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"
63 #include "nfs4trace.h"
65 #define NFSDBG_FACILITY NFSDBG_STATE
67 #define OPENOWNER_POOL_SIZE 8
69 const nfs4_stateid zero_stateid = {
71 .type = NFS4_SPECIAL_STATEID_TYPE,
73 const nfs4_stateid invalid_stateid = {
75 /* Funky initialiser keeps older gcc versions happy */
76 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
78 .type = NFS4_INVALID_STATEID_TYPE,
81 const nfs4_stateid current_stateid = {
83 /* Funky initialiser keeps older gcc versions happy */
84 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
86 .type = NFS4_SPECIAL_STATEID_TYPE,
89 static DEFINE_MUTEX(nfs_clid_init_mutex);
91 static int nfs4_setup_state_renewal(struct nfs_client *clp)
94 struct nfs_fsinfo fsinfo;
97 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
98 nfs4_schedule_state_renewal(clp);
103 status = nfs4_proc_get_lease_time(clp, &fsinfo);
105 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
106 nfs4_schedule_state_renewal(clp);
112 int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
114 struct nfs4_setclientid_res clid = {
115 .clientid = clp->cl_clientid,
116 .confirm = clp->cl_confirm,
120 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
122 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
124 port = nn->nfs_callback_tcpport;
125 if (clp->cl_addr.ss_family == AF_INET6)
126 port = nn->nfs_callback_tcpport6;
128 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
131 clp->cl_clientid = clid.clientid;
132 clp->cl_confirm = clid.confirm;
133 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
135 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
138 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
139 nfs4_setup_state_renewal(clp);
145 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
147 * @clp: nfs_client under test
148 * @result: OUT: found nfs_client, or clp
149 * @cred: credential to use for trunking test
151 * Returns zero, a negative errno, or a negative NFS4ERR status.
152 * If zero is returned, an nfs_client pointer is planted in
155 * Note: The returned client may not yet be marked ready.
157 int nfs40_discover_server_trunking(struct nfs_client *clp,
158 struct nfs_client **result,
159 const struct cred *cred)
161 struct nfs4_setclientid_res clid = {
162 .clientid = clp->cl_clientid,
163 .confirm = clp->cl_confirm,
165 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
169 port = nn->nfs_callback_tcpport;
170 if (clp->cl_addr.ss_family == AF_INET6)
171 port = nn->nfs_callback_tcpport6;
173 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
176 clp->cl_clientid = clid.clientid;
177 clp->cl_confirm = clid.confirm;
179 status = nfs40_walk_client_list(clp, result, cred);
181 /* Sustain the lease, even if it's empty. If the clientid4
182 * goes stale it's of no use for trunking discovery. */
183 nfs4_schedule_state_renewal(*result);
185 /* If the client state need to recover, do it. */
187 nfs4_schedule_state_manager(clp);
193 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
195 return get_cred(rpc_machine_cred());
198 static void nfs4_root_machine_cred(struct nfs_client *clp)
201 /* Force root creds instead of machine */
202 clp->cl_principal = NULL;
203 clp->cl_rpcclient->cl_principal = NULL;
206 static const struct cred *
207 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
209 const struct cred *cred = NULL;
210 struct nfs4_state_owner *sp;
213 for (pos = rb_first(&server->state_owners);
215 pos = rb_next(pos)) {
216 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
217 if (list_empty(&sp->so_states))
219 cred = get_cred(sp->so_cred);
226 * nfs4_get_renew_cred - Acquire credential for a renew operation
227 * @clp: client state handle
229 * Returns an rpc_cred with reference count bumped, or NULL.
230 * Caller must hold clp->cl_lock.
232 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
234 const struct cred *cred = NULL;
235 struct nfs_server *server;
237 /* Use machine credentials if available */
238 cred = nfs4_get_machine_cred(clp);
242 spin_lock(&clp->cl_lock);
244 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
245 cred = nfs4_get_renew_cred_server_locked(server);
250 spin_unlock(&clp->cl_lock);
256 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
258 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
259 spin_lock(&tbl->slot_tbl_lock);
260 nfs41_wake_slot_table(tbl);
261 spin_unlock(&tbl->slot_tbl_lock);
265 static void nfs4_end_drain_session(struct nfs_client *clp)
267 struct nfs4_session *ses = clp->cl_session;
269 if (clp->cl_slot_tbl) {
270 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
275 nfs4_end_drain_slot_table(&ses->bc_slot_table);
276 nfs4_end_drain_slot_table(&ses->fc_slot_table);
280 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
282 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
283 spin_lock(&tbl->slot_tbl_lock);
284 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
285 reinit_completion(&tbl->complete);
286 spin_unlock(&tbl->slot_tbl_lock);
287 return wait_for_completion_interruptible(&tbl->complete);
289 spin_unlock(&tbl->slot_tbl_lock);
293 static int nfs4_begin_drain_session(struct nfs_client *clp)
295 struct nfs4_session *ses = clp->cl_session;
298 if (clp->cl_slot_tbl)
299 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
302 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
306 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
309 #if defined(CONFIG_NFS_V4_1)
311 static void nfs41_finish_session_reset(struct nfs_client *clp)
313 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
314 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
315 /* create_session negotiated new slot table */
316 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
317 nfs4_setup_state_renewal(clp);
320 int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
324 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
326 status = nfs4_proc_exchange_id(clp, cred);
329 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
331 status = nfs4_proc_create_session(clp, cred);
334 nfs41_finish_session_reset(clp);
335 nfs_mark_client_ready(clp, NFS_CS_READY);
341 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
343 * @clp: nfs_client under test
344 * @result: OUT: found nfs_client, or clp
345 * @cred: credential to use for trunking test
347 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
348 * If NFS4_OK is returned, an nfs_client pointer is planted in
351 * Note: The returned client may not yet be marked ready.
353 int nfs41_discover_server_trunking(struct nfs_client *clp,
354 struct nfs_client **result,
355 const struct cred *cred)
359 status = nfs4_proc_exchange_id(clp, cred);
360 if (status != NFS4_OK)
363 status = nfs41_walk_client_list(clp, result, cred);
370 * Purge state if the client id was established in a prior
371 * instance and the client id could not have arrived on the
372 * server via Transparent State Migration.
374 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
375 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
376 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
378 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
380 nfs4_schedule_state_manager(clp);
381 status = nfs_wait_client_init_complete(clp);
387 #endif /* CONFIG_NFS_V4_1 */
390 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
391 * @clp: client state handle
393 * Returns a cred with reference count bumped, or NULL.
