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/nfs_idmap.h>
46 #include <linux/kthread.h>
47 #include <linux/module.h>
48 #include <linux/random.h>
49 #include <linux/ratelimit.h>
50 #include <linux/workqueue.h>
51 #include <linux/bitops.h>
52 #include <linux/jiffies.h>
54 #include <linux/sunrpc/clnt.h>
58 #include "delegation.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);
148 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
150 struct rpc_cred *cred = NULL;
152 if (clp->cl_machine_cred != NULL)
153 cred = get_rpccred(clp->cl_machine_cred);
157 static void nfs4_root_machine_cred(struct nfs_client *clp)
159 struct rpc_cred *cred, *new;
161 new = rpc_lookup_machine_cred(NULL);
162 spin_lock(&clp->cl_lock);
163 cred = clp->cl_machine_cred;
164 clp->cl_machine_cred = new;
165 spin_unlock(&clp->cl_lock);
170 static struct rpc_cred *
171 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
173 struct rpc_cred *cred = NULL;
174 struct nfs4_state_owner *sp;
177 for (pos = rb_first(&server->state_owners);
179 pos = rb_next(pos)) {
180 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
181 if (list_empty(&sp->so_states))
183 cred = get_rpccred(sp->so_cred);
190 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
191 * @clp: client state handle
193 * Returns an rpc_cred with reference count bumped, or NULL.
194 * Caller must hold clp->cl_lock.
196 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
198 struct rpc_cred *cred = NULL;
199 struct nfs_server *server;
201 /* Use machine credentials if available */
202 cred = nfs4_get_machine_cred_locked(clp);
207 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
208 cred = nfs4_get_renew_cred_server_locked(server);
218 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
220 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
221 spin_lock(&tbl->slot_tbl_lock);
222 nfs41_wake_slot_table(tbl);
223 spin_unlock(&tbl->slot_tbl_lock);
227 static void nfs4_end_drain_session(struct nfs_client *clp)
229 struct nfs4_session *ses = clp->cl_session;
231 if (clp->cl_slot_tbl) {
232 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
237 nfs4_end_drain_slot_table(&ses->bc_slot_table);
238 nfs4_end_drain_slot_table(&ses->fc_slot_table);
242 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
244 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
245 spin_lock(&tbl->slot_tbl_lock);
246 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
247 reinit_completion(&tbl->complete);
248 spin_unlock(&tbl->slot_tbl_lock);
249 return wait_for_completion_interruptible(&tbl->complete);
251 spin_unlock(&tbl->slot_tbl_lock);
255 static int nfs4_begin_drain_session(struct nfs_client *clp)
257 struct nfs4_session *ses = clp->cl_session;
260 if (clp->cl_slot_tbl)
261 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
264 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
268 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
271 #if defined(CONFIG_NFS_V4_1)
273 static int nfs41_setup_state_renewal(struct nfs_client *clp)
276 struct nfs_fsinfo fsinfo;
278 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
279 nfs4_schedule_state_renewal(clp);
283 status = nfs4_proc_get_lease_time(clp, &fsinfo);
285 /* Update lease time and schedule renewal */
286 spin_lock(&clp->cl_lock);
287 clp->cl_lease_time = fsinfo.lease_time * HZ;
288 clp->cl_last_renewal = jiffies;
289 spin_unlock(&clp->cl_lock);
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 nfs4_begin_drain_session(clp);
313 status = nfs4_proc_exchange_id(clp, cred);
316 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
318 status = nfs4_proc_create_session(clp, cred);
321 nfs41_finish_session_reset(clp);
322 nfs_mark_client_ready(clp, NFS_CS_READY);
328 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
330 * @clp: nfs_client under test
331 * @result: OUT: found nfs_client, or clp
332 * @cred: credential to use for trunking test
334 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
335 * If NFS4_OK is returned, an nfs_client pointer is planted in
338 * Note: The returned client may not yet be marked ready.
340 int nfs41_discover_server_trunking(struct nfs_client *clp,
341 struct nfs_client **result,
342 struct rpc_cred *cred)
346 status = nfs4_proc_exchange_id(clp, cred);
347 if (status != NFS4_OK)
349 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
351 return nfs41_walk_client_list(clp, result, cred);
354 #endif /* CONFIG_NFS_V4_1 */
357 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
358 * @clp: client state handle
360 * Returns an rpc_cred with reference count bumped, or NULL.
362 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
364 struct rpc_cred *cred;
366 spin_lock(&clp->cl_lock);
367 cred = nfs4_get_machine_cred_locked(clp);
368 spin_unlock(&clp->cl_lock);
372 static struct nfs4_state_owner *
373 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
375 struct rb_node **p = &server->state_owners.rb_node,
377 struct nfs4_state_owner *sp;
381 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
383 if (cred < sp->so_cred)
384 p = &parent->rb_left;
385 else if (cred > sp->so_cred)
386 p = &parent->rb_right;
388 if (!list_empty(&sp->so_lru))
389 list_del_init(&sp->so_lru);
390 atomic_inc(&sp->so_count);
397 static struct nfs4_state_owner *
398 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
400 struct nfs_server *server = new->so_server;
401 struct rb_node **p = &server->state_owners.rb_node,
403 struct nfs4_state_owner *sp;
408 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
410 if (new->so_cred < sp->so_cred)
411 p = &parent->rb_left;
412 else if (new->so_cred > sp->so_cred)
413 p = &parent->rb_right;
415 if (!list_empty(&sp->so_lru))
416 list_del_init(&sp->so_lru);
417 atomic_inc(&sp->so_count);
421 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
424 rb_link_node(&new->so_server_node, parent, p);
425 rb_insert_color(&new->so_server_node, &server->state_owners);
430 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
432 struct nfs_server *server = sp->so_server;
434 if (!RB_EMPTY_NODE(&sp->so_server_node))
435 rb_erase(&sp->so_server_node, &server->state_owners);
436 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
440 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
442 sc->create_time = ktime_get();
445 spin_lock_init(&sc->lock);
446 INIT_LIST_HEAD(&sc->list);
447 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
451 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
453 rpc_destroy_wait_queue(&sc->wait);
457 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
458 * create a new state_owner.
