4 * Client-side XDR for NFSv4.
6 * Copyright (c) 2002 The Regents of the University of Michigan.
9 * Kendrick Smith <kmsmith@umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
41 #include <linux/kernel.h>
42 #include <linux/slab.h>
44 #include <linux/nfs_fs.h>
45 #include <linux/kthread.h>
46 #include <linux/module.h>
47 #include <linux/random.h>
48 #include <linux/ratelimit.h>
49 #include <linux/workqueue.h>
50 #include <linux/bitops.h>
51 #include <linux/jiffies.h>
53 #include <linux/sunrpc/clnt.h>
57 #include "delegation.h"
59 #include "nfs4idmap.h"
60 #include "nfs4session.h"
64 #define NFSDBG_FACILITY NFSDBG_STATE
66 #define OPENOWNER_POOL_SIZE 8
68 const nfs4_stateid zero_stateid = {
70 .type = NFS4_SPECIAL_STATEID_TYPE,
72 const nfs4_stateid invalid_stateid = {
74 /* Funky initialiser keeps older gcc versions happy */
75 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
77 .type = NFS4_INVALID_STATEID_TYPE,
80 const nfs4_stateid current_stateid = {
82 /* Funky initialiser keeps older gcc versions happy */
83 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
85 .type = NFS4_SPECIAL_STATEID_TYPE,
88 static DEFINE_MUTEX(nfs_clid_init_mutex);
90 int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
92 struct nfs4_setclientid_res clid = {
93 .clientid = clp->cl_clientid,
94 .confirm = clp->cl_confirm,
98 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
100 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
102 port = nn->nfs_callback_tcpport;
103 if (clp->cl_addr.ss_family == AF_INET6)
104 port = nn->nfs_callback_tcpport6;
106 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
109 clp->cl_clientid = clid.clientid;
110 clp->cl_confirm = clid.confirm;
111 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
113 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
116 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
117 nfs4_schedule_state_renewal(clp);
123 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
125 * @clp: nfs_client under test
126 * @result: OUT: found nfs_client, or clp
127 * @cred: credential to use for trunking test
129 * Returns zero, a negative errno, or a negative NFS4ERR status.
130 * If zero is returned, an nfs_client pointer is planted in
133 * Note: The returned client may not yet be marked ready.
135 int nfs40_discover_server_trunking(struct nfs_client *clp,
136 struct nfs_client **result,
137 const struct cred *cred)
139 struct nfs4_setclientid_res clid = {
140 .clientid = clp->cl_clientid,
141 .confirm = clp->cl_confirm,
143 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
147 port = nn->nfs_callback_tcpport;
148 if (clp->cl_addr.ss_family == AF_INET6)
149 port = nn->nfs_callback_tcpport6;
151 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
154 clp->cl_clientid = clid.clientid;
155 clp->cl_confirm = clid.confirm;
157 status = nfs40_walk_client_list(clp, result, cred);
159 /* Sustain the lease, even if it's empty. If the clientid4
160 * goes stale it's of no use for trunking discovery. */
161 nfs4_schedule_state_renewal(*result);
163 /* If the client state need to recover, do it. */
165 nfs4_schedule_state_manager(clp);
171 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
173 return get_cred(rpc_machine_cred());
176 static void nfs4_root_machine_cred(struct nfs_client *clp)
179 /* Force root creds instead of machine */
180 clp->cl_principal = NULL;
181 clp->cl_rpcclient->cl_principal = NULL;
184 static const struct cred *
185 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
187 const struct cred *cred = NULL;
188 struct nfs4_state_owner *sp;
191 for (pos = rb_first(&server->state_owners);
193 pos = rb_next(pos)) {
194 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
195 if (list_empty(&sp->so_states))
197 cred = get_cred(sp->so_cred);
204 * nfs4_get_renew_cred - Acquire credential for a renew operation
205 * @clp: client state handle
207 * Returns an rpc_cred with reference count bumped, or NULL.
208 * Caller must hold clp->cl_lock.
210 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
212 const struct cred *cred = NULL;
213 struct nfs_server *server;
215 /* Use machine credentials if available */
216 cred = nfs4_get_machine_cred(clp);
220 spin_lock(&clp->cl_lock);
222 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
223 cred = nfs4_get_renew_cred_server_locked(server);
228 spin_unlock(&clp->cl_lock);
234 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
236 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
237 spin_lock(&tbl->slot_tbl_lock);
238 nfs41_wake_slot_table(tbl);
239 spin_unlock(&tbl->slot_tbl_lock);
243 static void nfs4_end_drain_session(struct nfs_client *clp)
245 struct nfs4_session *ses = clp->cl_session;
247 if (clp->cl_slot_tbl) {
248 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
253 nfs4_end_drain_slot_table(&ses->bc_slot_table);
254 nfs4_end_drain_slot_table(&ses->fc_slot_table);
258 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
260 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
261 spin_lock(&tbl->slot_tbl_lock);
262 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
263 reinit_completion(&tbl->complete);
264 spin_unlock(&tbl->slot_tbl_lock);
265 return wait_for_completion_interruptible(&tbl->complete);
267 spin_unlock(&tbl->slot_tbl_lock);
271 static int nfs4_begin_drain_session(struct nfs_client *clp)
273 struct nfs4_session *ses = clp->cl_session;
276 if (clp->cl_slot_tbl)
277 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
280 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
284 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
287 #if defined(CONFIG_NFS_V4_1)
289 static int nfs41_setup_state_renewal(struct nfs_client *clp)
292 struct nfs_fsinfo fsinfo;
295 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
296 nfs4_schedule_state_renewal(clp);
301 status = nfs4_proc_get_lease_time(clp, &fsinfo);
303 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
304 nfs4_schedule_state_renewal(clp);
310 static void nfs41_finish_session_reset(struct nfs_client *clp)
312 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
313 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
314 /* create_session negotiated new slot table */
315 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
316 nfs41_setup_state_renewal(clp);
319 int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
323 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
325 status = nfs4_proc_exchange_id(clp, cred);
328 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
330 status = nfs4_proc_create_session(clp, cred);
333 nfs41_finish_session_reset(clp);
334 nfs_mark_client_ready(clp, NFS_CS_READY);
340 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
342 * @clp: nfs_client under test
343 * @result: OUT: found nfs_client, or clp
344 * @cred: credential to use for trunking test
346 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
347 * If NFS4_OK is returned, an nfs_client pointer is planted in
350 * Note: The returned client may not yet be marked ready.
352 int nfs41_discover_server_trunking(struct nfs_client *clp,
353 struct nfs_client **result,
354 const struct cred *cred)
358 status = nfs4_proc_exchange_id(clp, cred);
359 if (status != NFS4_OK)
362 status = nfs41_walk_client_list(clp, result, cred);
369 * Purge state if the client id was established in a prior
370 * instance and the client id could not have arrived on the
371 * server via Transparent State Migration.
