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 new->sequence = counter;
1008 INIT_LIST_HEAD(&new->list);
1014 void nfs_release_seqid(struct nfs_seqid *seqid)
1016 struct nfs_seqid_counter *sequence;
1018 if (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 = container_of(seqid->sequence,
1075 struct nfs4_state_owner, so_seqid);
1076 struct nfs_server *server = sp->so_server;
1078 if (status == -NFS4ERR_BAD_SEQID)
1079 nfs4_drop_state_owner(sp);
1080 if (!nfs4_has_session(server->nfs_client))
1081 nfs_increment_seqid(status, seqid);
1085 * Increment the seqid if the LOCK/LOCKU succeeded, or
1086 * failed with a seqid incrementing error -
1087 * see comments nfs4.h:seqid_mutating_error()
1089 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1091 nfs_increment_seqid(status, seqid);
1094 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1096 struct nfs_seqid_counter *sequence = seqid->sequence;
1099 spin_lock(&sequence->lock);
1101 if (list_empty(&seqid->list))
1102 list_add_tail(&seqid->list, &sequence->list);
1103 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1105 rpc_sleep_on(&sequence->wait, task, NULL);
1108 spin_unlock(&sequence->lock);
1112 static int nfs4_run_state_manager(void *);
1114 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1116 smp_mb__before_atomic();
1117 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1118 smp_mb__after_atomic();
1119 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1120 rpc_wake_up(&clp->cl_rpcwaitq);
1124 * Schedule the nfs_client asynchronous state management routine
1126 void nfs4_schedule_state_manager(struct nfs_client *clp)
1128 struct task_struct *task;
1129 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1131 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1133 __module_get(THIS_MODULE);
1134 atomic_inc(&clp->cl_count);
1136 /* The rcu_read_lock() is not strictly necessary, as the state
1137 * manager is the only thread that ever changes the rpc_xprt
1138 * after it's initialized. At this point, we're single threaded. */
1140 snprintf(buf, sizeof(buf), "%s-manager",
1141 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1143 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1145 printk(KERN_ERR "%s: kthread_run: %ld\n",
1146 __func__, PTR_ERR(task));
1147 nfs4_clear_state_manager_bit(clp);
1148 nfs_put_client(clp);
1149 module_put(THIS_MODULE);
1154 * Schedule a lease recovery attempt
1156 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1160 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1161 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1162 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1164 nfs4_schedule_state_manager(clp);
1166 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1169 * nfs4_schedule_migration_recovery - trigger migration recovery
1171 * @server: FSID that is migrating
1173 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1174 * value is returned.
1176 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1178 struct nfs_client *clp = server->nfs_client;
1180 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1181 pr_err("NFS: volatile file handles not supported (server %s)\n",
1186 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1189 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1191 (unsigned long long)server->fsid.major,
1192 (unsigned long long)server->fsid.minor,
1195 set_bit(NFS_MIG_IN_TRANSITION,
1196 &((struct nfs_server *)server)->mig_status);
1197 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1199 nfs4_schedule_state_manager(clp);
1202 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1205 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1207 * @clp: server to check for moved leases
1210 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1212 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1213 __func__, clp->cl_clientid, clp->cl_hostname);
1215 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1216 nfs4_schedule_state_manager(clp);
1218 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1220 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1226 atomic_inc(&clp->cl_count);
1227 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1228 nfs_wait_bit_killable, TASK_KILLABLE);
1231 if (clp->cl_cons_state < 0)
1232 res = clp->cl_cons_state;
1234 nfs_put_client(clp);
1238 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1243 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1244 ret = nfs4_wait_clnt_recover(clp);
1247 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1248 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1250 nfs4_schedule_state_manager(clp);
1257 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1258 * @clp: client to process
1260 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1261 * resend of the SETCLIENTID and hence re-establish the
1262 * callback channel. Then return all existing delegations.
