4 * Client-side XDR for NFSv4.
6 * Copyright (c) 2002 The Regents of the University of Michigan.
9 * Kendrick Smith <kmsmith@umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
41 #include <linux/kernel.h>
42 #include <linux/slab.h>
44 #include <linux/nfs_fs.h>
45 #include <linux/kthread.h>
46 #include <linux/module.h>
47 #include <linux/random.h>
48 #include <linux/ratelimit.h>
49 #include <linux/workqueue.h>
50 #include <linux/bitops.h>
51 #include <linux/jiffies.h>
53 #include <linux/sunrpc/clnt.h>
57 #include "delegation.h"
59 #include "nfs4idmap.h"
60 #include "nfs4session.h"
64 #define NFSDBG_FACILITY NFSDBG_STATE
66 #define OPENOWNER_POOL_SIZE 8
68 const nfs4_stateid zero_stateid;
69 static DEFINE_MUTEX(nfs_clid_init_mutex);
71 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
73 struct nfs4_setclientid_res clid = {
74 .clientid = clp->cl_clientid,
75 .confirm = clp->cl_confirm,
79 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
81 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
83 port = nn->nfs_callback_tcpport;
84 if (clp->cl_addr.ss_family == AF_INET6)
85 port = nn->nfs_callback_tcpport6;
87 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
90 clp->cl_clientid = clid.clientid;
91 clp->cl_confirm = clid.confirm;
92 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
94 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
97 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
98 nfs4_schedule_state_renewal(clp);
104 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
106 * @clp: nfs_client under test
107 * @result: OUT: found nfs_client, or clp
108 * @cred: credential to use for trunking test
110 * Returns zero, a negative errno, or a negative NFS4ERR status.
111 * If zero is returned, an nfs_client pointer is planted in
114 * Note: The returned client may not yet be marked ready.
116 int nfs40_discover_server_trunking(struct nfs_client *clp,
117 struct nfs_client **result,
118 struct rpc_cred *cred)
120 struct nfs4_setclientid_res clid = {
121 .clientid = clp->cl_clientid,
122 .confirm = clp->cl_confirm,
124 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
128 port = nn->nfs_callback_tcpport;
129 if (clp->cl_addr.ss_family == AF_INET6)
130 port = nn->nfs_callback_tcpport6;
132 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
135 clp->cl_clientid = clid.clientid;
136 clp->cl_confirm = clid.confirm;
138 status = nfs40_walk_client_list(clp, result, cred);
140 /* Sustain the lease, even if it's empty. If the clientid4
141 * goes stale it's of no use for trunking discovery. */
142 nfs4_schedule_state_renewal(*result);
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 status = nfs4_proc_exchange_id(clp, cred);
315 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
317 status = nfs4_proc_create_session(clp, cred);
320 nfs41_finish_session_reset(clp);
321 nfs_mark_client_ready(clp, NFS_CS_READY);
327 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
329 * @clp: nfs_client under test
330 * @result: OUT: found nfs_client, or clp
331 * @cred: credential to use for trunking test
333 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
334 * If NFS4_OK is returned, an nfs_client pointer is planted in
337 * Note: The returned client may not yet be marked ready.
339 int nfs41_discover_server_trunking(struct nfs_client *clp,
340 struct nfs_client **result,
341 struct rpc_cred *cred)
345 status = nfs4_proc_exchange_id(clp, cred);
346 if (status != NFS4_OK)
349 status = nfs41_walk_client_list(clp, result, cred);
355 /* Purge state if the client id was established in a prior instance */
356 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R)
357 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
359 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
360 nfs4_schedule_state_manager(clp);
361 status = nfs_wait_client_init_complete(clp);
367 #endif /* CONFIG_NFS_V4_1 */
370 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
371 * @clp: client state handle
373 * Returns an rpc_cred with reference count bumped, or NULL.
375 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
377 struct rpc_cred *cred;
379 spin_lock(&clp->cl_lock);
380 cred = nfs4_get_machine_cred_locked(clp);
381 spin_unlock(&clp->cl_lock);
385 static struct nfs4_state_owner *
386 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
388 struct rb_node **p = &server->state_owners.rb_node,
390 struct nfs4_state_owner *sp;
394 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
396 if (cred < sp->so_cred)
397 p = &parent->rb_left;
398 else if (cred > sp->so_cred)
399 p = &parent->rb_right;
401 if (!list_empty(&sp->so_lru))
402 list_del_init(&sp->so_lru);
403 atomic_inc(&sp->so_count);
410 static struct nfs4_state_owner *
411 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
413 struct nfs_server *server = new->so_server;
414 struct rb_node **p = &server->state_owners.rb_node,
416 struct nfs4_state_owner *sp;
421 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
423 if (new->so_cred < sp->so_cred)
424 p = &parent->rb_left;
425 else if (new->so_cred > sp->so_cred)
426 p = &parent->rb_right;
428 if (!list_empty(&sp->so_lru))
429 list_del_init(&sp->so_lru);
430 atomic_inc(&sp->so_count);
434 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
437 rb_link_node(&new->so_server_node, parent, p);
438 rb_insert_color(&new->so_server_node, &server->state_owners);
443 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
445 struct nfs_server *server = sp->so_server;
447 if (!RB_EMPTY_NODE(&sp->so_server_node))
448 rb_erase(&sp->so_server_node, &server->state_owners);
449 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
453 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
455 sc->create_time = ktime_get();
458 spin_lock_init(&sc->lock);
459 INIT_LIST_HEAD(&sc->list);
460 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
464 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
466 rpc_destroy_wait_queue(&sc->wait);
470 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
471 * create a new state_owner.