461 static struct nfs4_state_owner *
462 nfs4_alloc_state_owner(struct nfs_server *server,
463 struct rpc_cred *cred,
466 struct nfs4_state_owner *sp;
468 sp = kzalloc(sizeof(*sp), gfp_flags);
471 sp->so_server = server;
472 sp->so_cred = get_rpccred(cred);
473 spin_lock_init(&sp->so_lock);
474 INIT_LIST_HEAD(&sp->so_states);
475 nfs4_init_seqid_counter(&sp->so_seqid);
476 atomic_set(&sp->so_count, 1);
477 INIT_LIST_HEAD(&sp->so_lru);
478 seqcount_init(&sp->so_reclaim_seqcount);
479 mutex_init(&sp->so_delegreturn_mutex);
484 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
486 struct rb_node *rb_node = &sp->so_server_node;
488 if (!RB_EMPTY_NODE(rb_node)) {
489 struct nfs_server *server = sp->so_server;
490 struct nfs_client *clp = server->nfs_client;
492 spin_lock(&clp->cl_lock);
493 if (!RB_EMPTY_NODE(rb_node)) {
494 rb_erase(rb_node, &server->state_owners);
495 RB_CLEAR_NODE(rb_node);
497 spin_unlock(&clp->cl_lock);
501 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
503 nfs4_destroy_seqid_counter(&sp->so_seqid);
504 put_rpccred(sp->so_cred);
508 static void nfs4_gc_state_owners(struct nfs_server *server)
510 struct nfs_client *clp = server->nfs_client;
511 struct nfs4_state_owner *sp, *tmp;
512 unsigned long time_min, time_max;
515 spin_lock(&clp->cl_lock);
517 time_min = (long)time_max - (long)clp->cl_lease_time;
518 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
519 /* NB: LRU is sorted so that oldest is at the head */
520 if (time_in_range(sp->so_expires, time_min, time_max))
522 list_move(&sp->so_lru, &doomed);
523 nfs4_remove_state_owner_locked(sp);
525 spin_unlock(&clp->cl_lock);
527 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
528 list_del(&sp->so_lru);
529 nfs4_free_state_owner(sp);
534 * nfs4_get_state_owner - Look up a state owner given a credential
535 * @server: nfs_server to search
536 * @cred: RPC credential to match
538 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
540 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
541 struct rpc_cred *cred,
544 struct nfs_client *clp = server->nfs_client;
545 struct nfs4_state_owner *sp, *new;
547 spin_lock(&clp->cl_lock);
548 sp = nfs4_find_state_owner_locked(server, cred);
549 spin_unlock(&clp->cl_lock);
552 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
556 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
558 spin_lock(&clp->cl_lock);
559 sp = nfs4_insert_state_owner_locked(new);
560 spin_unlock(&clp->cl_lock);
561 } while (sp == ERR_PTR(-EAGAIN));
563 nfs4_free_state_owner(new);
565 nfs4_gc_state_owners(server);
570 * nfs4_put_state_owner - Release a nfs4_state_owner
571 * @sp: state owner data to release
573 * Note that we keep released state owners on an LRU
575 * This caches valid state owners so that they can be
576 * reused, to avoid the OPEN_CONFIRM on minor version 0.
577 * It also pins the uniquifier of dropped state owners for
578 * a while, to ensure that those state owner names are
581 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
583 struct nfs_server *server = sp->so_server;
584 struct nfs_client *clp = server->nfs_client;
586 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
589 sp->so_expires = jiffies;
590 list_add_tail(&sp->so_lru, &server->state_owners_lru);
591 spin_unlock(&clp->cl_lock);
595 * nfs4_purge_state_owners - Release all cached state owners
596 * @server: nfs_server with cached state owners to release
598 * Called at umount time. Remaining state owners will be on
599 * the LRU with ref count of zero.
601 void nfs4_purge_state_owners(struct nfs_server *server)
603 struct nfs_client *clp = server->nfs_client;
604 struct nfs4_state_owner *sp, *tmp;
607 spin_lock(&clp->cl_lock);
608 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
609 list_move(&sp->so_lru, &doomed);
610 nfs4_remove_state_owner_locked(sp);
612 spin_unlock(&clp->cl_lock);
614 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
615 list_del(&sp->so_lru);
616 nfs4_free_state_owner(sp);
620 static struct nfs4_state *
621 nfs4_alloc_open_state(void)
623 struct nfs4_state *state;
625 state = kzalloc(sizeof(*state), GFP_NOFS);
628 atomic_set(&state->count, 1);
629 INIT_LIST_HEAD(&state->lock_states);
630 spin_lock_init(&state->state_lock);
631 seqlock_init(&state->seqlock);
636 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
638 if (state->state == fmode)
640 /* NB! List reordering - see the reclaim code for why. */
641 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
642 if (fmode & FMODE_WRITE)
643 list_move(&state->open_states, &state->owner->so_states);
645 list_move_tail(&state->open_states, &state->owner->so_states);
647 state->state = fmode;
650 static struct nfs4_state *
651 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
653 struct nfs_inode *nfsi = NFS_I(inode);
654 struct nfs4_state *state;
656 list_for_each_entry(state, &nfsi->open_states, inode_states) {
657 if (state->owner != owner)
659 if (!nfs4_valid_open_stateid(state))
661 if (atomic_inc_not_zero(&state->count))
668 nfs4_free_open_state(struct nfs4_state *state)
674 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
676 struct nfs4_state *state, *new;
677 struct nfs_inode *nfsi = NFS_I(inode);
679 spin_lock(&inode->i_lock);
680 state = __nfs4_find_state_byowner(inode, owner);
681 spin_unlock(&inode->i_lock);
684 new = nfs4_alloc_open_state();
685 spin_lock(&owner->so_lock);
686 spin_lock(&inode->i_lock);
687 state = __nfs4_find_state_byowner(inode, owner);
688 if (state == NULL && new != NULL) {
690 state->owner = owner;
691 atomic_inc(&owner->so_count);
692 list_add(&state->inode_states, &nfsi->open_states);
694 state->inode = inode;
695 spin_unlock(&inode->i_lock);
696 /* Note: The reclaim code dictates that we add stateless
697 * and read-only stateids to the end of the list */
698 list_add_tail(&state->open_states, &owner->so_states);
699 spin_unlock(&owner->so_lock);
701 spin_unlock(&inode->i_lock);
702 spin_unlock(&owner->so_lock);
704 nfs4_free_open_state(new);
710 void nfs4_put_open_state(struct nfs4_state *state)
712 struct inode *inode = state->inode;
713 struct nfs4_state_owner *owner = state->owner;
715 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
717 spin_lock(&inode->i_lock);
718 list_del(&state->inode_states);
719 list_del(&state->open_states);
720 spin_unlock(&inode->i_lock);
721 spin_unlock(&owner->so_lock);
723 nfs4_free_open_state(state);
724 nfs4_put_state_owner(owner);
728 * Close the current file.
