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 free_lock_state_work(struct work_struct *work)
805 struct nfs4_lock_state *lsp = container_of(work,
806 struct nfs4_lock_state, ls_release);
807 struct nfs4_state *state = lsp->ls_state;
808 struct nfs_server *server = state->owner->so_server;
809 struct nfs_client *clp = server->nfs_client;
811 clp->cl_mvops->free_lock_state(server, lsp);
815 * Return a compatible lock_state. If no initialized lock_state structure
816 * exists, return an uninitialized one.
819 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
821 struct nfs4_lock_state *lsp;
822 struct nfs_server *server = state->owner->so_server;
824 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
827 nfs4_init_seqid_counter(&lsp->ls_seqid);
828 atomic_set(&lsp->ls_count, 1);
829 lsp->ls_state = state;
830 lsp->ls_owner = fl_owner;
831 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
832 if (lsp->ls_seqid.owner_id < 0)
834 INIT_LIST_HEAD(&lsp->ls_locks);
835 INIT_WORK(&lsp->ls_release, free_lock_state_work);
842 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
844 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
845 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
850 * Return a compatible lock_state. If no initialized lock_state structure
851 * exists, return an uninitialized one.
854 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
856 struct nfs4_lock_state *lsp, *new = NULL;
859 spin_lock(&state->state_lock);
860 lsp = __nfs4_find_lock_state(state, owner);
864 list_add(&new->ls_locks, &state->lock_states);
865 set_bit(LK_STATE_IN_USE, &state->flags);
870 spin_unlock(&state->state_lock);
871 new = nfs4_alloc_lock_state(state, owner);
875 spin_unlock(&state->state_lock);
877 nfs4_free_lock_state(state->owner->so_server, new);
882 * Release reference to lock_state, and free it if we see that
883 * it is no longer in use
885 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
887 struct nfs_server *server;
888 struct nfs4_state *state;
892 state = lsp->ls_state;
893 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
895 list_del(&lsp->ls_locks);
896 if (list_empty(&state->lock_states))
897 clear_bit(LK_STATE_IN_USE, &state->flags);
898 spin_unlock(&state->state_lock);
899 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags))
900 queue_work(nfsiod_workqueue, &lsp->ls_release);
902 server = state->owner->so_server;
903 nfs4_free_lock_state(server, lsp);
907 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
909 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
911 dst->fl_u.nfs4_fl.owner = lsp;
912 atomic_inc(&lsp->ls_count);
915 static void nfs4_fl_release_lock(struct file_lock *fl)
917 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
920 static const struct file_lock_operations nfs4_fl_lock_ops = {
921 .fl_copy_lock = nfs4_fl_copy_lock,
922 .fl_release_private = nfs4_fl_release_lock,
925 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
927 struct nfs4_lock_state *lsp;
929 if (fl->fl_ops != NULL)
931 lsp = nfs4_get_lock_state(state, fl->fl_owner);
934 fl->fl_u.nfs4_fl.owner = lsp;
935 fl->fl_ops = &nfs4_fl_lock_ops;
939 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
940 struct nfs4_state *state,
941 const struct nfs_lockowner *lockowner)
943 struct nfs4_lock_state *lsp;
948 if (lockowner == NULL)
951 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
954 fl_owner = lockowner->l_owner;
955 spin_lock(&state->state_lock);
956 lsp = __nfs4_find_lock_state(state, fl_owner);
957 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
959 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
960 nfs4_stateid_copy(dst, &lsp->ls_stateid);
963 spin_unlock(&state->state_lock);
964 nfs4_put_lock_state(lsp);
969 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
971 const nfs4_stateid *src;
976 seq = read_seqbegin(&state->seqlock);
977 if (test_bit(NFS_OPEN_STATE, &state->flags))
978 src = &state->open_stateid;
979 nfs4_stateid_copy(dst, src);
980 } while (read_seqretry(&state->seqlock, seq));
984 * Byte-range lock aware utility to initialize the stateid of read/write
987 int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
988 fmode_t fmode, const struct nfs_lockowner *lockowner)
990 int ret = nfs4_copy_lock_stateid(dst, state, lockowner);
992 /* A lost lock - don't even consider delegations */
994 /* returns true if delegation stateid found and copied */
995 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) {
