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>
52 #include <linux/sched/mm.h>
54 #include <linux/sunrpc/clnt.h>
58 #include "delegation.h"
60 #include "nfs4idmap.h"
61 #include "nfs4session.h"
64 #include "nfs4trace.h"
66 #define NFSDBG_FACILITY NFSDBG_STATE
68 #define OPENOWNER_POOL_SIZE 8
70 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp);
72 const nfs4_stateid zero_stateid = {
74 .type = NFS4_SPECIAL_STATEID_TYPE,
76 const nfs4_stateid invalid_stateid = {
78 /* Funky initialiser keeps older gcc versions happy */
79 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
81 .type = NFS4_INVALID_STATEID_TYPE,
84 const nfs4_stateid current_stateid = {
86 /* Funky initialiser keeps older gcc versions happy */
87 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
89 .type = NFS4_SPECIAL_STATEID_TYPE,
92 static DEFINE_MUTEX(nfs_clid_init_mutex);
94 static int nfs4_setup_state_renewal(struct nfs_client *clp)
97 struct nfs_fsinfo fsinfo;
99 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
100 nfs4_schedule_state_renewal(clp);
104 status = nfs4_proc_get_lease_time(clp, &fsinfo);
106 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ);
107 nfs4_schedule_state_renewal(clp);
113 int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
115 struct nfs4_setclientid_res clid = {
116 .clientid = clp->cl_clientid,
117 .confirm = clp->cl_confirm,
121 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
123 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
125 port = nn->nfs_callback_tcpport;
126 if (clp->cl_addr.ss_family == AF_INET6)
127 port = nn->nfs_callback_tcpport6;
129 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
132 clp->cl_clientid = clid.clientid;
133 clp->cl_confirm = clid.confirm;
134 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
136 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
139 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
140 nfs4_setup_state_renewal(clp);
146 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
148 * @clp: nfs_client under test
149 * @result: OUT: found nfs_client, or clp
150 * @cred: credential to use for trunking test
152 * Returns zero, a negative errno, or a negative NFS4ERR status.
153 * If zero is returned, an nfs_client pointer is planted in
156 * Note: The returned client may not yet be marked ready.
158 int nfs40_discover_server_trunking(struct nfs_client *clp,
159 struct nfs_client **result,
160 const struct cred *cred)
162 struct nfs4_setclientid_res clid = {
163 .clientid = clp->cl_clientid,
164 .confirm = clp->cl_confirm,
166 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
170 port = nn->nfs_callback_tcpport;
171 if (clp->cl_addr.ss_family == AF_INET6)
172 port = nn->nfs_callback_tcpport6;
174 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
177 clp->cl_clientid = clid.clientid;
178 clp->cl_confirm = clid.confirm;
180 status = nfs40_walk_client_list(clp, result, cred);
182 /* Sustain the lease, even if it's empty. If the clientid4
183 * goes stale it's of no use for trunking discovery. */
184 nfs4_schedule_state_renewal(*result);
186 /* If the client state need to recover, do it. */
188 nfs4_schedule_state_manager(clp);
194 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
196 return get_cred(rpc_machine_cred());
199 static void nfs4_root_machine_cred(struct nfs_client *clp)
202 /* Force root creds instead of machine */
203 clp->cl_principal = NULL;
204 clp->cl_rpcclient->cl_principal = NULL;
207 static const struct cred *
208 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
210 const struct cred *cred = NULL;
211 struct nfs4_state_owner *sp;
214 for (pos = rb_first(&server->state_owners);
216 pos = rb_next(pos)) {
217 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
218 if (list_empty(&sp->so_states))
220 cred = get_cred(sp->so_cred);
227 * nfs4_get_renew_cred - Acquire credential for a renew operation
228 * @clp: client state handle
230 * Returns an rpc_cred with reference count bumped, or NULL.
231 * Caller must hold clp->cl_lock.
233 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
235 const struct cred *cred = NULL;
236 struct nfs_server *server;
238 /* Use machine credentials if available */
239 cred = nfs4_get_machine_cred(clp);
243 spin_lock(&clp->cl_lock);
245 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
246 cred = nfs4_get_renew_cred_server_locked(server);
251 spin_unlock(&clp->cl_lock);
257 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
259 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
260 spin_lock(&tbl->slot_tbl_lock);
261 nfs41_wake_slot_table(tbl);
262 spin_unlock(&tbl->slot_tbl_lock);
266 static void nfs4_end_drain_session(struct nfs_client *clp)
268 struct nfs4_session *ses = clp->cl_session;
270 if (clp->cl_slot_tbl) {
271 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
276 nfs4_end_drain_slot_table(&ses->bc_slot_table);
277 nfs4_end_drain_slot_table(&ses->fc_slot_table);
281 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
283 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
284 spin_lock(&tbl->slot_tbl_lock);
285 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
286 reinit_completion(&tbl->complete);
287 spin_unlock(&tbl->slot_tbl_lock);
288 return wait_for_completion_interruptible(&tbl->complete);
290 spin_unlock(&tbl->slot_tbl_lock);
294 static int nfs4_begin_drain_session(struct nfs_client *clp)
296 struct nfs4_session *ses = clp->cl_session;
299 if (clp->cl_slot_tbl)
300 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
303 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
307 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
310 #if defined(CONFIG_NFS_V4_1)
312 static void nfs41_finish_session_reset(struct nfs_client *clp)
314 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
315 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
316 /* create_session negotiated new slot table */
317 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
318 nfs4_setup_state_renewal(clp);
321 int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
325 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
327 status = nfs4_proc_exchange_id(clp, cred);
330 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
332 status = nfs4_proc_create_session(clp, cred);
335 if (!(clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R))
336 nfs4_state_start_reclaim_reboot(clp);
337 nfs41_finish_session_reset(clp);
338 nfs_mark_client_ready(clp, NFS_CS_READY);
344 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
346 * @clp: nfs_client under test
347 * @result: OUT: found nfs_client, or clp
348 * @cred: credential to use for trunking test
350 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
351 * If NFS4_OK is returned, an nfs_client pointer is planted in
354 * Note: The returned client may not yet be marked ready.