373 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
374 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
375 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
377 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
379 nfs4_schedule_state_manager(clp);
380 status = nfs_wait_client_init_complete(clp);
386 #endif /* CONFIG_NFS_V4_1 */
389 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
390 * @clp: client state handle
392 * Returns a cred with reference count bumped, or NULL.
394 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
396 const struct cred *cred;
398 cred = nfs4_get_machine_cred(clp);
402 static struct nfs4_state_owner *
403 nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
405 struct rb_node **p = &server->state_owners.rb_node,
407 struct nfs4_state_owner *sp;
412 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
413 cmp = cred_fscmp(cred, sp->so_cred);
416 p = &parent->rb_left;
418 p = &parent->rb_right;
420 if (!list_empty(&sp->so_lru))
421 list_del_init(&sp->so_lru);
422 atomic_inc(&sp->so_count);
429 static struct nfs4_state_owner *
430 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
432 struct nfs_server *server = new->so_server;
433 struct rb_node **p = &server->state_owners.rb_node,
435 struct nfs4_state_owner *sp;
440 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
441 cmp = cred_fscmp(new->so_cred, sp->so_cred);
444 p = &parent->rb_left;
446 p = &parent->rb_right;
448 if (!list_empty(&sp->so_lru))
449 list_del_init(&sp->so_lru);
450 atomic_inc(&sp->so_count);
454 rb_link_node(&new->so_server_node, parent, p);
455 rb_insert_color(&new->so_server_node, &server->state_owners);
460 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
462 struct nfs_server *server = sp->so_server;
464 if (!RB_EMPTY_NODE(&sp->so_server_node))
465 rb_erase(&sp->so_server_node, &server->state_owners);
469 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
471 sc->create_time = ktime_get();
474 spin_lock_init(&sc->lock);
475 INIT_LIST_HEAD(&sc->list);
476 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
480 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
482 rpc_destroy_wait_queue(&sc->wait);
486 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
487 * create a new state_owner.
490 static struct nfs4_state_owner *
491 nfs4_alloc_state_owner(struct nfs_server *server,
492 const struct cred *cred,
495 struct nfs4_state_owner *sp;
497 sp = kzalloc(sizeof(*sp), gfp_flags);
500 sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0,
502 if (sp->so_seqid.owner_id < 0) {
506 sp->so_server = server;
507 sp->so_cred = get_cred(cred);
508 spin_lock_init(&sp->so_lock);
509 INIT_LIST_HEAD(&sp->so_states);
510 nfs4_init_seqid_counter(&sp->so_seqid);
511 atomic_set(&sp->so_count, 1);
512 INIT_LIST_HEAD(&sp->so_lru);
513 seqcount_init(&sp->so_reclaim_seqcount);
514 mutex_init(&sp->so_delegreturn_mutex);
519 nfs4_reset_state_owner(struct nfs4_state_owner *sp)
521 /* This state_owner is no longer usable, but must
522 * remain in place so that state recovery can find it
523 * and the opens associated with it.
524 * It may also be used for new 'open' request to
525 * return a delegation to the server.
526 * So update the 'create_time' so that it looks like
527 * a new state_owner. This will cause the server to
528 * request an OPEN_CONFIRM to start a new sequence.
530 sp->so_seqid.create_time = ktime_get();
533 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
535 nfs4_destroy_seqid_counter(&sp->so_seqid);
536 put_cred(sp->so_cred);
537 ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
541 static void nfs4_gc_state_owners(struct nfs_server *server)
543 struct nfs_client *clp = server->nfs_client;
544 struct nfs4_state_owner *sp, *tmp;
545 unsigned long time_min, time_max;
548 spin_lock(&clp->cl_lock);
550 time_min = (long)time_max - (long)clp->cl_lease_time;
551 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
552 /* NB: LRU is sorted so that oldest is at the head */
553 if (time_in_range(sp->so_expires, time_min, time_max))
555 list_move(&sp->so_lru, &doomed);
556 nfs4_remove_state_owner_locked(sp);
558 spin_unlock(&clp->cl_lock);
560 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
561 list_del(&sp->so_lru);
562 nfs4_free_state_owner(sp);
567 * nfs4_get_state_owner - Look up a state owner given a credential
568 * @server: nfs_server to search
569 * @cred: RPC credential to match
570 * @gfp_flags: allocation mode
572 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
574 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
575 const struct cred *cred,
578 struct nfs_client *clp = server->nfs_client;
579 struct nfs4_state_owner *sp, *new;
581 spin_lock(&clp->cl_lock);
582 sp = nfs4_find_state_owner_locked(server, cred);
583 spin_unlock(&clp->cl_lock);
586 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
589 spin_lock(&clp->cl_lock);
590 sp = nfs4_insert_state_owner_locked(new);
591 spin_unlock(&clp->cl_lock);
593 nfs4_free_state_owner(new);
595 nfs4_gc_state_owners(server);
600 * nfs4_put_state_owner - Release a nfs4_state_owner
601 * @sp: state owner data to release
603 * Note that we keep released state owners on an LRU
605 * This caches valid state owners so that they can be
606 * reused, to avoid the OPEN_CONFIRM on minor version 0.
607 * It also pins the uniquifier of dropped state owners for
608 * a while, to ensure that those state owner names are
611 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
613 struct nfs_server *server = sp->so_server;
614 struct nfs_client *clp = server->nfs_client;
616 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
619 sp->so_expires = jiffies;
620 list_add_tail(&sp->so_lru, &server->state_owners_lru);
621 spin_unlock(&clp->cl_lock);
625 * nfs4_purge_state_owners - Release all cached state owners
626 * @server: nfs_server with cached state owners to release
628 * Called at umount time. Remaining state owners will be on
629 * the LRU with ref count of zero.