1264 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1266 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1267 nfs_expire_all_delegations(clp);
1268 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1272 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1274 nfs40_handle_cb_pathdown(clp);
1275 nfs4_schedule_state_manager(clp);
1278 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1281 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1282 /* Don't recover state that expired before the reboot */
1283 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1284 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1287 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1288 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1292 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1294 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1295 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1296 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1297 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1301 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1303 struct nfs_client *clp = server->nfs_client;
1305 if (!nfs4_valid_open_stateid(state))
1307 nfs4_state_mark_reclaim_nograce(clp, state);
1308 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1310 nfs4_schedule_state_manager(clp);
1313 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1315 void nfs_inode_find_state_and_recover(struct inode *inode,
1316 const nfs4_stateid *stateid)
1318 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1319 struct nfs_inode *nfsi = NFS_I(inode);
1320 struct nfs_open_context *ctx;
1321 struct nfs4_state *state;
1324 spin_lock(&inode->i_lock);
1325 list_for_each_entry(ctx, &nfsi->open_files, list) {
1329 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1331 if (!nfs4_stateid_match(&state->stateid, stateid))
1333 nfs4_state_mark_reclaim_nograce(clp, state);
1336 spin_unlock(&inode->i_lock);
1338 nfs4_schedule_state_manager(clp);
1341 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1343 struct inode *inode = state->inode;
1344 struct nfs_inode *nfsi = NFS_I(inode);
1345 struct nfs_open_context *ctx;
1347 spin_lock(&inode->i_lock);
1348 list_for_each_entry(ctx, &nfsi->open_files, list) {
1349 if (ctx->state != state)
1351 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1353 spin_unlock(&inode->i_lock);
1356 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1358 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1359 nfs4_state_mark_open_context_bad(state);
1363 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1365 struct inode *inode = state->inode;
1366 struct nfs_inode *nfsi = NFS_I(inode);
1367 struct file_lock *fl;
1369 struct file_lock_context *flctx = inode->i_flctx;
1370 struct list_head *list;
1375 list = &flctx->flc_posix;
1377 /* Guard against delegation returns and new lock/unlock calls */
1378 down_write(&nfsi->rwsem);
1379 spin_lock(&flctx->flc_lock);
1381 list_for_each_entry(fl, list, fl_list) {
1382 if (nfs_file_open_context(fl->fl_file)->state != state)
1384 spin_unlock(&flctx->flc_lock);
1385 status = ops->recover_lock(state, fl);
1390 case -NFS4ERR_ADMIN_REVOKED:
1391 case -NFS4ERR_STALE_STATEID:
1392 case -NFS4ERR_BAD_STATEID:
1393 case -NFS4ERR_EXPIRED:
1394 case -NFS4ERR_NO_GRACE:
1395 case -NFS4ERR_STALE_CLIENTID:
1396 case -NFS4ERR_BADSESSION:
1397 case -NFS4ERR_BADSLOT:
1398 case -NFS4ERR_BAD_HIGH_SLOT:
1399 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1402 pr_err("NFS: %s: unhandled error %d\n",
1405 case -NFS4ERR_DENIED:
1406 case -NFS4ERR_RECLAIM_BAD:
1407 case -NFS4ERR_RECLAIM_CONFLICT:
1408 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1411 spin_lock(&flctx->flc_lock);
1413 if (list == &flctx->flc_posix) {
1414 list = &flctx->flc_flock;
1417 spin_unlock(&flctx->flc_lock);
1419 up_write(&nfsi->rwsem);
1423 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1425 struct nfs4_state *state;
1426 struct nfs4_lock_state *lock;
1429 /* Note: we rely on the sp->so_states list being ordered
1430 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1432 * This is needed to ensure that the server won't give us any
1433 * read delegations that we have to return if, say, we are
1434 * recovering after a network partition or a reboot from a
1435 * server that doesn't support a grace period.