395 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
397 const struct cred *cred;
399 cred = nfs4_get_machine_cred(clp);
403 static struct nfs4_state_owner *
404 nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
406 struct rb_node **p = &server->state_owners.rb_node,
408 struct nfs4_state_owner *sp;
413 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
414 cmp = cred_fscmp(cred, sp->so_cred);
417 p = &parent->rb_left;
419 p = &parent->rb_right;
421 if (!list_empty(&sp->so_lru))
422 list_del_init(&sp->so_lru);
423 atomic_inc(&sp->so_count);
430 static struct nfs4_state_owner *
431 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
433 struct nfs_server *server = new->so_server;
434 struct rb_node **p = &server->state_owners.rb_node,
436 struct nfs4_state_owner *sp;
441 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
442 cmp = cred_fscmp(new->so_cred, sp->so_cred);
445 p = &parent->rb_left;
447 p = &parent->rb_right;
449 if (!list_empty(&sp->so_lru))
450 list_del_init(&sp->so_lru);
451 atomic_inc(&sp->so_count);
455 rb_link_node(&new->so_server_node, parent, p);
456 rb_insert_color(&new->so_server_node, &server->state_owners);
461 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
463 struct nfs_server *server = sp->so_server;
465 if (!RB_EMPTY_NODE(&sp->so_server_node))
466 rb_erase(&sp->so_server_node, &server->state_owners);
470 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
472 sc->create_time = ktime_get();
475 spin_lock_init(&sc->lock);
476 INIT_LIST_HEAD(&sc->list);
477 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
481 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
483 rpc_destroy_wait_queue(&sc->wait);
487 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
488 * create a new state_owner.
491 static struct nfs4_state_owner *
492 nfs4_alloc_state_owner(struct nfs_server *server,
493 const struct cred *cred,
496 struct nfs4_state_owner *sp;
498 sp = kzalloc(sizeof(*sp), gfp_flags);
501 sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0,
503 if (sp->so_seqid.owner_id < 0) {
507 sp->so_server = server;
508 sp->so_cred = get_cred(cred);
509 spin_lock_init(&sp->so_lock);
510 INIT_LIST_HEAD(&sp->so_states);
511 nfs4_init_seqid_counter(&sp->so_seqid);
512 atomic_set(&sp->so_count, 1);
513 INIT_LIST_HEAD(&sp->so_lru);
514 seqcount_init(&sp->so_reclaim_seqcount);
515 mutex_init(&sp->so_delegreturn_mutex);
520 nfs4_reset_state_owner(struct nfs4_state_owner *sp)
522 /* This state_owner is no longer usable, but must
523 * remain in place so that state recovery can find it
524 * and the opens associated with it.
525 * It may also be used for new 'open' request to
526 * return a delegation to the server.
527 * So update the 'create_time' so that it looks like
528 * a new state_owner. This will cause the server to
529 * request an OPEN_CONFIRM to start a new sequence.
531 sp->so_seqid.create_time = ktime_get();
534 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
536 nfs4_destroy_seqid_counter(&sp->so_seqid);
537 put_cred(sp->so_cred);
538 ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
542 static void nfs4_gc_state_owners(struct nfs_server *server)
544 struct nfs_client *clp = server->nfs_client;
545 struct nfs4_state_owner *sp, *tmp;
546 unsigned long time_min, time_max;
549 spin_lock(&clp->cl_lock);
551 time_min = (long)time_max - (long)clp->cl_lease_time;
552 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
553 /* NB: LRU is sorted so that oldest is at the head */
554 if (time_in_range(sp->so_expires, time_min, time_max))
556 list_move(&sp->so_lru, &doomed);
557 nfs4_remove_state_owner_locked(sp);
559 spin_unlock(&clp->cl_lock);
561 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
562 list_del(&sp->so_lru);
563 nfs4_free_state_owner(sp);
568 * nfs4_get_state_owner - Look up a state owner given a credential
569 * @server: nfs_server to search
570 * @cred: RPC credential to match
571 * @gfp_flags: allocation mode
573 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
575 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
576 const struct cred *cred,
579 struct nfs_client *clp = server->nfs_client;
580 struct nfs4_state_owner *sp, *new;
582 spin_lock(&clp->cl_lock);
583 sp = nfs4_find_state_owner_locked(server, cred);
584 spin_unlock(&clp->cl_lock);
587 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
590 spin_lock(&clp->cl_lock);
591 sp = nfs4_insert_state_owner_locked(new);
592 spin_unlock(&clp->cl_lock);
594 nfs4_free_state_owner(new);
596 nfs4_gc_state_owners(server);
601 * nfs4_put_state_owner - Release a nfs4_state_owner
602 * @sp: state owner data to release
604 * Note that we keep released state owners on an LRU
606 * This caches valid state owners so that they can be
607 * reused, to avoid the OPEN_CONFIRM on minor version 0.
608 * It also pins the uniquifier of dropped state owners for
609 * a while, to ensure that those state owner names are
612 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
614 struct nfs_server *server = sp->so_server;
615 struct nfs_client *clp = server->nfs_client;
617 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
620 sp->so_expires = jiffies;
621 list_add_tail(&sp->so_lru, &server->state_owners_lru);
622 spin_unlock(&clp->cl_lock);
626 * nfs4_purge_state_owners - Release all cached state owners
627 * @server: nfs_server with cached state owners to release
628 * @head: resulting list of state owners
630 * Called at umount time. Remaining state owners will be on
631 * the LRU with ref count of zero.
632 * Note that the state owners are not freed, but are added
633 * to the list @head, which can later be used as an argument
634 * to nfs4_free_state_owners.