631 void nfs4_purge_state_owners(struct nfs_server *server)
633 struct nfs_client *clp = server->nfs_client;
634 struct nfs4_state_owner *sp, *tmp;
637 spin_lock(&clp->cl_lock);
638 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
639 list_move(&sp->so_lru, &doomed);
640 nfs4_remove_state_owner_locked(sp);
642 spin_unlock(&clp->cl_lock);
644 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
645 list_del(&sp->so_lru);
646 nfs4_free_state_owner(sp);
650 static struct nfs4_state *
651 nfs4_alloc_open_state(void)
653 struct nfs4_state *state;
655 state = kzalloc(sizeof(*state), GFP_NOFS);
658 refcount_set(&state->count, 1);
659 INIT_LIST_HEAD(&state->lock_states);
660 spin_lock_init(&state->state_lock);
661 seqlock_init(&state->seqlock);
662 init_waitqueue_head(&state->waitq);
667 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
669 if (state->state == fmode)
671 /* NB! List reordering - see the reclaim code for why. */
672 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
673 if (fmode & FMODE_WRITE)
674 list_move(&state->open_states, &state->owner->so_states);
676 list_move_tail(&state->open_states, &state->owner->so_states);
678 state->state = fmode;
681 static struct nfs4_state *
682 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
684 struct nfs_inode *nfsi = NFS_I(inode);
685 struct nfs4_state *state;
687 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
688 if (state->owner != owner)
690 if (!nfs4_valid_open_stateid(state))
692 if (refcount_inc_not_zero(&state->count))
699 nfs4_free_open_state(struct nfs4_state *state)
701 kfree_rcu(state, rcu_head);
705 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
707 struct nfs4_state *state, *new;
708 struct nfs_inode *nfsi = NFS_I(inode);
711 state = __nfs4_find_state_byowner(inode, owner);
715 new = nfs4_alloc_open_state();
716 spin_lock(&owner->so_lock);
717 spin_lock(&inode->i_lock);
718 state = __nfs4_find_state_byowner(inode, owner);
719 if (state == NULL && new != NULL) {
721 state->owner = owner;
722 atomic_inc(&owner->so_count);
723 list_add_rcu(&state->inode_states, &nfsi->open_states);
725 state->inode = inode;
726 spin_unlock(&inode->i_lock);
727 /* Note: The reclaim code dictates that we add stateless
728 * and read-only stateids to the end of the list */
729 list_add_tail(&state->open_states, &owner->so_states);
730 spin_unlock(&owner->so_lock);
732 spin_unlock(&inode->i_lock);
733 spin_unlock(&owner->so_lock);
735 nfs4_free_open_state(new);
741 void nfs4_put_open_state(struct nfs4_state *state)
743 struct inode *inode = state->inode;
744 struct nfs4_state_owner *owner = state->owner;
746 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
748 spin_lock(&inode->i_lock);
749 list_del_rcu(&state->inode_states);
750 list_del(&state->open_states);
751 spin_unlock(&inode->i_lock);
752 spin_unlock(&owner->so_lock);
754 nfs4_free_open_state(state);
755 nfs4_put_state_owner(owner);
759 * Close the current file.
761 static void __nfs4_close(struct nfs4_state *state,
762 fmode_t fmode, gfp_t gfp_mask, int wait)
764 struct nfs4_state_owner *owner = state->owner;
768 atomic_inc(&owner->so_count);
769 /* Protect against nfs4_find_state() */
770 spin_lock(&owner->so_lock);
771 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
778 case FMODE_READ|FMODE_WRITE:
781 newstate = FMODE_READ|FMODE_WRITE;
782 if (state->n_rdwr == 0) {
783 if (state->n_rdonly == 0) {
784 newstate &= ~FMODE_READ;
785 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
786 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
788 if (state->n_wronly == 0) {
789 newstate &= ~FMODE_WRITE;
790 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
791 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
794 clear_bit(NFS_DELEGATED_STATE, &state->flags);
796 nfs4_state_set_mode_locked(state, newstate);
797 spin_unlock(&owner->so_lock);
800 nfs4_put_open_state(state);
801 nfs4_put_state_owner(owner);
803 nfs4_do_close(state, gfp_mask, wait);
806 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
808 __nfs4_close(state, fmode, GFP_NOFS, 0);
811 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
813 __nfs4_close(state, fmode, GFP_KERNEL, 1);
817 * Search the state->lock_states for an existing lock_owner
818 * that is compatible with either of the given owners.
819 * If the second is non-zero, then the first refers to a Posix-lock
820 * owner (current->files) and the second refers to a flock/OFD
821 * owner (struct file*). In that case, prefer a match for the first
823 * If both sorts of locks are held on the one file we cannot know
824 * which stateid was intended to be used, so a "correct" choice cannot
825 * be made. Failing that, a "consistent" choice is preferable. The
826 * consistent choice we make is to prefer the first owner, that of a
829 static struct nfs4_lock_state *
830 __nfs4_find_lock_state(struct nfs4_state *state,
831 fl_owner_t fl_owner, fl_owner_t fl_owner2)
833 struct nfs4_lock_state *pos, *ret = NULL;
834 list_for_each_entry(pos, &state->lock_states, ls_locks) {
835 if (pos->ls_owner == fl_owner) {
839 if (pos->ls_owner == fl_owner2)
843 refcount_inc(&ret->ls_count);
848 * Return a compatible lock_state. If no initialized lock_state structure
849 * exists, return an uninitialized one.
852 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
854 struct nfs4_lock_state *lsp;
855 struct nfs_server *server = state->owner->so_server;
857 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
860 nfs4_init_seqid_counter(&lsp->ls_seqid);
861 refcount_set(&lsp->ls_count, 1);
862 lsp->ls_state = state;
863 lsp->ls_owner = fl_owner;
864 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
865 if (lsp->ls_seqid.owner_id < 0)
867 INIT_LIST_HEAD(&lsp->ls_locks);
874 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
876 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
877 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
882 * Return a compatible lock_state. If no initialized lock_state structure
883 * exists, return an uninitialized one.
