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 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp);
70 const nfs4_stateid zero_stateid = {
72 .type = NFS4_SPECIAL_STATEID_TYPE,
74 static DEFINE_MUTEX(nfs_clid_init_mutex);
76 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
78 struct nfs4_setclientid_res clid = {
79 .clientid = clp->cl_clientid,
80 .confirm = clp->cl_confirm,
84 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
86 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
88 port = nn->nfs_callback_tcpport;
89 if (clp->cl_addr.ss_family == AF_INET6)
90 port = nn->nfs_callback_tcpport6;
92 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
95 clp->cl_clientid = clid.clientid;
96 clp->cl_confirm = clid.confirm;
97 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
99 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
102 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
103 nfs4_schedule_state_renewal(clp);
109 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
111 * @clp: nfs_client under test
112 * @result: OUT: found nfs_client, or clp
113 * @cred: credential to use for trunking test
115 * Returns zero, a negative errno, or a negative NFS4ERR status.
116 * If zero is returned, an nfs_client pointer is planted in
119 * Note: The returned client may not yet be marked ready.
121 int nfs40_discover_server_trunking(struct nfs_client *clp,
122 struct nfs_client **result,
123 struct rpc_cred *cred)
125 struct nfs4_setclientid_res clid = {
126 .clientid = clp->cl_clientid,
127 .confirm = clp->cl_confirm,
129 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
133 port = nn->nfs_callback_tcpport;
134 if (clp->cl_addr.ss_family == AF_INET6)
135 port = nn->nfs_callback_tcpport6;
137 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
140 clp->cl_clientid = clid.clientid;
141 clp->cl_confirm = clid.confirm;
143 status = nfs40_walk_client_list(clp, result, cred);
145 /* Sustain the lease, even if it's empty. If the clientid4
146 * goes stale it's of no use for trunking discovery. */
147 nfs4_schedule_state_renewal(*result);
149 /* If the client state need to recover, do it. */
151 nfs4_schedule_state_manager(clp);
157 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
159 struct rpc_cred *cred = NULL;
161 if (clp->cl_machine_cred != NULL)
162 cred = get_rpccred(clp->cl_machine_cred);
166 static void nfs4_root_machine_cred(struct nfs_client *clp)
168 struct rpc_cred *cred, *new;
170 new = rpc_lookup_machine_cred(NULL);
171 spin_lock(&clp->cl_lock);
172 cred = clp->cl_machine_cred;
173 clp->cl_machine_cred = new;
174 spin_unlock(&clp->cl_lock);
179 static struct rpc_cred *
180 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
182 struct rpc_cred *cred = NULL;
183 struct nfs4_state_owner *sp;
186 for (pos = rb_first(&server->state_owners);
188 pos = rb_next(pos)) {
189 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
190 if (list_empty(&sp->so_states))
192 cred = get_rpccred(sp->so_cred);
199 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
200 * @clp: client state handle
202 * Returns an rpc_cred with reference count bumped, or NULL.
203 * Caller must hold clp->cl_lock.
205 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
207 struct rpc_cred *cred = NULL;
208 struct nfs_server *server;
210 /* Use machine credentials if available */
211 cred = nfs4_get_machine_cred_locked(clp);
216 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
217 cred = nfs4_get_renew_cred_server_locked(server);
227 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
229 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
230 spin_lock(&tbl->slot_tbl_lock);
231 nfs41_wake_slot_table(tbl);
232 spin_unlock(&tbl->slot_tbl_lock);
236 static void nfs4_end_drain_session(struct nfs_client *clp)
238 struct nfs4_session *ses = clp->cl_session;
240 if (clp->cl_slot_tbl) {
241 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
246 nfs4_end_drain_slot_table(&ses->bc_slot_table);
247 nfs4_end_drain_slot_table(&ses->fc_slot_table);
251 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
253 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
254 spin_lock(&tbl->slot_tbl_lock);
255 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
256 reinit_completion(&tbl->complete);
257 spin_unlock(&tbl->slot_tbl_lock);
258 return wait_for_completion_interruptible(&tbl->complete);
260 spin_unlock(&tbl->slot_tbl_lock);
264 static int nfs4_begin_drain_session(struct nfs_client *clp)
266 struct nfs4_session *ses = clp->cl_session;
269 if (clp->cl_slot_tbl)
270 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
273 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
277 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
280 #if defined(CONFIG_NFS_V4_1)
282 static int nfs41_setup_state_renewal(struct nfs_client *clp)
285 struct nfs_fsinfo fsinfo;
288 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
289 nfs4_schedule_state_renewal(clp);
294 status = nfs4_proc_get_lease_time(clp, &fsinfo);
296 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
297 nfs4_schedule_state_renewal(clp);
303 static void nfs41_finish_session_reset(struct nfs_client *clp)
305 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
306 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
307 /* create_session negotiated new slot table */
308 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
309 nfs41_setup_state_renewal(clp);
312 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
316 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
318 status = nfs4_proc_exchange_id(clp, cred);
321 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
323 status = nfs4_proc_create_session(clp, cred);
326 if (!(clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R))
327 nfs4_state_start_reclaim_reboot(clp);
328 nfs41_finish_session_reset(clp);
329 nfs_mark_client_ready(clp, NFS_CS_READY);
335 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
337 * @clp: nfs_client under test
338 * @result: OUT: found nfs_client, or clp
339 * @cred: credential to use for trunking test
341 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
342 * If NFS4_OK is returned, an nfs_client pointer is planted in
345 * Note: The returned client may not yet be marked ready.
347 int nfs41_discover_server_trunking(struct nfs_client *clp,
348 struct nfs_client **result,
349 struct rpc_cred *cred)
353 status = nfs4_proc_exchange_id(clp, cred);
354 if (status != NFS4_OK)
357 status = nfs41_walk_client_list(clp, result, cred);
364 * Purge state if the client id was established in a prior
365 * instance and the client id could not have arrived on the
366 * server via Transparent State Migration.
368 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
369 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
370 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
372 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
374 nfs4_schedule_state_manager(clp);
375 status = nfs_wait_client_init_complete(clp);
381 #endif /* CONFIG_NFS_V4_1 */
384 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
385 * @clp: client state handle
387 * Returns an rpc_cred with reference count bumped, or NULL.