356 int nfs41_discover_server_trunking(struct nfs_client *clp,
357 struct nfs_client **result,
358 const struct cred *cred)
362 status = nfs4_proc_exchange_id(clp, cred);
363 if (status != NFS4_OK)
366 status = nfs41_walk_client_list(clp, result, cred);
373 * Purge state if the client id was established in a prior
374 * instance and the client id could not have arrived on the
375 * server via Transparent State Migration.
377 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
378 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
379 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
381 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
383 nfs4_schedule_state_manager(clp);
384 status = nfs_wait_client_init_complete(clp);
390 #endif /* CONFIG_NFS_V4_1 */
393 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
394 * @clp: client state handle
396 * Returns a cred with reference count bumped, or NULL.
398 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
400 const struct cred *cred;
402 cred = nfs4_get_machine_cred(clp);
406 static struct nfs4_state_owner *
407 nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
409 struct rb_node **p = &server->state_owners.rb_node,
411 struct nfs4_state_owner *sp;
416 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
417 cmp = cred_fscmp(cred, sp->so_cred);
420 p = &parent->rb_left;
422 p = &parent->rb_right;
424 if (!list_empty(&sp->so_lru))
425 list_del_init(&sp->so_lru);
426 atomic_inc(&sp->so_count);
433 static struct nfs4_state_owner *
434 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
436 struct nfs_server *server = new->so_server;
437 struct rb_node **p = &server->state_owners.rb_node,
439 struct nfs4_state_owner *sp;
444 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
445 cmp = cred_fscmp(new->so_cred, sp->so_cred);
448 p = &parent->rb_left;
450 p = &parent->rb_right;
452 if (!list_empty(&sp->so_lru))
453 list_del_init(&sp->so_lru);
454 atomic_inc(&sp->so_count);
458 rb_link_node(&new->so_server_node, parent, p);
459 rb_insert_color(&new->so_server_node, &server->state_owners);
464 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
466 struct nfs_server *server = sp->so_server;
468 if (!RB_EMPTY_NODE(&sp->so_server_node))
469 rb_erase(&sp->so_server_node, &server->state_owners);
473 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
475 sc->create_time = ktime_get();
478 spin_lock_init(&sc->lock);
479 INIT_LIST_HEAD(&sc->list);
480 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
484 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
486 rpc_destroy_wait_queue(&sc->wait);
490 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
491 * create a new state_owner.
494 static struct nfs4_state_owner *
495 nfs4_alloc_state_owner(struct nfs_server *server,
496 const struct cred *cred,
499 struct nfs4_state_owner *sp;
501 sp = kzalloc(sizeof(*sp), gfp_flags);
504 sp->so_seqid.owner_id = ida_alloc(&server->openowner_id, gfp_flags);
505 if (sp->so_seqid.owner_id < 0) {
509 sp->so_server = server;
510 sp->so_cred = get_cred(cred);
511 spin_lock_init(&sp->so_lock);
512 INIT_LIST_HEAD(&sp->so_states);
513 nfs4_init_seqid_counter(&sp->so_seqid);
514 atomic_set(&sp->so_count, 1);
515 INIT_LIST_HEAD(&sp->so_lru);
516 seqcount_spinlock_init(&sp->so_reclaim_seqcount, &sp->so_lock);
517 mutex_init(&sp->so_delegreturn_mutex);
522 nfs4_reset_state_owner(struct nfs4_state_owner *sp)
524 /* This state_owner is no longer usable, but must
525 * remain in place so that state recovery can find it
526 * and the opens associated with it.
527 * It may also be used for new 'open' request to
528 * return a delegation to the server.
529 * So update the 'create_time' so that it looks like
530 * a new state_owner. This will cause the server to
531 * request an OPEN_CONFIRM to start a new sequence.