730 static void __nfs4_close(struct nfs4_state *state,
731 fmode_t fmode, gfp_t gfp_mask, int wait)
733 struct nfs4_state_owner *owner = state->owner;
737 atomic_inc(&owner->so_count);
738 /* Protect against nfs4_find_state() */
739 spin_lock(&owner->so_lock);
740 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
747 case FMODE_READ|FMODE_WRITE:
750 newstate = FMODE_READ|FMODE_WRITE;
751 if (state->n_rdwr == 0) {
752 if (state->n_rdonly == 0) {
753 newstate &= ~FMODE_READ;
754 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
755 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
757 if (state->n_wronly == 0) {
758 newstate &= ~FMODE_WRITE;
759 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
760 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
763 clear_bit(NFS_DELEGATED_STATE, &state->flags);
765 nfs4_state_set_mode_locked(state, newstate);
766 spin_unlock(&owner->so_lock);
769 nfs4_put_open_state(state);
770 nfs4_put_state_owner(owner);
772 nfs4_do_close(state, gfp_mask, wait);
775 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
777 __nfs4_close(state, fmode, GFP_NOFS, 0);
780 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
782 __nfs4_close(state, fmode, GFP_KERNEL, 1);
786 * Search the state->lock_states for an existing lock_owner
787 * that is compatible with current->files
789 static struct nfs4_lock_state *
790 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
792 struct nfs4_lock_state *pos;
793 list_for_each_entry(pos, &state->lock_states, ls_locks) {
794 if (pos->ls_owner != fl_owner)
796 atomic_inc(&pos->ls_count);
803 * Return a compatible lock_state. If no initialized lock_state structure
804 * exists, return an uninitialized one.
807 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
809 struct nfs4_lock_state *lsp;
810 struct nfs_server *server = state->owner->so_server;
812 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
815 nfs4_init_seqid_counter(&lsp->ls_seqid);
816 atomic_set(&lsp->ls_count, 1);
817 lsp->ls_state = state;
818 lsp->ls_owner = fl_owner;
819 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
820 if (lsp->ls_seqid.owner_id < 0)
822 INIT_LIST_HEAD(&lsp->ls_locks);
829 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
831 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
832 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
837 * Return a compatible lock_state. If no initialized lock_state structure
838 * exists, return an uninitialized one.
841 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
843 struct nfs4_lock_state *lsp, *new = NULL;
846 spin_lock(&state->state_lock);
847 lsp = __nfs4_find_lock_state(state, owner);
851 list_add(&new->ls_locks, &state->lock_states);
852 set_bit(LK_STATE_IN_USE, &state->flags);
857 spin_unlock(&state->state_lock);
858 new = nfs4_alloc_lock_state(state, owner);
862 spin_unlock(&state->state_lock);
864 nfs4_free_lock_state(state->owner->so_server, new);
869 * Release reference to lock_state, and free it if we see that
870 * it is no longer in use
872 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
874 struct nfs_server *server;
875 struct nfs4_state *state;
879 state = lsp->ls_state;
880 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
882 list_del(&lsp->ls_locks);
883 if (list_empty(&state->lock_states))
884 clear_bit(LK_STATE_IN_USE, &state->flags);
885 spin_unlock(&state->state_lock);
886 server = state->owner->so_server;
887 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
888 struct nfs_client *clp = server->nfs_client;
890 clp->cl_mvops->free_lock_state(server, lsp);
892 nfs4_free_lock_state(server, lsp);
895 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
897 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
899 dst->fl_u.nfs4_fl.owner = lsp;
900 atomic_inc(&lsp->ls_count);
903 static void nfs4_fl_release_lock(struct file_lock *fl)
905 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
908 static const struct file_lock_operations nfs4_fl_lock_ops = {
909 .fl_copy_lock = nfs4_fl_copy_lock,
910 .fl_release_private = nfs4_fl_release_lock,
913 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
915 struct nfs4_lock_state *lsp;
917 if (fl->fl_ops != NULL)
919 lsp = nfs4_get_lock_state(state, fl->fl_owner);
922 fl->fl_u.nfs4_fl.owner = lsp;
923 fl->fl_ops = &nfs4_fl_lock_ops;
927 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
928 struct nfs4_state *state,
929 const struct nfs_lockowner *lockowner)
931 struct nfs4_lock_state *lsp;
936 if (lockowner == NULL)
939 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
942 fl_owner = lockowner->l_owner;
943 spin_lock(&state->state_lock);
944 lsp = __nfs4_find_lock_state(state, fl_owner);
945 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
947 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
948 nfs4_stateid_copy(dst, &lsp->ls_stateid);
951 spin_unlock(&state->state_lock);
952 nfs4_put_lock_state(lsp);
957 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
959 const nfs4_stateid *src;
964 seq = read_seqbegin(&state->seqlock);
965 if (test_bit(NFS_OPEN_STATE, &state->flags))
966 src = &state->open_stateid;
967 nfs4_stateid_copy(dst, src);
968 } while (read_seqretry(&state->seqlock, seq));
972 * Byte-range lock aware utility to initialize the stateid of read/write
975 int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
976 fmode_t fmode, const struct nfs_lockowner *lockowner)
978 int ret = nfs4_copy_lock_stateid(dst, state, lockowner);
980 /* A lost lock - don't even consider delegations */
982 /* returns true if delegation stateid found and copied */
983 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) {
988 /* nfs4_copy_delegation_stateid() didn't over-write
989 * dst, so it still has the lock stateid which we now
993 nfs4_copy_open_stateid(dst, state);
996 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1001 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1003 struct nfs_seqid *new;
1005 new = kmalloc(sizeof(*new), gfp_mask);
1007 return ERR_PTR(-ENOMEM);
1008 new->sequence = counter;
1009 INIT_LIST_HEAD(&new->list);