389 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
391 struct rpc_cred *cred;
393 spin_lock(&clp->cl_lock);
394 cred = nfs4_get_machine_cred_locked(clp);
395 spin_unlock(&clp->cl_lock);
399 static struct nfs4_state_owner *
400 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
402 struct rb_node **p = &server->state_owners.rb_node,
404 struct nfs4_state_owner *sp;
408 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
410 if (cred < sp->so_cred)
411 p = &parent->rb_left;
412 else if (cred > sp->so_cred)
413 p = &parent->rb_right;
415 if (!list_empty(&sp->so_lru))
416 list_del_init(&sp->so_lru);
417 atomic_inc(&sp->so_count);
424 static struct nfs4_state_owner *
425 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
427 struct nfs_server *server = new->so_server;
428 struct rb_node **p = &server->state_owners.rb_node,
430 struct nfs4_state_owner *sp;
435 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
437 if (new->so_cred < sp->so_cred)
438 p = &parent->rb_left;
439 else if (new->so_cred > sp->so_cred)
440 p = &parent->rb_right;
442 if (!list_empty(&sp->so_lru))
443 list_del_init(&sp->so_lru);
444 atomic_inc(&sp->so_count);
448 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
451 rb_link_node(&new->so_server_node, parent, p);
452 rb_insert_color(&new->so_server_node, &server->state_owners);
457 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
459 struct nfs_server *server = sp->so_server;
461 if (!RB_EMPTY_NODE(&sp->so_server_node))
462 rb_erase(&sp->so_server_node, &server->state_owners);
463 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
467 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
469 sc->create_time = ktime_get();
472 spin_lock_init(&sc->lock);
473 INIT_LIST_HEAD(&sc->list);
474 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
478 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
480 rpc_destroy_wait_queue(&sc->wait);
484 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
485 * create a new state_owner.
488 static struct nfs4_state_owner *
489 nfs4_alloc_state_owner(struct nfs_server *server,
490 struct rpc_cred *cred,
493 struct nfs4_state_owner *sp;
495 sp = kzalloc(sizeof(*sp), gfp_flags);
498 sp->so_server = server;
499 sp->so_cred = get_rpccred(cred);
500 spin_lock_init(&sp->so_lock);
501 INIT_LIST_HEAD(&sp->so_states);
502 nfs4_init_seqid_counter(&sp->so_seqid);
503 atomic_set(&sp->so_count, 1);
504 INIT_LIST_HEAD(&sp->so_lru);
505 seqcount_init(&sp->so_reclaim_seqcount);
506 mutex_init(&sp->so_delegreturn_mutex);
511 nfs4_reset_state_owner(struct nfs4_state_owner *sp)
513 /* This state_owner is no longer usable, but must
514 * remain in place so that state recovery can find it
515 * and the opens associated with it.
516 * It may also be used for new 'open' request to
517 * return a delegation to the server.
518 * So update the 'create_time' so that it looks like
519 * a new state_owner. This will cause the server to
520 * request an OPEN_CONFIRM to start a new sequence.
522 sp->so_seqid.create_time = ktime_get();
525 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
527 nfs4_destroy_seqid_counter(&sp->so_seqid);
528 put_rpccred(sp->so_cred);
532 static void nfs4_gc_state_owners(struct nfs_server *server)
534 struct nfs_client *clp = server->nfs_client;
535 struct nfs4_state_owner *sp, *tmp;
536 unsigned long time_min, time_max;
539 spin_lock(&clp->cl_lock);
541 time_min = (long)time_max - (long)clp->cl_lease_time;
542 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
543 /* NB: LRU is sorted so that oldest is at the head */
544 if (time_in_range(sp->so_expires, time_min, time_max))
546 list_move(&sp->so_lru, &doomed);
547 nfs4_remove_state_owner_locked(sp);
549 spin_unlock(&clp->cl_lock);
551 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
552 list_del(&sp->so_lru);
553 nfs4_free_state_owner(sp);
558 * nfs4_get_state_owner - Look up a state owner given a credential
559 * @server: nfs_server to search
560 * @cred: RPC credential to match
562 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
564 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
565 struct rpc_cred *cred,
568 struct nfs_client *clp = server->nfs_client;
569 struct nfs4_state_owner *sp, *new;
571 spin_lock(&clp->cl_lock);
572 sp = nfs4_find_state_owner_locked(server, cred);
573 spin_unlock(&clp->cl_lock);
576 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
580 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
582 spin_lock(&clp->cl_lock);
583 sp = nfs4_insert_state_owner_locked(new);
584 spin_unlock(&clp->cl_lock);
585 } while (sp == ERR_PTR(-EAGAIN));
587 nfs4_free_state_owner(new);
589 nfs4_gc_state_owners(server);
594 * nfs4_put_state_owner - Release a nfs4_state_owner
595 * @sp: state owner data to release
597 * Note that we keep released state owners on an LRU
599 * This caches valid state owners so that they can be
600 * reused, to avoid the OPEN_CONFIRM on minor version 0.
601 * It also pins the uniquifier of dropped state owners for
602 * a while, to ensure that those state owner names are
605 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
607 struct nfs_server *server = sp->so_server;
608 struct nfs_client *clp = server->nfs_client;
610 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
613 sp->so_expires = jiffies;
614 list_add_tail(&sp->so_lru, &server->state_owners_lru);
615 spin_unlock(&clp->cl_lock);
619 * nfs4_purge_state_owners - Release all cached state owners
620 * @server: nfs_server with cached state owners to release
621 * @head: resulting list of state owners
623 * Called at umount time. Remaining state owners will be on
624 * the LRU with ref count of zero.
625 * Note that the state owners are not freed, but are added
626 * to the list @head, which can later be used as an argument
627 * to nfs4_free_state_owners.