474 static struct nfs4_state_owner *
475 nfs4_alloc_state_owner(struct nfs_server *server,
476 struct rpc_cred *cred,
479 struct nfs4_state_owner *sp;
481 sp = kzalloc(sizeof(*sp), gfp_flags);
484 sp->so_server = server;
485 sp->so_cred = get_rpccred(cred);
486 spin_lock_init(&sp->so_lock);
487 INIT_LIST_HEAD(&sp->so_states);
488 nfs4_init_seqid_counter(&sp->so_seqid);
489 atomic_set(&sp->so_count, 1);
490 INIT_LIST_HEAD(&sp->so_lru);
491 seqcount_init(&sp->so_reclaim_seqcount);
492 mutex_init(&sp->so_delegreturn_mutex);
497 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
499 struct rb_node *rb_node = &sp->so_server_node;
501 if (!RB_EMPTY_NODE(rb_node)) {
502 struct nfs_server *server = sp->so_server;
503 struct nfs_client *clp = server->nfs_client;
505 spin_lock(&clp->cl_lock);
506 if (!RB_EMPTY_NODE(rb_node)) {
507 rb_erase(rb_node, &server->state_owners);
508 RB_CLEAR_NODE(rb_node);
510 spin_unlock(&clp->cl_lock);
514 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
516 nfs4_destroy_seqid_counter(&sp->so_seqid);
517 put_rpccred(sp->so_cred);
521 static void nfs4_gc_state_owners(struct nfs_server *server)
523 struct nfs_client *clp = server->nfs_client;
524 struct nfs4_state_owner *sp, *tmp;
525 unsigned long time_min, time_max;
528 spin_lock(&clp->cl_lock);
530 time_min = (long)time_max - (long)clp->cl_lease_time;
531 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
532 /* NB: LRU is sorted so that oldest is at the head */
533 if (time_in_range(sp->so_expires, time_min, time_max))
535 list_move(&sp->so_lru, &doomed);
536 nfs4_remove_state_owner_locked(sp);
538 spin_unlock(&clp->cl_lock);
540 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
541 list_del(&sp->so_lru);
542 nfs4_free_state_owner(sp);
547 * nfs4_get_state_owner - Look up a state owner given a credential
548 * @server: nfs_server to search
549 * @cred: RPC credential to match
551 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
553 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
554 struct rpc_cred *cred,
557 struct nfs_client *clp = server->nfs_client;
558 struct nfs4_state_owner *sp, *new;
560 spin_lock(&clp->cl_lock);
561 sp = nfs4_find_state_owner_locked(server, cred);
562 spin_unlock(&clp->cl_lock);
565 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
569 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
571 spin_lock(&clp->cl_lock);
572 sp = nfs4_insert_state_owner_locked(new);
573 spin_unlock(&clp->cl_lock);
574 } while (sp == ERR_PTR(-EAGAIN));
576 nfs4_free_state_owner(new);
578 nfs4_gc_state_owners(server);
583 * nfs4_put_state_owner - Release a nfs4_state_owner
584 * @sp: state owner data to release
586 * Note that we keep released state owners on an LRU
588 * This caches valid state owners so that they can be
589 * reused, to avoid the OPEN_CONFIRM on minor version 0.
590 * It also pins the uniquifier of dropped state owners for
591 * a while, to ensure that those state owner names are
594 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
596 struct nfs_server *server = sp->so_server;
597 struct nfs_client *clp = server->nfs_client;
599 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
602 sp->so_expires = jiffies;
603 list_add_tail(&sp->so_lru, &server->state_owners_lru);
604 spin_unlock(&clp->cl_lock);
608 * nfs4_purge_state_owners - Release all cached state owners
609 * @server: nfs_server with cached state owners to release
611 * Called at umount time. Remaining state owners will be on
612 * the LRU with ref count of zero.
614 void nfs4_purge_state_owners(struct nfs_server *server)
616 struct nfs_client *clp = server->nfs_client;
617 struct nfs4_state_owner *sp, *tmp;
620 spin_lock(&clp->cl_lock);
621 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
622 list_move(&sp->so_lru, &doomed);
623 nfs4_remove_state_owner_locked(sp);
625 spin_unlock(&clp->cl_lock);
627 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
628 list_del(&sp->so_lru);
629 nfs4_free_state_owner(sp);
633 static struct nfs4_state *
634 nfs4_alloc_open_state(void)
636 struct nfs4_state *state;
638 state = kzalloc(sizeof(*state), GFP_NOFS);
641 atomic_set(&state->count, 1);
642 INIT_LIST_HEAD(&state->lock_states);
643 spin_lock_init(&state->state_lock);
644 seqlock_init(&state->seqlock);
649 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
651 if (state->state == fmode)
653 /* NB! List reordering - see the reclaim code for why. */
654 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
655 if (fmode & FMODE_WRITE)
656 list_move(&state->open_states, &state->owner->so_states);
658 list_move_tail(&state->open_states, &state->owner->so_states);
660 state->state = fmode;
663 static struct nfs4_state *
664 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
666 struct nfs_inode *nfsi = NFS_I(inode);
667 struct nfs4_state *state;
669 list_for_each_entry(state, &nfsi->open_states, inode_states) {
670 if (state->owner != owner)
672 if (!nfs4_valid_open_stateid(state))
674 if (atomic_inc_not_zero(&state->count))
681 nfs4_free_open_state(struct nfs4_state *state)
687 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
689 struct nfs4_state *state, *new;
690 struct nfs_inode *nfsi = NFS_I(inode);
692 spin_lock(&inode->i_lock);
693 state = __nfs4_find_state_byowner(inode, owner);
694 spin_unlock(&inode->i_lock);
697 new = nfs4_alloc_open_state();
698 spin_lock(&owner->so_lock);
699 spin_lock(&inode->i_lock);
700 state = __nfs4_find_state_byowner(inode, owner);
701 if (state == NULL && new != NULL) {
703 state->owner = owner;
704 atomic_inc(&owner->so_count);
705 list_add(&state->inode_states, &nfsi->open_states);
707 state->inode = inode;
708 spin_unlock(&inode->i_lock);
709 /* Note: The reclaim code dictates that we add stateless
710 * and read-only stateids to the end of the list */
711 list_add_tail(&state->open_states, &owner->so_states);
712 spin_unlock(&owner->so_lock);
714 spin_unlock(&inode->i_lock);
715 spin_unlock(&owner->so_lock);
717 nfs4_free_open_state(new);
723 void nfs4_put_open_state(struct nfs4_state *state)
725 struct inode *inode = state->inode;
726 struct nfs4_state_owner *owner = state->owner;
728 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
730 spin_lock(&inode->i_lock);
731 list_del(&state->inode_states);
732 list_del(&state->open_states);
733 spin_unlock(&inode->i_lock);
734 spin_unlock(&owner->so_lock);
736 nfs4_free_open_state(state);
737 nfs4_put_state_owner(owner);
741 * Close the current file.