1014 void nfs_release_seqid(struct nfs_seqid *seqid)
1016 struct nfs_seqid_counter *sequence;
1018 if (seqid == NULL || list_empty(&seqid->list))
1020 sequence = seqid->sequence;
1021 spin_lock(&sequence->lock);
1022 list_del_init(&seqid->list);
1023 if (!list_empty(&sequence->list)) {
1024 struct nfs_seqid *next;
1026 next = list_first_entry(&sequence->list,
1027 struct nfs_seqid, list);
1028 rpc_wake_up_queued_task(&sequence->wait, next->task);
1030 spin_unlock(&sequence->lock);
1033 void nfs_free_seqid(struct nfs_seqid *seqid)
1035 nfs_release_seqid(seqid);
1040 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1041 * failed with a seqid incrementing error -
1042 * see comments nfs4.h:seqid_mutating_error()
1044 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1049 case -NFS4ERR_BAD_SEQID:
1050 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1052 pr_warn_ratelimited("NFS: v4 server returned a bad"
1053 " sequence-id error on an"
1054 " unconfirmed sequence %p!\n",
1056 case -NFS4ERR_STALE_CLIENTID:
1057 case -NFS4ERR_STALE_STATEID:
1058 case -NFS4ERR_BAD_STATEID:
1059 case -NFS4ERR_BADXDR:
1060 case -NFS4ERR_RESOURCE:
1061 case -NFS4ERR_NOFILEHANDLE:
1062 /* Non-seqid mutating errors */
1066 * Note: no locking needed as we are guaranteed to be first
1067 * on the sequence list
1069 seqid->sequence->counter++;
1072 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1074 struct nfs4_state_owner *sp;
1079 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1080 if (status == -NFS4ERR_BAD_SEQID)
1081 nfs4_drop_state_owner(sp);
1082 if (!nfs4_has_session(sp->so_server->nfs_client))
1083 nfs_increment_seqid(status, seqid);
1087 * Increment the seqid if the LOCK/LOCKU succeeded, or
1088 * failed with a seqid incrementing error -
1089 * see comments nfs4.h:seqid_mutating_error()
1091 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1094 nfs_increment_seqid(status, seqid);
1097 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1099 struct nfs_seqid_counter *sequence;
1104 sequence = seqid->sequence;
1105 spin_lock(&sequence->lock);
1107 if (list_empty(&seqid->list))
1108 list_add_tail(&seqid->list, &sequence->list);
1109 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1111 rpc_sleep_on(&sequence->wait, task, NULL);
1114 spin_unlock(&sequence->lock);
1119 static int nfs4_run_state_manager(void *);
1121 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1123 smp_mb__before_atomic();
1124 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1125 smp_mb__after_atomic();
1126 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1127 rpc_wake_up(&clp->cl_rpcwaitq);
1131 * Schedule the nfs_client asynchronous state management routine
1133 void nfs4_schedule_state_manager(struct nfs_client *clp)
1135 struct task_struct *task;
1136 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1138 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1140 __module_get(THIS_MODULE);
1141 atomic_inc(&clp->cl_count);
1143 /* The rcu_read_lock() is not strictly necessary, as the state
1144 * manager is the only thread that ever changes the rpc_xprt
1145 * after it's initialized. At this point, we're single threaded. */
1147 snprintf(buf, sizeof(buf), "%s-manager",
1148 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1150 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1152 printk(KERN_ERR "%s: kthread_run: %ld\n",
1153 __func__, PTR_ERR(task));
1154 nfs4_clear_state_manager_bit(clp);
1155 nfs_put_client(clp);
1156 module_put(THIS_MODULE);
1161 * Schedule a lease recovery attempt
1163 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1167 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1168 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1169 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1171 nfs4_schedule_state_manager(clp);
1173 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1176 * nfs4_schedule_migration_recovery - trigger migration recovery
1178 * @server: FSID that is migrating
1180 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1181 * value is returned.
1183 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1185 struct nfs_client *clp = server->nfs_client;
1187 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1188 pr_err("NFS: volatile file handles not supported (server %s)\n",
1193 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1196 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1198 (unsigned long long)server->fsid.major,
1199 (unsigned long long)server->fsid.minor,
1202 set_bit(NFS_MIG_IN_TRANSITION,
1203 &((struct nfs_server *)server)->mig_status);
1204 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1206 nfs4_schedule_state_manager(clp);
1209 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1212 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1214 * @clp: server to check for moved leases
1217 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1219 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1220 __func__, clp->cl_clientid, clp->cl_hostname);
1222 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1223 nfs4_schedule_state_manager(clp);
1225 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1227 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1233 atomic_inc(&clp->cl_count);
1234 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1235 nfs_wait_bit_killable, TASK_KILLABLE);
1238 if (clp->cl_cons_state < 0)
1239 res = clp->cl_cons_state;
1241 nfs_put_client(clp);
1245 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1250 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1251 ret = nfs4_wait_clnt_recover(clp);
1254 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1255 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1257 nfs4_schedule_state_manager(clp);
1264 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1265 * @clp: client to process
1267 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1268 * resend of the SETCLIENTID and hence re-establish the
1269 * callback channel. Then return all existing delegations.