533 sp->so_seqid.create_time = ktime_get();
536 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
538 nfs4_destroy_seqid_counter(&sp->so_seqid);
539 put_cred(sp->so_cred);
540 ida_free(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
544 static void nfs4_gc_state_owners(struct nfs_server *server)
546 struct nfs_client *clp = server->nfs_client;
547 struct nfs4_state_owner *sp, *tmp;
548 unsigned long time_min, time_max;
551 spin_lock(&clp->cl_lock);
553 time_min = (long)time_max - (long)clp->cl_lease_time;
554 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
555 /* NB: LRU is sorted so that oldest is at the head */
556 if (time_in_range(sp->so_expires, time_min, time_max))
558 list_move(&sp->so_lru, &doomed);
559 nfs4_remove_state_owner_locked(sp);
561 spin_unlock(&clp->cl_lock);
563 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
564 list_del(&sp->so_lru);
565 nfs4_free_state_owner(sp);
570 * nfs4_get_state_owner - Look up a state owner given a credential
571 * @server: nfs_server to search
572 * @cred: RPC credential to match
573 * @gfp_flags: allocation mode
575 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
577 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
578 const struct cred *cred,
581 struct nfs_client *clp = server->nfs_client;
582 struct nfs4_state_owner *sp, *new;
584 spin_lock(&clp->cl_lock);
585 sp = nfs4_find_state_owner_locked(server, cred);
586 spin_unlock(&clp->cl_lock);
589 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
592 spin_lock(&clp->cl_lock);
593 sp = nfs4_insert_state_owner_locked(new);
594 spin_unlock(&clp->cl_lock);
596 nfs4_free_state_owner(new);
598 nfs4_gc_state_owners(server);
603 * nfs4_put_state_owner - Release a nfs4_state_owner
604 * @sp: state owner data to release
606 * Note that we keep released state owners on an LRU
608 * This caches valid state owners so that they can be
609 * reused, to avoid the OPEN_CONFIRM on minor version 0.
610 * It also pins the uniquifier of dropped state owners for
611 * a while, to ensure that those state owner names are
614 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
616 struct nfs_server *server = sp->so_server;
617 struct nfs_client *clp = server->nfs_client;
619 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
622 sp->so_expires = jiffies;
623 list_add_tail(&sp->so_lru, &server->state_owners_lru);
624 spin_unlock(&clp->cl_lock);
628 * nfs4_purge_state_owners - Release all cached state owners
629 * @server: nfs_server with cached state owners to release
630 * @head: resulting list of state owners
632 * Called at umount time. Remaining state owners will be on
633 * the LRU with ref count of zero.
634 * Note that the state owners are not freed, but are added
635 * to the list @head, which can later be used as an argument
636 * to nfs4_free_state_owners.
638 void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
640 struct nfs_client *clp = server->nfs_client;
641 struct nfs4_state_owner *sp, *tmp;
643 spin_lock(&clp->cl_lock);
644 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
645 list_move(&sp->so_lru, head);
646 nfs4_remove_state_owner_locked(sp);
648 spin_unlock(&clp->cl_lock);
652 * nfs4_free_state_owners - Release all cached state owners
653 * @head: resulting list of state owners
655 * Frees a list of state owners that was generated by
656 * nfs4_purge_state_owners
658 void nfs4_free_state_owners(struct list_head *head)
660 struct nfs4_state_owner *sp, *tmp;
662 list_for_each_entry_safe(sp, tmp, head, so_lru) {
663 list_del(&sp->so_lru);
664 nfs4_free_state_owner(sp);
668 static struct nfs4_state *
669 nfs4_alloc_open_state(void)
671 struct nfs4_state *state;
673 state = kzalloc(sizeof(*state), GFP_KERNEL_ACCOUNT);
676 refcount_set(&state->count, 1);
677 INIT_LIST_HEAD(&state->lock_states);
678 spin_lock_init(&state->state_lock);
679 seqlock_init(&state->seqlock);
680 init_waitqueue_head(&state->waitq);
685 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
687 if (state->state == fmode)
689 /* NB! List reordering - see the reclaim code for why. */
690 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
691 if (fmode & FMODE_WRITE)
692 list_move(&state->open_states, &state->owner->so_states);
694 list_move_tail(&state->open_states, &state->owner->so_states);
696 state->state = fmode;
699 static struct nfs4_state *
700 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
702 struct nfs_inode *nfsi = NFS_I(inode);
703 struct nfs4_state *state;
705 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
706 if (state->owner != owner)
708 if (!nfs4_valid_open_stateid(state))
710 if (refcount_inc_not_zero(&state->count))
717 nfs4_free_open_state(struct nfs4_state *state)
719 kfree_rcu(state, rcu_head);
723 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
725 struct nfs4_state *state, *new;
726 struct nfs_inode *nfsi = NFS_I(inode);
729 state = __nfs4_find_state_byowner(inode, owner);
733 new = nfs4_alloc_open_state();
734 spin_lock(&owner->so_lock);
735 spin_lock(&inode->i_lock);
736 state = __nfs4_find_state_byowner(inode, owner);
737 if (state == NULL && new != NULL) {
739 state->owner = owner;
740 atomic_inc(&owner->so_count);
742 state->inode = inode;
743 list_add_rcu(&state->inode_states, &nfsi->open_states);
744 spin_unlock(&inode->i_lock);
745 /* Note: The reclaim code dictates that we add stateless
746 * and read-only stateids to the end of the list */
747 list_add_tail(&state->open_states, &owner->so_states);
748 spin_unlock(&owner->so_lock);
750 spin_unlock(&inode->i_lock);
751 spin_unlock(&owner->so_lock);
753 nfs4_free_open_state(new);
759 void nfs4_put_open_state(struct nfs4_state *state)
761 struct inode *inode = state->inode;
762 struct nfs4_state_owner *owner = state->owner;
764 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
766 spin_lock(&inode->i_lock);
767 list_del_rcu(&state->inode_states);
768 list_del(&state->open_states);
769 spin_unlock(&inode->i_lock);
770 spin_unlock(&owner->so_lock);
771 nfs4_inode_return_delegation_on_close(inode);
773 nfs4_free_open_state(state);
774 nfs4_put_state_owner(owner);
778 * Close the current file.