886 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
888 struct nfs4_lock_state *lsp, *new = NULL;
891 spin_lock(&state->state_lock);
892 lsp = __nfs4_find_lock_state(state, owner, NULL);
896 list_add(&new->ls_locks, &state->lock_states);
897 set_bit(LK_STATE_IN_USE, &state->flags);
902 spin_unlock(&state->state_lock);
903 new = nfs4_alloc_lock_state(state, owner);
907 spin_unlock(&state->state_lock);
909 nfs4_free_lock_state(state->owner->so_server, new);
914 * Release reference to lock_state, and free it if we see that
915 * it is no longer in use
917 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
919 struct nfs_server *server;
920 struct nfs4_state *state;
924 state = lsp->ls_state;
925 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
927 list_del(&lsp->ls_locks);
928 if (list_empty(&state->lock_states))
929 clear_bit(LK_STATE_IN_USE, &state->flags);
930 spin_unlock(&state->state_lock);
931 server = state->owner->so_server;
932 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
933 struct nfs_client *clp = server->nfs_client;
935 clp->cl_mvops->free_lock_state(server, lsp);
937 nfs4_free_lock_state(server, lsp);
940 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
942 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
944 dst->fl_u.nfs4_fl.owner = lsp;
945 refcount_inc(&lsp->ls_count);
948 static void nfs4_fl_release_lock(struct file_lock *fl)
950 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
953 static const struct file_lock_operations nfs4_fl_lock_ops = {
954 .fl_copy_lock = nfs4_fl_copy_lock,
955 .fl_release_private = nfs4_fl_release_lock,
958 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
960 struct nfs4_lock_state *lsp;
962 if (fl->fl_ops != NULL)
964 lsp = nfs4_get_lock_state(state, fl->fl_owner);
967 fl->fl_u.nfs4_fl.owner = lsp;
968 fl->fl_ops = &nfs4_fl_lock_ops;
972 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
973 struct nfs4_state *state,
974 const struct nfs_lock_context *l_ctx)
976 struct nfs4_lock_state *lsp;
977 fl_owner_t fl_owner, fl_flock_owner;
983 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
986 fl_owner = l_ctx->lockowner;
987 fl_flock_owner = l_ctx->open_context->flock_owner;
989 spin_lock(&state->state_lock);
990 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
991 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
993 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
994 nfs4_stateid_copy(dst, &lsp->ls_stateid);
997 spin_unlock(&state->state_lock);
998 nfs4_put_lock_state(lsp);
1003 bool nfs4_refresh_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1010 seq = read_seqbegin(&state->seqlock);
1011 if (nfs4_state_match_open_stateid_other(state, dst)) {
1012 dst->seqid = state->open_stateid.seqid;
1015 } while (read_seqretry(&state->seqlock, seq));
1019 bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1022 const nfs4_stateid *src;
1027 src = &zero_stateid;
1028 seq = read_seqbegin(&state->seqlock);
1029 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1030 src = &state->open_stateid;
1033 nfs4_stateid_copy(dst, src);
1034 } while (read_seqretry(&state->seqlock, seq));
1039 * Byte-range lock aware utility to initialize the stateid of read/write
1042 int nfs4_select_rw_stateid(struct nfs4_state *state,
1043 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1044 nfs4_stateid *dst, const struct cred **cred)
1048 if (!nfs4_valid_open_stateid(state))
1052 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1054 /* A lost lock - don't even consider delegations */
1056 /* returns true if delegation stateid found and copied */
1057 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1062 /* nfs4_copy_delegation_stateid() didn't over-write
1063 * dst, so it still has the lock stateid which we now
1067 nfs4_copy_open_stateid(dst, state);
1070 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1075 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1077 struct nfs_seqid *new;
1079 new = kmalloc(sizeof(*new), gfp_mask);
1081 return ERR_PTR(-ENOMEM);
1082 new->sequence = counter;
1083 INIT_LIST_HEAD(&new->list);
1088 void nfs_release_seqid(struct nfs_seqid *seqid)
1090 struct nfs_seqid_counter *sequence;
1092 if (seqid == NULL || list_empty(&seqid->list))
1094 sequence = seqid->sequence;
1095 spin_lock(&sequence->lock);
1096 list_del_init(&seqid->list);
1097 if (!list_empty(&sequence->list)) {
1098 struct nfs_seqid *next;
1100 next = list_first_entry(&sequence->list,
1101 struct nfs_seqid, list);
1102 rpc_wake_up_queued_task(&sequence->wait, next->task);
1104 spin_unlock(&sequence->lock);
1107 void nfs_free_seqid(struct nfs_seqid *seqid)
1109 nfs_release_seqid(seqid);
1114 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1115 * failed with a seqid incrementing error -
1116 * see comments nfs4.h:seqid_mutating_error()
1118 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1123 case -NFS4ERR_BAD_SEQID:
1124 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1126 pr_warn_ratelimited("NFS: v4 server returned a bad"
1127 " sequence-id error on an"
1128 " unconfirmed sequence %p!\n",
1130 case -NFS4ERR_STALE_CLIENTID:
1131 case -NFS4ERR_STALE_STATEID:
1132 case -NFS4ERR_BAD_STATEID:
1133 case -NFS4ERR_BADXDR:
1134 case -NFS4ERR_RESOURCE:
1135 case -NFS4ERR_NOFILEHANDLE:
1136 case -NFS4ERR_MOVED:
1137 /* Non-seqid mutating errors */
1141 * Note: no locking needed as we are guaranteed to be first
1142 * on the sequence list
1144 seqid->sequence->counter++;
1147 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1149 struct nfs4_state_owner *sp;
1154 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1155 if (status == -NFS4ERR_BAD_SEQID)
1156 nfs4_reset_state_owner(sp);
1157 if (!nfs4_has_session(sp->so_server->nfs_client))
1158 nfs_increment_seqid(status, seqid);
1162 * Increment the seqid if the LOCK/LOCKU succeeded, or
1163 * failed with a seqid incrementing error -
1164 * see comments nfs4.h:seqid_mutating_error()
1166 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1169 nfs_increment_seqid(status, seqid);
1172 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1174 struct nfs_seqid_counter *sequence;
1179 sequence = seqid->sequence;
1180 spin_lock(&sequence->lock);
1182 if (list_empty(&seqid->list))
1183 list_add_tail(&seqid->list, &sequence->list);
1184 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1186 rpc_sleep_on(&sequence->wait, task, NULL);
1189 spin_unlock(&sequence->lock);
1194 static int nfs4_run_state_manager(void *);
1196 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1198 smp_mb__before_atomic();
1199 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1200 smp_mb__after_atomic();
1201 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1202 rpc_wake_up(&clp->cl_rpcwaitq);
1206 * Schedule the nfs_client asynchronous state management routine
1208 void nfs4_schedule_state_manager(struct nfs_client *clp)
1210 struct task_struct *task;
1211 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1213 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1214 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1216 __module_get(THIS_MODULE);
1217 refcount_inc(&clp->cl_count);
1219 /* The rcu_read_lock() is not strictly necessary, as the state
1220 * manager is the only thread that ever changes the rpc_xprt
1221 * after it's initialized. At this point, we're single threaded. */
1223 snprintf(buf, sizeof(buf), "%s-manager",
1224 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1226 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1228 printk(KERN_ERR "%s: kthread_run: %ld\n",
1229 __func__, PTR_ERR(task));
1230 nfs4_clear_state_manager_bit(clp);
1231 nfs_put_client(clp);
1232 module_put(THIS_MODULE);
1237 * Schedule a lease recovery attempt
1239 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1243 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1244 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1245 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1247 nfs4_schedule_state_manager(clp);
1249 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1252 * nfs4_schedule_migration_recovery - trigger migration recovery
1254 * @server: FSID that is migrating
1256 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1257 * value is returned.