1271 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1273 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1274 nfs_expire_all_delegations(clp);
1275 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1279 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1281 nfs40_handle_cb_pathdown(clp);
1282 nfs4_schedule_state_manager(clp);
1285 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1288 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1289 /* Don't recover state that expired before the reboot */
1290 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1291 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1294 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1295 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1299 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1301 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1302 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1303 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1304 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1308 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1310 struct nfs_client *clp = server->nfs_client;
1312 if (!nfs4_valid_open_stateid(state))
1314 nfs4_state_mark_reclaim_nograce(clp, state);
1315 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1317 nfs4_schedule_state_manager(clp);
1320 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1322 void nfs_inode_find_state_and_recover(struct inode *inode,
1323 const nfs4_stateid *stateid)
1325 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1326 struct nfs_inode *nfsi = NFS_I(inode);
1327 struct nfs_open_context *ctx;
1328 struct nfs4_state *state;
1331 spin_lock(&inode->i_lock);
1332 list_for_each_entry(ctx, &nfsi->open_files, list) {
1336 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1338 if (!nfs4_stateid_match(&state->stateid, stateid))
1340 nfs4_state_mark_reclaim_nograce(clp, state);
1343 spin_unlock(&inode->i_lock);
1345 nfs4_schedule_state_manager(clp);
1348 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1350 struct inode *inode = state->inode;
1351 struct nfs_inode *nfsi = NFS_I(inode);
1352 struct nfs_open_context *ctx;
1354 spin_lock(&inode->i_lock);
1355 list_for_each_entry(ctx, &nfsi->open_files, list) {
1356 if (ctx->state != state)
1358 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1360 spin_unlock(&inode->i_lock);
1363 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1365 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1366 nfs4_state_mark_open_context_bad(state);
1370 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1372 struct inode *inode = state->inode;
1373 struct nfs_inode *nfsi = NFS_I(inode);
1374 struct file_lock *fl;
1376 struct file_lock_context *flctx = inode->i_flctx;
1377 struct list_head *list;
1382 list = &flctx->flc_posix;
1384 /* Guard against delegation returns and new lock/unlock calls */
1385 down_write(&nfsi->rwsem);
1386 spin_lock(&flctx->flc_lock);
1388 list_for_each_entry(fl, list, fl_list) {
1389 if (nfs_file_open_context(fl->fl_file)->state != state)
1391 spin_unlock(&flctx->flc_lock);
1392 status = ops->recover_lock(state, fl);
1397 case -NFS4ERR_ADMIN_REVOKED:
1398 case -NFS4ERR_STALE_STATEID:
1399 case -NFS4ERR_BAD_STATEID:
1400 case -NFS4ERR_EXPIRED:
1401 case -NFS4ERR_NO_GRACE:
1402 case -NFS4ERR_STALE_CLIENTID:
1403 case -NFS4ERR_BADSESSION:
1404 case -NFS4ERR_BADSLOT:
1405 case -NFS4ERR_BAD_HIGH_SLOT:
1406 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1409 pr_err("NFS: %s: unhandled error %d\n",
1412 case -NFS4ERR_DENIED:
1413 case -NFS4ERR_RECLAIM_BAD:
1414 case -NFS4ERR_RECLAIM_CONFLICT:
1415 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1418 spin_lock(&flctx->flc_lock);
1420 if (list == &flctx->flc_posix) {
1421 list = &flctx->flc_flock;
1424 spin_unlock(&flctx->flc_lock);
1426 up_write(&nfsi->rwsem);
1430 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1432 struct nfs4_state *state;
1433 struct nfs4_lock_state *lock;
1436 /* Note: we rely on the sp->so_states list being ordered
1437 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1439 * This is needed to ensure that the server won't give us any
1440 * read delegations that we have to return if, say, we are
1441 * recovering after a network partition or a reboot from a
1442 * server that doesn't support a grace period.
1444 spin_lock(&sp->so_lock);
1445 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1447 list_for_each_entry(state, &sp->so_states, open_states) {
1448 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1450 if (!nfs4_valid_open_stateid(state))
1452 if (state->state == 0)
1454 atomic_inc(&state->count);
1455 spin_unlock(&sp->so_lock);
1456 status = ops->recover_open(sp, state);
1458 status = nfs4_reclaim_locks(state, ops);
1460 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1461 spin_lock(&state->state_lock);
1462 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1463 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1464 pr_warn_ratelimited("NFS: "
1466 "failed!\n", __func__);
1468 spin_unlock(&state->state_lock);
1470 nfs4_put_open_state(state);
1471 spin_lock(&sp->so_lock);
1477 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1482 /* Open state on this file cannot be recovered */
1483 nfs4_state_mark_recovery_failed(state, status);
1487 case -NFS4ERR_ADMIN_REVOKED:
1488 case -NFS4ERR_STALE_STATEID:
1489 case -NFS4ERR_BAD_STATEID:
1490 case -NFS4ERR_RECLAIM_BAD:
1491 case -NFS4ERR_RECLAIM_CONFLICT:
1492 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1494 case -NFS4ERR_EXPIRED:
1495 case -NFS4ERR_NO_GRACE:
1496 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1497 case -NFS4ERR_STALE_CLIENTID:
1498 case -NFS4ERR_BADSESSION:
1499 case -NFS4ERR_BADSLOT:
1500 case -NFS4ERR_BAD_HIGH_SLOT:
1501 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1504 nfs4_put_open_state(state);
1505 spin_lock(&sp->so_lock);
1508 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1509 spin_unlock(&sp->so_lock);
1512 nfs4_put_open_state(state);
1513 spin_lock(&sp->so_lock);
1514 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1515 spin_unlock(&sp->so_lock);
1519 static void nfs4_clear_open_state(struct nfs4_state *state)
1521 struct nfs4_lock_state *lock;
1523 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1524 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1525 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1526 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1527 spin_lock(&state->state_lock);
1528 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1529 lock->ls_seqid.flags = 0;
1530 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1532 spin_unlock(&state->state_lock);
1535 static void nfs4_reset_seqids(struct nfs_server *server,
1536 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1538 struct nfs_client *clp = server->nfs_client;
1539 struct nfs4_state_owner *sp;
1540 struct rb_node *pos;
1541 struct nfs4_state *state;