629 void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
631 struct nfs_client *clp = server->nfs_client;
632 struct nfs4_state_owner *sp, *tmp;
634 spin_lock(&clp->cl_lock);
635 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
636 list_move(&sp->so_lru, head);
637 nfs4_remove_state_owner_locked(sp);
639 spin_unlock(&clp->cl_lock);
643 * nfs4_purge_state_owners - Release all cached state owners
644 * @head: resulting list of state owners
646 * Frees a list of state owners that was generated by
647 * nfs4_purge_state_owners
649 void nfs4_free_state_owners(struct list_head *head)
651 struct nfs4_state_owner *sp, *tmp;
653 list_for_each_entry_safe(sp, tmp, head, so_lru) {
654 list_del(&sp->so_lru);
655 nfs4_free_state_owner(sp);
659 static struct nfs4_state *
660 nfs4_alloc_open_state(void)
662 struct nfs4_state *state;
664 state = kzalloc(sizeof(*state), GFP_NOFS);
667 atomic_set(&state->count, 1);
668 INIT_LIST_HEAD(&state->lock_states);
669 spin_lock_init(&state->state_lock);
670 seqlock_init(&state->seqlock);
675 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
677 if (state->state == fmode)
679 /* NB! List reordering - see the reclaim code for why. */
680 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
681 if (fmode & FMODE_WRITE)
682 list_move(&state->open_states, &state->owner->so_states);
684 list_move_tail(&state->open_states, &state->owner->so_states);
686 state->state = fmode;
689 static struct nfs4_state *
690 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
692 struct nfs_inode *nfsi = NFS_I(inode);
693 struct nfs4_state *state;
695 list_for_each_entry(state, &nfsi->open_states, inode_states) {
696 if (state->owner != owner)
698 if (!nfs4_valid_open_stateid(state))
700 if (atomic_inc_not_zero(&state->count))
707 nfs4_free_open_state(struct nfs4_state *state)
713 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
715 struct nfs4_state *state, *new;
716 struct nfs_inode *nfsi = NFS_I(inode);
718 spin_lock(&inode->i_lock);
719 state = __nfs4_find_state_byowner(inode, owner);
720 spin_unlock(&inode->i_lock);
723 new = nfs4_alloc_open_state();
724 spin_lock(&owner->so_lock);
725 spin_lock(&inode->i_lock);
726 state = __nfs4_find_state_byowner(inode, owner);
727 if (state == NULL && new != NULL) {
729 state->owner = owner;
730 atomic_inc(&owner->so_count);
731 list_add(&state->inode_states, &nfsi->open_states);
733 state->inode = inode;
734 spin_unlock(&inode->i_lock);
735 /* Note: The reclaim code dictates that we add stateless
736 * and read-only stateids to the end of the list */
737 list_add_tail(&state->open_states, &owner->so_states);
738 spin_unlock(&owner->so_lock);
740 spin_unlock(&inode->i_lock);
741 spin_unlock(&owner->so_lock);
743 nfs4_free_open_state(new);
749 void nfs4_put_open_state(struct nfs4_state *state)
751 struct inode *inode = state->inode;
752 struct nfs4_state_owner *owner = state->owner;
754 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
756 spin_lock(&inode->i_lock);
757 list_del(&state->inode_states);
758 list_del(&state->open_states);
759 spin_unlock(&inode->i_lock);
760 spin_unlock(&owner->so_lock);
762 nfs4_free_open_state(state);
763 nfs4_put_state_owner(owner);
767 * Close the current file.
769 static void __nfs4_close(struct nfs4_state *state,
770 fmode_t fmode, gfp_t gfp_mask, int wait)
772 struct nfs4_state_owner *owner = state->owner;
776 atomic_inc(&owner->so_count);
777 /* Protect against nfs4_find_state() */
778 spin_lock(&owner->so_lock);
779 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
786 case FMODE_READ|FMODE_WRITE:
789 newstate = FMODE_READ|FMODE_WRITE;
790 if (state->n_rdwr == 0) {
791 if (state->n_rdonly == 0) {
792 newstate &= ~FMODE_READ;
793 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
794 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
796 if (state->n_wronly == 0) {
797 newstate &= ~FMODE_WRITE;
798 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
799 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
802 clear_bit(NFS_DELEGATED_STATE, &state->flags);
804 nfs4_state_set_mode_locked(state, newstate);
805 spin_unlock(&owner->so_lock);
808 nfs4_put_open_state(state);
809 nfs4_put_state_owner(owner);
811 nfs4_do_close(state, gfp_mask, wait);
814 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
816 __nfs4_close(state, fmode, GFP_NOFS, 0);
819 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
821 __nfs4_close(state, fmode, GFP_KERNEL, 1);
825 * Search the state->lock_states for an existing lock_owner
826 * that is compatible with either of the given owners.
827 * If the second is non-zero, then the first refers to a Posix-lock
828 * owner (current->files) and the second refers to a flock/OFD
829 * owner (struct file*). In that case, prefer a match for the first
831 * If both sorts of locks are held on the one file we cannot know
832 * which stateid was intended to be used, so a "correct" choice cannot
833 * be made. Failing that, a "consistent" choice is preferable. The
834 * consistent choice we make is to prefer the first owner, that of a
837 static struct nfs4_lock_state *
838 __nfs4_find_lock_state(struct nfs4_state *state,
839 fl_owner_t fl_owner, fl_owner_t fl_owner2)
841 struct nfs4_lock_state *pos, *ret = NULL;
842 list_for_each_entry(pos, &state->lock_states, ls_locks) {
843 if (pos->ls_owner == fl_owner) {
847 if (pos->ls_owner == fl_owner2)
851 atomic_inc(&ret->ls_count);
856 * Return a compatible lock_state. If no initialized lock_state structure
857 * exists, return an uninitialized one.
860 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
862 struct nfs4_lock_state *lsp;
863 struct nfs_server *server = state->owner->so_server;
865 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
868 nfs4_init_seqid_counter(&lsp->ls_seqid);
869 atomic_set(&lsp->ls_count, 1);
870 lsp->ls_state = state;
871 lsp->ls_owner = fl_owner;
872 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
873 if (lsp->ls_seqid.owner_id < 0)
875 INIT_LIST_HEAD(&lsp->ls_locks);
882 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
884 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
885 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
890 * Return a compatible lock_state. If no initialized lock_state structure
891 * exists, return an uninitialized one.