1259 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1261 struct nfs_client *clp = server->nfs_client;
1263 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1264 pr_err("NFS: volatile file handles not supported (server %s)\n",
1269 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1272 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1274 (unsigned long long)server->fsid.major,
1275 (unsigned long long)server->fsid.minor,
1278 set_bit(NFS_MIG_IN_TRANSITION,
1279 &((struct nfs_server *)server)->mig_status);
1280 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1282 nfs4_schedule_state_manager(clp);
1285 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1288 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1290 * @clp: server to check for moved leases
1293 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1295 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1296 __func__, clp->cl_clientid, clp->cl_hostname);
1298 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1299 nfs4_schedule_state_manager(clp);
1301 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1303 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1309 refcount_inc(&clp->cl_count);
1310 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1311 nfs_wait_bit_killable, TASK_KILLABLE);
1314 if (clp->cl_cons_state < 0)
1315 res = clp->cl_cons_state;
1317 nfs_put_client(clp);
1321 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1326 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1327 ret = nfs4_wait_clnt_recover(clp);
1330 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1331 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1333 nfs4_schedule_state_manager(clp);
1340 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1341 * @clp: client to process
1343 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1344 * resend of the SETCLIENTID and hence re-establish the
1345 * callback channel. Then return all existing delegations.
1347 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1349 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1350 nfs_expire_all_delegations(clp);
1351 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1355 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1357 nfs40_handle_cb_pathdown(clp);
1358 nfs4_schedule_state_manager(clp);
1361 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1364 if (!nfs4_valid_open_stateid(state))
1366 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1367 /* Don't recover state that expired before the reboot */
1368 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1369 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1372 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1373 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1377 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1379 if (!nfs4_valid_open_stateid(state))
1381 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1382 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1383 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1384 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1388 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1390 struct nfs_client *clp = server->nfs_client;
1392 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1394 nfs_inode_find_delegation_state_and_recover(state->inode,
1396 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1398 nfs4_schedule_state_manager(clp);
1401 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1403 static struct nfs4_lock_state *
1404 nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1405 const nfs4_stateid *stateid)
1407 struct nfs4_lock_state *pos;
1409 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1410 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1412 if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
1418 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1419 const nfs4_stateid *stateid)
1423 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1424 spin_lock(&state->state_lock);
1425 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1427 spin_unlock(&state->state_lock);
1432 void nfs_inode_find_state_and_recover(struct inode *inode,
1433 const nfs4_stateid *stateid)
1435 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1436 struct nfs_inode *nfsi = NFS_I(inode);
1437 struct nfs_open_context *ctx;
1438 struct nfs4_state *state;
1442 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1446 if (nfs4_stateid_match_other(&state->stateid, stateid) &&
1447 nfs4_state_mark_reclaim_nograce(clp, state)) {
1451 if (nfs4_stateid_match_other(&state->open_stateid, stateid) &&
1452 nfs4_state_mark_reclaim_nograce(clp, state)) {
1456 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1457 nfs4_state_mark_reclaim_nograce(clp, state))
1462 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1464 nfs4_schedule_state_manager(clp);
1467 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1469 struct inode *inode = state->inode;
1470 struct nfs_inode *nfsi = NFS_I(inode);
1471 struct nfs_open_context *ctx;
1474 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1475 if (ctx->state != state)
1477 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1482 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1484 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1485 nfs4_state_mark_open_context_bad(state);
1489 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1491 struct inode *inode = state->inode;
1492 struct nfs_inode *nfsi = NFS_I(inode);
1493 struct file_lock *fl;
1494 struct nfs4_lock_state *lsp;
1496 struct file_lock_context *flctx = inode->i_flctx;
1497 struct list_head *list;
1502 list = &flctx->flc_posix;
1504 /* Guard against delegation returns and new lock/unlock calls */
1505 down_write(&nfsi->rwsem);
1506 spin_lock(&flctx->flc_lock);
1508 list_for_each_entry(fl, list, fl_list) {
1509 if (nfs_file_open_context(fl->fl_file)->state != state)
1511 spin_unlock(&flctx->flc_lock);
1512 status = ops->recover_lock(state, fl);
1517 case -NFS4ERR_ADMIN_REVOKED:
1518 case -NFS4ERR_STALE_STATEID:
1519 case -NFS4ERR_BAD_STATEID:
1520 case -NFS4ERR_EXPIRED:
1521 case -NFS4ERR_NO_GRACE:
1522 case -NFS4ERR_STALE_CLIENTID:
1523 case -NFS4ERR_BADSESSION:
1524 case -NFS4ERR_BADSLOT:
1525 case -NFS4ERR_BAD_HIGH_SLOT:
1526 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1529 pr_err("NFS: %s: unhandled error %d\n",
1533 case -NFS4ERR_DENIED:
1534 case -NFS4ERR_RECLAIM_BAD:
1535 case -NFS4ERR_RECLAIM_CONFLICT:
1536 lsp = fl->fl_u.nfs4_fl.owner;
1538 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1541 spin_lock(&flctx->flc_lock);
1543 if (list == &flctx->flc_posix) {
1544 list = &flctx->flc_flock;
1547 spin_unlock(&flctx->flc_lock);
1549 up_write(&nfsi->rwsem);
1553 #ifdef CONFIG_NFS_V4_2
1554 static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1556 struct nfs4_copy_state *copy;
1558 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags))
1561 spin_lock(&sp->so_server->nfs_client->cl_lock);
1562 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1563 if (!nfs4_stateid_match_other(&state->stateid, ©->parent_state->stateid))
1566 complete(©->completion);
1569 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1571 #else /* !CONFIG_NFS_V4_2 */
1572 static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1573 struct nfs4_state *state)
1576 #endif /* CONFIG_NFS_V4_2 */
1578 static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1579 const struct nfs4_state_recovery_ops *ops)
1581 struct nfs4_lock_state *lock;
1584 status = ops->recover_open(sp, state);
1588 status = nfs4_reclaim_locks(state, ops);
1592 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1593 spin_lock(&state->state_lock);
1594 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1595 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1596 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__);
1598 spin_unlock(&state->state_lock);
1601 nfs42_complete_copies(sp, state);
1602 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1606 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1608 struct nfs4_state *state;
1611 /* Note: we rely on the sp->so_states list being ordered
1612 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1614 * This is needed to ensure that the server won't give us any
1615 * read delegations that we have to return if, say, we are
1616 * recovering after a network partition or a reboot from a
1617 * server that doesn't support a grace period.