1000 /* nfs4_copy_delegation_stateid() didn't over-write
1001 * dst, so it still has the lock stateid which we now
1005 nfs4_copy_open_stateid(dst, state);
1008 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1013 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1015 struct nfs_seqid *new;
1017 new = kmalloc(sizeof(*new), gfp_mask);
1019 new->sequence = counter;
1020 INIT_LIST_HEAD(&new->list);
1026 void nfs_release_seqid(struct nfs_seqid *seqid)
1028 struct nfs_seqid_counter *sequence;
1030 if (list_empty(&seqid->list))
1032 sequence = seqid->sequence;
1033 spin_lock(&sequence->lock);
1034 list_del_init(&seqid->list);
1035 if (!list_empty(&sequence->list)) {
1036 struct nfs_seqid *next;
1038 next = list_first_entry(&sequence->list,
1039 struct nfs_seqid, list);
1040 rpc_wake_up_queued_task(&sequence->wait, next->task);
1042 spin_unlock(&sequence->lock);
1045 void nfs_free_seqid(struct nfs_seqid *seqid)
1047 nfs_release_seqid(seqid);
1052 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1053 * failed with a seqid incrementing error -
1054 * see comments nfs4.h:seqid_mutating_error()
1056 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1061 case -NFS4ERR_BAD_SEQID:
1062 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1064 pr_warn_ratelimited("NFS: v4 server returned a bad"
1065 " sequence-id error on an"
1066 " unconfirmed sequence %p!\n",
1068 case -NFS4ERR_STALE_CLIENTID:
1069 case -NFS4ERR_STALE_STATEID:
1070 case -NFS4ERR_BAD_STATEID:
1071 case -NFS4ERR_BADXDR:
1072 case -NFS4ERR_RESOURCE:
1073 case -NFS4ERR_NOFILEHANDLE:
1074 /* Non-seqid mutating errors */
1078 * Note: no locking needed as we are guaranteed to be first
1079 * on the sequence list
1081 seqid->sequence->counter++;
1084 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1086 struct nfs4_state_owner *sp = container_of(seqid->sequence,
1087 struct nfs4_state_owner, so_seqid);
1088 struct nfs_server *server = sp->so_server;
1090 if (status == -NFS4ERR_BAD_SEQID)
1091 nfs4_drop_state_owner(sp);
1092 if (!nfs4_has_session(server->nfs_client))
1093 nfs_increment_seqid(status, seqid);
1097 * Increment the seqid if the LOCK/LOCKU succeeded, or
1098 * failed with a seqid incrementing error -
1099 * see comments nfs4.h:seqid_mutating_error()
1101 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1103 nfs_increment_seqid(status, seqid);
1106 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1108 struct nfs_seqid_counter *sequence = seqid->sequence;
1111 spin_lock(&sequence->lock);
1113 if (list_empty(&seqid->list))
1114 list_add_tail(&seqid->list, &sequence->list);
1115 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1117 rpc_sleep_on(&sequence->wait, task, NULL);
1120 spin_unlock(&sequence->lock);
1124 static int nfs4_run_state_manager(void *);
1126 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1128 smp_mb__before_atomic();
1129 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1130 smp_mb__after_atomic();
1131 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1132 rpc_wake_up(&clp->cl_rpcwaitq);
1136 * Schedule the nfs_client asynchronous state management routine
1138 void nfs4_schedule_state_manager(struct nfs_client *clp)
1140 struct task_struct *task;
1141 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1143 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1145 __module_get(THIS_MODULE);
1146 atomic_inc(&clp->cl_count);
1148 /* The rcu_read_lock() is not strictly necessary, as the state
1149 * manager is the only thread that ever changes the rpc_xprt
1150 * after it's initialized. At this point, we're single threaded. */
1152 snprintf(buf, sizeof(buf), "%s-manager",
1153 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1155 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1157 printk(KERN_ERR "%s: kthread_run: %ld\n",
1158 __func__, PTR_ERR(task));
1159 nfs4_clear_state_manager_bit(clp);
1160 nfs_put_client(clp);
1161 module_put(THIS_MODULE);
1166 * Schedule a lease recovery attempt
1168 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1172 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1173 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1174 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1176 nfs4_schedule_state_manager(clp);
1178 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1181 * nfs4_schedule_migration_recovery - trigger migration recovery
1183 * @server: FSID that is migrating
1185 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1186 * value is returned.