894 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
896 struct nfs4_lock_state *lsp, *new = NULL;
899 spin_lock(&state->state_lock);
900 lsp = __nfs4_find_lock_state(state, owner, NULL);
904 list_add(&new->ls_locks, &state->lock_states);
905 set_bit(LK_STATE_IN_USE, &state->flags);
910 spin_unlock(&state->state_lock);
911 new = nfs4_alloc_lock_state(state, owner);
915 spin_unlock(&state->state_lock);
917 nfs4_free_lock_state(state->owner->so_server, new);
922 * Release reference to lock_state, and free it if we see that
923 * it is no longer in use
925 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
927 struct nfs_server *server;
928 struct nfs4_state *state;
932 state = lsp->ls_state;
933 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
935 list_del(&lsp->ls_locks);
936 if (list_empty(&state->lock_states))
937 clear_bit(LK_STATE_IN_USE, &state->flags);
938 spin_unlock(&state->state_lock);
939 server = state->owner->so_server;
940 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
941 struct nfs_client *clp = server->nfs_client;
943 clp->cl_mvops->free_lock_state(server, lsp);
945 nfs4_free_lock_state(server, lsp);
948 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
950 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
952 dst->fl_u.nfs4_fl.owner = lsp;
953 atomic_inc(&lsp->ls_count);
956 static void nfs4_fl_release_lock(struct file_lock *fl)
958 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
961 static const struct file_lock_operations nfs4_fl_lock_ops = {
962 .fl_copy_lock = nfs4_fl_copy_lock,
963 .fl_release_private = nfs4_fl_release_lock,
966 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
968 struct nfs4_lock_state *lsp;
970 if (fl->fl_ops != NULL)
972 lsp = nfs4_get_lock_state(state, fl->fl_owner);
975 fl->fl_u.nfs4_fl.owner = lsp;
976 fl->fl_ops = &nfs4_fl_lock_ops;
980 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
981 struct nfs4_state *state,
982 const struct nfs_lock_context *l_ctx)
984 struct nfs4_lock_state *lsp;
985 fl_owner_t fl_owner, fl_flock_owner;
991 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
994 fl_owner = l_ctx->lockowner;
995 fl_flock_owner = l_ctx->open_context->flock_owner;
997 spin_lock(&state->state_lock);
998 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
999 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
1001 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1002 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1005 spin_unlock(&state->state_lock);
1006 nfs4_put_lock_state(lsp);
1011 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1013 const nfs4_stateid *src;
1017 src = &zero_stateid;
1018 seq = read_seqbegin(&state->seqlock);
1019 if (test_bit(NFS_OPEN_STATE, &state->flags))
1020 src = &state->open_stateid;
1021 nfs4_stateid_copy(dst, src);
1022 } while (read_seqretry(&state->seqlock, seq));
1026 * Byte-range lock aware utility to initialize the stateid of read/write
1029 int nfs4_select_rw_stateid(struct nfs4_state *state,
1030 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1031 nfs4_stateid *dst, struct rpc_cred **cred)
1035 if (!nfs4_valid_open_stateid(state))
1039 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1041 /* A lost lock - don't even consider delegations */
1043 /* returns true if delegation stateid found and copied */
1044 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1049 /* nfs4_copy_delegation_stateid() didn't over-write
1050 * dst, so it still has the lock stateid which we now
1054 nfs4_copy_open_stateid(dst, state);
1057 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1062 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1064 struct nfs_seqid *new;
1066 new = kmalloc(sizeof(*new), gfp_mask);
1068 return ERR_PTR(-ENOMEM);
1069 new->sequence = counter;
1070 INIT_LIST_HEAD(&new->list);
1075 void nfs_release_seqid(struct nfs_seqid *seqid)
1077 struct nfs_seqid_counter *sequence;
1079 if (seqid == NULL || list_empty(&seqid->list))
1081 sequence = seqid->sequence;
1082 spin_lock(&sequence->lock);
1083 list_del_init(&seqid->list);
1084 if (!list_empty(&sequence->list)) {
1085 struct nfs_seqid *next;
1087 next = list_first_entry(&sequence->list,
1088 struct nfs_seqid, list);
1089 rpc_wake_up_queued_task(&sequence->wait, next->task);
1091 spin_unlock(&sequence->lock);
1094 void nfs_free_seqid(struct nfs_seqid *seqid)
1096 nfs_release_seqid(seqid);
1101 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1102 * failed with a seqid incrementing error -
1103 * see comments nfs4.h:seqid_mutating_error()
1105 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1110 case -NFS4ERR_BAD_SEQID:
1111 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1113 pr_warn_ratelimited("NFS: v4 server returned a bad"
1114 " sequence-id error on an"
1115 " unconfirmed sequence %p!\n",
1117 case -NFS4ERR_STALE_CLIENTID:
1118 case -NFS4ERR_STALE_STATEID:
1119 case -NFS4ERR_BAD_STATEID:
1120 case -NFS4ERR_BADXDR:
1121 case -NFS4ERR_RESOURCE:
1122 case -NFS4ERR_NOFILEHANDLE:
1123 case -NFS4ERR_MOVED:
1124 /* Non-seqid mutating errors */
1128 * Note: no locking needed as we are guaranteed to be first
1129 * on the sequence list
1131 seqid->sequence->counter++;
1134 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1136 struct nfs4_state_owner *sp;
1141 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1142 if (status == -NFS4ERR_BAD_SEQID)
1143 nfs4_reset_state_owner(sp);
1144 if (!nfs4_has_session(sp->so_server->nfs_client))
1145 nfs_increment_seqid(status, seqid);
1149 * Increment the seqid if the LOCK/LOCKU succeeded, or
1150 * failed with a seqid incrementing error -
1151 * see comments nfs4.h:seqid_mutating_error()
1153 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1156 nfs_increment_seqid(status, seqid);
1159 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1161 struct nfs_seqid_counter *sequence;
1166 sequence = seqid->sequence;
1167 spin_lock(&sequence->lock);
1169 if (list_empty(&seqid->list))
1170 list_add_tail(&seqid->list, &sequence->list);
1171 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1173 rpc_sleep_on(&sequence->wait, task, NULL);
1176 spin_unlock(&sequence->lock);
1181 static int nfs4_run_state_manager(void *);
1183 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1185 smp_mb__before_atomic();
1186 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1187 smp_mb__after_atomic();
1188 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1189 rpc_wake_up(&clp->cl_rpcwaitq);
1193 * Schedule the nfs_client asynchronous state management routine
1195 void nfs4_schedule_state_manager(struct nfs_client *clp)
1197 struct task_struct *task;
1198 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1200 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1202 __module_get(THIS_MODULE);
1203 atomic_inc(&clp->cl_count);
1205 /* The rcu_read_lock() is not strictly necessary, as the state
1206 * manager is the only thread that ever changes the rpc_xprt
1207 * after it's initialized. At this point, we're single threaded. */
1209 snprintf(buf, sizeof(buf), "%s-manager",
1210 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1212 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1214 printk(KERN_ERR "%s: kthread_run: %ld\n",
1215 __func__, PTR_ERR(task));
1216 if (!nfs_client_init_is_complete(clp))
1217 nfs_mark_client_ready(clp, PTR_ERR(task));
1218 nfs4_clear_state_manager_bit(clp);
1219 nfs_put_client(clp);
1220 module_put(THIS_MODULE);
1225 * Schedule a lease recovery attempt
1227 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1231 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1232 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1233 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1235 nfs4_schedule_state_manager(clp);
1237 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1240 * nfs4_schedule_migration_recovery - trigger migration recovery
1242 * @server: FSID that is migrating
1244 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1245 * value is returned.
1247 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1249 struct nfs_client *clp = server->nfs_client;
1251 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1252 pr_err("NFS: volatile file handles not supported (server %s)\n",
1257 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1260 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1262 (unsigned long long)server->fsid.major,
1263 (unsigned long long)server->fsid.minor,
1266 set_bit(NFS_MIG_IN_TRANSITION,
1267 &((struct nfs_server *)server)->mig_status);
1268 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1270 nfs4_schedule_state_manager(clp);
1273 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1276 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1278 * @clp: server to check for moved leases
1281 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1283 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1284 __func__, clp->cl_clientid, clp->cl_hostname);
1286 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1287 nfs4_schedule_state_manager(clp);
1289 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1291 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1297 atomic_inc(&clp->cl_count);
1298 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1299 nfs_wait_bit_killable, TASK_KILLABLE);
1302 if (clp->cl_cons_state < 0)
1303 res = clp->cl_cons_state;
1305 nfs_put_client(clp);
1309 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1314 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1315 ret = nfs4_wait_clnt_recover(clp);
1318 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1319 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1321 nfs4_schedule_state_manager(clp);
1328 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1329 * @clp: client to process
1331 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1332 * resend of the SETCLIENTID and hence re-establish the
1333 * callback channel. Then return all existing delegations.