743 static void __nfs4_close(struct nfs4_state *state,
744 fmode_t fmode, gfp_t gfp_mask, int wait)
746 struct nfs4_state_owner *owner = state->owner;
750 atomic_inc(&owner->so_count);
751 /* Protect against nfs4_find_state() */
752 spin_lock(&owner->so_lock);
753 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
760 case FMODE_READ|FMODE_WRITE:
763 newstate = FMODE_READ|FMODE_WRITE;
764 if (state->n_rdwr == 0) {
765 if (state->n_rdonly == 0) {
766 newstate &= ~FMODE_READ;
767 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
768 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
770 if (state->n_wronly == 0) {
771 newstate &= ~FMODE_WRITE;
772 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
773 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
776 clear_bit(NFS_DELEGATED_STATE, &state->flags);
778 nfs4_state_set_mode_locked(state, newstate);
779 spin_unlock(&owner->so_lock);
782 nfs4_put_open_state(state);
783 nfs4_put_state_owner(owner);
785 nfs4_do_close(state, gfp_mask, wait);
788 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
790 __nfs4_close(state, fmode, GFP_NOFS, 0);
793 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
795 __nfs4_close(state, fmode, GFP_KERNEL, 1);
799 * Search the state->lock_states for an existing lock_owner
800 * that is compatible with current->files
802 static struct nfs4_lock_state *
803 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
805 struct nfs4_lock_state *pos;
806 list_for_each_entry(pos, &state->lock_states, ls_locks) {
807 if (pos->ls_owner != fl_owner)
809 atomic_inc(&pos->ls_count);
816 * Return a compatible lock_state. If no initialized lock_state structure
817 * exists, return an uninitialized one.
820 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
822 struct nfs4_lock_state *lsp;
823 struct nfs_server *server = state->owner->so_server;
825 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
828 nfs4_init_seqid_counter(&lsp->ls_seqid);
829 atomic_set(&lsp->ls_count, 1);
830 lsp->ls_state = state;
831 lsp->ls_owner = fl_owner;
832 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
833 if (lsp->ls_seqid.owner_id < 0)
835 INIT_LIST_HEAD(&lsp->ls_locks);
842 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
844 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
845 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
850 * Return a compatible lock_state. If no initialized lock_state structure
851 * exists, return an uninitialized one.
854 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
856 struct nfs4_lock_state *lsp, *new = NULL;
859 spin_lock(&state->state_lock);
860 lsp = __nfs4_find_lock_state(state, owner);
864 list_add(&new->ls_locks, &state->lock_states);
865 set_bit(LK_STATE_IN_USE, &state->flags);
870 spin_unlock(&state->state_lock);
871 new = nfs4_alloc_lock_state(state, owner);
875 spin_unlock(&state->state_lock);
877 nfs4_free_lock_state(state->owner->so_server, new);
882 * Release reference to lock_state, and free it if we see that
883 * it is no longer in use
885 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
887 struct nfs_server *server;
888 struct nfs4_state *state;
892 state = lsp->ls_state;
893 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
895 list_del(&lsp->ls_locks);
896 if (list_empty(&state->lock_states))
897 clear_bit(LK_STATE_IN_USE, &state->flags);
898 spin_unlock(&state->state_lock);
899 server = state->owner->so_server;
900 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
901 struct nfs_client *clp = server->nfs_client;
903 clp->cl_mvops->free_lock_state(server, lsp);
905 nfs4_free_lock_state(server, lsp);
908 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
910 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
912 dst->fl_u.nfs4_fl.owner = lsp;
913 atomic_inc(&lsp->ls_count);
916 static void nfs4_fl_release_lock(struct file_lock *fl)
918 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
921 static const struct file_lock_operations nfs4_fl_lock_ops = {
922 .fl_copy_lock = nfs4_fl_copy_lock,
923 .fl_release_private = nfs4_fl_release_lock,
926 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
928 struct nfs4_lock_state *lsp;
930 if (fl->fl_ops != NULL)
932 lsp = nfs4_get_lock_state(state, fl->fl_owner);
935 fl->fl_u.nfs4_fl.owner = lsp;
936 fl->fl_ops = &nfs4_fl_lock_ops;
940 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
941 struct nfs4_state *state,
942 const struct nfs_lockowner *lockowner)
944 struct nfs4_lock_state *lsp;
949 if (lockowner == NULL)
952 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
955 fl_owner = lockowner->l_owner;
956 spin_lock(&state->state_lock);
957 lsp = __nfs4_find_lock_state(state, fl_owner);
958 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
960 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
961 nfs4_stateid_copy(dst, &lsp->ls_stateid);
964 spin_unlock(&state->state_lock);
965 nfs4_put_lock_state(lsp);
970 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
972 const nfs4_stateid *src;
977 seq = read_seqbegin(&state->seqlock);
978 if (test_bit(NFS_OPEN_STATE, &state->flags))
979 src = &state->open_stateid;
980 nfs4_stateid_copy(dst, src);
981 } while (read_seqretry(&state->seqlock, seq));
985 * Byte-range lock aware utility to initialize the stateid of read/write
988 int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
989 fmode_t fmode, const struct nfs_lockowner *lockowner)
991 int ret = nfs4_copy_lock_stateid(dst, state, lockowner);
993 /* A lost lock - don't even consider delegations */
995 /* returns true if delegation stateid found and copied */
996 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) {
1001 /* nfs4_copy_delegation_stateid() didn't over-write
1002 * dst, so it still has the lock stateid which we now
1006 nfs4_copy_open_stateid(dst, state);
1009 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1014 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1016 struct nfs_seqid *new;
1018 new = kmalloc(sizeof(*new), gfp_mask);
1020 return ERR_PTR(-ENOMEM);
1021 new->sequence = counter;