1188 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1190 struct nfs_client *clp = server->nfs_client;
1192 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1193 pr_err("NFS: volatile file handles not supported (server %s)\n",
1198 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1201 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1203 (unsigned long long)server->fsid.major,
1204 (unsigned long long)server->fsid.minor,
1207 set_bit(NFS_MIG_IN_TRANSITION,
1208 &((struct nfs_server *)server)->mig_status);
1209 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1211 nfs4_schedule_state_manager(clp);
1214 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1217 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1219 * @clp: server to check for moved leases
1222 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1224 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1225 __func__, clp->cl_clientid, clp->cl_hostname);
1227 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1228 nfs4_schedule_state_manager(clp);
1230 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1232 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1238 atomic_inc(&clp->cl_count);
1239 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1240 nfs_wait_bit_killable, TASK_KILLABLE);
1243 if (clp->cl_cons_state < 0)
1244 res = clp->cl_cons_state;
1246 nfs_put_client(clp);
1250 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1255 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1256 ret = nfs4_wait_clnt_recover(clp);
1259 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1260 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1262 nfs4_schedule_state_manager(clp);
1269 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1270 * @clp: client to process
1272 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1273 * resend of the SETCLIENTID and hence re-establish the
1274 * callback channel. Then return all existing delegations.
1276 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1278 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1279 nfs_expire_all_delegations(clp);
1280 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1284 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1286 nfs40_handle_cb_pathdown(clp);
1287 nfs4_schedule_state_manager(clp);
1290 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1293 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1294 /* Don't recover state that expired before the reboot */
1295 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1296 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1299 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1300 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1304 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1306 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1307 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1308 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1309 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1313 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1315 struct nfs_client *clp = server->nfs_client;
1317 if (!nfs4_valid_open_stateid(state))
1319 nfs4_state_mark_reclaim_nograce(clp, state);
1320 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1322 nfs4_schedule_state_manager(clp);
1325 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1327 void nfs_inode_find_state_and_recover(struct inode *inode,
1328 const nfs4_stateid *stateid)
1330 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1331 struct nfs_inode *nfsi = NFS_I(inode);
1332 struct nfs_open_context *ctx;
1333 struct nfs4_state *state;
1336 spin_lock(&inode->i_lock);
1337 list_for_each_entry(ctx, &nfsi->open_files, list) {
1341 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1343 if (!nfs4_stateid_match(&state->stateid, stateid))
1345 nfs4_state_mark_reclaim_nograce(clp, state);
1348 spin_unlock(&inode->i_lock);
1350 nfs4_schedule_state_manager(clp);
1353 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1355 struct inode *inode = state->inode;
1356 struct nfs_inode *nfsi = NFS_I(inode);
1357 struct nfs_open_context *ctx;
1359 spin_lock(&inode->i_lock);
1360 list_for_each_entry(ctx, &nfsi->open_files, list) {
1361 if (ctx->state != state)
1363 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1365 spin_unlock(&inode->i_lock);
1368 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1370 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1371 nfs4_state_mark_open_context_bad(state);
1375 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1377 struct inode *inode = state->inode;
1378 struct nfs_inode *nfsi = NFS_I(inode);
1379 struct file_lock *fl;
1382 if (inode->i_flock == NULL)
1385 /* Guard against delegation returns and new lock/unlock calls */
1386 down_write(&nfsi->rwsem);
1387 /* Protect inode->i_flock using the BKL */
1388 spin_lock(&inode->i_lock);
1389 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1390 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1392 if (nfs_file_open_context(fl->fl_file)->state != state)
1394 spin_unlock(&inode->i_lock);
1395 status = ops->recover_lock(state, fl);
1400 case -NFS4ERR_ADMIN_REVOKED:
1401 case -NFS4ERR_STALE_STATEID:
1402 case -NFS4ERR_BAD_STATEID:
1403 case -NFS4ERR_EXPIRED:
1404 case -NFS4ERR_NO_GRACE:
1405 case -NFS4ERR_STALE_CLIENTID:
1406 case -NFS4ERR_BADSESSION:
1407 case -NFS4ERR_BADSLOT:
1408 case -NFS4ERR_BAD_HIGH_SLOT:
1409 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1412 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1415 case -NFS4ERR_DENIED:
1416 case -NFS4ERR_RECLAIM_BAD:
1417 case -NFS4ERR_RECLAIM_CONFLICT:
1418 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1421 spin_lock(&inode->i_lock);
1423 spin_unlock(&inode->i_lock);
1425 up_write(&nfsi->rwsem);
1429 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1431 struct nfs4_state *state;
1432 struct nfs4_lock_state *lock;
1435 /* Note: we rely on the sp->so_states list being ordered
1436 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1438 * This is needed to ensure that the server won't give us any
1439 * read delegations that we have to return if, say, we are
1440 * recovering after a network partition or a reboot from a
1441 * server that doesn't support a grace period.