780 static void __nfs4_close(struct nfs4_state *state,
781 fmode_t fmode, gfp_t gfp_mask, int wait)
783 struct nfs4_state_owner *owner = state->owner;
787 atomic_inc(&owner->so_count);
788 /* Protect against nfs4_find_state() */
789 spin_lock(&owner->so_lock);
790 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
797 case FMODE_READ|FMODE_WRITE:
800 newstate = FMODE_READ|FMODE_WRITE;
801 if (state->n_rdwr == 0) {
802 if (state->n_rdonly == 0) {
803 newstate &= ~FMODE_READ;
804 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
805 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
807 if (state->n_wronly == 0) {
808 newstate &= ~FMODE_WRITE;
809 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
810 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
813 clear_bit(NFS_DELEGATED_STATE, &state->flags);
815 nfs4_state_set_mode_locked(state, newstate);
816 spin_unlock(&owner->so_lock);
819 nfs4_put_open_state(state);
820 nfs4_put_state_owner(owner);
822 nfs4_do_close(state, gfp_mask, wait);
825 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
827 __nfs4_close(state, fmode, GFP_KERNEL, 0);
830 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
832 __nfs4_close(state, fmode, GFP_KERNEL, 1);
836 * Search the state->lock_states for an existing lock_owner
837 * that is compatible with either of the given owners.
838 * If the second is non-zero, then the first refers to a Posix-lock
839 * owner (current->files) and the second refers to a flock/OFD
840 * owner (struct file*). In that case, prefer a match for the first
842 * If both sorts of locks are held on the one file we cannot know
843 * which stateid was intended to be used, so a "correct" choice cannot
844 * be made. Failing that, a "consistent" choice is preferable. The
845 * consistent choice we make is to prefer the first owner, that of a
848 static struct nfs4_lock_state *
849 __nfs4_find_lock_state(struct nfs4_state *state,
850 fl_owner_t fl_owner, fl_owner_t fl_owner2)
852 struct nfs4_lock_state *pos, *ret = NULL;
853 list_for_each_entry(pos, &state->lock_states, ls_locks) {
854 if (pos->ls_owner == fl_owner) {
858 if (pos->ls_owner == fl_owner2)
862 refcount_inc(&ret->ls_count);
867 * Return a compatible lock_state. If no initialized lock_state structure
868 * exists, return an uninitialized one.
871 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
873 struct nfs4_lock_state *lsp;
874 struct nfs_server *server = state->owner->so_server;
876 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL_ACCOUNT);
879 nfs4_init_seqid_counter(&lsp->ls_seqid);
880 refcount_set(&lsp->ls_count, 1);
881 lsp->ls_state = state;
882 lsp->ls_owner = fl_owner;
883 lsp->ls_seqid.owner_id = ida_alloc(&server->lockowner_id, GFP_KERNEL_ACCOUNT);
884 if (lsp->ls_seqid.owner_id < 0)
886 INIT_LIST_HEAD(&lsp->ls_locks);
893 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
895 ida_free(&server->lockowner_id, lsp->ls_seqid.owner_id);
896 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
901 * Return a compatible lock_state. If no initialized lock_state structure
902 * exists, return an uninitialized one.
905 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
907 struct nfs4_lock_state *lsp, *new = NULL;
910 spin_lock(&state->state_lock);
911 lsp = __nfs4_find_lock_state(state, owner, NULL);
915 list_add(&new->ls_locks, &state->lock_states);
916 set_bit(LK_STATE_IN_USE, &state->flags);
921 spin_unlock(&state->state_lock);
922 new = nfs4_alloc_lock_state(state, owner);
926 spin_unlock(&state->state_lock);
928 nfs4_free_lock_state(state->owner->so_server, new);
933 * Release reference to lock_state, and free it if we see that
934 * it is no longer in use
936 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
938 struct nfs_server *server;
939 struct nfs4_state *state;
943 state = lsp->ls_state;
944 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
946 list_del(&lsp->ls_locks);
947 if (list_empty(&state->lock_states))
948 clear_bit(LK_STATE_IN_USE, &state->flags);
949 spin_unlock(&state->state_lock);
950 server = state->owner->so_server;
951 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
952 struct nfs_client *clp = server->nfs_client;
954 clp->cl_mvops->free_lock_state(server, lsp);
956 nfs4_free_lock_state(server, lsp);
959 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
961 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
963 dst->fl_u.nfs4_fl.owner = lsp;
964 refcount_inc(&lsp->ls_count);
967 static void nfs4_fl_release_lock(struct file_lock *fl)
969 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
972 static const struct file_lock_operations nfs4_fl_lock_ops = {
973 .fl_copy_lock = nfs4_fl_copy_lock,
974 .fl_release_private = nfs4_fl_release_lock,
977 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
979 struct nfs4_lock_state *lsp;
981 if (fl->fl_ops != NULL)
983 lsp = nfs4_get_lock_state(state, fl->fl_owner);
986 fl->fl_u.nfs4_fl.owner = lsp;
987 fl->fl_ops = &nfs4_fl_lock_ops;
991 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
992 struct nfs4_state *state,
993 const struct nfs_lock_context *l_ctx)
995 struct nfs4_lock_state *lsp;
996 fl_owner_t fl_owner, fl_flock_owner;
1002 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
1005 fl_owner = l_ctx->lockowner;
1006 fl_flock_owner = l_ctx->open_context->flock_owner;
1008 spin_lock(&state->state_lock);
1009 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
1010 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
1012 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1013 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1016 spin_unlock(&state->state_lock);
1017 nfs4_put_lock_state(lsp);