1335 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1337 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1338 nfs_expire_all_delegations(clp);
1339 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1343 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1345 nfs40_handle_cb_pathdown(clp);
1346 nfs4_schedule_state_manager(clp);
1349 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1352 if (!nfs4_valid_open_stateid(state))
1354 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1355 /* Don't recover state that expired before the reboot */
1356 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1357 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1360 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1361 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1365 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1367 if (!nfs4_valid_open_stateid(state))
1369 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1370 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1371 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1372 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1376 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1378 struct nfs_client *clp = server->nfs_client;
1380 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1382 nfs_inode_find_delegation_state_and_recover(state->inode,
1384 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1386 nfs4_schedule_state_manager(clp);
1389 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1391 static struct nfs4_lock_state *
1392 nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1393 const nfs4_stateid *stateid)
1395 struct nfs4_lock_state *pos;
1397 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1398 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1400 if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
1406 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1407 const nfs4_stateid *stateid)
1411 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1412 spin_lock(&state->state_lock);
1413 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1415 spin_unlock(&state->state_lock);
1420 void nfs_inode_find_state_and_recover(struct inode *inode,
1421 const nfs4_stateid *stateid)
1423 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1424 struct nfs_inode *nfsi = NFS_I(inode);
1425 struct nfs_open_context *ctx;
1426 struct nfs4_state *state;
1429 spin_lock(&inode->i_lock);
1430 list_for_each_entry(ctx, &nfsi->open_files, list) {
1434 if (nfs4_stateid_match_other(&state->stateid, stateid) &&
1435 nfs4_state_mark_reclaim_nograce(clp, state)) {
1439 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1440 nfs4_state_mark_reclaim_nograce(clp, state))
1443 spin_unlock(&inode->i_lock);
1445 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1447 nfs4_schedule_state_manager(clp);
1450 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1452 struct inode *inode = state->inode;
1453 struct nfs_inode *nfsi = NFS_I(inode);
1454 struct nfs_open_context *ctx;
1456 spin_lock(&inode->i_lock);
1457 list_for_each_entry(ctx, &nfsi->open_files, list) {
1458 if (ctx->state != state)
1460 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1462 spin_unlock(&inode->i_lock);
1465 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1467 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1468 nfs4_state_mark_open_context_bad(state);
1472 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1474 struct inode *inode = state->inode;
1475 struct nfs_inode *nfsi = NFS_I(inode);
1476 struct file_lock *fl;
1477 struct nfs4_lock_state *lsp;
1479 struct file_lock_context *flctx = inode->i_flctx;
1480 struct list_head *list;
1485 list = &flctx->flc_posix;
1487 /* Guard against delegation returns and new lock/unlock calls */
1488 down_write(&nfsi->rwsem);
1489 spin_lock(&flctx->flc_lock);
1491 list_for_each_entry(fl, list, fl_list) {
1492 if (nfs_file_open_context(fl->fl_file)->state != state)
1494 spin_unlock(&flctx->flc_lock);
1495 status = ops->recover_lock(state, fl);
1500 case -NFS4ERR_ADMIN_REVOKED:
1501 case -NFS4ERR_STALE_STATEID:
1502 case -NFS4ERR_BAD_STATEID:
1503 case -NFS4ERR_EXPIRED:
1504 case -NFS4ERR_NO_GRACE:
1505 case -NFS4ERR_STALE_CLIENTID:
1506 case -NFS4ERR_BADSESSION:
1507 case -NFS4ERR_BADSLOT:
1508 case -NFS4ERR_BAD_HIGH_SLOT:
1509 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1512 pr_err("NFS: %s: unhandled error %d\n",
1515 case -NFS4ERR_DENIED:
1516 case -NFS4ERR_RECLAIM_BAD:
1517 case -NFS4ERR_RECLAIM_CONFLICT:
1518 lsp = fl->fl_u.nfs4_fl.owner;
1520 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1523 spin_lock(&flctx->flc_lock);
1525 if (list == &flctx->flc_posix) {
1526 list = &flctx->flc_flock;
1529 spin_unlock(&flctx->flc_lock);
1531 up_write(&nfsi->rwsem);
1535 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1537 struct nfs4_state *state;
1538 struct nfs4_lock_state *lock;
1541 /* Note: we rely on the sp->so_states list being ordered
1542 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1544 * This is needed to ensure that the server won't give us any
1545 * read delegations that we have to return if, say, we are
1546 * recovering after a network partition or a reboot from a
1547 * server that doesn't support a grace period.