1443 spin_lock(&sp->so_lock);
1444 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1446 list_for_each_entry(state, &sp->so_states, open_states) {
1447 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1449 if (!nfs4_valid_open_stateid(state))
1451 if (state->state == 0)
1453 atomic_inc(&state->count);
1454 spin_unlock(&sp->so_lock);
1455 status = ops->recover_open(sp, state);
1457 status = nfs4_reclaim_locks(state, ops);
1459 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1460 spin_lock(&state->state_lock);
1461 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1462 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1463 pr_warn_ratelimited("NFS: "
1465 "failed!\n", __func__);
1467 spin_unlock(&state->state_lock);
1469 nfs4_put_open_state(state);
1470 spin_lock(&sp->so_lock);
1476 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1481 /* Open state on this file cannot be recovered */
1482 nfs4_state_mark_recovery_failed(state, status);
1486 case -NFS4ERR_ADMIN_REVOKED:
1487 case -NFS4ERR_STALE_STATEID:
1488 case -NFS4ERR_BAD_STATEID:
1489 case -NFS4ERR_RECLAIM_BAD:
1490 case -NFS4ERR_RECLAIM_CONFLICT:
1491 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1493 case -NFS4ERR_EXPIRED:
1494 case -NFS4ERR_NO_GRACE:
1495 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1496 case -NFS4ERR_STALE_CLIENTID:
1497 case -NFS4ERR_BADSESSION:
1498 case -NFS4ERR_BADSLOT:
1499 case -NFS4ERR_BAD_HIGH_SLOT:
1500 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1503 nfs4_put_open_state(state);
1504 spin_lock(&sp->so_lock);
1507 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1508 spin_unlock(&sp->so_lock);
1511 nfs4_put_open_state(state);
1512 spin_lock(&sp->so_lock);
1513 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1514 spin_unlock(&sp->so_lock);
1518 static void nfs4_clear_open_state(struct nfs4_state *state)
1520 struct nfs4_lock_state *lock;
1522 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1523 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1524 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1525 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1526 spin_lock(&state->state_lock);
1527 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1528 lock->ls_seqid.flags = 0;
1529 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1531 spin_unlock(&state->state_lock);
1534 static void nfs4_reset_seqids(struct nfs_server *server,
1535 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1537 struct nfs_client *clp = server->nfs_client;
1538 struct nfs4_state_owner *sp;
1539 struct rb_node *pos;
1540 struct nfs4_state *state;
1542 spin_lock(&clp->cl_lock);
1543 for (pos = rb_first(&server->state_owners);
1545 pos = rb_next(pos)) {
1546 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1547 sp->so_seqid.flags = 0;
1548 spin_lock(&sp->so_lock);
1549 list_for_each_entry(state, &sp->so_states, open_states) {
1550 if (mark_reclaim(clp, state))
1551 nfs4_clear_open_state(state);
1553 spin_unlock(&sp->so_lock);
1555 spin_unlock(&clp->cl_lock);
1558 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1559 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1561 struct nfs_server *server;
1564 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1565 nfs4_reset_seqids(server, mark_reclaim);
1569 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1571 /* Mark all delegations for reclaim */
1572 nfs_delegation_mark_reclaim(clp);
1573 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1576 static void nfs4_reclaim_complete(struct nfs_client *clp,
1577 const struct nfs4_state_recovery_ops *ops,
1578 struct rpc_cred *cred)
1580 /* Notify the server we're done reclaiming our state */
1581 if (ops->reclaim_complete)
1582 (void)ops->reclaim_complete(clp, cred);
1585 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1587 struct nfs_client *clp = server->nfs_client;
1588 struct nfs4_state_owner *sp;
1589 struct rb_node *pos;
1590 struct nfs4_state *state;
1592 spin_lock(&clp->cl_lock);
1593 for (pos = rb_first(&server->state_owners);
1595 pos = rb_next(pos)) {
1596 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1597 spin_lock(&sp->so_lock);
1598 list_for_each_entry(state, &sp->so_states, open_states) {
1599 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1602 nfs4_state_mark_reclaim_nograce(clp, state);
1604 spin_unlock(&sp->so_lock);
1606 spin_unlock(&clp->cl_lock);
1609 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1611 struct nfs_server *server;
1613 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1617 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1618 nfs4_clear_reclaim_server(server);
1621 nfs_delegation_reap_unclaimed(clp);
1625 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1627 const struct nfs4_state_recovery_ops *ops;