1619 spin_lock(&sp->so_lock);
1620 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1622 list_for_each_entry(state, &sp->so_states, open_states) {
1623 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1625 if (!nfs4_valid_open_stateid(state))
1627 if (state->state == 0)
1629 refcount_inc(&state->count);
1630 spin_unlock(&sp->so_lock);
1631 status = __nfs4_reclaim_open_state(sp, state, ops);
1637 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1645 /* Open state on this file cannot be recovered */
1646 nfs4_state_mark_recovery_failed(state, status);
1651 case -NFS4ERR_ADMIN_REVOKED:
1652 case -NFS4ERR_STALE_STATEID:
1653 case -NFS4ERR_OLD_STATEID:
1654 case -NFS4ERR_BAD_STATEID:
1655 case -NFS4ERR_RECLAIM_BAD:
1656 case -NFS4ERR_RECLAIM_CONFLICT:
1657 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1659 case -NFS4ERR_EXPIRED:
1660 case -NFS4ERR_NO_GRACE:
1661 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1662 case -NFS4ERR_STALE_CLIENTID:
1663 case -NFS4ERR_BADSESSION:
1664 case -NFS4ERR_BADSLOT:
1665 case -NFS4ERR_BAD_HIGH_SLOT:
1666 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1669 nfs4_put_open_state(state);
1670 spin_lock(&sp->so_lock);
1673 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1674 spin_unlock(&sp->so_lock);
1677 nfs4_put_open_state(state);
1678 spin_lock(&sp->so_lock);
1679 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1680 spin_unlock(&sp->so_lock);
1684 static void nfs4_clear_open_state(struct nfs4_state *state)
1686 struct nfs4_lock_state *lock;
1688 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1689 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1690 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1691 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1692 spin_lock(&state->state_lock);
1693 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1694 lock->ls_seqid.flags = 0;
1695 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1697 spin_unlock(&state->state_lock);
1700 static void nfs4_reset_seqids(struct nfs_server *server,
1701 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1703 struct nfs_client *clp = server->nfs_client;
1704 struct nfs4_state_owner *sp;
1705 struct rb_node *pos;
1706 struct nfs4_state *state;
1708 spin_lock(&clp->cl_lock);
1709 for (pos = rb_first(&server->state_owners);
1711 pos = rb_next(pos)) {
1712 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1713 sp->so_seqid.flags = 0;
1714 spin_lock(&sp->so_lock);
1715 list_for_each_entry(state, &sp->so_states, open_states) {
1716 if (mark_reclaim(clp, state))
1717 nfs4_clear_open_state(state);
1719 spin_unlock(&sp->so_lock);
1721 spin_unlock(&clp->cl_lock);
1724 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1725 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1727 struct nfs_server *server;
1730 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1731 nfs4_reset_seqids(server, mark_reclaim);
1735 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1737 /* Mark all delegations for reclaim */
1738 nfs_delegation_mark_reclaim(clp);
1739 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1742 static int nfs4_reclaim_complete(struct nfs_client *clp,
1743 const struct nfs4_state_recovery_ops *ops,
1744 const struct cred *cred)
1746 /* Notify the server we're done reclaiming our state */
1747 if (ops->reclaim_complete)
1748 return ops->reclaim_complete(clp, cred);
1752 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1754 struct nfs_client *clp = server->nfs_client;
1755 struct nfs4_state_owner *sp;
1756 struct rb_node *pos;
1757 struct nfs4_state *state;
1759 spin_lock(&clp->cl_lock);
1760 for (pos = rb_first(&server->state_owners);
1762 pos = rb_next(pos)) {
1763 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1764 spin_lock(&sp->so_lock);
1765 list_for_each_entry(state, &sp->so_states, open_states) {
1766 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1769 nfs4_state_mark_reclaim_nograce(clp, state);
1771 spin_unlock(&sp->so_lock);
1773 spin_unlock(&clp->cl_lock);
1776 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1778 struct nfs_server *server;
1780 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1784 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1785 nfs4_clear_reclaim_server(server);
1788 nfs_delegation_reap_unclaimed(clp);
1792 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1794 const struct nfs4_state_recovery_ops *ops;
1795 const struct cred *cred;
1798 if (!nfs4_state_clear_reclaim_reboot(clp))
1800 ops = clp->cl_mvops->reboot_recovery_ops;
1801 cred = nfs4_get_clid_cred(clp);
1802 err = nfs4_reclaim_complete(clp, ops, cred);
1804 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1805 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1808 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1810 nfs_mark_test_expired_all_delegations(clp);
1811 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1814 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1819 case -NFS4ERR_CB_PATH_DOWN:
1820 nfs40_handle_cb_pathdown(clp);
1822 case -NFS4ERR_NO_GRACE:
1823 nfs4_state_end_reclaim_reboot(clp);
1825 case -NFS4ERR_STALE_CLIENTID:
1826 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1827 nfs4_state_start_reclaim_reboot(clp);
1829 case -NFS4ERR_EXPIRED:
1830 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1831 nfs4_state_start_reclaim_nograce(clp);
1833 case -NFS4ERR_BADSESSION:
1834 case -NFS4ERR_BADSLOT:
1835 case -NFS4ERR_BAD_HIGH_SLOT:
1836 case -NFS4ERR_DEADSESSION:
1837 case -NFS4ERR_SEQ_FALSE_RETRY:
1838 case -NFS4ERR_SEQ_MISORDERED:
1839 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1840 /* Zero session reset errors */
1842 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1843 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1846 dprintk("%s: failed to handle error %d for server %s\n",
1847 __func__, error, clp->cl_hostname);
1850 dprintk("%s: handled error %d for server %s\n", __func__, error,
1855 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1857 struct nfs4_state_owner *sp;
1858 struct nfs_server *server;
1859 struct rb_node *pos;
1864 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1865 nfs4_purge_state_owners(server);
1866 spin_lock(&clp->cl_lock);
1867 for (pos = rb_first(&server->state_owners);
1869 pos = rb_next(pos)) {
1871 struct nfs4_state_owner, so_server_node);
1872 if (!test_and_clear_bit(ops->owner_flag_bit,
1875 if (!atomic_inc_not_zero(&sp->so_count))
1877 spin_unlock(&clp->cl_lock);
1880 status = nfs4_reclaim_open_state(sp, ops);
1882 set_bit(ops->owner_flag_bit, &sp->so_flags);
1883 nfs4_put_state_owner(sp);
1884 status = nfs4_recovery_handle_error(clp, status);
1885 return (status != 0) ? status : -EAGAIN;
1888 nfs4_put_state_owner(sp);
1891 spin_unlock(&clp->cl_lock);
1897 static int nfs4_check_lease(struct nfs_client *clp)
1899 const struct cred *cred;
1900 const struct nfs4_state_maintenance_ops *ops =
1901 clp->cl_mvops->state_renewal_ops;
1904 /* Is the client already known to have an expired lease? */
1905 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1907 cred = ops->get_state_renewal_cred(clp);
1909 cred = nfs4_get_clid_cred(clp);
1914 status = ops->renew_lease(clp, cred);
1916 if (status == -ETIMEDOUT) {
1917 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1921 return nfs4_recovery_handle_error(clp, status);
1924 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1925 * and for recoverable errors on EXCHANGE_ID for v4.1
1927 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1930 case -NFS4ERR_SEQ_MISORDERED:
1931 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1932 return -ESERVERFAULT;
1933 /* Lease confirmation error: retry after purging the lease */
1935 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1937 case -NFS4ERR_STALE_CLIENTID:
1938 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1939 nfs4_state_start_reclaim_reboot(clp);
1941 case -NFS4ERR_CLID_INUSE:
1942 pr_err("NFS: Server %s reports our clientid is in use\n",
1944 nfs_mark_client_ready(clp, -EPERM);
1945 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1948 case -NFS4ERR_DELAY:
1954 case -NFS4ERR_MINOR_VERS_MISMATCH:
1955 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1956 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1957 dprintk("%s: exit with error %d for server %s\n",
1958 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1959 return -EPROTONOSUPPORT;
1960 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1961 * in nfs4_exchange_id */
1963 dprintk("%s: exit with error %d for server %s\n", __func__,
1964 status, clp->cl_hostname);
1967 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1968 dprintk("%s: handled error %d for server %s\n", __func__, status,
1973 static int nfs4_establish_lease(struct nfs_client *clp)
1975 const struct cred *cred;
1976 const struct nfs4_state_recovery_ops *ops =
1977 clp->cl_mvops->reboot_recovery_ops;
1980 status = nfs4_begin_drain_session(clp);
1983 cred = nfs4_get_clid_cred(clp);
1986 status = ops->establish_clid(clp, cred);
1990 pnfs_destroy_all_layouts(clp);
1995 * Returns zero or a negative errno. NFS4ERR values are converted
1996 * to local errno values.