636 void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
638 struct nfs_client *clp = server->nfs_client;
639 struct nfs4_state_owner *sp, *tmp;
641 spin_lock(&clp->cl_lock);
642 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
643 list_move(&sp->so_lru, head);
644 nfs4_remove_state_owner_locked(sp);
646 spin_unlock(&clp->cl_lock);
650 * nfs4_purge_state_owners - Release all cached state owners
651 * @head: resulting list of state owners
653 * Frees a list of state owners that was generated by
654 * nfs4_purge_state_owners
656 void nfs4_free_state_owners(struct list_head *head)
658 struct nfs4_state_owner *sp, *tmp;
660 list_for_each_entry_safe(sp, tmp, head, so_lru) {
661 list_del(&sp->so_lru);
662 nfs4_free_state_owner(sp);
666 static struct nfs4_state *
667 nfs4_alloc_open_state(void)
669 struct nfs4_state *state;
671 state = kzalloc(sizeof(*state), GFP_NOFS);
674 refcount_set(&state->count, 1);
675 INIT_LIST_HEAD(&state->lock_states);
676 spin_lock_init(&state->state_lock);
677 seqlock_init(&state->seqlock);
678 init_waitqueue_head(&state->waitq);
683 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
685 if (state->state == fmode)
687 /* NB! List reordering - see the reclaim code for why. */
688 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
689 if (fmode & FMODE_WRITE)
690 list_move(&state->open_states, &state->owner->so_states);
692 list_move_tail(&state->open_states, &state->owner->so_states);
694 state->state = fmode;
697 static struct nfs4_state *
698 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
700 struct nfs_inode *nfsi = NFS_I(inode);
701 struct nfs4_state *state;
703 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
704 if (state->owner != owner)
706 if (!nfs4_valid_open_stateid(state))
708 if (refcount_inc_not_zero(&state->count))
715 nfs4_free_open_state(struct nfs4_state *state)
717 kfree_rcu(state, rcu_head);
721 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
723 struct nfs4_state *state, *new;
724 struct nfs_inode *nfsi = NFS_I(inode);
727 state = __nfs4_find_state_byowner(inode, owner);
731 new = nfs4_alloc_open_state();
732 spin_lock(&owner->so_lock);
733 spin_lock(&inode->i_lock);
734 state = __nfs4_find_state_byowner(inode, owner);
735 if (state == NULL && new != NULL) {
737 state->owner = owner;
738 atomic_inc(&owner->so_count);
739 list_add_rcu(&state->inode_states, &nfsi->open_states);
741 state->inode = inode;
742 spin_unlock(&inode->i_lock);
743 /* Note: The reclaim code dictates that we add stateless
744 * and read-only stateids to the end of the list */
745 list_add_tail(&state->open_states, &owner->so_states);
746 spin_unlock(&owner->so_lock);
748 spin_unlock(&inode->i_lock);
749 spin_unlock(&owner->so_lock);
751 nfs4_free_open_state(new);
757 void nfs4_put_open_state(struct nfs4_state *state)
759 struct inode *inode = state->inode;
760 struct nfs4_state_owner *owner = state->owner;
762 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
764 spin_lock(&inode->i_lock);
765 list_del_rcu(&state->inode_states);
766 list_del(&state->open_states);
767 spin_unlock(&inode->i_lock);
768 spin_unlock(&owner->so_lock);
770 nfs4_free_open_state(state);
771 nfs4_put_state_owner(owner);
775 * Close the current file.
777 static void __nfs4_close(struct nfs4_state *state,
778 fmode_t fmode, gfp_t gfp_mask, int wait)
780 struct nfs4_state_owner *owner = state->owner;
784 atomic_inc(&owner->so_count);
785 /* Protect against nfs4_find_state() */
786 spin_lock(&owner->so_lock);
787 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
794 case FMODE_READ|FMODE_WRITE:
797 newstate = FMODE_READ|FMODE_WRITE;
798 if (state->n_rdwr == 0) {
799 if (state->n_rdonly == 0) {
800 newstate &= ~FMODE_READ;
801 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
802 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
804 if (state->n_wronly == 0) {
805 newstate &= ~FMODE_WRITE;
806 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
807 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
810 clear_bit(NFS_DELEGATED_STATE, &state->flags);
812 nfs4_state_set_mode_locked(state, newstate);
813 spin_unlock(&owner->so_lock);
816 nfs4_put_open_state(state);
817 nfs4_put_state_owner(owner);
819 nfs4_do_close(state, gfp_mask, wait);
822 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
824 __nfs4_close(state, fmode, GFP_NOFS, 0);
827 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
829 __nfs4_close(state, fmode, GFP_KERNEL, 1);
833 * Search the state->lock_states for an existing lock_owner
834 * that is compatible with either of the given owners.
835 * If the second is non-zero, then the first refers to a Posix-lock
836 * owner (current->files) and the second refers to a flock/OFD
837 * owner (struct file*). In that case, prefer a match for the first
839 * If both sorts of locks are held on the one file we cannot know
840 * which stateid was intended to be used, so a "correct" choice cannot
841 * be made. Failing that, a "consistent" choice is preferable. The
842 * consistent choice we make is to prefer the first owner, that of a
845 static struct nfs4_lock_state *
846 __nfs4_find_lock_state(struct nfs4_state *state,
847 fl_owner_t fl_owner, fl_owner_t fl_owner2)
849 struct nfs4_lock_state *pos, *ret = NULL;
850 list_for_each_entry(pos, &state->lock_states, ls_locks) {
851 if (pos->ls_owner == fl_owner) {
855 if (pos->ls_owner == fl_owner2)
859 refcount_inc(&ret->ls_count);
864 * Return a compatible lock_state. If no initialized lock_state structure
865 * exists, return an uninitialized one.
868 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
870 struct nfs4_lock_state *lsp;
871 struct nfs_server *server = state->owner->so_server;
873 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
876 nfs4_init_seqid_counter(&lsp->ls_seqid);
877 refcount_set(&lsp->ls_count, 1);
878 lsp->ls_state = state;
879 lsp->ls_owner = fl_owner;
880 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
881 if (lsp->ls_seqid.owner_id < 0)
883 INIT_LIST_HEAD(&lsp->ls_locks);
890 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
892 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
893 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
898 * Return a compatible lock_state. If no initialized lock_state structure
899 * exists, return an uninitialized one.