1437 spin_lock(&sp->so_lock);
1438 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1440 list_for_each_entry(state, &sp->so_states, open_states) {
1441 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1443 if (!nfs4_valid_open_stateid(state))
1445 if (state->state == 0)
1447 atomic_inc(&state->count);
1448 spin_unlock(&sp->so_lock);
1449 status = ops->recover_open(sp, state);
1451 status = nfs4_reclaim_locks(state, ops);
1453 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1454 spin_lock(&state->state_lock);
1455 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1456 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1457 pr_warn_ratelimited("NFS: "
1459 "failed!\n", __func__);
1461 spin_unlock(&state->state_lock);
1463 nfs4_put_open_state(state);
1464 spin_lock(&sp->so_lock);
1470 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1475 /* Open state on this file cannot be recovered */
1476 nfs4_state_mark_recovery_failed(state, status);
1480 case -NFS4ERR_ADMIN_REVOKED:
1481 case -NFS4ERR_STALE_STATEID:
1482 case -NFS4ERR_BAD_STATEID:
1483 case -NFS4ERR_RECLAIM_BAD:
1484 case -NFS4ERR_RECLAIM_CONFLICT:
1485 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1487 case -NFS4ERR_EXPIRED:
1488 case -NFS4ERR_NO_GRACE:
1489 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1490 case -NFS4ERR_STALE_CLIENTID:
1491 case -NFS4ERR_BADSESSION:
1492 case -NFS4ERR_BADSLOT:
1493 case -NFS4ERR_BAD_HIGH_SLOT:
1494 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1497 nfs4_put_open_state(state);
1498 spin_lock(&sp->so_lock);
1501 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1502 spin_unlock(&sp->so_lock);
1505 nfs4_put_open_state(state);
1506 spin_lock(&sp->so_lock);
1507 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1508 spin_unlock(&sp->so_lock);
1512 static void nfs4_clear_open_state(struct nfs4_state *state)
1514 struct nfs4_lock_state *lock;
1516 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1517 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1518 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1519 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1520 spin_lock(&state->state_lock);
1521 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1522 lock->ls_seqid.flags = 0;
1523 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1525 spin_unlock(&state->state_lock);
1528 static void nfs4_reset_seqids(struct nfs_server *server,
1529 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1531 struct nfs_client *clp = server->nfs_client;
1532 struct nfs4_state_owner *sp;
1533 struct rb_node *pos;
1534 struct nfs4_state *state;
1536 spin_lock(&clp->cl_lock);
1537 for (pos = rb_first(&server->state_owners);
1539 pos = rb_next(pos)) {
1540 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1541 sp->so_seqid.flags = 0;
1542 spin_lock(&sp->so_lock);
1543 list_for_each_entry(state, &sp->so_states, open_states) {
1544 if (mark_reclaim(clp, state))
1545 nfs4_clear_open_state(state);
1547 spin_unlock(&sp->so_lock);
1549 spin_unlock(&clp->cl_lock);
1552 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1553 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1555 struct nfs_server *server;
1558 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1559 nfs4_reset_seqids(server, mark_reclaim);
1563 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1565 /* Mark all delegations for reclaim */
1566 nfs_delegation_mark_reclaim(clp);
1567 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1570 static void nfs4_reclaim_complete(struct nfs_client *clp,
1571 const struct nfs4_state_recovery_ops *ops,
1572 struct rpc_cred *cred)
1574 /* Notify the server we're done reclaiming our state */
1575 if (ops->reclaim_complete)
1576 (void)ops->reclaim_complete(clp, cred);
1579 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1581 struct nfs_client *clp = server->nfs_client;
1582 struct nfs4_state_owner *sp;
1583 struct rb_node *pos;
1584 struct nfs4_state *state;
1586 spin_lock(&clp->cl_lock);
1587 for (pos = rb_first(&server->state_owners);
1589 pos = rb_next(pos)) {
1590 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1591 spin_lock(&sp->so_lock);
1592 list_for_each_entry(state, &sp->so_states, open_states) {
1593 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1596 nfs4_state_mark_reclaim_nograce(clp, state);
1598 spin_unlock(&sp->so_lock);
1600 spin_unlock(&clp->cl_lock);
1603 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1605 struct nfs_server *server;
1607 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1611 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1612 nfs4_clear_reclaim_server(server);
1615 nfs_delegation_reap_unclaimed(clp);
1619 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1621 const struct nfs4_state_recovery_ops *ops;
1622 struct rpc_cred *cred;