1998 static int nfs4_reclaim_lease(struct nfs_client *clp)
2002 status = nfs4_establish_lease(clp);
2004 return nfs4_handle_reclaim_lease_error(clp, status);
2005 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2006 nfs4_state_start_reclaim_nograce(clp);
2007 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2008 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2009 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2010 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2014 static int nfs4_purge_lease(struct nfs_client *clp)
2018 status = nfs4_establish_lease(clp);
2020 return nfs4_handle_reclaim_lease_error(clp, status);
2021 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2022 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2023 nfs4_state_start_reclaim_nograce(clp);
2028 * Try remote migration of one FSID from a source server to a
2029 * destination server. The source server provides a list of
2030 * potential destinations.
2032 * Returns zero or a negative NFS4ERR status code.
2034 static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2036 struct nfs_client *clp = server->nfs_client;
2037 struct nfs4_fs_locations *locations = NULL;
2038 struct inode *inode;
2042 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2043 (unsigned long long)server->fsid.major,
2044 (unsigned long long)server->fsid.minor,
2048 page = alloc_page(GFP_KERNEL);
2049 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2050 if (page == NULL || locations == NULL) {
2051 dprintk("<-- %s: no memory\n", __func__);
2055 inode = d_inode(server->super->s_root);
2056 result = nfs4_proc_get_locations(inode, locations, page, cred);
2058 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2063 result = -NFS4ERR_NXIO;
2064 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2065 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2070 status = nfs4_begin_drain_session(clp);
2074 status = nfs4_replace_transport(server, locations);
2076 dprintk("<-- %s: failed to replace transport: %d\n",
2082 dprintk("<-- %s: migration succeeded\n", __func__);
2089 pr_err("NFS: migration recovery failed (server %s)\n",
2091 set_bit(NFS_MIG_FAILED, &server->mig_status);
2097 * Returns zero or a negative NFS4ERR status code.
2099 static int nfs4_handle_migration(struct nfs_client *clp)
2101 const struct nfs4_state_maintenance_ops *ops =
2102 clp->cl_mvops->state_renewal_ops;
2103 struct nfs_server *server;
2104 const struct cred *cred;
2106 dprintk("%s: migration reported on \"%s\"\n", __func__,
2109 cred = ops->get_state_renewal_cred(clp);
2111 return -NFS4ERR_NOENT;
2116 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2119 if (server->mig_gen == clp->cl_mig_gen)
2121 server->mig_gen = clp->cl_mig_gen;
2123 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2124 &server->mig_status))
2128 status = nfs4_try_migration(server, cred);
2141 * Test each nfs_server on the clp's cl_superblocks list to see
2142 * if it's moved to another server. Stop when the server no longer
2143 * returns NFS4ERR_LEASE_MOVED.
2145 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2147 const struct nfs4_state_maintenance_ops *ops =
2148 clp->cl_mvops->state_renewal_ops;
2149 struct nfs_server *server;
2150 const struct cred *cred;
2152 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2155 cred = ops->get_state_renewal_cred(clp);
2157 return -NFS4ERR_NOENT;
2162 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2163 struct inode *inode;
2166 if (server->mig_gen == clp->cl_mig_gen)
2168 server->mig_gen = clp->cl_mig_gen;
2172 inode = d_inode(server->super->s_root);
2173 status = nfs4_proc_fsid_present(inode, cred);
2174 if (status != -NFS4ERR_MOVED)
2175 goto restart; /* wasn't this one */
2176 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2177 goto restart; /* there are more */
2188 * nfs4_discover_server_trunking - Detect server IP address trunking
2190 * @clp: nfs_client under test
2191 * @result: OUT: found nfs_client, or clp
2193 * Returns zero or a negative errno. If zero is returned,
2194 * an nfs_client pointer is planted in "result".
2196 * Note: since we are invoked in process context, and
2197 * not from inside the state manager, we cannot use
2198 * nfs4_handle_reclaim_lease_error().