902 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
904 struct nfs4_lock_state *lsp, *new = NULL;
907 spin_lock(&state->state_lock);
908 lsp = __nfs4_find_lock_state(state, owner, NULL);
912 list_add(&new->ls_locks, &state->lock_states);
913 set_bit(LK_STATE_IN_USE, &state->flags);
918 spin_unlock(&state->state_lock);
919 new = nfs4_alloc_lock_state(state, owner);
923 spin_unlock(&state->state_lock);
925 nfs4_free_lock_state(state->owner->so_server, new);
930 * Release reference to lock_state, and free it if we see that
931 * it is no longer in use
933 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
935 struct nfs_server *server;
936 struct nfs4_state *state;
940 state = lsp->ls_state;
941 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
943 list_del(&lsp->ls_locks);
944 if (list_empty(&state->lock_states))
945 clear_bit(LK_STATE_IN_USE, &state->flags);
946 spin_unlock(&state->state_lock);
947 server = state->owner->so_server;
948 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
949 struct nfs_client *clp = server->nfs_client;
951 clp->cl_mvops->free_lock_state(server, lsp);
953 nfs4_free_lock_state(server, lsp);
956 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
958 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
960 dst->fl_u.nfs4_fl.owner = lsp;
961 refcount_inc(&lsp->ls_count);
964 static void nfs4_fl_release_lock(struct file_lock *fl)
966 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
969 static const struct file_lock_operations nfs4_fl_lock_ops = {
970 .fl_copy_lock = nfs4_fl_copy_lock,
971 .fl_release_private = nfs4_fl_release_lock,
974 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
976 struct nfs4_lock_state *lsp;
978 if (fl->fl_ops != NULL)
980 lsp = nfs4_get_lock_state(state, fl->fl_owner);
983 fl->fl_u.nfs4_fl.owner = lsp;
984 fl->fl_ops = &nfs4_fl_lock_ops;
988 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
989 struct nfs4_state *state,
990 const struct nfs_lock_context *l_ctx)
992 struct nfs4_lock_state *lsp;
993 fl_owner_t fl_owner, fl_flock_owner;
999 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
1002 fl_owner = l_ctx->lockowner;
1003 fl_flock_owner = l_ctx->open_context->flock_owner;
1005 spin_lock(&state->state_lock);
1006 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
1007 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
1009 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1010 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1013 spin_unlock(&state->state_lock);
1014 nfs4_put_lock_state(lsp);
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 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1069 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1074 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1076 struct nfs_seqid *new;
1078 new = kmalloc(sizeof(*new), gfp_mask);
1080 return ERR_PTR(-ENOMEM);
1081 new->sequence = counter;
1082 INIT_LIST_HEAD(&new->list);
1087 void nfs_release_seqid(struct nfs_seqid *seqid)
1089 struct nfs_seqid_counter *sequence;
1091 if (seqid == NULL || list_empty(&seqid->list))
1093 sequence = seqid->sequence;
1094 spin_lock(&sequence->lock);
1095 list_del_init(&seqid->list);
1096 if (!list_empty(&sequence->list)) {
1097 struct nfs_seqid *next;
1099 next = list_first_entry(&sequence->list,
1100 struct nfs_seqid, list);
1101 rpc_wake_up_queued_task(&sequence->wait, next->task);
1103 spin_unlock(&sequence->lock);
1106 void nfs_free_seqid(struct nfs_seqid *seqid)
1108 nfs_release_seqid(seqid);
1113 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1114 * failed with a seqid incrementing error -
1115 * see comments nfs4.h:seqid_mutating_error()
1117 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1122 case -NFS4ERR_BAD_SEQID:
1123 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1125 pr_warn_ratelimited("NFS: v4 server returned a bad"
1126 " sequence-id error on an"
1127 " unconfirmed sequence %p!\n",
1129 case -NFS4ERR_STALE_CLIENTID:
1130 case -NFS4ERR_STALE_STATEID:
1131 case -NFS4ERR_BAD_STATEID:
1132 case -NFS4ERR_BADXDR:
1133 case -NFS4ERR_RESOURCE:
1134 case -NFS4ERR_NOFILEHANDLE:
1135 case -NFS4ERR_MOVED:
1136 /* Non-seqid mutating errors */
1140 * Note: no locking needed as we are guaranteed to be first
1141 * on the sequence list
1143 seqid->sequence->counter++;
1146 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1148 struct nfs4_state_owner *sp;
1153 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1154 if (status == -NFS4ERR_BAD_SEQID)
1155 nfs4_reset_state_owner(sp);
1156 if (!nfs4_has_session(sp->so_server->nfs_client))
1157 nfs_increment_seqid(status, seqid);
1161 * Increment the seqid if the LOCK/LOCKU succeeded, or
1162 * failed with a seqid incrementing error -
1163 * see comments nfs4.h:seqid_mutating_error()
1165 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1168 nfs_increment_seqid(status, seqid);
1171 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1173 struct nfs_seqid_counter *sequence;
1178 sequence = seqid->sequence;
1179 spin_lock(&sequence->lock);
1181 if (list_empty(&seqid->list))
1182 list_add_tail(&seqid->list, &sequence->list);
1183 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1185 rpc_sleep_on(&sequence->wait, task, NULL);
1188 spin_unlock(&sequence->lock);
1193 static int nfs4_run_state_manager(void *);
1195 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1197 smp_mb__before_atomic();
1198 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1199 smp_mb__after_atomic();
1200 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1201 rpc_wake_up(&clp->cl_rpcwaitq);
1205 * Schedule the nfs_client asynchronous state management routine
1207 void nfs4_schedule_state_manager(struct nfs_client *clp)
1209 struct task_struct *task;
1210 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1212 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1213 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1215 __module_get(THIS_MODULE);
1216 refcount_inc(&clp->cl_count);
1218 /* The rcu_read_lock() is not strictly necessary, as the state
1219 * manager is the only thread that ever changes the rpc_xprt
1220 * after it's initialized. At this point, we're single threaded. */
1222 snprintf(buf, sizeof(buf), "%s-manager",
1223 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1225 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1227 printk(KERN_ERR "%s: kthread_run: %ld\n",
1228 __func__, PTR_ERR(task));
1229 nfs4_clear_state_manager_bit(clp);
1230 nfs_put_client(clp);
1231 module_put(THIS_MODULE);
1236 * Schedule a lease recovery attempt
1238 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1242 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1243 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1244 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1246 nfs4_schedule_state_manager(clp);
1248 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1251 * nfs4_schedule_migration_recovery - trigger migration recovery
1253 * @server: FSID that is migrating
1255 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1256 * value is returned.
1258 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1260 struct nfs_client *clp = server->nfs_client;
1262 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1263 pr_err("NFS: volatile file handles not supported (server %s)\n",
1268 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1271 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1273 (unsigned long long)server->fsid.major,
1274 (unsigned long long)server->fsid.minor,
1277 set_bit(NFS_MIG_IN_TRANSITION,
1278 &((struct nfs_server *)server)->mig_status);
1279 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1281 nfs4_schedule_state_manager(clp);
1284 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1287 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1289 * @clp: server to check for moved leases
1292 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1294 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1295 __func__, clp->cl_clientid, clp->cl_hostname);
1297 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1298 nfs4_schedule_state_manager(clp);
1300 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1302 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1308 refcount_inc(&clp->cl_count);
1309 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1310 nfs_wait_bit_killable, TASK_KILLABLE);
1313 if (clp->cl_cons_state < 0)
1314 res = clp->cl_cons_state;
1316 nfs_put_client(clp);
1320 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1325 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1326 ret = nfs4_wait_clnt_recover(clp);
1329 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1330 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1332 nfs4_schedule_state_manager(clp);
1339 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1340 * @clp: client to process
1342 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1343 * resend of the SETCLIENTID and hence re-establish the
1344 * callback channel. Then return all existing delegations.