1022 INIT_LIST_HEAD(&new->list);
1027 void nfs_release_seqid(struct nfs_seqid *seqid)
1029 struct nfs_seqid_counter *sequence;
1031 if (seqid == NULL || list_empty(&seqid->list))
1033 sequence = seqid->sequence;
1034 spin_lock(&sequence->lock);
1035 list_del_init(&seqid->list);
1036 if (!list_empty(&sequence->list)) {
1037 struct nfs_seqid *next;
1039 next = list_first_entry(&sequence->list,
1040 struct nfs_seqid, list);
1041 rpc_wake_up_queued_task(&sequence->wait, next->task);
1043 spin_unlock(&sequence->lock);
1046 void nfs_free_seqid(struct nfs_seqid *seqid)
1048 nfs_release_seqid(seqid);
1053 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1054 * failed with a seqid incrementing error -
1055 * see comments nfs4.h:seqid_mutating_error()
1057 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1062 case -NFS4ERR_BAD_SEQID:
1063 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1065 pr_warn_ratelimited("NFS: v4 server returned a bad"
1066 " sequence-id error on an"
1067 " unconfirmed sequence %p!\n",
1069 case -NFS4ERR_STALE_CLIENTID:
1070 case -NFS4ERR_STALE_STATEID:
1071 case -NFS4ERR_BAD_STATEID:
1072 case -NFS4ERR_BADXDR:
1073 case -NFS4ERR_RESOURCE:
1074 case -NFS4ERR_NOFILEHANDLE:
1075 /* Non-seqid mutating errors */
1079 * Note: no locking needed as we are guaranteed to be first
1080 * on the sequence list
1082 seqid->sequence->counter++;
1085 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1087 struct nfs4_state_owner *sp;
1092 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1093 if (status == -NFS4ERR_BAD_SEQID)
1094 nfs4_drop_state_owner(sp);
1095 if (!nfs4_has_session(sp->so_server->nfs_client))
1096 nfs_increment_seqid(status, seqid);
1100 * Increment the seqid if the LOCK/LOCKU succeeded, or
1101 * failed with a seqid incrementing error -
1102 * see comments nfs4.h:seqid_mutating_error()
1104 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1107 nfs_increment_seqid(status, seqid);
1110 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1112 struct nfs_seqid_counter *sequence;
1117 sequence = seqid->sequence;
1118 spin_lock(&sequence->lock);
1120 if (list_empty(&seqid->list))
1121 list_add_tail(&seqid->list, &sequence->list);
1122 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1124 rpc_sleep_on(&sequence->wait, task, NULL);
1127 spin_unlock(&sequence->lock);
1132 static int nfs4_run_state_manager(void *);
1134 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1136 smp_mb__before_atomic();
1137 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1138 smp_mb__after_atomic();
1139 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1140 rpc_wake_up(&clp->cl_rpcwaitq);
1144 * Schedule the nfs_client asynchronous state management routine
1146 void nfs4_schedule_state_manager(struct nfs_client *clp)
1148 struct task_struct *task;
1149 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1151 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1153 __module_get(THIS_MODULE);
1154 atomic_inc(&clp->cl_count);
1156 /* The rcu_read_lock() is not strictly necessary, as the state
1157 * manager is the only thread that ever changes the rpc_xprt
1158 * after it's initialized. At this point, we're single threaded. */
1160 snprintf(buf, sizeof(buf), "%s-manager",
1161 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1163 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1165 printk(KERN_ERR "%s: kthread_run: %ld\n",
1166 __func__, PTR_ERR(task));
1167 nfs4_clear_state_manager_bit(clp);
1168 nfs_put_client(clp);
1169 module_put(THIS_MODULE);
1174 * Schedule a lease recovery attempt
1176 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1180 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1181 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1182 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1184 nfs4_schedule_state_manager(clp);
1186 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1189 * nfs4_schedule_migration_recovery - trigger migration recovery
1191 * @server: FSID that is migrating
1193 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1194 * value is returned.
1196 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1198 struct nfs_client *clp = server->nfs_client;
1200 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1201 pr_err("NFS: volatile file handles not supported (server %s)\n",
1206 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1209 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1211 (unsigned long long)server->fsid.major,
1212 (unsigned long long)server->fsid.minor,
1215 set_bit(NFS_MIG_IN_TRANSITION,
1216 &((struct nfs_server *)server)->mig_status);
1217 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1219 nfs4_schedule_state_manager(clp);
1222 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1225 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1227 * @clp: server to check for moved leases
1230 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1232 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1233 __func__, clp->cl_clientid, clp->cl_hostname);
1235 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1236 nfs4_schedule_state_manager(clp);
1238 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1240 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1246 atomic_inc(&clp->cl_count);
1247 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1248 nfs_wait_bit_killable, TASK_KILLABLE);
1251 if (clp->cl_cons_state < 0)
1252 res = clp->cl_cons_state;
1254 nfs_put_client(clp);
1258 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1263 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1264 ret = nfs4_wait_clnt_recover(clp);
1267 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1268 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1270 nfs4_schedule_state_manager(clp);
1277 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1278 * @clp: client to process
1280 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1281 * resend of the SETCLIENTID and hence re-establish the
1282 * callback channel. Then return all existing delegations.
