred);
2069 if (status != -NFS4ERR_MOVED)
2070 goto restart; /* wasn't this one */
2071 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2072 goto restart; /* there are more */
2083 * nfs4_discover_server_trunking - Detect server IP address trunking
2085 * @clp: nfs_client under test
2086 * @result: OUT: found nfs_client, or clp
2088 * Returns zero or a negative errno. If zero is returned,
2089 * an nfs_client pointer is planted in "result".
2091 * Note: since we are invoked in process context, and
2092 * not from inside the state manager, we cannot use
2093 * nfs4_handle_reclaim_lease_error().
2095 int nfs4_discover_server_trunking(struct nfs_client *clp,
2096 struct nfs_client **result)
2098 const struct nfs4_state_recovery_ops *ops =
2099 clp->cl_mvops->reboot_recovery_ops;
2100 struct rpc_clnt *clnt;
2101 struct rpc_cred *cred;
2104 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2106 clnt = clp->cl_rpcclient;
2109 mutex_lock(&nfs_clid_init_mutex);
2112 cred = nfs4_get_clid_cred(clp);
2116 status = ops->detect_trunking(clp, result, cred);
2122 if (clnt->cl_softrtry)
2124 case -NFS4ERR_DELAY:
2127 case -NFS4ERR_STALE_CLIENTID:
2128 dprintk("NFS: %s after status %d, retrying\n",
2133 nfs4_root_machine_cred(clp);
2136 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2138 case -NFS4ERR_CLID_INUSE:
2139 case -NFS4ERR_WRONGSEC:
2140 /* No point in retrying if we already used RPC_AUTH_UNIX */
2141 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2145 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2147 status = PTR_ERR(clnt);
2150 /* Note: this is safe because we haven't yet marked the
2151 * client as ready, so we are the only user of
2154 clnt = xchg(&clp->cl_rpcclient, clnt);
2155 rpc_shutdown_client(clnt);
2156 clnt = clp->cl_rpcclient;
2159 case -NFS4ERR_MINOR_VERS_MISMATCH:
2160 status = -EPROTONOSUPPORT;
2164 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2165 * in nfs4_exchange_id */
2166 status = -EKEYEXPIRED;
2169 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2175 mutex_unlock(&nfs_clid_init_mutex);
2176 dprintk("NFS: %s: status = %d\n", __func__, status);
2180 #ifdef CONFIG_NFS_V4_1
2181 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2183 struct nfs_client *clp = session->clp;
2187 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2189 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2190 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2192 nfs4_schedule_lease_recovery(clp);
2194 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2196 void nfs41_notify_server(struct nfs_client *clp)
2198 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2199 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2200 nfs4_schedule_state_manager(clp);
2203 static void nfs4_reset_all_state(struct nfs_client *clp)
2205 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2206 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2207 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2208 nfs4_state_start_reclaim_nograce(clp);
2209 dprintk("%s: scheduling reset of all state for server %s!\n",
2210 __func__, clp->cl_hostname);
2211 nfs4_schedule_state_manager(clp);
2215 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2217 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2218 nfs4_state_start_reclaim_reboot(clp);
2219 dprintk("%s: server %s rebooted!\n", __func__,
2221 nfs4_schedule_state_manager(clp);
2225 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2227 nfs4_reset_all_state(clp);
2228 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2231 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2233 nfs4_state_start_reclaim_nograce(clp);
2234 nfs4_schedule_state_manager(clp);
2236 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2239 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2241 /* FIXME: For now, we destroy all layouts. */
2242 pnfs_destroy_all_layouts(clp);
2243 /* FIXME: For now, we test all delegations+open state+locks. */
2244 nfs41_handle_some_state_revoked(clp);
2245 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2249 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2251 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2252 nfs4_schedule_state_manager(clp);
2254 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2258 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2260 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2261 &clp->cl_state) == 0)
2262 nfs4_schedule_state_manager(clp);
2265 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2271 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2272 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2274 * If we're called from the state manager thread, then assume we're
2275 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2276 * Those flags are expected to remain set until we're done
2277 * recovering (see RFC5661, section 18.46.3).