1022 bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1025 const nfs4_stateid *src;
1030 src = &zero_stateid;
1031 seq = read_seqbegin(&state->seqlock);
1032 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1033 src = &state->open_stateid;
1036 nfs4_stateid_copy(dst, src);
1037 } while (read_seqretry(&state->seqlock, seq));
1042 * Byte-range lock aware utility to initialize the stateid of read/write
1045 int nfs4_select_rw_stateid(struct nfs4_state *state,
1046 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1047 nfs4_stateid *dst, const struct cred **cred)
1051 if (!nfs4_valid_open_stateid(state))
1055 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1057 /* A lost lock - don't even consider delegations */
1059 /* returns true if delegation stateid found and copied */
1060 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1065 /* nfs4_copy_delegation_stateid() didn't over-write
1066 * dst, so it still has the lock stateid which we now
1070 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1072 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1077 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1079 struct nfs_seqid *new;
1081 new = kmalloc(sizeof(*new), gfp_mask);
1083 return ERR_PTR(-ENOMEM);
1084 new->sequence = counter;
1085 INIT_LIST_HEAD(&new->list);
1090 void nfs_release_seqid(struct nfs_seqid *seqid)
1092 struct nfs_seqid_counter *sequence;
1094 if (seqid == NULL || list_empty(&seqid->list))
1096 sequence = seqid->sequence;
1097 spin_lock(&sequence->lock);
1098 list_del_init(&seqid->list);
1099 if (!list_empty(&sequence->list)) {
1100 struct nfs_seqid *next;
1102 next = list_first_entry(&sequence->list,
1103 struct nfs_seqid, list);
1104 rpc_wake_up_queued_task(&sequence->wait, next->task);
1106 spin_unlock(&sequence->lock);
1109 void nfs_free_seqid(struct nfs_seqid *seqid)
1111 nfs_release_seqid(seqid);
1116 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1117 * failed with a seqid incrementing error -
1118 * see comments nfs4.h:seqid_mutating_error()
1120 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1125 case -NFS4ERR_BAD_SEQID:
1126 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1128 pr_warn_ratelimited("NFS: v4 server returned a bad"
1129 " sequence-id error on an"
1130 " unconfirmed sequence %p!\n",
1133 case -NFS4ERR_STALE_CLIENTID:
1134 case -NFS4ERR_STALE_STATEID:
1135 case -NFS4ERR_BAD_STATEID:
1136 case -NFS4ERR_BADXDR:
1137 case -NFS4ERR_RESOURCE:
1138 case -NFS4ERR_NOFILEHANDLE:
1139 case -NFS4ERR_MOVED:
1140 /* Non-seqid mutating errors */
1144 * Note: no locking needed as we are guaranteed to be first
1145 * on the sequence list
1147 seqid->sequence->counter++;
1150 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1152 struct nfs4_state_owner *sp;
1157 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1158 if (status == -NFS4ERR_BAD_SEQID)
1159 nfs4_reset_state_owner(sp);
1160 if (!nfs4_has_session(sp->so_server->nfs_client))
1161 nfs_increment_seqid(status, seqid);
1165 * Increment the seqid if the LOCK/LOCKU succeeded, or
1166 * failed with a seqid incrementing error -
1167 * see comments nfs4.h:seqid_mutating_error()
1169 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1172 nfs_increment_seqid(status, seqid);
1175 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1177 struct nfs_seqid_counter *sequence;
1182 sequence = seqid->sequence;
1183 spin_lock(&sequence->lock);
1185 if (list_empty(&seqid->list))
1186 list_add_tail(&seqid->list, &sequence->list);
1187 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1189 rpc_sleep_on(&sequence->wait, task, NULL);
1192 spin_unlock(&sequence->lock);
1197 static int nfs4_run_state_manager(void *);
1199 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1201 clear_and_wake_up_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1202 rpc_wake_up(&clp->cl_rpcwaitq);
1206 * Schedule the nfs_client asynchronous state management routine
1208 void nfs4_schedule_state_manager(struct nfs_client *clp)
1210 struct task_struct *task;
1211 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1212 struct rpc_clnt *cl = clp->cl_rpcclient;
1214 while (cl != cl->cl_parent)
1217 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1218 if (test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) != 0) {
1219 wake_up_var(&clp->cl_state);
1222 set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1223 __module_get(THIS_MODULE);
1224 refcount_inc(&clp->cl_count);
1226 /* The rcu_read_lock() is not strictly necessary, as the state
1227 * manager is the only thread that ever changes the rpc_xprt
1228 * after it's initialized. At this point, we're single threaded. */
1230 snprintf(buf, sizeof(buf), "%s-manager",
1231 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1233 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1235 printk(KERN_ERR "%s: kthread_run: %ld\n",
1236 __func__, PTR_ERR(task));
1237 if (!nfs_client_init_is_complete(clp))
1238 nfs_mark_client_ready(clp, PTR_ERR(task));
1239 nfs4_clear_state_manager_bit(clp);
1240 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
1241 nfs_put_client(clp);
1242 module_put(THIS_MODULE);
1247 * Schedule a lease recovery attempt
1249 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1253 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1254 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1255 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1257 nfs4_schedule_state_manager(clp);
1259 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1262 * nfs4_schedule_migration_recovery - trigger migration recovery
1264 * @server: FSID that is migrating
1266 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1267 * value is returned.