1628 struct rpc_cred *cred;
1630 if (!nfs4_state_clear_reclaim_reboot(clp))
1632 ops = clp->cl_mvops->reboot_recovery_ops;
1633 cred = nfs4_get_clid_cred(clp);
1634 nfs4_reclaim_complete(clp, ops, cred);
1638 static void nfs_delegation_clear_all(struct nfs_client *clp)
1640 nfs_delegation_mark_reclaim(clp);
1641 nfs_delegation_reap_unclaimed(clp);
1644 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1646 nfs_delegation_clear_all(clp);
1647 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1650 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1655 case -NFS4ERR_CB_PATH_DOWN:
1656 nfs40_handle_cb_pathdown(clp);
1658 case -NFS4ERR_NO_GRACE:
1659 nfs4_state_end_reclaim_reboot(clp);
1661 case -NFS4ERR_STALE_CLIENTID:
1662 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1663 nfs4_state_clear_reclaim_reboot(clp);
1664 nfs4_state_start_reclaim_reboot(clp);
1666 case -NFS4ERR_EXPIRED:
1667 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1668 nfs4_state_start_reclaim_nograce(clp);
1670 case -NFS4ERR_BADSESSION:
1671 case -NFS4ERR_BADSLOT:
1672 case -NFS4ERR_BAD_HIGH_SLOT:
1673 case -NFS4ERR_DEADSESSION:
1674 case -NFS4ERR_SEQ_FALSE_RETRY:
1675 case -NFS4ERR_SEQ_MISORDERED:
1676 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1677 /* Zero session reset errors */
1679 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1680 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1683 dprintk("%s: failed to handle error %d for server %s\n",
1684 __func__, error, clp->cl_hostname);
1687 dprintk("%s: handled error %d for server %s\n", __func__, error,
1692 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1694 struct nfs4_state_owner *sp;
1695 struct nfs_server *server;
1696 struct rb_node *pos;
1701 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1702 nfs4_purge_state_owners(server);
1703 spin_lock(&clp->cl_lock);
1704 for (pos = rb_first(&server->state_owners);
1706 pos = rb_next(pos)) {
1708 struct nfs4_state_owner, so_server_node);
1709 if (!test_and_clear_bit(ops->owner_flag_bit,
1712 atomic_inc(&sp->so_count);
1713 spin_unlock(&clp->cl_lock);
1716 status = nfs4_reclaim_open_state(sp, ops);
1718 set_bit(ops->owner_flag_bit, &sp->so_flags);
1719 nfs4_put_state_owner(sp);
1720 return nfs4_recovery_handle_error(clp, status);
1723 nfs4_put_state_owner(sp);
1726 spin_unlock(&clp->cl_lock);
1732 static int nfs4_check_lease(struct nfs_client *clp)
1734 struct rpc_cred *cred;
1735 const struct nfs4_state_maintenance_ops *ops =
1736 clp->cl_mvops->state_renewal_ops;
1739 /* Is the client already known to have an expired lease? */
1740 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1742 spin_lock(&clp->cl_lock);
1743 cred = ops->get_state_renewal_cred_locked(clp);
1744 spin_unlock(&clp->cl_lock);
1746 cred = nfs4_get_clid_cred(clp);
1751 status = ops->renew_lease(clp, cred);
1753 if (status == -ETIMEDOUT) {
1754 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1758 return nfs4_recovery_handle_error(clp, status);
1761 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1762 * and for recoverable errors on EXCHANGE_ID for v4.1
1764 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1767 case -NFS4ERR_SEQ_MISORDERED:
1768 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1769 return -ESERVERFAULT;
1770 /* Lease confirmation error: retry after purging the lease */
1772 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1774 case -NFS4ERR_STALE_CLIENTID:
1775 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1776 nfs4_state_clear_reclaim_reboot(clp);
1777 nfs4_state_start_reclaim_reboot(clp);
1779 case -NFS4ERR_CLID_INUSE:
1780 pr_err("NFS: Server %s reports our clientid is in use\n",
1782 nfs_mark_client_ready(clp, -EPERM);
1783 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1786 case -NFS4ERR_DELAY:
1792 case -NFS4ERR_MINOR_VERS_MISMATCH:
1793 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1794 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1795 dprintk("%s: exit with error %d for server %s\n",
1796 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1797 return -EPROTONOSUPPORT;
1798 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1799 * in nfs4_exchange_id */
1801 dprintk("%s: exit with error %d for server %s\n", __func__,
1802 status, clp->cl_hostname);
1805 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1806 dprintk("%s: handled error %d for server %s\n", __func__, status,
1811 static int nfs4_establish_lease(struct nfs_client *clp)
1813 struct rpc_cred *cred;
1814 const struct nfs4_state_recovery_ops *ops =
1815 clp->cl_mvops->reboot_recovery_ops;
1818 cred = nfs4_get_clid_cred(clp);
1821 status = ops->establish_clid(clp, cred);
1825 pnfs_destroy_all_layouts(clp);
1830 * Returns zero or a negative errno. NFS4ERR values are converted
1831 * to local errno values.