1284 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1286 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1287 nfs_expire_all_delegations(clp);
1288 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1292 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1294 nfs40_handle_cb_pathdown(clp);
1295 nfs4_schedule_state_manager(clp);
1298 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1301 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1302 /* Don't recover state that expired before the reboot */
1303 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1304 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1307 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1308 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1312 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1314 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1315 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1316 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1317 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1321 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1323 struct nfs_client *clp = server->nfs_client;
1325 if (!nfs4_valid_open_stateid(state))
1327 nfs4_state_mark_reclaim_nograce(clp, state);
1328 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1330 nfs4_schedule_state_manager(clp);
1333 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1335 void nfs_inode_find_state_and_recover(struct inode *inode,
1336 const nfs4_stateid *stateid)
1338 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1339 struct nfs_inode *nfsi = NFS_I(inode);
1340 struct nfs_open_context *ctx;
1341 struct nfs4_state *state;
1344 spin_lock(&inode->i_lock);
1345 list_for_each_entry(ctx, &nfsi->open_files, list) {
1349 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1351 if (!nfs4_stateid_match(&state->stateid, stateid))
1353 nfs4_state_mark_reclaim_nograce(clp, state);
1356 spin_unlock(&inode->i_lock);
1358 nfs4_schedule_state_manager(clp);
1361 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1363 struct inode *inode = state->inode;
1364 struct nfs_inode *nfsi = NFS_I(inode);
1365 struct nfs_open_context *ctx;
1367 spin_lock(&inode->i_lock);
1368 list_for_each_entry(ctx, &nfsi->open_files, list) {
1369 if (ctx->state != state)
1371 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1373 spin_unlock(&inode->i_lock);
1376 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1378 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1379 nfs4_state_mark_open_context_bad(state);
1383 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1385 struct inode *inode = state->inode;
1386 struct nfs_inode *nfsi = NFS_I(inode);
1387 struct file_lock *fl;
1389 struct file_lock_context *flctx = inode->i_flctx;
1390 struct list_head *list;
1395 list = &flctx->flc_posix;
1397 /* Guard against delegation returns and new lock/unlock calls */
1398 down_write(&nfsi->rwsem);
1399 spin_lock(&flctx->flc_lock);
1401 list_for_each_entry(fl, list, fl_list) {
1402 if (nfs_file_open_context(fl->fl_file)->state != state)
1404 spin_unlock(&flctx->flc_lock);
1405 status = ops->recover_lock(state, fl);
1410 case -NFS4ERR_ADMIN_REVOKED:
1411 case -NFS4ERR_STALE_STATEID:
1412 case -NFS4ERR_BAD_STATEID:
1413 case -NFS4ERR_EXPIRED:
1414 case -NFS4ERR_NO_GRACE:
1415 case -NFS4ERR_STALE_CLIENTID:
1416 case -NFS4ERR_BADSESSION:
1417 case -NFS4ERR_BADSLOT:
1418 case -NFS4ERR_BAD_HIGH_SLOT:
1419 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1422 pr_err("NFS: %s: unhandled error %d\n",
1425 case -NFS4ERR_DENIED:
1426 case -NFS4ERR_RECLAIM_BAD:
1427 case -NFS4ERR_RECLAIM_CONFLICT:
1428 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1431 spin_lock(&flctx->flc_lock);
1433 if (list == &flctx->flc_posix) {
1434 list = &flctx->flc_flock;
1437 spin_unlock(&flctx->flc_lock);
1439 up_write(&nfsi->rwsem);
1443 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1445 struct nfs4_state *state;
1446 struct nfs4_lock_state *lock;
1449 /* Note: we rely on the sp->so_states list being ordered
1450 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1452 * This is needed to ensure that the server won't give us any
1453 * read delegations that we have to return if, say, we are
1454 * recovering after a network partition or a reboot from a
1455 * server that doesn't support a grace period.
1457 spin_lock(&sp->so_lock);
1458 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1460 list_for_each_entry(state, &sp->so_states, open_states) {
1461 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1463 if (!nfs4_valid_open_stateid(state))
1465 if (state->state == 0)
1467 atomic_inc(&state->count);
1468 spin_unlock(&sp->so_lock);
1469 status = ops->recover_open(sp, state);
1471 status = nfs4_reclaim_locks(state, ops);
1473 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1474 spin_lock(&state->state_lock);
1475 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1476 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1477 pr_warn_ratelimited("NFS: "
1479 "failed!\n", __func__);
1481 spin_unlock(&state->state_lock);
1483 nfs4_put_open_state(state);
1484 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
1486 spin_lock(&sp->so_lock);
1492 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1500 /* Open state on this file cannot be recovered */
1501 nfs4_state_mark_recovery_failed(state, status);
1505 case -NFS4ERR_ADMIN_REVOKED:
1506 case -NFS4ERR_STALE_STATEID:
1507 case -NFS4ERR_BAD_STATEID:
1508 case -NFS4ERR_RECLAIM_BAD:
1509 case -NFS4ERR_RECLAIM_CONFLICT:
1510 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1512 case -NFS4ERR_EXPIRED:
1513 case -NFS4ERR_NO_GRACE:
1514 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1515 case -NFS4ERR_STALE_CLIENTID:
1516 case -NFS4ERR_BADSESSION:
1517 case -NFS4ERR_BADSLOT:
1518 case -NFS4ERR_BAD_HIGH_SLOT:
1519 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1522 nfs4_put_open_state(state);
1523 spin_lock(&sp->so_lock);
1526 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1527 spin_unlock(&sp->so_lock);
1530 nfs4_put_open_state(state);
1531 spin_lock(&sp->so_lock);
1532 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1533 spin_unlock(&sp->so_lock);
1537 static void nfs4_clear_open_state(struct nfs4_state *state)
1539 struct nfs4_lock_state *lock;
1541 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1542 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1543 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1544 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1545 spin_lock(&state->state_lock);
1546 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1547 lock->ls_seqid.flags = 0;
1548 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1550 spin_unlock(&state->state_lock);
1553 static void nfs4_reset_seqids(struct nfs_server *server,
1554 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1556 struct nfs_client *clp = server->nfs_client;
1557 struct nfs4_state_owner *sp;
1558 struct rb_node *pos;
1559 struct nfs4_state *state;