1549 spin_lock(&sp->so_lock);
1550 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1552 list_for_each_entry(state, &sp->so_states, open_states) {
1553 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1555 if (!nfs4_valid_open_stateid(state))
1557 if (state->state == 0)
1559 atomic_inc(&state->count);
1560 spin_unlock(&sp->so_lock);
1561 status = ops->recover_open(sp, state);
1563 status = nfs4_reclaim_locks(state, ops);
1565 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1566 spin_lock(&state->state_lock);
1567 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1568 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1569 pr_warn_ratelimited("NFS: "
1571 "failed!\n", __func__);
1573 spin_unlock(&state->state_lock);
1575 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
1577 nfs4_put_open_state(state);
1578 spin_lock(&sp->so_lock);
1584 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1592 /* Open state on this file cannot be recovered */
1593 nfs4_state_mark_recovery_failed(state, status);
1597 case -NFS4ERR_ADMIN_REVOKED:
1598 case -NFS4ERR_STALE_STATEID:
1599 case -NFS4ERR_OLD_STATEID:
1600 case -NFS4ERR_BAD_STATEID:
1601 case -NFS4ERR_RECLAIM_BAD:
1602 case -NFS4ERR_RECLAIM_CONFLICT:
1603 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1605 case -NFS4ERR_EXPIRED:
1606 case -NFS4ERR_NO_GRACE:
1607 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1608 case -NFS4ERR_STALE_CLIENTID:
1609 case -NFS4ERR_BADSESSION:
1610 case -NFS4ERR_BADSLOT:
1611 case -NFS4ERR_BAD_HIGH_SLOT:
1612 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1615 nfs4_put_open_state(state);
1616 spin_lock(&sp->so_lock);
1619 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1620 spin_unlock(&sp->so_lock);
1623 nfs4_put_open_state(state);
1624 spin_lock(&sp->so_lock);
1625 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1626 spin_unlock(&sp->so_lock);
1630 static void nfs4_clear_open_state(struct nfs4_state *state)
1632 struct nfs4_lock_state *lock;
1634 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1635 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1636 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1637 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1638 spin_lock(&state->state_lock);
1639 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1640 lock->ls_seqid.flags = 0;
1641 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1643 spin_unlock(&state->state_lock);
1646 static void nfs4_reset_seqids(struct nfs_server *server,
1647 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1649 struct nfs_client *clp = server->nfs_client;
1650 struct nfs4_state_owner *sp;
1651 struct rb_node *pos;
1652 struct nfs4_state *state;
1654 spin_lock(&clp->cl_lock);
1655 for (pos = rb_first(&server->state_owners);
1657 pos = rb_next(pos)) {
1658 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1659 sp->so_seqid.flags = 0;
1660 spin_lock(&sp->so_lock);
1661 list_for_each_entry(state, &sp->so_states, open_states) {
1662 if (mark_reclaim(clp, state))
1663 nfs4_clear_open_state(state);
1665 spin_unlock(&sp->so_lock);
1667 spin_unlock(&clp->cl_lock);
1670 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1671 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1673 struct nfs_server *server;
1676 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1677 nfs4_reset_seqids(server, mark_reclaim);
1681 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1683 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1684 /* Mark all delegations for reclaim */
1685 nfs_delegation_mark_reclaim(clp);
1686 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1689 static int nfs4_reclaim_complete(struct nfs_client *clp,
1690 const struct nfs4_state_recovery_ops *ops,
1691 struct rpc_cred *cred)
1693 /* Notify the server we're done reclaiming our state */
1694 if (ops->reclaim_complete)
1695 return ops->reclaim_complete(clp, cred);
1699 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1701 struct nfs_client *clp = server->nfs_client;
1702 struct nfs4_state_owner *sp;
1703 struct rb_node *pos;
1704 struct nfs4_state *state;
1706 spin_lock(&clp->cl_lock);
1707 for (pos = rb_first(&server->state_owners);
1709 pos = rb_next(pos)) {
1710 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1711 spin_lock(&sp->so_lock);
1712 list_for_each_entry(state, &sp->so_states, open_states) {
1713 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1716 nfs4_state_mark_reclaim_nograce(clp, state);
1718 spin_unlock(&sp->so_lock);
1720 spin_unlock(&clp->cl_lock);
1723 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1725 struct nfs_server *server;
1727 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1731 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1732 nfs4_clear_reclaim_server(server);
1735 nfs_delegation_reap_unclaimed(clp);
1739 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1741 const struct nfs4_state_recovery_ops *ops;
1742 struct rpc_cred *cred;
1745 if (!nfs4_state_clear_reclaim_reboot(clp))
1747 ops = clp->cl_mvops->reboot_recovery_ops;
1748 cred = nfs4_get_clid_cred(clp);
1749 err = nfs4_reclaim_complete(clp, ops, cred);
1751 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1752 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1755 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1757 nfs_mark_test_expired_all_delegations(clp);
1758 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1761 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1766 case -NFS4ERR_CB_PATH_DOWN:
1767 nfs40_handle_cb_pathdown(clp);
1769 case -NFS4ERR_NO_GRACE:
1770 nfs4_state_end_reclaim_reboot(clp);
1772 case -NFS4ERR_STALE_CLIENTID:
1773 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1774 nfs4_state_start_reclaim_reboot(clp);
1776 case -NFS4ERR_EXPIRED:
1777 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1778 nfs4_state_start_reclaim_nograce(clp);
1780 case -NFS4ERR_BADSESSION:
1781 case -NFS4ERR_BADSLOT:
1782 case -NFS4ERR_BAD_HIGH_SLOT:
1783 case -NFS4ERR_DEADSESSION:
1784 case -NFS4ERR_SEQ_FALSE_RETRY:
1785 case -NFS4ERR_SEQ_MISORDERED:
1786 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1787 /* Zero session reset errors */
1789 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1790 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1793 dprintk("%s: failed to handle error %d for server %s\n",
1794 __func__, error, clp->cl_hostname);
1797 dprintk("%s: handled error %d for server %s\n", __func__, error,
1802 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1804 struct nfs4_state_owner *sp;
1805 struct nfs_server *server;
1806 struct rb_node *pos;
1812 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1813 nfs4_purge_state_owners(server, &freeme);
1814 spin_lock(&clp->cl_lock);
1815 for (pos = rb_first(&server->state_owners);
1817 pos = rb_next(pos)) {
1819 struct nfs4_state_owner, so_server_node);
1820 if (!test_and_clear_bit(ops->owner_flag_bit,
1823 if (!atomic_inc_not_zero(&sp->so_count))
1825 spin_unlock(&clp->cl_lock);
1828 status = nfs4_reclaim_open_state(sp, ops);
1830 set_bit(ops->owner_flag_bit, &sp->so_flags);
1831 nfs4_put_state_owner(sp);
1832 status = nfs4_recovery_handle_error(clp, status);
1833 return (status != 0) ? status : -EAGAIN;
1836 nfs4_put_state_owner(sp);
1839 spin_unlock(&clp->cl_lock);
1842 nfs4_free_state_owners(&freeme);
1846 static int nfs4_check_lease(struct nfs_client *clp)
1848 struct rpc_cred *cred;
1849 const struct nfs4_state_maintenance_ops *ops =
1850 clp->cl_mvops->state_renewal_ops;
1853 /* Is the client already known to have an expired lease? */
1854 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1856 spin_lock(&clp->cl_lock);
1857 cred = ops->get_state_renewal_cred_locked(clp);
1858 spin_unlock(&clp->cl_lock);
1860 cred = nfs4_get_clid_cred(clp);
1865 status = ops->renew_lease(clp, cred);
1867 if (status == -ETIMEDOUT) {
1868 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1872 return nfs4_recovery_handle_error(clp, status);
1875 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1876 * and for recoverable errors on EXCHANGE_ID for v4.1
1878 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1881 case -NFS4ERR_SEQ_MISORDERED:
1882 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1883 return -ESERVERFAULT;
1884 /* Lease confirmation error: retry after purging the lease */
1886 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1888 case -NFS4ERR_STALE_CLIENTID:
1889 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1890 nfs4_state_start_reclaim_reboot(clp);
1892 case -NFS4ERR_CLID_INUSE:
1893 pr_err("NFS: Server %s reports our clientid is in use\n",
1895 nfs_mark_client_ready(clp, -EPERM);
1896 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1899 case -NFS4ERR_DELAY:
1905 case -NFS4ERR_MINOR_VERS_MISMATCH:
1906 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1907 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1908 dprintk("%s: exit with error %d for server %s\n",
1909 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1910 return -EPROTONOSUPPORT;
1911 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1912 * in nfs4_exchange_id */
1914 dprintk("%s: exit with error %d for server %s\n", __func__,
1915 status, clp->cl_hostname);
1918 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1919 dprintk("%s: handled error %d for server %s\n", __func__, status,
1924 static int nfs4_establish_lease(struct nfs_client *clp)
1926 struct rpc_cred *cred;
1927 const struct nfs4_state_recovery_ops *ops =
1928 clp->cl_mvops->reboot_recovery_ops;
1931 nfs4_begin_drain_session(clp);
1932 cred = nfs4_get_clid_cred(clp);
1935 status = ops->establish_clid(clp, cred);
1939 pnfs_destroy_all_layouts(clp);
1944 * Returns zero or a negative errno. NFS4ERR values are converted
1945 * to local errno values.