2282 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2283 nfs41_handle_server_reboot(clp);
2284 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2285 nfs41_handle_all_state_revoked(clp);
2286 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2287 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2288 nfs41_handle_some_state_revoked(clp);
2289 if (flags & SEQ4_STATUS_LEASE_MOVED)
2290 nfs4_schedule_lease_moved_recovery(clp);
2291 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2292 nfs41_handle_recallable_state_revoked(clp);
2294 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2295 nfs41_handle_backchannel_fault(clp);
2296 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2297 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2298 nfs41_handle_cb_path_down(clp);
2301 static int nfs4_reset_session(struct nfs_client *clp)
2303 struct rpc_cred *cred;
2306 if (!nfs4_has_session(clp))
2308 nfs4_begin_drain_session(clp);
2309 cred = nfs4_get_clid_cred(clp);
2310 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2313 case -NFS4ERR_BADSESSION:
2314 case -NFS4ERR_DEADSESSION:
2316 case -NFS4ERR_BACK_CHAN_BUSY:
2317 case -NFS4ERR_DELAY:
2318 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2323 status = nfs4_recovery_handle_error(clp, status);
2327 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2328 status = nfs4_proc_create_session(clp, cred);
2330 dprintk("%s: session reset failed with status %d for server %s!\n",
2331 __func__, status, clp->cl_hostname);
2332 status = nfs4_handle_reclaim_lease_error(clp, status);
2335 nfs41_finish_session_reset(clp);
2336 dprintk("%s: session reset was successful for server %s!\n",
2337 __func__, clp->cl_hostname);
2344 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2346 struct rpc_cred *cred;
2349 if (!nfs4_has_session(clp))
2351 nfs4_begin_drain_session(clp);
2352 cred = nfs4_get_clid_cred(clp);
2353 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2356 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2359 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2360 __func__, clp->cl_hostname);
2362 case -NFS4ERR_DELAY:
2364 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2367 return nfs4_recovery_handle_error(clp, ret);
2371 #else /* CONFIG_NFS_V4_1 */
2372 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2374 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2378 #endif /* CONFIG_NFS_V4_1 */
2380 static void nfs4_state_manager(struct nfs_client *clp)
2383 const char *section = "", *section_sep = "";
2385 /* Ensure exclusive access to NFSv4 state */
2387 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2388 section = "purge state";
2389 status = nfs4_purge_lease(clp);
2395 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2396 section = "lease expired";
2397 /* We're going to have to re-establish a clientid */
2398 status = nfs4_reclaim_lease(clp);
2404 /* Initialize or reset the session */
2405 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2406 section = "reset session";
2407 status = nfs4_reset_session(clp);
2408 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2414 /* Send BIND_CONN_TO_SESSION */
2415 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2417 section = "bind conn to session";
2418 status = nfs4_bind_conn_to_session(clp);
2424 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2425 section = "check lease";
2426 status = nfs4_check_lease(clp);
2432 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2433 section = "migration";
2434 status = nfs4_handle_migration(clp);
2439 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2440 section = "lease moved";
2441 status = nfs4_handle_lease_moved(clp);
2446 /* First recover reboot state... */
2447 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2448 section = "reclaim reboot";
2449 status = nfs4_do_reclaim(clp,
2450 clp->cl_mvops->reboot_recovery_ops);
2451 if (status == -EAGAIN)
2455 nfs4_state_end_reclaim_reboot(clp);
2458 /* Detect expired delegations... */
2459 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2460 section = "detect expired delegations";
2461 nfs_reap_expired_delegations(clp);
2465 /* Now recover expired state... */
2466 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2467 section = "reclaim nograce";
2468 status = nfs4_do_reclaim(clp,
2469 clp->cl_mvops->nograce_recovery_ops);
2470 if (status == -EAGAIN)
2476 nfs4_end_drain_session(clp);
2477 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2478 nfs_client_return_marked_delegations(clp);
2482 nfs4_clear_state_manager_bit(clp);
2483 /* Did we race with an attempt to give us more work? */
2484 if (clp->cl_state == 0)
2486 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2488 } while (atomic_read(&clp->cl_count) > 1);
2491 if (strlen(section))
2493 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2494 " with error %d\n", section_sep, section,
2495 clp->cl_hostname, -status);
2497 nfs4_end_drain_session(clp);
2498 nfs4_clear_state_manager_bit(clp);
2501 static int nfs4_run_state_manager(void *ptr)
2503 struct nfs_client *clp = ptr;
2505 allow_signal(SIGKILL);
2506 nfs4_state_manager(clp);
2507 nfs_put_client(clp);
2508 module_put_and_exit(0);