1269 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1271 struct nfs_client *clp = server->nfs_client;
1273 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1274 pr_err("NFS: volatile file handles not supported (server %s)\n",
1279 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1282 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1284 (unsigned long long)server->fsid.major,
1285 (unsigned long long)server->fsid.minor,
1288 set_bit(NFS_MIG_IN_TRANSITION,
1289 &((struct nfs_server *)server)->mig_status);
1290 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1292 nfs4_schedule_state_manager(clp);
1295 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1298 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1300 * @clp: server to check for moved leases
1303 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1305 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1306 __func__, clp->cl_clientid, clp->cl_hostname);
1308 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1309 nfs4_schedule_state_manager(clp);
1311 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1313 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1319 refcount_inc(&clp->cl_count);
1320 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1321 nfs_wait_bit_killable,
1322 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1325 if (clp->cl_cons_state < 0)
1326 res = clp->cl_cons_state;
1328 nfs_put_client(clp);
1332 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1337 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1338 ret = nfs4_wait_clnt_recover(clp);
1341 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1342 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1344 nfs4_schedule_state_manager(clp);
1351 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1352 * @clp: client to process
1354 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1355 * resend of the SETCLIENTID and hence re-establish the
1356 * callback channel. Then return all existing delegations.
1358 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1360 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1361 nfs_expire_all_delegations(clp);
1362 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1366 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1368 nfs40_handle_cb_pathdown(clp);
1369 nfs4_schedule_state_manager(clp);
1372 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1375 if (!nfs4_valid_open_stateid(state))
1377 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1378 /* Don't recover state that expired before the reboot */
1379 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1380 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1383 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1384 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1388 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1390 if (!nfs4_valid_open_stateid(state))
1392 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1393 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1394 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1395 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1399 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1401 struct nfs_client *clp = server->nfs_client;
1403 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1405 nfs_inode_find_delegation_state_and_recover(state->inode,
1407 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1409 nfs4_schedule_state_manager(clp);
1412 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1414 static struct nfs4_lock_state *
1415 nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1416 const nfs4_stateid *stateid)
1418 struct nfs4_lock_state *pos;
1420 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1421 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1423 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
1429 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1430 const nfs4_stateid *stateid)
1434 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1435 spin_lock(&state->state_lock);
1436 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1438 spin_unlock(&state->state_lock);
1443 void nfs_inode_find_state_and_recover(struct inode *inode,
1444 const nfs4_stateid *stateid)
1446 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1447 struct nfs_inode *nfsi = NFS_I(inode);
1448 struct nfs_open_context *ctx;
1449 struct nfs4_state *state;
1453 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1457 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
1458 nfs4_state_mark_reclaim_nograce(clp, state)) {
1462 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1463 nfs4_stateid_match_or_older(&state->open_stateid, stateid) &&
1464 nfs4_state_mark_reclaim_nograce(clp, state)) {
1468 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1469 nfs4_state_mark_reclaim_nograce(clp, state))
1474 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1476 nfs4_schedule_state_manager(clp);
1479 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1481 struct inode *inode = state->inode;
1482 struct nfs_inode *nfsi = NFS_I(inode);
1483 struct nfs_open_context *ctx;
1486 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1487 if (ctx->state != state)
1489 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1490 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1491 "error = %d\n", ctx->dentry, err);
1496 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1498 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1499 nfs4_state_mark_open_context_bad(state, error);
1503 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1505 struct inode *inode = state->inode;
1506 struct nfs_inode *nfsi = NFS_I(inode);