1543 spin_lock(&clp->cl_lock);
1544 for (pos = rb_first(&server->state_owners);
1546 pos = rb_next(pos)) {
1547 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1548 sp->so_seqid.flags = 0;
1549 spin_lock(&sp->so_lock);
1550 list_for_each_entry(state, &sp->so_states, open_states) {
1551 if (mark_reclaim(clp, state))
1552 nfs4_clear_open_state(state);
1554 spin_unlock(&sp->so_lock);
1556 spin_unlock(&clp->cl_lock);
1559 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1560 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1562 struct nfs_server *server;
1565 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1566 nfs4_reset_seqids(server, mark_reclaim);
1570 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1572 /* Mark all delegations for reclaim */
1573 nfs_delegation_mark_reclaim(clp);
1574 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1577 static void nfs4_reclaim_complete(struct nfs_client *clp,
1578 const struct nfs4_state_recovery_ops *ops,
1579 struct rpc_cred *cred)
1581 /* Notify the server we're done reclaiming our state */
1582 if (ops->reclaim_complete)
1583 (void)ops->reclaim_complete(clp, cred);
1586 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1588 struct nfs_client *clp = server->nfs_client;
1589 struct nfs4_state_owner *sp;
1590 struct rb_node *pos;
1591 struct nfs4_state *state;
1593 spin_lock(&clp->cl_lock);
1594 for (pos = rb_first(&server->state_owners);
1596 pos = rb_next(pos)) {
1597 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1598 spin_lock(&sp->so_lock);
1599 list_for_each_entry(state, &sp->so_states, open_states) {
1600 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1603 nfs4_state_mark_reclaim_nograce(clp, state);
1605 spin_unlock(&sp->so_lock);
1607 spin_unlock(&clp->cl_lock);
1610 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1612 struct nfs_server *server;
1614 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1618 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1619 nfs4_clear_reclaim_server(server);
1622 nfs_delegation_reap_unclaimed(clp);
1626 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1628 const struct nfs4_state_recovery_ops *ops;
1629 struct rpc_cred *cred;
1631 if (!nfs4_state_clear_reclaim_reboot(clp))
1633 ops = clp->cl_mvops->reboot_recovery_ops;
1634 cred = nfs4_get_clid_cred(clp);
1635 nfs4_reclaim_complete(clp, ops, cred);
1639 static void nfs_delegation_clear_all(struct nfs_client *clp)
1641 nfs_delegation_mark_reclaim(clp);
1642 nfs_delegation_reap_unclaimed(clp);
1645 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1647 nfs_delegation_clear_all(clp);
1648 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1651 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1656 case -NFS4ERR_CB_PATH_DOWN:
1657 nfs40_handle_cb_pathdown(clp);
1659 case -NFS4ERR_NO_GRACE:
1660 nfs4_state_end_reclaim_reboot(clp);
1662 case -NFS4ERR_STALE_CLIENTID:
1663 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1664 nfs4_state_clear_reclaim_reboot(clp);
1665 nfs4_state_start_reclaim_reboot(clp);
1667 case -NFS4ERR_EXPIRED:
1668 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1669 nfs4_state_start_reclaim_nograce(clp);
1671 case -NFS4ERR_BADSESSION:
1672 case -NFS4ERR_BADSLOT:
1673 case -NFS4ERR_BAD_HIGH_SLOT:
1674 case -NFS4ERR_DEADSESSION:
1675 case -NFS4ERR_SEQ_FALSE_RETRY:
1676 case -NFS4ERR_SEQ_MISORDERED:
1677 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1678 /* Zero session reset errors */
1680 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1681 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1684 dprintk("%s: failed to handle error %d for server %s\n",
1685 __func__, error, clp->cl_hostname);
1688 dprintk("%s: handled error %d for server %s\n", __func__, error,
1693 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1695 struct nfs4_state_owner *sp;
1696 struct nfs_server *server;
1697 struct rb_node *pos;
1702 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1703 nfs4_purge_state_owners(server);
1704 spin_lock(&clp->cl_lock);
1705 for (pos = rb_first(&server->state_owners);
1707 pos = rb_next(pos)) {
1709 struct nfs4_state_owner, so_server_node);
1710 if (!test_and_clear_bit(ops->owner_flag_bit,
1713 atomic_inc(&sp->so_count);
1714 spin_unlock(&clp->cl_lock);
1717 status = nfs4_reclaim_open_state(sp, ops);
1719 set_bit(ops->owner_flag_bit, &sp->so_flags);
1720 nfs4_put_state_owner(sp);
1721 status = nfs4_recovery_handle_error(clp, status);
1722 return (status != 0) ? status : -EAGAIN;
1725 nfs4_put_state_owner(sp);
1728 spin_unlock(&clp->cl_lock);
1734 static int nfs4_check_lease(struct nfs_client *clp)
1736 struct rpc_cred *cred;
1737 const struct nfs4_state_maintenance_ops *ops =
1738 clp->cl_mvops->state_renewal_ops;
1741 /* Is the client already known to have an expired lease? */
1742 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1744 spin_lock(&clp->cl_lock);
1745 cred = ops->get_state_renewal_cred_locked(clp);
1746 spin_unlock(&clp->cl_lock);
1748 cred = nfs4_get_clid_cred(clp);
1753 status = ops->renew_lease(clp, cred);
1755 if (status == -ETIMEDOUT) {
1756 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1760 return nfs4_recovery_handle_error(clp, status);
1763 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1764 * and for recoverable errors on EXCHANGE_ID for v4.1
1766 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1769 case -NFS4ERR_SEQ_MISORDERED:
1770 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1771 return -ESERVERFAULT;
1772 /* Lease confirmation error: retry after purging the lease */
1774 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1776 case -NFS4ERR_STALE_CLIENTID:
1777 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1778 nfs4_state_start_reclaim_reboot(clp);
1780 case -NFS4ERR_CLID_INUSE:
1781 pr_err("NFS: Server %s reports our clientid is in use\n",
1783 nfs_mark_client_ready(clp, -EPERM);
1784 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1787 case -NFS4ERR_DELAY:
1793 case -NFS4ERR_MINOR_VERS_MISMATCH:
1794 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1795 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1796 dprintk("%s: exit with error %d for server %s\n",
1797 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1798 return -EPROTONOSUPPORT;
1799 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1800 * in nfs4_exchange_id */
1802 dprintk("%s: exit with error %d for server %s\n", __func__,
1803 status, clp->cl_hostname);
1806 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1807 dprintk("%s: handled error %d for server %s\n", __func__, status,
1812 static int nfs4_establish_lease(struct nfs_client *clp)
1814 struct rpc_cred *cred;
1815 const struct nfs4_state_recovery_ops *ops =
1816 clp->cl_mvops->reboot_recovery_ops;
1819 cred = nfs4_get_clid_cred(clp);
1822 status = ops->establish_clid(clp, cred);
1826 pnfs_destroy_all_layouts(clp);
1831 * Returns zero or a negative errno. NFS4ERR values are converted
1832 * to local errno values.