1346 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1348 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1349 nfs_expire_all_delegations(clp);
1350 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1354 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1356 nfs40_handle_cb_pathdown(clp);
1357 nfs4_schedule_state_manager(clp);
1360 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1363 if (!nfs4_valid_open_stateid(state))
1365 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1366 /* Don't recover state that expired before the reboot */
1367 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1368 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1371 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1372 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1376 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1378 if (!nfs4_valid_open_stateid(state))
1380 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1381 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1382 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1383 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1387 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1389 struct nfs_client *clp = server->nfs_client;
1391 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1393 nfs_inode_find_delegation_state_and_recover(state->inode,
1395 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1397 nfs4_schedule_state_manager(clp);
1400 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1402 static struct nfs4_lock_state *
1403 nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1404 const nfs4_stateid *stateid)
1406 struct nfs4_lock_state *pos;
1408 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1409 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1411 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
1417 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1418 const nfs4_stateid *stateid)
1422 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1423 spin_lock(&state->state_lock);
1424 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1426 spin_unlock(&state->state_lock);
1431 void nfs_inode_find_state_and_recover(struct inode *inode,
1432 const nfs4_stateid *stateid)
1434 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1435 struct nfs_inode *nfsi = NFS_I(inode);
1436 struct nfs_open_context *ctx;
1437 struct nfs4_state *state;
1441 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1445 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
1446 nfs4_state_mark_reclaim_nograce(clp, state)) {
1450 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1451 nfs4_stateid_match_or_older(&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, int err)
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);
1478 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1479 "error = %d\n", ctx->dentry, err);
1484 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1486 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1487 nfs4_state_mark_open_context_bad(state, error);
1491 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1493 struct inode *inode = state->inode;
1494 struct nfs_inode *nfsi = NFS_I(inode);
1495 struct file_lock *fl;
1496 struct nfs4_lock_state *lsp;
1498 struct file_lock_context *flctx = inode->i_flctx;
1499 struct list_head *list;
1504 list = &flctx->flc_posix;
1506 /* Guard against delegation returns and new lock/unlock calls */
1507 down_write(&nfsi->rwsem);
1508 spin_lock(&flctx->flc_lock);
1510 list_for_each_entry(fl, list, fl_list) {
1511 if (nfs_file_open_context(fl->fl_file)->state != state)
1513 spin_unlock(&flctx->flc_lock);
1514 status = ops->recover_lock(state, fl);
1520 case -NFS4ERR_ADMIN_REVOKED:
1521 case -NFS4ERR_STALE_STATEID:
1522 case -NFS4ERR_BAD_STATEID:
1523 case -NFS4ERR_EXPIRED:
1524 case -NFS4ERR_NO_GRACE:
1525 case -NFS4ERR_STALE_CLIENTID:
1526 case -NFS4ERR_BADSESSION:
1527 case -NFS4ERR_BADSLOT:
1528 case -NFS4ERR_BAD_HIGH_SLOT:
1529 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1532 pr_err("NFS: %s: unhandled error %d\n",
1536 case -NFS4ERR_DENIED:
1537 case -NFS4ERR_RECLAIM_BAD:
1538 case -NFS4ERR_RECLAIM_CONFLICT:
1539 lsp = fl->fl_u.nfs4_fl.owner;
1541 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1544 spin_lock(&flctx->flc_lock);
1546 if (list == &flctx->flc_posix) {
1547 list = &flctx->flc_flock;
1550 spin_unlock(&flctx->flc_lock);
1552 up_write(&nfsi->rwsem);
1556 #ifdef CONFIG_NFS_V4_2
1557 static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1559 struct nfs4_copy_state *copy;
1561 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1562 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1565 spin_lock(&sp->so_server->nfs_client->cl_lock);
1566 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1567 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1568 !nfs4_stateid_match_other(&state->stateid,
1569 ©->parent_dst_state->stateid)))
1572 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1574 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1575 complete(©->completion);
1578 list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) {
1579 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1580 !nfs4_stateid_match_other(&state->stateid,
1581 ©->parent_src_state->stateid)))
1584 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1586 complete(©->completion);
1588 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1590 #else /* !CONFIG_NFS_V4_2 */
1591 static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1592 struct nfs4_state *state)
1595 #endif /* CONFIG_NFS_V4_2 */
1597 static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1598 const struct nfs4_state_recovery_ops *ops)
1600 struct nfs4_lock_state *lock;
1603 status = ops->recover_open(sp, state);
1607 status = nfs4_reclaim_locks(state, ops);
1611 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1612 spin_lock(&state->state_lock);
1613 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1614 trace_nfs4_state_lock_reclaim(state, lock);
1615 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1616 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__);
1618 spin_unlock(&state->state_lock);
1621 nfs42_complete_copies(sp, state);
1622 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1626 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1628 struct nfs4_state *state;
1629 unsigned int loop = 0;
1631 #ifdef CONFIG_NFS_V4_2
1632 bool found_ssc_copy_state = false;
1633 #endif /* CONFIG_NFS_V4_2 */
1635 /* Note: we rely on the sp->so_states list being ordered
1636 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1638 * This is needed to ensure that the server won't give us any
1639 * read delegations that we have to return if, say, we are
1640 * recovering after a network partition or a reboot from a
1641 * server that doesn't support a grace period.