1561 spin_lock(&clp->cl_lock);
1562 for (pos = rb_first(&server->state_owners);
1564 pos = rb_next(pos)) {
1565 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1566 sp->so_seqid.flags = 0;
1567 spin_lock(&sp->so_lock);
1568 list_for_each_entry(state, &sp->so_states, open_states) {
1569 if (mark_reclaim(clp, state))
1570 nfs4_clear_open_state(state);
1572 spin_unlock(&sp->so_lock);
1574 spin_unlock(&clp->cl_lock);
1577 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1578 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1580 struct nfs_server *server;
1583 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1584 nfs4_reset_seqids(server, mark_reclaim);
1588 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1590 /* Mark all delegations for reclaim */
1591 nfs_delegation_mark_reclaim(clp);
1592 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1595 static void nfs4_reclaim_complete(struct nfs_client *clp,
1596 const struct nfs4_state_recovery_ops *ops,
1597 struct rpc_cred *cred)
1599 /* Notify the server we're done reclaiming our state */
1600 if (ops->reclaim_complete)
1601 (void)ops->reclaim_complete(clp, cred);
1604 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1606 struct nfs_client *clp = server->nfs_client;
1607 struct nfs4_state_owner *sp;
1608 struct rb_node *pos;
1609 struct nfs4_state *state;
1611 spin_lock(&clp->cl_lock);
1612 for (pos = rb_first(&server->state_owners);
1614 pos = rb_next(pos)) {
1615 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1616 spin_lock(&sp->so_lock);
1617 list_for_each_entry(state, &sp->so_states, open_states) {
1618 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1621 nfs4_state_mark_reclaim_nograce(clp, state);
1623 spin_unlock(&sp->so_lock);
1625 spin_unlock(&clp->cl_lock);
1628 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1630 struct nfs_server *server;
1632 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1636 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1637 nfs4_clear_reclaim_server(server);
1640 nfs_delegation_reap_unclaimed(clp);
1644 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1646 const struct nfs4_state_recovery_ops *ops;
1647 struct rpc_cred *cred;
1649 if (!nfs4_state_clear_reclaim_reboot(clp))
1651 ops = clp->cl_mvops->reboot_recovery_ops;
1652 cred = nfs4_get_clid_cred(clp);
1653 nfs4_reclaim_complete(clp, ops, cred);
1657 static void nfs_delegation_clear_all(struct nfs_client *clp)
1659 nfs_delegation_mark_reclaim(clp);
1660 nfs_delegation_reap_unclaimed(clp);
1663 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1665 nfs_delegation_clear_all(clp);
1666 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1669 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1674 case -NFS4ERR_CB_PATH_DOWN:
1675 nfs40_handle_cb_pathdown(clp);
1677 case -NFS4ERR_NO_GRACE:
1678 nfs4_state_end_reclaim_reboot(clp);
1680 case -NFS4ERR_STALE_CLIENTID:
1681 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1682 nfs4_state_clear_reclaim_reboot(clp);
1683 nfs4_state_start_reclaim_reboot(clp);
1685 case -NFS4ERR_EXPIRED:
1686 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1687 nfs4_state_start_reclaim_nograce(clp);
1689 case -NFS4ERR_BADSESSION:
1690 case -NFS4ERR_BADSLOT:
1691 case -NFS4ERR_BAD_HIGH_SLOT:
1692 case -NFS4ERR_DEADSESSION:
1693 case -NFS4ERR_SEQ_FALSE_RETRY:
1694 case -NFS4ERR_SEQ_MISORDERED:
1695 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1696 /* Zero session reset errors */
1698 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1699 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1702 dprintk("%s: failed to handle error %d for server %s\n",
1703 __func__, error, clp->cl_hostname);
1706 dprintk("%s: handled error %d for server %s\n", __func__, error,
1711 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1713 struct nfs4_state_owner *sp;
1714 struct nfs_server *server;
1715 struct rb_node *pos;
1720 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1721 nfs4_purge_state_owners(server);
1722 spin_lock(&clp->cl_lock);
1723 for (pos = rb_first(&server->state_owners);
1725 pos = rb_next(pos)) {
1727 struct nfs4_state_owner, so_server_node);
1728 if (!test_and_clear_bit(ops->owner_flag_bit,
1731 if (!atomic_inc_not_zero(&sp->so_count))
1733 spin_unlock(&clp->cl_lock);
1736 status = nfs4_reclaim_open_state(sp, ops);
1738 set_bit(ops->owner_flag_bit, &sp->so_flags);
1739 nfs4_put_state_owner(sp);
1740 status = nfs4_recovery_handle_error(clp, status);
1741 return (status != 0) ? status : -EAGAIN;
1744 nfs4_put_state_owner(sp);
1747 spin_unlock(&clp->cl_lock);
1753 static int nfs4_check_lease(struct nfs_client *clp)
1755 struct rpc_cred *cred;
1756 const struct nfs4_state_maintenance_ops *ops =
1757 clp->cl_mvops->state_renewal_ops;
1760 /* Is the client already known to have an expired lease? */
1761 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1763 spin_lock(&clp->cl_lock);
1764 cred = ops->get_state_renewal_cred_locked(clp);
1765 spin_unlock(&clp->cl_lock);
1767 cred = nfs4_get_clid_cred(clp);
1772 status = ops->renew_lease(clp, cred);
1774 if (status == -ETIMEDOUT) {
1775 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1779 return nfs4_recovery_handle_error(clp, status);
1782 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1783 * and for recoverable errors on EXCHANGE_ID for v4.1
1785 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1788 case -NFS4ERR_SEQ_MISORDERED:
1789 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1790 return -ESERVERFAULT;
1791 /* Lease confirmation error: retry after purging the lease */
1793 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1795 case -NFS4ERR_STALE_CLIENTID:
1796 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1797 nfs4_state_start_reclaim_reboot(clp);
1799 case -NFS4ERR_CLID_INUSE:
1800 pr_err("NFS: Server %s reports our clientid is in use\n",
1802 nfs_mark_client_ready(clp, -EPERM);
1803 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1806 case -NFS4ERR_DELAY:
1812 case -NFS4ERR_MINOR_VERS_MISMATCH:
1813 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1814 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1815 dprintk("%s: exit with error %d for server %s\n",
1816 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1817 return -EPROTONOSUPPORT;
1818 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1819 * in nfs4_exchange_id */
1821 dprintk("%s: exit with error %d for server %s\n", __func__,
1822 status, clp->cl_hostname);
1825 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1826 dprintk("%s: handled error %d for server %s\n", __func__, status,
1831 static int nfs4_establish_lease(struct nfs_client *clp)
1833 struct rpc_cred *cred;
1834 const struct nfs4_state_recovery_ops *ops =
1835 clp->cl_mvops->reboot_recovery_ops;
1838 nfs4_begin_drain_session(clp);
1839 cred = nfs4_get_clid_cred(clp);
1842 status = ops->establish_clid(clp, cred);
1846 pnfs_destroy_all_layouts(clp);
1851 * Returns zero or a negative errno. NFS4ERR values are converted
1852 * to local errno values.