1833 static int nfs4_reclaim_lease(struct nfs_client *clp)
1837 status = nfs4_establish_lease(clp);
1839 return nfs4_handle_reclaim_lease_error(clp, status);
1840 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1841 nfs4_state_start_reclaim_nograce(clp);
1842 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1843 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1844 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1845 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1849 static int nfs4_purge_lease(struct nfs_client *clp)
1853 status = nfs4_establish_lease(clp);
1855 return nfs4_handle_reclaim_lease_error(clp, status);
1856 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1857 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1858 nfs4_state_start_reclaim_nograce(clp);
1863 * Try remote migration of one FSID from a source server to a
1864 * destination server. The source server provides a list of
1865 * potential destinations.
1867 * Returns zero or a negative NFS4ERR status code.
1869 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1871 struct nfs_client *clp = server->nfs_client;
1872 struct nfs4_fs_locations *locations = NULL;
1873 struct inode *inode;
1877 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1878 (unsigned long long)server->fsid.major,
1879 (unsigned long long)server->fsid.minor,
1883 page = alloc_page(GFP_KERNEL);
1884 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1885 if (page == NULL || locations == NULL) {
1886 dprintk("<-- %s: no memory\n", __func__);
1890 inode = server->super->s_root->d_inode;
1891 result = nfs4_proc_get_locations(inode, locations, page, cred);
1893 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1898 result = -NFS4ERR_NXIO;
1899 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1900 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1905 nfs4_begin_drain_session(clp);
1907 status = nfs4_replace_transport(server, locations);
1909 dprintk("<-- %s: failed to replace transport: %d\n",
1915 dprintk("<-- %s: migration succeeded\n", __func__);
1922 pr_err("NFS: migration recovery failed (server %s)\n",
1924 set_bit(NFS_MIG_FAILED, &server->mig_status);
1930 * Returns zero or a negative NFS4ERR status code.
1932 static int nfs4_handle_migration(struct nfs_client *clp)
1934 const struct nfs4_state_maintenance_ops *ops =
1935 clp->cl_mvops->state_renewal_ops;
1936 struct nfs_server *server;
1937 struct rpc_cred *cred;
1939 dprintk("%s: migration reported on \"%s\"\n", __func__,
1942 spin_lock(&clp->cl_lock);
1943 cred = ops->get_state_renewal_cred_locked(clp);
1944 spin_unlock(&clp->cl_lock);
1946 return -NFS4ERR_NOENT;
1951 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1954 if (server->mig_gen == clp->cl_mig_gen)
1956 server->mig_gen = clp->cl_mig_gen;
1958 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
1959 &server->mig_status))
1963 status = nfs4_try_migration(server, cred);
1976 * Test each nfs_server on the clp's cl_superblocks list to see
1977 * if it's moved to another server. Stop when the server no longer
1978 * returns NFS4ERR_LEASE_MOVED.