1643 spin_lock(&sp->so_lock);
1644 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1646 list_for_each_entry(state, &sp->so_states, open_states) {
1647 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1649 if (!nfs4_valid_open_stateid(state))
1651 if (state->state == 0)
1653 #ifdef CONFIG_NFS_V4_2
1654 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1655 nfs4_state_mark_recovery_failed(state, -EIO);
1656 found_ssc_copy_state = true;
1659 #endif /* CONFIG_NFS_V4_2 */
1660 refcount_inc(&state->count);
1661 spin_unlock(&sp->so_lock);
1662 status = __nfs4_reclaim_open_state(sp, state, ops);
1670 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1678 /* Open state on this file cannot be recovered */
1679 nfs4_state_mark_recovery_failed(state, status);
1684 set_bit(ops->state_flag_bit, &state->flags);
1688 case -NFS4ERR_ADMIN_REVOKED:
1689 case -NFS4ERR_STALE_STATEID:
1690 case -NFS4ERR_OLD_STATEID:
1691 case -NFS4ERR_BAD_STATEID:
1692 case -NFS4ERR_RECLAIM_BAD:
1693 case -NFS4ERR_RECLAIM_CONFLICT:
1694 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1696 case -NFS4ERR_EXPIRED:
1697 case -NFS4ERR_NO_GRACE:
1698 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1700 case -NFS4ERR_STALE_CLIENTID:
1701 case -NFS4ERR_BADSESSION:
1702 case -NFS4ERR_BADSLOT:
1703 case -NFS4ERR_BAD_HIGH_SLOT:
1704 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1708 nfs4_put_open_state(state);
1709 spin_lock(&sp->so_lock);
1712 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1713 spin_unlock(&sp->so_lock);
1714 #ifdef CONFIG_NFS_V4_2
1715 if (found_ssc_copy_state)
1717 #endif /* CONFIG_NFS_V4_2 */
1720 nfs4_put_open_state(state);
1721 spin_lock(&sp->so_lock);
1722 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1723 spin_unlock(&sp->so_lock);
1727 static void nfs4_clear_open_state(struct nfs4_state *state)
1729 struct nfs4_lock_state *lock;
1731 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1732 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1733 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1734 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1735 spin_lock(&state->state_lock);
1736 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1737 lock->ls_seqid.flags = 0;
1738 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1740 spin_unlock(&state->state_lock);
1743 static void nfs4_reset_seqids(struct nfs_server *server,
1744 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1746 struct nfs_client *clp = server->nfs_client;
1747 struct nfs4_state_owner *sp;
1748 struct rb_node *pos;
1749 struct nfs4_state *state;
1751 spin_lock(&clp->cl_lock);
1752 for (pos = rb_first(&server->state_owners);
1754 pos = rb_next(pos)) {
1755 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1756 sp->so_seqid.flags = 0;
1757 spin_lock(&sp->so_lock);
1758 list_for_each_entry(state, &sp->so_states, open_states) {
1759 if (mark_reclaim(clp, state))
1760 nfs4_clear_open_state(state);
1762 spin_unlock(&sp->so_lock);
1764 spin_unlock(&clp->cl_lock);
1767 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1768 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1770 struct nfs_server *server;
1773 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1774 nfs4_reset_seqids(server, mark_reclaim);
1778 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1780 /* Mark all delegations for reclaim */
1781 nfs_delegation_mark_reclaim(clp);
1782 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1785 static int nfs4_reclaim_complete(struct nfs_client *clp,
1786 const struct nfs4_state_recovery_ops *ops,
1787 const struct cred *cred)
1789 /* Notify the server we're done reclaiming our state */
1790 if (ops->reclaim_complete)
1791 return ops->reclaim_complete(clp, cred);
1795 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1797 struct nfs_client *clp = server->nfs_client;
1798 struct nfs4_state_owner *sp;
1799 struct rb_node *pos;
1800 struct nfs4_state *state;
1802 spin_lock(&clp->cl_lock);
1803 for (pos = rb_first(&server->state_owners);
1805 pos = rb_next(pos)) {
1806 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1807 spin_lock(&sp->so_lock);
1808 list_for_each_entry(state, &sp->so_states, open_states) {
1809 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1812 nfs4_state_mark_reclaim_nograce(clp, state);
1814 spin_unlock(&sp->so_lock);
1816 spin_unlock(&clp->cl_lock);
1819 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1821 struct nfs_server *server;
1823 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1827 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1828 nfs4_clear_reclaim_server(server);
1831 nfs_delegation_reap_unclaimed(clp);
1835 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1837 const struct nfs4_state_recovery_ops *ops;
1838 const struct cred *cred;
1841 if (!nfs4_state_clear_reclaim_reboot(clp))
1843 ops = clp->cl_mvops->reboot_recovery_ops;
1844 cred = nfs4_get_clid_cred(clp);
1845 err = nfs4_reclaim_complete(clp, ops, cred);
1847 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1848 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1851 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1853 nfs_mark_test_expired_all_delegations(clp);
1854 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1857 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1862 case -NFS4ERR_CB_PATH_DOWN:
1863 nfs40_handle_cb_pathdown(clp);
1865 case -NFS4ERR_NO_GRACE:
1866 nfs4_state_end_reclaim_reboot(clp);
1868 case -NFS4ERR_STALE_CLIENTID:
1869 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1870 nfs4_state_start_reclaim_reboot(clp);
1872 case -NFS4ERR_EXPIRED:
1873 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1874 nfs4_state_start_reclaim_nograce(clp);
1876 case -NFS4ERR_BADSESSION:
1877 case -NFS4ERR_BADSLOT:
1878 case -NFS4ERR_BAD_HIGH_SLOT:
1879 case -NFS4ERR_DEADSESSION:
1880 case -NFS4ERR_SEQ_FALSE_RETRY:
1881 case -NFS4ERR_SEQ_MISORDERED:
1882 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1883 /* Zero session reset errors */
1885 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1886 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1889 dprintk("%s: failed to handle error %d for server %s\n",
1890 __func__, error, clp->cl_hostname);
1893 dprintk("%s: handled error %d for server %s\n", __func__, error,
1898 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1900 struct nfs4_state_owner *sp;
1901 struct nfs_server *server;
1902 struct rb_node *pos;
1908 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1909 nfs4_purge_state_owners(server, &freeme);
1910 spin_lock(&clp->cl_lock);
1911 for (pos = rb_first(&server->state_owners);
1913 pos = rb_next(pos)) {
1915 struct nfs4_state_owner, so_server_node);
1916 if (!test_and_clear_bit(ops->owner_flag_bit,
1919 if (!atomic_inc_not_zero(&sp->so_count))
1921 spin_unlock(&clp->cl_lock);
1924 status = nfs4_reclaim_open_state(sp, ops);
1926 set_bit(ops->owner_flag_bit, &sp->so_flags);
1927 nfs4_put_state_owner(sp);
1928 status = nfs4_recovery_handle_error(clp, status);
1929 return (status != 0) ? status : -EAGAIN;
1932 nfs4_put_state_owner(sp);
1935 spin_unlock(&clp->cl_lock);
1938 nfs4_free_state_owners(&freeme);
1942 static int nfs4_check_lease(struct nfs_client *clp)
1944 const struct cred *cred;
1945 const struct nfs4_state_maintenance_ops *ops =
1946 clp->cl_mvops->state_renewal_ops;
1949 /* Is the client already known to have an expired lease? */
1950 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1952 cred = ops->get_state_renewal_cred(clp);
1954 cred = nfs4_get_clid_cred(clp);
1959 status = ops->renew_lease(clp, cred);
1961 if (status == -ETIMEDOUT) {
1962 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1966 return nfs4_recovery_handle_error(clp, status);
1969 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1970 * and for recoverable errors on EXCHANGE_ID for v4.1
1972 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1975 case -NFS4ERR_SEQ_MISORDERED:
1976 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1977 return -ESERVERFAULT;
1978 /* Lease confirmation error: retry after purging the lease */
1980 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1982 case -NFS4ERR_STALE_CLIENTID:
1983 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1984 nfs4_state_start_reclaim_reboot(clp);
1986 case -NFS4ERR_CLID_INUSE:
1987 pr_err("NFS: Server %s reports our clientid is in use\n",
1989 nfs_mark_client_ready(clp, -EPERM);
1990 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1993 case -NFS4ERR_DELAY:
1998 case -NFS4ERR_MINOR_VERS_MISMATCH:
1999 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2000 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
2001 dprintk("%s: exit with error %d for server %s\n",
2002 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2003 return -EPROTONOSUPPORT;
2004 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2005 * in nfs4_exchange_id */
2007 dprintk("%s: exit with error %d for server %s\n", __func__,
2008 status, clp->cl_hostname);
2011 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2012 dprintk("%s: handled error %d for server %s\n", __func__, status,
2017 static int nfs4_establish_lease(struct nfs_client *clp)
2019 const struct cred *cred;
2020 const struct nfs4_state_recovery_ops *ops =
2021 clp->cl_mvops->reboot_recovery_ops;
2024 status = nfs4_begin_drain_session(clp);
2027 cred = nfs4_get_clid_cred(clp);
2030 status = ops->establish_clid(clp, cred);
2034 pnfs_destroy_all_layouts(clp);
2039 * Returns zero or a negative errno. NFS4ERR values are converted
2040 * to local errno values.