1624 if (!nfs4_state_clear_reclaim_reboot(clp))
1626 ops = clp->cl_mvops->reboot_recovery_ops;
1627 cred = nfs4_get_clid_cred(clp);
1628 nfs4_reclaim_complete(clp, ops, cred);
1632 static void nfs_delegation_clear_all(struct nfs_client *clp)
1634 nfs_delegation_mark_reclaim(clp);
1635 nfs_delegation_reap_unclaimed(clp);
1638 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1640 nfs_delegation_clear_all(clp);
1641 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1644 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1649 case -NFS4ERR_CB_PATH_DOWN:
1650 nfs40_handle_cb_pathdown(clp);
1652 case -NFS4ERR_NO_GRACE:
1653 nfs4_state_end_reclaim_reboot(clp);
1655 case -NFS4ERR_STALE_CLIENTID:
1656 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1657 nfs4_state_clear_reclaim_reboot(clp);
1658 nfs4_state_start_reclaim_reboot(clp);
1660 case -NFS4ERR_EXPIRED:
1661 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1662 nfs4_state_start_reclaim_nograce(clp);
1664 case -NFS4ERR_BADSESSION:
1665 case -NFS4ERR_BADSLOT:
1666 case -NFS4ERR_BAD_HIGH_SLOT:
1667 case -NFS4ERR_DEADSESSION:
1668 case -NFS4ERR_SEQ_FALSE_RETRY:
1669 case -NFS4ERR_SEQ_MISORDERED:
1670 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1671 /* Zero session reset errors */
1673 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1674 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1677 dprintk("%s: failed to handle error %d for server %s\n",
1678 __func__, error, clp->cl_hostname);
1681 dprintk("%s: handled error %d for server %s\n", __func__, error,
1686 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1688 struct nfs4_state_owner *sp;
1689 struct nfs_server *server;
1690 struct rb_node *pos;
1695 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1696 nfs4_purge_state_owners(server);
1697 spin_lock(&clp->cl_lock);
1698 for (pos = rb_first(&server->state_owners);
1700 pos = rb_next(pos)) {
1702 struct nfs4_state_owner, so_server_node);
1703 if (!test_and_clear_bit(ops->owner_flag_bit,
1706 atomic_inc(&sp->so_count);
1707 spin_unlock(&clp->cl_lock);
1710 status = nfs4_reclaim_open_state(sp, ops);
1712 set_bit(ops->owner_flag_bit, &sp->so_flags);
1713 nfs4_put_state_owner(sp);
1714 status = nfs4_recovery_handle_error(clp, status);
1715 return (status != 0) ? status : -EAGAIN;
1718 nfs4_put_state_owner(sp);
1721 spin_unlock(&clp->cl_lock);
1727 static int nfs4_check_lease(struct nfs_client *clp)
1729 struct rpc_cred *cred;
1730 const struct nfs4_state_maintenance_ops *ops =
1731 clp->cl_mvops->state_renewal_ops;
1734 /* Is the client already known to have an expired lease? */
1735 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1737 spin_lock(&clp->cl_lock);
1738 cred = ops->get_state_renewal_cred_locked(clp);
1739 spin_unlock(&clp->cl_lock);
1741 cred = nfs4_get_clid_cred(clp);
1746 status = ops->renew_lease(clp, cred);
1748 if (status == -ETIMEDOUT) {
1749 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1753 return nfs4_recovery_handle_error(clp, status);
1756 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1757 * and for recoverable errors on EXCHANGE_ID for v4.1
1759 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1762 case -NFS4ERR_SEQ_MISORDERED:
1763 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1764 return -ESERVERFAULT;
1765 /* Lease confirmation error: retry after purging the lease */
1767 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1769 case -NFS4ERR_STALE_CLIENTID:
1770 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1771 nfs4_state_start_reclaim_reboot(clp);
1773 case -NFS4ERR_CLID_INUSE:
1774 pr_err("NFS: Server %s reports our clientid is in use\n",
1776 nfs_mark_client_ready(clp, -EPERM);
1777 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1780 case -NFS4ERR_DELAY:
1786 case -NFS4ERR_MINOR_VERS_MISMATCH:
1787 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1788 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1789 dprintk("%s: exit with error %d for server %s\n",
1790 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1791 return -EPROTONOSUPPORT;
1792 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1793 * in nfs4_exchange_id */
1795 dprintk("%s: exit with error %d for server %s\n", __func__,
1796 status, clp->cl_hostname);
1799 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1800 dprintk("%s: handled error %d for server %s\n", __func__, status,
1805 static int nfs4_establish_lease(struct nfs_client *clp)
1807 struct rpc_cred *cred;
1808 const struct nfs4_state_recovery_ops *ops =
1809 clp->cl_mvops->reboot_recovery_ops;
1812 cred = nfs4_get_clid_cred(clp);
1815 status = ops->establish_clid(clp, cred);
1819 pnfs_destroy_all_layouts(clp);
1824 * Returns zero or a negative errno. NFS4ERR values are converted
1825 * to local errno values.