1947 static int nfs4_reclaim_lease(struct nfs_client *clp)
1951 status = nfs4_establish_lease(clp);
1953 return nfs4_handle_reclaim_lease_error(clp, status);
1954 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1955 nfs4_state_start_reclaim_nograce(clp);
1956 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1957 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1958 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1959 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1963 static int nfs4_purge_lease(struct nfs_client *clp)
1967 status = nfs4_establish_lease(clp);
1969 return nfs4_handle_reclaim_lease_error(clp, status);
1970 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1971 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1972 nfs4_state_start_reclaim_nograce(clp);
1977 * Try remote migration of one FSID from a source server to a
1978 * destination server. The source server provides a list of
1979 * potential destinations.
1981 * Returns zero or a negative NFS4ERR status code.
1983 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1985 struct nfs_client *clp = server->nfs_client;
1986 struct nfs4_fs_locations *locations = NULL;
1987 struct inode *inode;
1991 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1992 (unsigned long long)server->fsid.major,
1993 (unsigned long long)server->fsid.minor,
1997 page = alloc_page(GFP_KERNEL);
1998 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1999 if (page == NULL || locations == NULL) {
2000 dprintk("<-- %s: no memory\n", __func__);
2004 inode = d_inode(server->super->s_root);
2005 result = nfs4_proc_get_locations(inode, locations, page, cred);
2007 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2012 result = -NFS4ERR_NXIO;
2013 if (!locations->nlocations)
2016 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2017 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2022 nfs4_begin_drain_session(clp);
2024 status = nfs4_replace_transport(server, locations);
2026 dprintk("<-- %s: failed to replace transport: %d\n",
2032 dprintk("<-- %s: migration succeeded\n", __func__);
2039 pr_err("NFS: migration recovery failed (server %s)\n",
2041 set_bit(NFS_MIG_FAILED, &server->mig_status);
2047 * Returns zero or a negative NFS4ERR status code.
2049 static int nfs4_handle_migration(struct nfs_client *clp)
2051 const struct nfs4_state_maintenance_ops *ops =
2052 clp->cl_mvops->state_renewal_ops;
2053 struct nfs_server *server;
2054 struct rpc_cred *cred;
2056 dprintk("%s: migration reported on \"%s\"\n", __func__,
2059 spin_lock(&clp->cl_lock);
2060 cred = ops->get_state_renewal_cred_locked(clp);
2061 spin_unlock(&clp->cl_lock);
2063 return -NFS4ERR_NOENT;
2068 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2071 if (server->mig_gen == clp->cl_mig_gen)
2073 server->mig_gen = clp->cl_mig_gen;
2075 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2076 &server->mig_status))
2080 status = nfs4_try_migration(server, cred);
2093 * Test each nfs_server on the clp's cl_superblocks list to see
2094 * if it's moved to another server. Stop when the server no longer
2095 * returns NFS4ERR_LEASE_MOVED.
2097 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2099 const struct nfs4_state_maintenance_ops *ops =
2100 clp->cl_mvops->state_renewal_ops;
2101 struct nfs_server *server;
2102 struct rpc_cred *cred;
2104 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2107 spin_lock(&clp->cl_lock);
2108 cred = ops->get_state_renewal_cred_locked(clp);
2109 spin_unlock(&clp->cl_lock);
2111 return -NFS4ERR_NOENT;
2116 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2117 struct inode *inode;
2120 if (server->mig_gen == clp->cl_mig_gen)
2122 server->mig_gen = clp->cl_mig_gen;
2126 inode = d_inode(server->super->s_root);
2127 status = nfs4_proc_fsid_present(inode, cred);
2128 if (status != -NFS4ERR_MOVED)
2129 goto restart; /* wasn't this one */
2130 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2131 goto restart; /* there are more */
2142 * nfs4_discover_server_trunking - Detect server IP address trunking
2144 * @clp: nfs_client under test
2145 * @result: OUT: found nfs_client, or clp
2147 * Returns zero or a negative errno. If zero is returned,
2148 * an nfs_client pointer is planted in "result".
2150 * Note: since we are invoked in process context, and
2151 * not from inside the state manager, we cannot use
2152 * nfs4_handle_reclaim_lease_error().