2042 static int nfs4_reclaim_lease(struct nfs_client *clp)
2046 status = nfs4_establish_lease(clp);
2048 return nfs4_handle_reclaim_lease_error(clp, status);
2049 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2050 nfs4_state_start_reclaim_nograce(clp);
2051 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2052 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2053 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2054 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2058 static int nfs4_purge_lease(struct nfs_client *clp)
2062 status = nfs4_establish_lease(clp);
2064 return nfs4_handle_reclaim_lease_error(clp, status);
2065 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2066 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2067 nfs4_state_start_reclaim_nograce(clp);
2072 * Try remote migration of one FSID from a source server to a
2073 * destination server. The source server provides a list of
2074 * potential destinations.
2076 * Returns zero or a negative NFS4ERR status code.
2078 static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2080 struct nfs_client *clp = server->nfs_client;
2081 struct nfs4_fs_locations *locations = NULL;
2082 struct inode *inode;
2086 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2087 (unsigned long long)server->fsid.major,
2088 (unsigned long long)server->fsid.minor,
2092 page = alloc_page(GFP_KERNEL);
2093 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2094 if (page == NULL || locations == NULL) {
2095 dprintk("<-- %s: no memory\n", __func__);
2099 inode = d_inode(server->super->s_root);
2100 result = nfs4_proc_get_locations(inode, locations, page, cred);
2102 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2107 result = -NFS4ERR_NXIO;
2108 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2109 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2114 status = nfs4_begin_drain_session(clp);
2120 status = nfs4_replace_transport(server, locations);
2122 dprintk("<-- %s: failed to replace transport: %d\n",
2128 dprintk("<-- %s: migration succeeded\n", __func__);
2135 pr_err("NFS: migration recovery failed (server %s)\n",
2137 set_bit(NFS_MIG_FAILED, &server->mig_status);
2143 * Returns zero or a negative NFS4ERR status code.
2145 static int nfs4_handle_migration(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: migration 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) {
2165 if (server->mig_gen == clp->cl_mig_gen)
2167 server->mig_gen = clp->cl_mig_gen;
2169 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2170 &server->mig_status))
2174 status = nfs4_try_migration(server, cred);
2187 * Test each nfs_server on the clp's cl_superblocks list to see
2188 * if it's moved to another server. Stop when the server no longer
2189 * returns NFS4ERR_LEASE_MOVED.
2191 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2193 const struct nfs4_state_maintenance_ops *ops =
2194 clp->cl_mvops->state_renewal_ops;
2195 struct nfs_server *server;
2196 const struct cred *cred;
2198 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2201 cred = ops->get_state_renewal_cred(clp);
2203 return -NFS4ERR_NOENT;
2208 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2209 struct inode *inode;
2212 if (server->mig_gen == clp->cl_mig_gen)
2214 server->mig_gen = clp->cl_mig_gen;
2218 inode = d_inode(server->super->s_root);
2219 status = nfs4_proc_fsid_present(inode, cred);
2220 if (status != -NFS4ERR_MOVED)
2221 goto restart; /* wasn't this one */
2222 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2223 goto restart; /* there are more */
2234 * nfs4_discover_server_trunking - Detect server IP address trunking
2236 * @clp: nfs_client under test
2237 * @result: OUT: found nfs_client, or clp
2239 * Returns zero or a negative errno. If zero is returned,
2240 * an nfs_client pointer is planted in "result".
2242 * Note: since we are invoked in process context, and
2243 * not from inside the state manager, we cannot use
2244 * nfs4_handle_reclaim_lease_error().