1827 static int nfs4_reclaim_lease(struct nfs_client *clp)
1831 status = nfs4_establish_lease(clp);
1833 return nfs4_handle_reclaim_lease_error(clp, status);
1834 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1835 nfs4_state_start_reclaim_nograce(clp);
1836 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1837 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1838 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1839 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1843 static int nfs4_purge_lease(struct nfs_client *clp)
1847 status = nfs4_establish_lease(clp);
1849 return nfs4_handle_reclaim_lease_error(clp, status);
1850 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1851 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1852 nfs4_state_start_reclaim_nograce(clp);
1857 * Try remote migration of one FSID from a source server to a
1858 * destination server. The source server provides a list of
1859 * potential destinations.
1861 * Returns zero or a negative NFS4ERR status code.
1863 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1865 struct nfs_client *clp = server->nfs_client;
1866 struct nfs4_fs_locations *locations = NULL;
1867 struct inode *inode;
1871 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1872 (unsigned long long)server->fsid.major,
1873 (unsigned long long)server->fsid.minor,
1877 page = alloc_page(GFP_KERNEL);
1878 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1879 if (page == NULL || locations == NULL) {
1880 dprintk("<-- %s: no memory\n", __func__);
1884 inode = server->super->s_root->d_inode;
1885 result = nfs4_proc_get_locations(inode, locations, page, cred);
1887 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1892 result = -NFS4ERR_NXIO;
1893 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1894 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1899 nfs4_begin_drain_session(clp);
1901 status = nfs4_replace_transport(server, locations);
1903 dprintk("<-- %s: failed to replace transport: %d\n",
1909 dprintk("<-- %s: migration succeeded\n", __func__);
1916 pr_err("NFS: migration recovery failed (server %s)\n",
1918 set_bit(NFS_MIG_FAILED, &server->mig_status);
1924 * Returns zero or a negative NFS4ERR status code.
1926 static int nfs4_handle_migration(struct nfs_client *clp)
1928 const struct nfs4_state_maintenance_ops *ops =
1929 clp->cl_mvops->state_renewal_ops;
1930 struct nfs_server *server;
1931 struct rpc_cred *cred;
1933 dprintk("%s: migration reported on \"%s\"\n", __func__,
1936 spin_lock(&clp->cl_lock);
1937 cred = ops->get_state_renewal_cred_locked(clp);
1938 spin_unlock(&clp->cl_lock);
1940 return -NFS4ERR_NOENT;
1945 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1948 if (server->mig_gen == clp->cl_mig_gen)
1950 server->mig_gen = clp->cl_mig_gen;
1952 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
1953 &server->mig_status))
1957 status = nfs4_try_migration(server, cred);
1970 * Test each nfs_server on the clp's cl_superblocks list to see
1971 * if it's moved to another server. Stop when the server no longer
1972 * returns NFS4ERR_LEASE_MOVED.
1974 static int nfs4_handle_lease_moved(struct nfs_client *clp)
1976 const struct nfs4_state_maintenance_ops *ops =
1977 clp->cl_mvops->state_renewal_ops;
1978 struct nfs_server *server;
1979 struct rpc_cred *cred;
1981 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
1984 spin_lock(&clp->cl_lock);
1985 cred = ops->get_state_renewal_cred_locked(clp);
1986 spin_unlock(&clp->cl_lock);
1988 return -NFS4ERR_NOENT;
1993 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1994 struct inode *inode;
1997 if (server->mig_gen == clp->cl_mig_gen)
1999 server->mig_gen = clp->cl_mig_gen;
2003 inode = server->super->s_root->d_inode;
2004 status = nfs4_proc_fsid_present(inode, cred);
2005 if (status != -NFS4ERR_MOVED)
2006 goto restart; /* wasn't this one */
2007 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2008 goto restart; /* there are more */
2019 * nfs4_discover_server_trunking - Detect server IP address trunking
2021 * @clp: nfs_client under test
2022 * @result: OUT: found nfs_client, or clp
2024 * Returns zero or a negative errno. If zero is returned,
2025 * an nfs_client pointer is planted in "result".