1980 static int nfs4_handle_lease_moved(struct nfs_client *clp)
1982 const struct nfs4_state_maintenance_ops *ops =
1983 clp->cl_mvops->state_renewal_ops;
1984 struct nfs_server *server;
1985 struct rpc_cred *cred;
1987 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
1990 spin_lock(&clp->cl_lock);
1991 cred = ops->get_state_renewal_cred_locked(clp);
1992 spin_unlock(&clp->cl_lock);
1994 return -NFS4ERR_NOENT;
1999 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2000 struct inode *inode;
2003 if (server->mig_gen == clp->cl_mig_gen)
2005 server->mig_gen = clp->cl_mig_gen;
2009 inode = server->super->s_root->d_inode;
2010 status = nfs4_proc_fsid_present(inode, cred);
2011 if (status != -NFS4ERR_MOVED)
2012 goto restart; /* wasn't this one */
2013 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2014 goto restart; /* there are more */
2025 * nfs4_discover_server_trunking - Detect server IP address trunking
2027 * @clp: nfs_client under test
2028 * @result: OUT: found nfs_client, or clp
2030 * Returns zero or a negative errno. If zero is returned,
2031 * an nfs_client pointer is planted in "result".
2033 * Note: since we are invoked in process context, and
2034 * not from inside the state manager, we cannot use
2035 * nfs4_handle_reclaim_lease_error().
2037 int nfs4_discover_server_trunking(struct nfs_client *clp,
2038 struct nfs_client **result)
2040 const struct nfs4_state_recovery_ops *ops =
2041 clp->cl_mvops->reboot_recovery_ops;
2042 struct rpc_clnt *clnt;
2043 struct rpc_cred *cred;
2046 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2048 clnt = clp->cl_rpcclient;
2051 mutex_lock(&nfs_clid_init_mutex);
2054 cred = nfs4_get_clid_cred(clp);
2058 status = ops->detect_trunking(clp, result, cred);
2064 if (clnt->cl_softrtry)
2066 case -NFS4ERR_DELAY:
2069 case -NFS4ERR_STALE_CLIENTID:
2070 dprintk("NFS: %s after status %d, retrying\n",
2075 nfs4_root_machine_cred(clp);
2078 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2080 case -NFS4ERR_CLID_INUSE:
2081 case -NFS4ERR_WRONGSEC:
2082 /* No point in retrying if we already used RPC_AUTH_UNIX */
2083 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2087 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2089 status = PTR_ERR(clnt);
2092 /* Note: this is safe because we haven't yet marked the
2093 * client as ready, so we are the only user of
2096 clnt = xchg(&clp->cl_rpcclient, clnt);
2097 rpc_shutdown_client(clnt);
2098 clnt = clp->cl_rpcclient;
2101 case -NFS4ERR_MINOR_VERS_MISMATCH:
2102 status = -EPROTONOSUPPORT;
2106 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2107 * in nfs4_exchange_id */
2108 status = -EKEYEXPIRED;
2111 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2117 mutex_unlock(&nfs_clid_init_mutex);
2118 dprintk("NFS: %s: status = %d\n", __func__, status);
2122 #ifdef CONFIG_NFS_V4_1
2123 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2125 struct nfs_client *clp = session->clp;
2129 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2131 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2132 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2134 nfs4_schedule_lease_recovery(clp);
2136 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2138 static void nfs41_ping_server(struct nfs_client *clp)
2140 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2141 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2142 nfs4_schedule_state_manager(clp);
2145 void nfs41_server_notify_target_slotid_update(struct nfs_client *clp)
2147 nfs41_ping_server(clp);
2150 void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp)
2152 nfs41_ping_server(clp);
2155 static void nfs4_reset_all_state(struct nfs_client *clp)
2157 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2158 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2159 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2160 nfs4_state_start_reclaim_nograce(clp);
2161 dprintk("%s: scheduling reset of all state for server %s!\n",
2162 __func__, clp->cl_hostname);
2163 nfs4_schedule_state_manager(clp);
2167 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2169 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2170 nfs4_state_start_reclaim_reboot(clp);
2171 dprintk("%s: server %s rebooted!\n", __func__,
2173 nfs4_schedule_state_manager(clp);
2177 static void nfs41_handle_state_revoked(struct nfs_client *clp)
2179 nfs4_reset_all_state(clp);
2180 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2183 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2185 /* This will need to handle layouts too */
2186 nfs_expire_all_delegations(clp);
2187 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2191 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2193 nfs_expire_all_delegations(clp);
2194 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
2195 nfs4_schedule_state_manager(clp);
2196 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2200 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2202 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2203 &clp->cl_state) == 0)
2204 nfs4_schedule_state_manager(clp);
2207 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
2212 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2213 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2215 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2216 nfs41_handle_server_reboot(clp);