2246 int nfs4_discover_server_trunking(struct nfs_client *clp,
2247 struct nfs_client **result)
2249 const struct nfs4_state_recovery_ops *ops =
2250 clp->cl_mvops->reboot_recovery_ops;
2251 struct rpc_clnt *clnt;
2252 const struct cred *cred;
2255 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2257 clnt = clp->cl_rpcclient;
2260 mutex_lock(&nfs_clid_init_mutex);
2263 cred = nfs4_get_clid_cred(clp);
2267 status = ops->detect_trunking(clp, result, cred);
2275 if (clnt->cl_softrtry)
2278 case -NFS4ERR_DELAY:
2282 case -NFS4ERR_STALE_CLIENTID:
2283 dprintk("NFS: %s after status %d, retrying\n",
2288 nfs4_root_machine_cred(clp);
2291 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2294 case -NFS4ERR_CLID_INUSE:
2295 case -NFS4ERR_WRONGSEC:
2296 /* No point in retrying if we already used RPC_AUTH_UNIX */
2297 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2301 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2303 status = PTR_ERR(clnt);
2306 /* Note: this is safe because we haven't yet marked the
2307 * client as ready, so we are the only user of
2310 clnt = xchg(&clp->cl_rpcclient, clnt);
2311 rpc_shutdown_client(clnt);
2312 clnt = clp->cl_rpcclient;
2315 case -NFS4ERR_MINOR_VERS_MISMATCH:
2316 status = -EPROTONOSUPPORT;
2320 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2321 * in nfs4_exchange_id */
2322 status = -EKEYEXPIRED;
2325 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2331 mutex_unlock(&nfs_clid_init_mutex);
2332 dprintk("NFS: %s: status = %d\n", __func__, status);
2336 #ifdef CONFIG_NFS_V4_1
2337 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2339 struct nfs_client *clp = session->clp;
2343 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2345 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2346 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2348 nfs4_schedule_state_manager(clp);
2350 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2352 void nfs41_notify_server(struct nfs_client *clp)
2354 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2355 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2356 nfs4_schedule_state_manager(clp);
2359 static void nfs4_reset_all_state(struct nfs_client *clp)
2361 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2362 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2363 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2364 nfs4_state_start_reclaim_nograce(clp);
2365 dprintk("%s: scheduling reset of all state for server %s!\n",
2366 __func__, clp->cl_hostname);
2367 nfs4_schedule_state_manager(clp);
2371 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2373 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2374 nfs4_state_start_reclaim_reboot(clp);
2375 dprintk("%s: server %s rebooted!\n", __func__,
2377 nfs4_schedule_state_manager(clp);
2381 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2383 nfs4_reset_all_state(clp);
2384 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2387 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2389 nfs4_state_start_reclaim_nograce(clp);
2390 nfs4_schedule_state_manager(clp);
2392 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2395 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2397 /* FIXME: For now, we destroy all layouts. */
2398 pnfs_destroy_all_layouts(clp);
2399 nfs_test_expired_all_delegations(clp);
2400 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2404 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2406 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2407 nfs4_schedule_state_manager(clp);
2409 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2413 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2415 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2416 &clp->cl_state) == 0)
2417 nfs4_schedule_state_manager(clp);
2420 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2426 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2427 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2429 * If we're called from the state manager thread, then assume we're
2430 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2431 * Those flags are expected to remain set until we're done
2432 * recovering (see RFC5661, section 18.46.3).
2437 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2438 nfs41_handle_server_reboot(clp);
2439 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2440 nfs41_handle_all_state_revoked(clp);
2441 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2442 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2443 nfs41_handle_some_state_revoked(clp);
2444 if (flags & SEQ4_STATUS_LEASE_MOVED)
2445 nfs4_schedule_lease_moved_recovery(clp);
2446 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2447 nfs41_handle_recallable_state_revoked(clp);
2449 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2450 nfs41_handle_backchannel_fault(clp);
2451 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2452 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2453 nfs41_handle_cb_path_down(clp);
2456 static int nfs4_reset_session(struct nfs_client *clp)
2458 const struct cred *cred;
2461 if (!nfs4_has_session(clp))
2463 status = nfs4_begin_drain_session(clp);
2466 cred = nfs4_get_clid_cred(clp);
2467 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2470 case -NFS4ERR_BADSESSION:
2471 case -NFS4ERR_DEADSESSION:
2473 case -NFS4ERR_BACK_CHAN_BUSY:
2474 case -NFS4ERR_DELAY:
2475 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2480 status = nfs4_recovery_handle_error(clp, status);
2484 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2485 status = nfs4_proc_create_session(clp, cred);
2487 dprintk("%s: session reset failed with status %d for server %s!\n",
2488 __func__, status, clp->cl_hostname);
2489 status = nfs4_handle_reclaim_lease_error(clp, status);
2492 nfs41_finish_session_reset(clp);
2493 dprintk("%s: session reset was successful for server %s!\n",
2494 __func__, clp->cl_hostname);
2500 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2502 const struct cred *cred;
2505 if (!nfs4_has_session(clp))
2507 ret = nfs4_begin_drain_session(clp);
2510 cred = nfs4_get_clid_cred(clp);
2511 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2513 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2516 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2517 __func__, clp->cl_hostname);
2519 case -NFS4ERR_DELAY:
2521 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2524 return nfs4_recovery_handle_error(clp, ret);
2528 #else /* CONFIG_NFS_V4_1 */
2529 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2531 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2535 #endif /* CONFIG_NFS_V4_1 */
2537 static void nfs4_state_manager(struct nfs_client *clp)
2540 const char *section = "", *section_sep = "";
2542 /* Ensure exclusive access to NFSv4 state */
2544 trace_nfs4_state_mgr(clp);
2545 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2546 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2547 section = "purge state";
2548 status = nfs4_purge_lease(clp);
2554 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2555 section = "lease expired";
2556 /* We're going to have to re-establish a clientid */
2557 status = nfs4_reclaim_lease(clp);
2563 /* Initialize or reset the session */
2564 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2565 section = "reset session";
2566 status = nfs4_reset_session(clp);
2567 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2573 /* Send BIND_CONN_TO_SESSION */
2574 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2576 section = "bind conn to session";
2577 status = nfs4_bind_conn_to_session(clp);
2583 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2584 section = "check lease";
2585 status = nfs4_check_lease(clp);
2591 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2592 section = "migration";
2593 status = nfs4_handle_migration(clp);
2598 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2599 section = "lease moved";
2600 status = nfs4_handle_lease_moved(clp);
2605 /* First recover reboot state... */
2606 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2607 section = "reclaim reboot";
2608 status = nfs4_do_reclaim(clp,
2609 clp->cl_mvops->reboot_recovery_ops);
2610 if (status == -EAGAIN)
2614 nfs4_state_end_reclaim_reboot(clp);
2617 /* Detect expired delegations... */
2618 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2619 section = "detect expired delegations";
2620 nfs_reap_expired_delegations(clp);
2624 /* Now recover expired state... */
2625 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2626 section = "reclaim nograce";
2627 status = nfs4_do_reclaim(clp,
2628 clp->cl_mvops->nograce_recovery_ops);
2629 if (status == -EAGAIN)
2633 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2636 nfs4_end_drain_session(clp);
2637 nfs4_clear_state_manager_bit(clp);
2639 if (!test_and_set_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state)) {
2640 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2641 nfs_client_return_marked_delegations(clp);
2642 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2644 clear_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state);
2647 /* Did we race with an attempt to give us more work? */
2648 if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
2650 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2652 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2656 if (strlen(section))
2658 trace_nfs4_state_mgr_failed(clp, section, status);
2659 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2660 " with error %d\n", section_sep, section,
2661 clp->cl_hostname, -status);
2664 nfs4_end_drain_session(clp);
2665 nfs4_clear_state_manager_bit(clp);
2668 static int nfs4_run_state_manager(void *ptr)
2670 struct nfs_client *clp = ptr;
2672 allow_signal(SIGKILL);
2673 nfs4_state_manager(clp);
2674 nfs_put_client(clp);
2675 module_put_and_exit(0);