1834 static int nfs4_reclaim_lease(struct nfs_client *clp)
1838 status = nfs4_establish_lease(clp);
1840 return nfs4_handle_reclaim_lease_error(clp, status);
1841 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1842 nfs4_state_start_reclaim_nograce(clp);
1843 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1844 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1845 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1846 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1850 static int nfs4_purge_lease(struct nfs_client *clp)
1854 status = nfs4_establish_lease(clp);
1856 return nfs4_handle_reclaim_lease_error(clp, status);
1857 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1858 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1859 nfs4_state_start_reclaim_nograce(clp);
1864 * Try remote migration of one FSID from a source server to a
1865 * destination server. The source server provides a list of
1866 * potential destinations.
1868 * Returns zero or a negative NFS4ERR status code.
1870 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1872 struct nfs_client *clp = server->nfs_client;
1873 struct nfs4_fs_locations *locations = NULL;
1874 struct inode *inode;
1878 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1879 (unsigned long long)server->fsid.major,
1880 (unsigned long long)server->fsid.minor,
1884 page = alloc_page(GFP_KERNEL);
1885 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1886 if (page == NULL || locations == NULL) {
1887 dprintk("<-- %s: no memory\n", __func__);
1891 inode = server->super->s_root->d_inode;
1892 result = nfs4_proc_get_locations(inode, locations, page, cred);
1894 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1899 result = -NFS4ERR_NXIO;
1900 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1901 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1906 nfs4_begin_drain_session(clp);
1908 status = nfs4_replace_transport(server, locations);
1910 dprintk("<-- %s: failed to replace transport: %d\n",
1916 dprintk("<-- %s: migration succeeded\n", __func__);
1923 pr_err("NFS: migration recovery failed (server %s)\n",
1925 set_bit(NFS_MIG_FAILED, &server->mig_status);
1931 * Returns zero or a negative NFS4ERR status code.
1933 static int nfs4_handle_migration(struct nfs_client *clp)
1935 const struct nfs4_state_maintenance_ops *ops =
1936 clp->cl_mvops->state_renewal_ops;
1937 struct nfs_server *server;
1938 struct rpc_cred *cred;
1940 dprintk("%s: migration reported on \"%s\"\n", __func__,
1943 spin_lock(&clp->cl_lock);
1944 cred = ops->get_state_renewal_cred_locked(clp);
1945 spin_unlock(&clp->cl_lock);
1947 return -NFS4ERR_NOENT;
1952 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1955 if (server->mig_gen == clp->cl_mig_gen)
1957 server->mig_gen = clp->cl_mig_gen;
1959 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
1960 &server->mig_status))
1964 status = nfs4_try_migration(server, cred);
1977 * Test each nfs_server on the clp's cl_superblocks list to see
1978 * if it's moved to another server. Stop when the server no longer
1979 * returns NFS4ERR_LEASE_MOVED.
1981 static int nfs4_handle_lease_moved(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: lease moved 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) {
2001 struct inode *inode;
2004 if (server->mig_gen == clp->cl_mig_gen)
2006 server->mig_gen = clp->cl_mig_gen;
2010 inode = server->super->s_root->d_inode;
2011 status = nfs4_proc_fsid_present(inode, cred);
2012 if (status != -NFS4ERR_MOVED)
2013 goto restart; /* wasn't this one */
2014 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2015 goto restart; /* there are more */
2026 * nfs4_discover_server_trunking - Detect server IP address trunking
2028 * @clp: nfs_client under test
2029 * @result: OUT: found nfs_client, or clp
2031 * Returns zero or a negative errno. If zero is returned,
2032 * an nfs_client pointer is planted in "result".
2034 * Note: since we are invoked in process context, and
2035 * not from inside the state manager, we cannot use
2036 * nfs4_handle_reclaim_lease_error().