2217 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
2218 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2219 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2220 nfs41_handle_state_revoked(clp);
2221 if (flags & SEQ4_STATUS_LEASE_MOVED)
2222 nfs4_schedule_lease_moved_recovery(clp);
2223 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2224 nfs41_handle_recallable_state_revoked(clp);
2225 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2226 nfs41_handle_backchannel_fault(clp);
2227 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2228 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2229 nfs41_handle_cb_path_down(clp);
2232 static int nfs4_reset_session(struct nfs_client *clp)
2234 struct rpc_cred *cred;
2237 if (!nfs4_has_session(clp))
2239 nfs4_begin_drain_session(clp);
2240 cred = nfs4_get_clid_cred(clp);
2241 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2244 case -NFS4ERR_BADSESSION:
2245 case -NFS4ERR_DEADSESSION:
2247 case -NFS4ERR_BACK_CHAN_BUSY:
2248 case -NFS4ERR_DELAY:
2249 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2254 status = nfs4_recovery_handle_error(clp, status);
2258 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2259 status = nfs4_proc_create_session(clp, cred);
2261 dprintk("%s: session reset failed with status %d for server %s!\n",
2262 __func__, status, clp->cl_hostname);
2263 status = nfs4_handle_reclaim_lease_error(clp, status);
2266 nfs41_finish_session_reset(clp);
2267 dprintk("%s: session reset was successful for server %s!\n",
2268 __func__, clp->cl_hostname);
2275 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2277 struct rpc_cred *cred;
2280 if (!nfs4_has_session(clp))
2282 nfs4_begin_drain_session(clp);
2283 cred = nfs4_get_clid_cred(clp);
2284 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2287 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2290 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2291 __func__, clp->cl_hostname);
2293 case -NFS4ERR_DELAY:
2295 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2298 return nfs4_recovery_handle_error(clp, ret);
2302 #else /* CONFIG_NFS_V4_1 */
2303 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2305 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2309 #endif /* CONFIG_NFS_V4_1 */
2311 static void nfs4_state_manager(struct nfs_client *clp)
2314 const char *section = "", *section_sep = "";
2316 /* Ensure exclusive access to NFSv4 state */
2318 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2319 section = "purge state";
2320 status = nfs4_purge_lease(clp);
2326 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2327 section = "lease expired";
2328 /* We're going to have to re-establish a clientid */
2329 status = nfs4_reclaim_lease(clp);
2335 /* Initialize or reset the session */
2336 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2337 section = "reset session";
2338 status = nfs4_reset_session(clp);
2339 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2345 /* Send BIND_CONN_TO_SESSION */
2346 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2348 section = "bind conn to session";
2349 status = nfs4_bind_conn_to_session(clp);
2355 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2356 section = "check lease";
2357 status = nfs4_check_lease(clp);
2362 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2363 section = "migration";
2364 status = nfs4_handle_migration(clp);
2369 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2370 section = "lease moved";
2371 status = nfs4_handle_lease_moved(clp);
2376 /* First recover reboot state... */
2377 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2378 section = "reclaim reboot";
2379 status = nfs4_do_reclaim(clp,
2380 clp->cl_mvops->reboot_recovery_ops);
2381 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2382 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
2384 nfs4_state_end_reclaim_reboot(clp);
2385 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2391 /* Now recover expired state... */
2392 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2393 section = "reclaim nograce";
2394 status = nfs4_do_reclaim(clp,
2395 clp->cl_mvops->nograce_recovery_ops);
2396 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2397 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
2398 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
2404 nfs4_end_drain_session(clp);
2405 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2406 nfs_client_return_marked_delegations(clp);
2410 nfs4_clear_state_manager_bit(clp);
2411 /* Did we race with an attempt to give us more work? */
2412 if (clp->cl_state == 0)
2414 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2416 } while (atomic_read(&clp->cl_count) > 1);
2419 if (strlen(section))
2421 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2422 " with error %d\n", section_sep, section,
2423 clp->cl_hostname, -status);
2425 nfs4_end_drain_session(clp);
2426 nfs4_clear_state_manager_bit(clp);
2429 static int nfs4_run_state_manager(void *ptr)
2431 struct nfs_client *clp = ptr;
2433 allow_signal(SIGKILL);
2434 nfs4_state_manager(clp);
2435 nfs_put_client(clp);
2436 module_put_and_exit(0);