2027 * Note: since we are invoked in process context, and
2028 * not from inside the state manager, we cannot use
2029 * nfs4_handle_reclaim_lease_error().
2031 int nfs4_discover_server_trunking(struct nfs_client *clp,
2032 struct nfs_client **result)
2034 const struct nfs4_state_recovery_ops *ops =
2035 clp->cl_mvops->reboot_recovery_ops;
2036 struct rpc_clnt *clnt;
2037 struct rpc_cred *cred;
2040 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2042 clnt = clp->cl_rpcclient;
2045 mutex_lock(&nfs_clid_init_mutex);
2048 cred = nfs4_get_clid_cred(clp);
2052 status = ops->detect_trunking(clp, result, cred);
2058 if (clnt->cl_softrtry)
2060 case -NFS4ERR_DELAY:
2063 case -NFS4ERR_STALE_CLIENTID:
2064 dprintk("NFS: %s after status %d, retrying\n",
2069 nfs4_root_machine_cred(clp);
2072 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2074 case -NFS4ERR_CLID_INUSE:
2075 case -NFS4ERR_WRONGSEC:
2076 /* No point in retrying if we already used RPC_AUTH_UNIX */
2077 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2081 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2083 status = PTR_ERR(clnt);
2086 /* Note: this is safe because we haven't yet marked the
2087 * client as ready, so we are the only user of
2090 clnt = xchg(&clp->cl_rpcclient, clnt);
2091 rpc_shutdown_client(clnt);
2092 clnt = clp->cl_rpcclient;
2095 case -NFS4ERR_MINOR_VERS_MISMATCH:
2096 status = -EPROTONOSUPPORT;
2100 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2101 * in nfs4_exchange_id */
2102 status = -EKEYEXPIRED;
2105 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2111 mutex_unlock(&nfs_clid_init_mutex);
2112 dprintk("NFS: %s: status = %d\n", __func__, status);
2116 #ifdef CONFIG_NFS_V4_1
2117 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2119 struct nfs_client *clp = session->clp;
2123 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2125 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2126 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2128 nfs4_schedule_lease_recovery(clp);
2130 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2132 static void nfs41_ping_server(struct nfs_client *clp)
2134 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2135 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2136 nfs4_schedule_state_manager(clp);
2139 void nfs41_server_notify_target_slotid_update(struct nfs_client *clp)
2141 nfs41_ping_server(clp);
2144 void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp)
2146 nfs41_ping_server(clp);
2149 static void nfs4_reset_all_state(struct nfs_client *clp)
2151 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2152 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2153 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2154 nfs4_state_start_reclaim_nograce(clp);
2155 dprintk("%s: scheduling reset of all state for server %s!\n",
2156 __func__, clp->cl_hostname);
2157 nfs4_schedule_state_manager(clp);
2161 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2163 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2164 nfs4_state_start_reclaim_reboot(clp);
2165 dprintk("%s: server %s rebooted!\n", __func__,
2167 nfs4_schedule_state_manager(clp);
2171 static void nfs41_handle_state_revoked(struct nfs_client *clp)
2173 nfs4_reset_all_state(clp);
2174 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2177 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2179 /* This will need to handle layouts too */
2180 nfs_expire_all_delegations(clp);
2181 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2185 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2187 nfs_expire_all_delegations(clp);
2188 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
2189 nfs4_schedule_state_manager(clp);
2190 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2194 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2196 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2197 &clp->cl_state) == 0)
2198 nfs4_schedule_state_manager(clp);
2201 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
2206 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2207 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2209 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2210 nfs41_handle_server_reboot(clp);
2211 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
2212 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2213 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2214 nfs41_handle_state_revoked(clp);
2215 if (flags & SEQ4_STATUS_LEASE_MOVED)
2216 nfs4_schedule_lease_moved_recovery(clp);