2038 int nfs4_discover_server_trunking(struct nfs_client *clp,
2039 struct nfs_client **result)
2041 const struct nfs4_state_recovery_ops *ops =
2042 clp->cl_mvops->reboot_recovery_ops;
2043 struct rpc_clnt *clnt;
2044 struct rpc_cred *cred;
2047 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2049 clnt = clp->cl_rpcclient;
2052 mutex_lock(&nfs_clid_init_mutex);
2055 cred = nfs4_get_clid_cred(clp);
2059 status = ops->detect_trunking(clp, result, cred);
2065 if (clnt->cl_softrtry)
2067 case -NFS4ERR_DELAY:
2070 case -NFS4ERR_STALE_CLIENTID:
2071 dprintk("NFS: %s after status %d, retrying\n",
2076 nfs4_root_machine_cred(clp);
2079 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2081 case -NFS4ERR_CLID_INUSE:
2082 case -NFS4ERR_WRONGSEC:
2083 /* No point in retrying if we already used RPC_AUTH_UNIX */
2084 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2088 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2090 status = PTR_ERR(clnt);
2093 /* Note: this is safe because we haven't yet marked the
2094 * client as ready, so we are the only user of
2097 clnt = xchg(&clp->cl_rpcclient, clnt);
2098 rpc_shutdown_client(clnt);
2099 clnt = clp->cl_rpcclient;
2102 case -NFS4ERR_MINOR_VERS_MISMATCH:
2103 status = -EPROTONOSUPPORT;
2107 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2108 * in nfs4_exchange_id */
2109 status = -EKEYEXPIRED;
2112 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2118 mutex_unlock(&nfs_clid_init_mutex);
2119 dprintk("NFS: %s: status = %d\n", __func__, status);
2123 #ifdef CONFIG_NFS_V4_1
2124 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2126 struct nfs_client *clp = session->clp;
2130 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2132 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2133 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2135 nfs4_schedule_lease_recovery(clp);
2137 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2139 static void nfs41_ping_server(struct nfs_client *clp)
2141 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2142 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2143 nfs4_schedule_state_manager(clp);
2146 void nfs41_server_notify_target_slotid_update(struct nfs_client *clp)
2148 nfs41_ping_server(clp);
2151 void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp)
2153 nfs41_ping_server(clp);
2156 static void nfs4_reset_all_state(struct nfs_client *clp)
2158 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2159 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2160 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2161 nfs4_state_start_reclaim_nograce(clp);
2162 dprintk("%s: scheduling reset of all state for server %s!\n",
2163 __func__, clp->cl_hostname);
2164 nfs4_schedule_state_manager(clp);
2168 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2170 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2171 nfs4_state_start_reclaim_reboot(clp);
2172 dprintk("%s: server %s rebooted!\n", __func__,
2174 nfs4_schedule_state_manager(clp);
2178 static void nfs41_handle_state_revoked(struct nfs_client *clp)
2180 nfs4_reset_all_state(clp);
2181 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2184 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2186 /* This will need to handle layouts too */
2187 nfs_expire_all_delegations(clp);
2188 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2192 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2194 nfs_expire_all_delegations(clp);
2195 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
2196 nfs4_schedule_state_manager(clp);
2197 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2201 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2203 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2204 &clp->cl_state) == 0)
2205 nfs4_schedule_state_manager(clp);
2208 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
2213 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2214 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2216 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2217 nfs41_handle_server_reboot(clp);
2218 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
2219 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2220 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2221 nfs41_handle_state_revoked(clp);
2222 if (flags & SEQ4_STATUS_LEASE_MOVED)
2223 nfs4_schedule_lease_moved_recovery(clp);
2224 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2225 nfs41_handle_recallable_state_revoked(clp);
2226 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2227 nfs41_handle_backchannel_fault(clp);
2228 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2229 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2230 nfs41_handle_cb_path_down(clp);
2233 static int nfs4_reset_session(struct nfs_client *clp)
2235 struct rpc_cred *cred;
2238 if (!nfs4_has_session(clp))
2240 nfs4_begin_drain_session(clp);
2241 cred = nfs4_get_clid_cred(clp);
2242 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2245 case -NFS4ERR_BADSESSION:
2246 case -NFS4ERR_DEADSESSION:
2248 case -NFS4ERR_BACK_CHAN_BUSY:
2249 case -NFS4ERR_DELAY:
2250 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2255 status = nfs4_recovery_handle_error(clp, status);
2259 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2260 status = nfs4_proc_create_session(clp, cred);
2262 dprintk("%s: session reset failed with status %d for server %s!\n",
2263 __func__, status, clp->cl_hostname);
2264 status = nfs4_handle_reclaim_lease_error(clp, status);
2267 nfs41_finish_session_reset(clp);
2268 dprintk("%s: session reset was successful for server %s!\n",
2269 __func__, clp->cl_hostname);
2276 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2278 struct rpc_cred *cred;
2281 if (!nfs4_has_session(clp))
2283 nfs4_begin_drain_session(clp);
2284 cred = nfs4_get_clid_cred(clp);
2285 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2288 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2291 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2292 __func__, clp->cl_hostname);
2294 case -NFS4ERR_DELAY:
2296 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2299 return nfs4_recovery_handle_error(clp, ret);
2303 #else /* CONFIG_NFS_V4_1 */
2304 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2306 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2310 #endif /* CONFIG_NFS_V4_1 */
2312 static void nfs4_state_manager(struct nfs_client *clp)
2315 const char *section = "", *section_sep = "";
2317 /* Ensure exclusive access to NFSv4 state */
2319 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2320 section = "purge state";
2321 status = nfs4_purge_lease(clp);
2327 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2328 section = "lease expired";
2329 /* We're going to have to re-establish a clientid */
2330 status = nfs4_reclaim_lease(clp);
2336 /* Initialize or reset the session */
2337 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2338 section = "reset session";
2339 status = nfs4_reset_session(clp);
2340 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2346 /* Send BIND_CONN_TO_SESSION */
2347 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2349 section = "bind conn to session";
2350 status = nfs4_bind_conn_to_session(clp);
2356 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2357 section = "check lease";
2358 status = nfs4_check_lease(clp);
2364 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2365 section = "migration";
2366 status = nfs4_handle_migration(clp);
2371 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2372 section = "lease moved";
2373 status = nfs4_handle_lease_moved(clp);
2378 /* First recover reboot state... */
2379 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2380 section = "reclaim reboot";
2381 status = nfs4_do_reclaim(clp,
2382 clp->cl_mvops->reboot_recovery_ops);
2383 if (status == -EAGAIN)
2387 nfs4_state_end_reclaim_reboot(clp);
2390 /* Now recover expired state... */
2391 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2392 section = "reclaim nograce";
2393 status = nfs4_do_reclaim(clp,
2394 clp->cl_mvops->nograce_recovery_ops);
2395 if (status == -EAGAIN)
2401 nfs4_end_drain_session(clp);
2402 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2403 nfs_client_return_marked_delegations(clp);
2407 nfs4_clear_state_manager_bit(clp);
2408 /* Did we race with an attempt to give us more work? */
2409 if (clp->cl_state == 0)
2411 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2413 } while (atomic_read(&clp->cl_count) > 1);
2416 if (strlen(section))
2418 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2419 " with error %d\n", section_sep, section,
2420 clp->cl_hostname, -status);
2422 nfs4_end_drain_session(clp);
2423 nfs4_clear_state_manager_bit(clp);
2426 static int nfs4_run_state_manager(void *ptr)
2428 struct nfs_client *clp = ptr;
2430 allow_signal(SIGKILL);
2431 nfs4_state_manager(clp);
2432 nfs_put_client(clp);
2433 module_put_and_exit(0);