2200 int nfs4_discover_server_trunking(struct nfs_client *clp,
2201 struct nfs_client **result)
2203 const struct nfs4_state_recovery_ops *ops =
2204 clp->cl_mvops->reboot_recovery_ops;
2205 struct rpc_clnt *clnt;
2206 const struct cred *cred;
2209 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2211 clnt = clp->cl_rpcclient;
2214 mutex_lock(&nfs_clid_init_mutex);
2217 cred = nfs4_get_clid_cred(clp);
2221 status = ops->detect_trunking(clp, result, cred);
2229 if (clnt->cl_softrtry)
2232 case -NFS4ERR_DELAY:
2236 case -NFS4ERR_STALE_CLIENTID:
2237 dprintk("NFS: %s after status %d, retrying\n",
2242 nfs4_root_machine_cred(clp);
2245 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2248 case -NFS4ERR_CLID_INUSE:
2249 case -NFS4ERR_WRONGSEC:
2250 /* No point in retrying if we already used RPC_AUTH_UNIX */
2251 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2255 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2257 status = PTR_ERR(clnt);
2260 /* Note: this is safe because we haven't yet marked the
2261 * client as ready, so we are the only user of
2264 clnt = xchg(&clp->cl_rpcclient, clnt);
2265 rpc_shutdown_client(clnt);
2266 clnt = clp->cl_rpcclient;
2269 case -NFS4ERR_MINOR_VERS_MISMATCH:
2270 status = -EPROTONOSUPPORT;
2274 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2275 * in nfs4_exchange_id */
2276 status = -EKEYEXPIRED;
2279 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2285 mutex_unlock(&nfs_clid_init_mutex);
2286 dprintk("NFS: %s: status = %d\n", __func__, status);
2290 #ifdef CONFIG_NFS_V4_1
2291 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2293 struct nfs_client *clp = session->clp;
2297 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2299 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2300 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2302 nfs4_schedule_state_manager(clp);
2304 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2306 void nfs41_notify_server(struct nfs_client *clp)
2308 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2309 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2310 nfs4_schedule_state_manager(clp);
2313 static void nfs4_reset_all_state(struct nfs_client *clp)
2315 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2316 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2317 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2318 nfs4_state_start_reclaim_nograce(clp);
2319 dprintk("%s: scheduling reset of all state for server %s!\n",
2320 __func__, clp->cl_hostname);
2321 nfs4_schedule_state_manager(clp);
2325 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2327 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2328 nfs4_state_start_reclaim_reboot(clp);
2329 dprintk("%s: server %s rebooted!\n", __func__,
2331 nfs4_schedule_state_manager(clp);
2335 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2337 nfs4_reset_all_state(clp);
2338 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2341 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2343 nfs4_state_start_reclaim_nograce(clp);
2344 nfs4_schedule_state_manager(clp);
2346 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2349 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2351 /* FIXME: For now, we destroy all layouts. */
2352 pnfs_destroy_all_layouts(clp);
2353 nfs_test_expired_all_delegations(clp);
2354 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2358 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2360 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2361 nfs4_schedule_state_manager(clp);
2363 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2367 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2369 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2370 &clp->cl_state) == 0)
2371 nfs4_schedule_state_manager(clp);
2374 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2380 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2381 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2383 * If we're called from the state manager thread, then assume we're
2384 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2385 * Those flags are expected to remain set until we're done
2386 * recovering (see RFC5661, section 18.46.3).
2391 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2392 nfs41_handle_server_reboot(clp);
2393 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2394 nfs41_handle_all_state_revoked(clp);
2395 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2396 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2397 nfs41_handle_some_state_revoked(clp);
2398 if (flags & SEQ4_STATUS_LEASE_MOVED)
2399 nfs4_schedule_lease_moved_recovery(clp);
2400 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2401 nfs41_handle_recallable_state_revoked(clp);
2403 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2404 nfs41_handle_backchannel_fault(clp);
2405 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2406 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2407 nfs41_handle_cb_path_down(clp);
2410 static int nfs4_reset_session(struct nfs_client *clp)
2412 const struct cred *cred;
2415 if (!nfs4_has_session(clp))
2417 status = nfs4_begin_drain_session(clp);
2420 cred = nfs4_get_clid_cred(clp);
2421 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2424 case -NFS4ERR_BADSESSION:
2425 case -NFS4ERR_DEADSESSION:
2427 case -NFS4ERR_BACK_CHAN_BUSY:
2428 case -NFS4ERR_DELAY:
2429 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2434 status = nfs4_recovery_handle_error(clp, status);
2438 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2439 status = nfs4_proc_create_session(clp, cred);
2441 dprintk("%s: session reset failed with status %d for server %s!\n",
2442 __func__, status, clp->cl_hostname);
2443 status = nfs4_handle_reclaim_lease_error(clp, status);
2446 nfs41_finish_session_reset(clp);
2447 dprintk("%s: session reset was successful for server %s!\n",
2448 __func__, clp->cl_hostname);
2454 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2456 const struct cred *cred;
2459 if (!nfs4_has_session(clp))
2461 ret = nfs4_begin_drain_session(clp);
2464 cred = nfs4_get_clid_cred(clp);
2465 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2467 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2470 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2471 __func__, clp->cl_hostname);
2473 case -NFS4ERR_DELAY:
2475 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2478 return nfs4_recovery_handle_error(clp, ret);
2482 #else /* CONFIG_NFS_V4_1 */
2483 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2485 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2489 #endif /* CONFIG_NFS_V4_1 */
2491 static void nfs4_state_manager(struct nfs_client *clp)
2494 const char *section = "", *section_sep = "";
2496 /* Ensure exclusive access to NFSv4 state */
2498 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2499 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2500 section = "purge state";
2501 status = nfs4_purge_lease(clp);
2507 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2508 section = "lease expired";
2509 /* We're going to have to re-establish a clientid */
2510 status = nfs4_reclaim_lease(clp);
2516 /* Initialize or reset the session */
2517 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2518 section = "reset session";
2519 status = nfs4_reset_session(clp);
2520 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2526 /* Send BIND_CONN_TO_SESSION */
2527 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2529 section = "bind conn to session";
2530 status = nfs4_bind_conn_to_session(clp);
2536 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2537 section = "check lease";
2538 status = nfs4_check_lease(clp);
2544 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2545 section = "migration";
2546 status = nfs4_handle_migration(clp);
2551 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2552 section = "lease moved";
2553 status = nfs4_handle_lease_moved(clp);
2558 /* First recover reboot state... */
2559 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2560 section = "reclaim reboot";
2561 status = nfs4_do_reclaim(clp,
2562 clp->cl_mvops->reboot_recovery_ops);
2563 if (status == -EAGAIN)
2567 nfs4_state_end_reclaim_reboot(clp);
2570 /* Detect expired delegations... */
2571 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2572 section = "detect expired delegations";
2573 nfs_reap_expired_delegations(clp);
2577 /* Now recover expired state... */
2578 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2579 section = "reclaim nograce";
2580 status = nfs4_do_reclaim(clp,
2581 clp->cl_mvops->nograce_recovery_ops);
2582 if (status == -EAGAIN)
2588 nfs4_end_drain_session(clp);
2589 nfs4_clear_state_manager_bit(clp);
2591 if (!test_and_set_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state)) {
2592 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2593 nfs_client_return_marked_delegations(clp);
2594 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2596 clear_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state);
2599 /* Did we race with an attempt to give us more work? */
2600 if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
2602 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2604 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2608 if (strlen(section))
2610 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2611 " with error %d\n", section_sep, section,
2612 clp->cl_hostname, -status);
2615 nfs4_end_drain_session(clp);
2616 nfs4_clear_state_manager_bit(clp);
2619 static int nfs4_run_state_manager(void *ptr)
2621 struct nfs_client *clp = ptr;
2623 allow_signal(SIGKILL);
2624 nfs4_state_manager(clp);
2625 nfs_put_client(clp);
2626 module_put_and_exit(0);