2217 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2218 nfs41_handle_recallable_state_revoked(clp);
2219 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2220 nfs41_handle_backchannel_fault(clp);
2221 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2222 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2223 nfs41_handle_cb_path_down(clp);
2226 static int nfs4_reset_session(struct nfs_client *clp)
2228 struct rpc_cred *cred;
2231 if (!nfs4_has_session(clp))
2233 nfs4_begin_drain_session(clp);
2234 cred = nfs4_get_clid_cred(clp);
2235 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2238 case -NFS4ERR_BADSESSION:
2239 case -NFS4ERR_DEADSESSION:
2241 case -NFS4ERR_BACK_CHAN_BUSY:
2242 case -NFS4ERR_DELAY:
2243 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2248 status = nfs4_recovery_handle_error(clp, status);
2252 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2253 status = nfs4_proc_create_session(clp, cred);
2255 dprintk("%s: session reset failed with status %d for server %s!\n",
2256 __func__, status, clp->cl_hostname);
2257 status = nfs4_handle_reclaim_lease_error(clp, status);
2260 nfs41_finish_session_reset(clp);
2261 dprintk("%s: session reset was successful for server %s!\n",
2262 __func__, clp->cl_hostname);
2269 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2271 struct rpc_cred *cred;
2274 if (!nfs4_has_session(clp))
2276 nfs4_begin_drain_session(clp);
2277 cred = nfs4_get_clid_cred(clp);
2278 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2281 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2284 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2285 __func__, clp->cl_hostname);
2287 case -NFS4ERR_DELAY:
2289 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2292 return nfs4_recovery_handle_error(clp, ret);
2296 #else /* CONFIG_NFS_V4_1 */
2297 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2299 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2303 #endif /* CONFIG_NFS_V4_1 */
2305 static void nfs4_state_manager(struct nfs_client *clp)
2308 const char *section = "", *section_sep = "";
2310 /* Ensure exclusive access to NFSv4 state */
2312 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2313 section = "purge state";
2314 status = nfs4_purge_lease(clp);
2320 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2321 section = "lease expired";
2322 /* We're going to have to re-establish a clientid */
2323 status = nfs4_reclaim_lease(clp);
2329 /* Initialize or reset the session */
2330 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2331 section = "reset session";
2332 status = nfs4_reset_session(clp);
2333 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2339 /* Send BIND_CONN_TO_SESSION */
2340 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2342 section = "bind conn to session";
2343 status = nfs4_bind_conn_to_session(clp);
2349 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2350 section = "check lease";
2351 status = nfs4_check_lease(clp);
2357 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2358 section = "migration";
2359 status = nfs4_handle_migration(clp);
2364 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2365 section = "lease moved";
2366 status = nfs4_handle_lease_moved(clp);
2371 /* First recover reboot state... */
2372 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2373 section = "reclaim reboot";
2374 status = nfs4_do_reclaim(clp,
2375 clp->cl_mvops->reboot_recovery_ops);
2376 if (status == -EAGAIN)
2380 nfs4_state_end_reclaim_reboot(clp);
2383 /* Now recover expired state... */
2384 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2385 section = "reclaim nograce";
2386 status = nfs4_do_reclaim(clp,
2387 clp->cl_mvops->nograce_recovery_ops);
2388 if (status == -EAGAIN)
2394 nfs4_end_drain_session(clp);
2395 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2396 nfs_client_return_marked_delegations(clp);
2400 nfs4_clear_state_manager_bit(clp);
2401 /* Did we race with an attempt to give us more work? */
2402 if (clp->cl_state == 0)
2404 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2406 } while (atomic_read(&clp->cl_count) > 1);
2409 if (strlen(section))
2411 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2412 " with error %d\n", section_sep, section,
2413 clp->cl_hostname, -status);
2415 nfs4_end_drain_session(clp);
2416 nfs4_clear_state_manager_bit(clp);
2419 static int nfs4_run_state_manager(void *ptr)
2421 struct nfs_client *clp = ptr;
2423 allow_signal(SIGKILL);
2424 nfs4_state_manager(clp);
2425 nfs_put_client(clp);
2426 module_put_and_exit(0);