1507 struct file_lock *fl;
1508 struct nfs4_lock_state *lsp;
1510 struct file_lock_context *flctx = inode->i_flctx;
1511 struct list_head *list;
1516 list = &flctx->flc_posix;
1518 /* Guard against delegation returns and new lock/unlock calls */
1519 down_write(&nfsi->rwsem);
1520 spin_lock(&flctx->flc_lock);
1522 list_for_each_entry(fl, list, fl_list) {
1523 if (nfs_file_open_context(fl->fl_file)->state != state)
1525 spin_unlock(&flctx->flc_lock);
1526 status = ops->recover_lock(state, fl);
1532 case -NFS4ERR_ADMIN_REVOKED:
1533 case -NFS4ERR_STALE_STATEID:
1534 case -NFS4ERR_BAD_STATEID:
1535 case -NFS4ERR_EXPIRED:
1536 case -NFS4ERR_NO_GRACE:
1537 case -NFS4ERR_STALE_CLIENTID:
1538 case -NFS4ERR_BADSESSION:
1539 case -NFS4ERR_BADSLOT:
1540 case -NFS4ERR_BAD_HIGH_SLOT:
1541 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1544 pr_err("NFS: %s: unhandled error %d\n",
1548 case -NFS4ERR_DENIED:
1549 case -NFS4ERR_RECLAIM_BAD:
1550 case -NFS4ERR_RECLAIM_CONFLICT:
1551 lsp = fl->fl_u.nfs4_fl.owner;
1553 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1556 spin_lock(&flctx->flc_lock);
1558 if (list == &flctx->flc_posix) {
1559 list = &flctx->flc_flock;
1562 spin_unlock(&flctx->flc_lock);
1564 up_write(&nfsi->rwsem);
1568 #ifdef CONFIG_NFS_V4_2
1569 static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1571 struct nfs4_copy_state *copy;
1573 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1574 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1577 spin_lock(&sp->so_server->nfs_client->cl_lock);
1578 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1579 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1580 !nfs4_stateid_match_other(&state->stateid,
1581 ©->parent_dst_state->stateid)))
1584 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1586 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1587 complete(©->completion);
1590 list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) {
1591 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1592 !nfs4_stateid_match_other(&state->stateid,
1593 ©->parent_src_state->stateid)))
1596 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1598 complete(©->completion);
1600 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1602 #else /* !CONFIG_NFS_V4_2 */
1603 static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1604 struct nfs4_state *state)
1607 #endif /* CONFIG_NFS_V4_2 */
1609 static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1610 const struct nfs4_state_recovery_ops *ops,
1613 struct nfs4_lock_state *lock;
1616 status = ops->recover_open(sp, state);
1620 status = nfs4_reclaim_locks(state, ops);
1624 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1625 spin_lock(&state->state_lock);
1626 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1627 trace_nfs4_state_lock_reclaim(state, lock);
1628 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1631 spin_unlock(&state->state_lock);
1634 nfs42_complete_copies(sp, state);
1635 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1639 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp,
1640 const struct nfs4_state_recovery_ops *ops,
1643 struct nfs4_state *state;
1644 unsigned int loop = 0;
1646 #ifdef CONFIG_NFS_V4_2
1647 bool found_ssc_copy_state = false;
1648 #endif /* CONFIG_NFS_V4_2 */
1650 /* Note: we rely on the sp->so_states list being ordered
1651 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1653 * This is needed to ensure that the server won't give us any
1654 * read delegations that we have to return if, say, we are
1655 * recovering after a network partition or a reboot from a
1656 * server that doesn't support a grace period.
1658 spin_lock(&sp->so_lock);
1659 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1661 list_for_each_entry(state, &sp->so_states, open_states) {
1662 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1664 if (!nfs4_valid_open_stateid(state))
1666 if (state->state == 0)
1668 #ifdef CONFIG_NFS_V4_2
1669 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1670 nfs4_state_mark_recovery_failed(state, -EIO);
1671 found_ssc_copy_state = true;
1674 #endif /* CONFIG_NFS_V4_2 */
1675 refcount_inc(&state->count);
1676 spin_unlock(&sp->so_lock);
1677 status = __nfs4_reclaim_open_state(sp, state, ops, lost_locks);
1685 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1693 /* Open state on this file cannot be recovered */
1694 nfs4_state_mark_recovery_failed(state, status);
1699 set_bit(ops->state_flag_bit, &state->flags);
1703 case -NFS4ERR_ADMIN_REVOKED:
1704 case -NFS4ERR_STALE_STATEID:
1705 case -NFS4ERR_OLD_STATEID:
1706 case -NFS4ERR_BAD_STATEID:
1707 case -NFS4ERR_RECLAIM_BAD:
1708 case -NFS4ERR_RECLAIM_CONFLICT:
1709 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1711 case -NFS4ERR_EXPIRED:
1712 case -NFS4ERR_NO_GRACE:
1713 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1715 case -NFS4ERR_STALE_CLIENTID:
1716 case -NFS4ERR_BADSESSION:
1717 case -NFS4ERR_BADSLOT:
1718 case -NFS4ERR_BAD_HIGH_SLOT:
1719 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1723 nfs4_put_open_state(state);
1724 spin_lock(&sp->so_lock);
1727 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1728 spin_unlock(&sp->so_lock);
1729 #ifdef CONFIG_NFS_V4_2
1730 if (found_ssc_copy_state)
1732 #endif /* CONFIG_NFS_V4_2 */
1735 nfs4_put_open_state(state);
1736 spin_lock(&sp->so_lock);
1737 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1738 spin_unlock(&sp->so_lock);
1742 static void nfs4_clear_open_state(struct nfs4_state *state)
1744 struct nfs4_lock_state *lock;
1746 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1747 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1748 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1749 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1750 spin_lock(&state->state_lock);