1854 static int nfs4_reclaim_lease(struct nfs_client *clp)
1858 status = nfs4_establish_lease(clp);
1860 return nfs4_handle_reclaim_lease_error(clp, status);
1861 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1862 nfs4_state_start_reclaim_nograce(clp);
1863 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1864 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1865 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1866 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1870 static int nfs4_purge_lease(struct nfs_client *clp)
1874 status = nfs4_establish_lease(clp);
1876 return nfs4_handle_reclaim_lease_error(clp, status);
1877 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1878 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1879 nfs4_state_start_reclaim_nograce(clp);
1884 * Try remote migration of one FSID from a source server to a
1885 * destination server. The source server provides a list of
1886 * potential destinations.
1888 * Returns zero or a negative NFS4ERR status code.
1890 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1892 struct nfs_client *clp = server->nfs_client;
1893 struct nfs4_fs_locations *locations = NULL;
1894 struct inode *inode;
1898 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1899 (unsigned long long)server->fsid.major,
1900 (unsigned long long)server->fsid.minor,
1904 page = alloc_page(GFP_KERNEL);
1905 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1906 if (page == NULL || locations == NULL) {
1907 dprintk("<-- %s: no memory\n", __func__);
1911 inode = d_inode(server->super->s_root);
1912 result = nfs4_proc_get_locations(inode, locations, page, cred);
1914 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1919 result = -NFS4ERR_NXIO;
1920 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1921 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1926 nfs4_begin_drain_session(clp);
1928 status = nfs4_replace_transport(server, locations);
1930 dprintk("<-- %s: failed to replace transport: %d\n",
1936 dprintk("<-- %s: migration succeeded\n", __func__);
1943 pr_err("NFS: migration recovery failed (server %s)\n",
1945 set_bit(NFS_MIG_FAILED, &server->mig_status);
1951 * Returns zero or a negative NFS4ERR status code.
1953 static int nfs4_handle_migration(struct nfs_client *clp)
1955 const struct nfs4_state_maintenance_ops *ops =
1956 clp->cl_mvops->state_renewal_ops;
1957 struct nfs_server *server;
1958 struct rpc_cred *cred;
1960 dprintk("%s: migration reported on \"%s\"\n", __func__,
1963 spin_lock(&clp->cl_lock);
1964 cred = ops->get_state_renewal_cred_locked(clp);
1965 spin_unlock(&clp->cl_lock);
1967 return -NFS4ERR_NOENT;
1972 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1975 if (server->mig_gen == clp->cl_mig_gen)
1977 server->mig_gen = clp->cl_mig_gen;
1979 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
1980 &server->mig_status))
1984 status = nfs4_try_migration(server, cred);
1997 * Test each nfs_server on the clp's cl_superblocks list to see
1998 * if it's moved to another server. Stop when the server no longer
1999 * returns NFS4ERR_LEASE_MOVED.
2001 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2003 const struct nfs4_state_maintenance_ops *ops =
2004 clp->cl_mvops->state_renewal_ops;
2005 struct nfs_server *server;
2006 struct rpc_cred *cred;
2008 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2011 spin_lock(&clp->cl_lock);
2012 cred = ops->get_state_renewal_cred_locked(clp);
2013 spin_unlock(&clp->cl_lock);
2015 return -NFS4ERR_NOENT;
2020 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2021 struct inode *inode;
2024 if (server->mig_gen == clp->cl_mig_gen)
2026 server->mig_gen = clp->cl_mig_gen;
2030 inode = d_inode(server->super->s_root);
2031 status = nfs4_proc_fsid_present(inode, cred);
2032 if (status != -NFS4ERR_MOVED)
2033 goto restart; /* wasn't this one */
2034 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2035 goto restart; /* there are more */
2046 * nfs4_discover_server_trunking - Detect server IP address trunking
2048 * @clp: nfs_client under test
2049 * @result: OUT: found nfs_client, or clp
2051 * Returns zero or a negative errno. If zero is returned,
2052 * an nfs_client pointer is planted in "result".
2054 * Note: since we are invoked in process context, and
2055 * not from inside the state manager, we cannot use
2056 * nfs4_handle_reclaim_lease_error().