2154 int nfs4_discover_server_trunking(struct nfs_client *clp,
2155 struct nfs_client **result)
2157 const struct nfs4_state_recovery_ops *ops =
2158 clp->cl_mvops->reboot_recovery_ops;
2159 struct rpc_clnt *clnt;
2160 struct rpc_cred *cred;
2163 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2165 clnt = clp->cl_rpcclient;
2168 mutex_lock(&nfs_clid_init_mutex);
2171 cred = nfs4_get_clid_cred(clp);
2175 status = ops->detect_trunking(clp, result, cred);
2183 if (clnt->cl_softrtry)
2185 case -NFS4ERR_DELAY:
2188 case -NFS4ERR_STALE_CLIENTID:
2189 dprintk("NFS: %s after status %d, retrying\n",
2194 nfs4_root_machine_cred(clp);
2197 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2199 case -NFS4ERR_CLID_INUSE:
2200 case -NFS4ERR_WRONGSEC:
2201 /* No point in retrying if we already used RPC_AUTH_UNIX */
2202 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2206 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2208 status = PTR_ERR(clnt);
2211 /* Note: this is safe because we haven't yet marked the
2212 * client as ready, so we are the only user of
2215 clnt = xchg(&clp->cl_rpcclient, clnt);
2216 rpc_shutdown_client(clnt);
2217 clnt = clp->cl_rpcclient;
2220 case -NFS4ERR_MINOR_VERS_MISMATCH:
2221 status = -EPROTONOSUPPORT;
2225 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2226 * in nfs4_exchange_id */
2227 status = -EKEYEXPIRED;
2230 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2236 mutex_unlock(&nfs_clid_init_mutex);
2237 dprintk("NFS: %s: status = %d\n", __func__, status);
2241 #ifdef CONFIG_NFS_V4_1
2242 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2244 struct nfs_client *clp = session->clp;
2248 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2250 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2251 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2253 nfs4_schedule_state_manager(clp);
2255 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2257 void nfs41_notify_server(struct nfs_client *clp)
2259 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2260 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2261 nfs4_schedule_state_manager(clp);
2264 static void nfs4_reset_all_state(struct nfs_client *clp)
2266 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2267 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2268 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2269 nfs4_state_start_reclaim_nograce(clp);
2270 dprintk("%s: scheduling reset of all state for server %s!\n",
2271 __func__, clp->cl_hostname);
2272 nfs4_schedule_state_manager(clp);
2276 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2278 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2279 nfs4_state_start_reclaim_reboot(clp);
2280 dprintk("%s: server %s rebooted!\n", __func__,
2282 nfs4_schedule_state_manager(clp);
2286 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2288 nfs4_reset_all_state(clp);
2289 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2292 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2294 nfs4_state_start_reclaim_nograce(clp);
2295 nfs4_schedule_state_manager(clp);
2297 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2300 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2302 /* FIXME: For now, we destroy all layouts. */
2303 pnfs_destroy_all_layouts(clp);
2304 /* FIXME: For now, we test all delegations+open state+locks. */
2305 nfs41_handle_some_state_revoked(clp);
2306 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2310 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2312 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2313 nfs4_schedule_state_manager(clp);
2315 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2319 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2321 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2322 &clp->cl_state) == 0)
2323 nfs4_schedule_state_manager(clp);
2326 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2332 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2333 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2335 * If we're called from the state manager thread, then assume we're
2336 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2337 * Those flags are expected to remain set until we're done
2338 * recovering (see RFC5661, section 18.46.3).
2343 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2344 nfs41_handle_server_reboot(clp);
2345 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2346 nfs41_handle_all_state_revoked(clp);
2347 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2348 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2349 nfs41_handle_some_state_revoked(clp);
2350 if (flags & SEQ4_STATUS_LEASE_MOVED)
2351 nfs4_schedule_lease_moved_recovery(clp);
2352 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2353 nfs41_handle_recallable_state_revoked(clp);
2355 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2356 nfs41_handle_backchannel_fault(clp);
2357 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2358 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2359 nfs41_handle_cb_path_down(clp);
2362 static int nfs4_reset_session(struct nfs_client *clp)
2364 struct rpc_cred *cred;
2367 if (!nfs4_has_session(clp))
2369 nfs4_begin_drain_session(clp);
2370 cred = nfs4_get_clid_cred(clp);
2371 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2374 case -NFS4ERR_BADSESSION:
2375 case -NFS4ERR_DEADSESSION:
2377 case -NFS4ERR_BACK_CHAN_BUSY:
2378 case -NFS4ERR_DELAY:
2379 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2384 status = nfs4_recovery_handle_error(clp, status);
2388 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2389 status = nfs4_proc_create_session(clp, cred);
2391 dprintk("%s: session reset failed with status %d for server %s!\n",
2392 __func__, status, clp->cl_hostname);
2393 status = nfs4_handle_reclaim_lease_error(clp, status);
2396 nfs41_finish_session_reset(clp);
2397 dprintk("%s: session reset was successful for server %s!\n",
2398 __func__, clp->cl_hostname);
2405 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2407 struct rpc_cred *cred;
2410 if (!nfs4_has_session(clp))
2412 nfs4_begin_drain_session(clp);
2413 cred = nfs4_get_clid_cred(clp);
2414 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2417 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2420 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2421 __func__, clp->cl_hostname);
2423 case -NFS4ERR_DELAY:
2425 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2428 return nfs4_recovery_handle_error(clp, ret);
2432 #else /* CONFIG_NFS_V4_1 */
2433 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2435 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2439 #endif /* CONFIG_NFS_V4_1 */
2441 static void nfs4_state_manager(struct nfs_client *clp)
2444 const char *section = "", *section_sep = "";
2446 /* Ensure exclusive access to NFSv4 state */
2448 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2449 section = "purge state";
2450 status = nfs4_purge_lease(clp);
2456 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2457 section = "lease expired";
2458 /* We're going to have to re-establish a clientid */
2459 status = nfs4_reclaim_lease(clp);
2465 /* Initialize or reset the session */
2466 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2467 section = "reset session";
2468 status = nfs4_reset_session(clp);
2469 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2475 /* Send BIND_CONN_TO_SESSION */
2476 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2478 section = "bind conn to session";
2479 status = nfs4_bind_conn_to_session(clp);
2485 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2486 section = "check lease";
2487 status = nfs4_check_lease(clp);
2493 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2494 section = "migration";
2495 status = nfs4_handle_migration(clp);
2500 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2501 section = "lease moved";
2502 status = nfs4_handle_lease_moved(clp);
2507 /* First recover reboot state... */
2508 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2509 section = "reclaim reboot";
2510 status = nfs4_do_reclaim(clp,
2511 clp->cl_mvops->reboot_recovery_ops);
2512 if (status == -EAGAIN)
2516 nfs4_state_end_reclaim_reboot(clp);
2520 /* Detect expired delegations... */
2521 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2522 section = "detect expired delegations";
2523 nfs_reap_expired_delegations(clp);
2527 /* Now recover expired state... */
2528 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2529 section = "reclaim nograce";
2530 status = nfs4_do_reclaim(clp,
2531 clp->cl_mvops->nograce_recovery_ops);
2532 if (status == -EAGAIN)
2538 nfs4_end_drain_session(clp);
2539 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2540 nfs_client_return_marked_delegations(clp);
2544 nfs4_clear_state_manager_bit(clp);
2545 /* Did we race with an attempt to give us more work? */
2546 if (clp->cl_state == 0)
2548 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2550 } while (atomic_read(&clp->cl_count) > 1);
2553 if (strlen(section))
2555 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2556 " with error %d\n", section_sep, section,
2557 clp->cl_hostname, -status);
2559 nfs4_end_drain_session(clp);
2560 nfs4_clear_state_manager_bit(clp);
2563 static int nfs4_run_state_manager(void *ptr)
2565 struct nfs_client *clp = ptr;
2567 allow_signal(SIGKILL);
2568 nfs4_state_manager(clp);
2569 nfs_put_client(clp);
2570 module_put_and_exit(0);