2058 int nfs4_discover_server_trunking(struct nfs_client *clp,
2059 struct nfs_client **result)
2061 const struct nfs4_state_recovery_ops *ops =
2062 clp->cl_mvops->reboot_recovery_ops;
2063 struct rpc_clnt *clnt;
2064 struct rpc_cred *cred;
2067 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2069 clnt = clp->cl_rpcclient;
2072 mutex_lock(&nfs_clid_init_mutex);
2075 cred = nfs4_get_clid_cred(clp);
2079 status = ops->detect_trunking(clp, result, cred);
2085 if (clnt->cl_softrtry)
2087 case -NFS4ERR_DELAY:
2090 case -NFS4ERR_STALE_CLIENTID:
2091 dprintk("NFS: %s after status %d, retrying\n",
2096 nfs4_root_machine_cred(clp);
2099 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2101 case -NFS4ERR_CLID_INUSE:
2102 case -NFS4ERR_WRONGSEC:
2103 /* No point in retrying if we already used RPC_AUTH_UNIX */
2104 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2108 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2110 status = PTR_ERR(clnt);
2113 /* Note: this is safe because we haven't yet marked the
2114 * client as ready, so we are the only user of
2117 clnt = xchg(&clp->cl_rpcclient, clnt);
2118 rpc_shutdown_client(clnt);
2119 clnt = clp->cl_rpcclient;
2122 case -NFS4ERR_MINOR_VERS_MISMATCH:
2123 status = -EPROTONOSUPPORT;
2127 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2128 * in nfs4_exchange_id */
2129 status = -EKEYEXPIRED;
2132 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2138 mutex_unlock(&nfs_clid_init_mutex);
2139 dprintk("NFS: %s: status = %d\n", __func__, status);
2143 #ifdef CONFIG_NFS_V4_1
2144 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2146 struct nfs_client *clp = session->clp;
2150 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2152 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2153 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2155 nfs4_schedule_lease_recovery(clp);
2157 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2159 void nfs41_notify_server(struct nfs_client *clp)
2161 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2162 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2163 nfs4_schedule_state_manager(clp);
2166 static void nfs4_reset_all_state(struct nfs_client *clp)
2168 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2169 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2170 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2171 nfs4_state_start_reclaim_nograce(clp);
2172 dprintk("%s: scheduling reset of all state for server %s!\n",
2173 __func__, clp->cl_hostname);
2174 nfs4_schedule_state_manager(clp);
2178 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2180 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2181 nfs4_state_start_reclaim_reboot(clp);
2182 dprintk("%s: server %s rebooted!\n", __func__,
2184 nfs4_schedule_state_manager(clp);
2188 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2190 nfs4_reset_all_state(clp);
2191 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2194 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2196 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
2197 nfs4_schedule_state_manager(clp);
2199 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2202 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2204 /* FIXME: For now, we destroy all layouts. */
2205 pnfs_destroy_all_layouts(clp);
2206 /* FIXME: For now, we test all delegations+open state+locks. */
2207 nfs41_handle_some_state_revoked(clp);
2208 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2212 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2214 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2215 nfs4_schedule_state_manager(clp);
2217 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2221 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2223 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2224 &clp->cl_state) == 0)
2225 nfs4_schedule_state_manager(clp);
2228 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
2233 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2234 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2236 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2237 nfs41_handle_server_reboot(clp);
2238 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2239 nfs41_handle_all_state_revoked(clp);
2240 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2241 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2242 nfs41_handle_some_state_revoked(clp);
2243 if (flags & SEQ4_STATUS_LEASE_MOVED)
2244 nfs4_schedule_lease_moved_recovery(clp);
2245 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2246 nfs41_handle_recallable_state_revoked(clp);
2247 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2248 nfs41_handle_backchannel_fault(clp);
2249 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2250 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2251 nfs41_handle_cb_path_down(clp);
2254 static int nfs4_reset_session(struct nfs_client *clp)
2256 struct rpc_cred *cred;
2259 if (!nfs4_has_session(clp))
2261 nfs4_begin_drain_session(clp);
2262 cred = nfs4_get_clid_cred(clp);
2263 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2266 case -NFS4ERR_BADSESSION:
2267 case -NFS4ERR_DEADSESSION:
2269 case -NFS4ERR_BACK_CHAN_BUSY:
2270 case -NFS4ERR_DELAY:
2271 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2276 status = nfs4_recovery_handle_error(clp, status);
2280 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2281 status = nfs4_proc_create_session(clp, cred);
2283 dprintk("%s: session reset failed with status %d for server %s!\n",
2284 __func__, status, clp->cl_hostname);
2285 status = nfs4_handle_reclaim_lease_error(clp, status);
2288 nfs41_finish_session_reset(clp);
2289 dprintk("%s: session reset was successful for server %s!\n",
2290 __func__, clp->cl_hostname);
2297 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2299 struct rpc_cred *cred;
2302 if (!nfs4_has_session(clp))
2304 nfs4_begin_drain_session(clp);
2305 cred = nfs4_get_clid_cred(clp);
2306 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2309 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2312 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2313 __func__, clp->cl_hostname);
2315 case -NFS4ERR_DELAY:
2317 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2320 return nfs4_recovery_handle_error(clp, ret);
2324 #else /* CONFIG_NFS_V4_1 */
2325 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2327 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2331 #endif /* CONFIG_NFS_V4_1 */
2333 static void nfs4_state_manager(struct nfs_client *clp)
2336 const char *section = "", *section_sep = "";
2338 /* Ensure exclusive access to NFSv4 state */
2340 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2341 section = "purge state";
2342 status = nfs4_purge_lease(clp);
2348 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2349 section = "lease expired";
2350 /* We're going to have to re-establish a clientid */
2351 status = nfs4_reclaim_lease(clp);
2357 /* Initialize or reset the session */
2358 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2359 section = "reset session";
2360 status = nfs4_reset_session(clp);
2361 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2367 /* Send BIND_CONN_TO_SESSION */
2368 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2370 section = "bind conn to session";
2371 status = nfs4_bind_conn_to_session(clp);
2377 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2378 section = "check lease";
2379 status = nfs4_check_lease(clp);
2385 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2386 section = "migration";
2387 status = nfs4_handle_migration(clp);
2392 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2393 section = "lease moved";
2394 status = nfs4_handle_lease_moved(clp);
2399 /* First recover reboot state... */
2400 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2401 section = "reclaim reboot";
2402 status = nfs4_do_reclaim(clp,
2403 clp->cl_mvops->reboot_recovery_ops);
2404 if (status == -EAGAIN)
2408 nfs4_state_end_reclaim_reboot(clp);
2411 /* Now recover expired state... */
2412 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2413 section = "reclaim nograce";
2414 status = nfs4_do_reclaim(clp,
2415 clp->cl_mvops->nograce_recovery_ops);
2416 if (status == -EAGAIN)
2422 nfs4_end_drain_session(clp);
2423 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2424 nfs_client_return_marked_delegations(clp);
2428 nfs4_clear_state_manager_bit(clp);
2429 /* Did we race with an attempt to give us more work? */
2430 if (clp->cl_state == 0)
2432 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2434 } while (atomic_read(&clp->cl_count) > 1);
2437 if (strlen(section))
2439 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2440 " with error %d\n", section_sep, section,
2441 clp->cl_hostname, -status);
2443 nfs4_end_drain_session(clp);
2444 nfs4_clear_state_manager_bit(clp);
2447 static int nfs4_run_state_manager(void *ptr)
2449 struct nfs_client *clp = ptr;
2451 allow_signal(SIGKILL);
2452 nfs4_state_manager(clp);
2453 nfs_put_client(clp);
2454 module_put_and_exit(0);