1751 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1752 lock->ls_seqid.flags = 0;
1753 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1755 spin_unlock(&state->state_lock);
1758 static void nfs4_reset_seqids(struct nfs_server *server,
1759 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1761 struct nfs_client *clp = server->nfs_client;
1762 struct nfs4_state_owner *sp;
1763 struct rb_node *pos;
1764 struct nfs4_state *state;
1766 spin_lock(&clp->cl_lock);
1767 for (pos = rb_first(&server->state_owners);
1769 pos = rb_next(pos)) {
1770 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1771 sp->so_seqid.flags = 0;
1772 spin_lock(&sp->so_lock);
1773 list_for_each_entry(state, &sp->so_states, open_states) {
1774 if (mark_reclaim(clp, state))
1775 nfs4_clear_open_state(state);
1777 spin_unlock(&sp->so_lock);
1779 spin_unlock(&clp->cl_lock);
1782 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1783 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1785 struct nfs_server *server;
1788 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1789 nfs4_reset_seqids(server, mark_reclaim);
1793 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1795 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1796 /* Mark all delegations for reclaim */
1797 nfs_delegation_mark_reclaim(clp);
1798 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1801 static int nfs4_reclaim_complete(struct nfs_client *clp,
1802 const struct nfs4_state_recovery_ops *ops,
1803 const struct cred *cred)
1805 /* Notify the server we're done reclaiming our state */
1806 if (ops->reclaim_complete)
1807 return ops->reclaim_complete(clp, cred);
1811 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1813 struct nfs_client *clp = server->nfs_client;
1814 struct nfs4_state_owner *sp;
1815 struct rb_node *pos;
1816 struct nfs4_state *state;
1818 spin_lock(&clp->cl_lock);
1819 for (pos = rb_first(&server->state_owners);
1821 pos = rb_next(pos)) {
1822 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1823 spin_lock(&sp->so_lock);
1824 list_for_each_entry(state, &sp->so_states, open_states) {
1825 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1828 nfs4_state_mark_reclaim_nograce(clp, state);
1830 spin_unlock(&sp->so_lock);
1832 spin_unlock(&clp->cl_lock);
1835 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1837 struct nfs_server *server;
1839 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1843 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1844 nfs4_clear_reclaim_server(server);
1847 nfs_delegation_reap_unclaimed(clp);
1851 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1853 const struct nfs4_state_recovery_ops *ops;
1854 const struct cred *cred;
1857 if (!nfs4_state_clear_reclaim_reboot(clp))
1859 ops = clp->cl_mvops->reboot_recovery_ops;
1860 cred = nfs4_get_clid_cred(clp);
1861 err = nfs4_reclaim_complete(clp, ops, cred);
1863 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1864 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1867 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1869 nfs_mark_test_expired_all_delegations(clp);
1870 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1873 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1878 case -NFS4ERR_CB_PATH_DOWN:
1879 nfs40_handle_cb_pathdown(clp);
1881 case -NFS4ERR_NO_GRACE:
1882 nfs4_state_end_reclaim_reboot(clp);
1884 case -NFS4ERR_STALE_CLIENTID:
1885 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1886 nfs4_state_start_reclaim_reboot(clp);
1888 case -NFS4ERR_EXPIRED:
1889 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1890 nfs4_state_start_reclaim_nograce(clp);
1892 case -NFS4ERR_BADSESSION:
1893 case -NFS4ERR_BADSLOT:
1894 case -NFS4ERR_BAD_HIGH_SLOT:
1895 case -NFS4ERR_DEADSESSION:
1896 case -NFS4ERR_SEQ_FALSE_RETRY:
1897 case -NFS4ERR_SEQ_MISORDERED:
1898 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1899 /* Zero session reset errors */
1901 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1902 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1905 dprintk("%s: failed to handle error %d for server %s\n",
1906 __func__, error, clp->cl_hostname);
1909 dprintk("%s: handled error %d for server %s\n", __func__, error,
1914 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1916 struct nfs4_state_owner *sp;
1917 struct nfs_server *server;
1918 struct rb_node *pos;
1925 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1926 nfs4_purge_state_owners(server, &freeme);
1927 spin_lock(&clp->cl_lock);
1928 for (pos = rb_first(&server->state_owners);
1930 pos = rb_next(pos)) {
1932 struct nfs4_state_owner, so_server_node);
1933 if (!test_and_clear_bit(ops->owner_flag_bit,
1936 if (!atomic_inc_not_zero(&sp->so_count))
1938 spin_unlock(&clp->cl_lock);
1941 status = nfs4_reclaim_open_state(sp, ops, &lost_locks);
1944 pr_warn("NFS: %s: lost %d locks\n",
1945 clp->cl_hostname, lost_locks);
1946 set_bit(ops->owner_flag_bit, &sp->so_flags);
1947 nfs4_put_state_owner(sp);
1948 status = nfs4_recovery_handle_error(clp, status);
1949 return (status != 0) ? status : -EAGAIN;
1952 nfs4_put_state_owner(sp);
1955 spin_unlock(&clp->cl_lock);
1958 nfs4_free_state_owners(&freeme);
1960 pr_warn("NFS: %s: lost %d locks\n",
1961 clp->cl_hostname, lost_locks);
1965 static int nfs4_check_lease(struct nfs_client *clp)
1967 const struct cred *cred;
1968 const struct nfs4_state_maintenance_ops *ops =
1969 clp->cl_mvops->state_renewal_ops;
1972 /* Is the client already known to have an expired lease? */
1973 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1975 cred = ops->get_state_renewal_cred(clp);
1977 cred = nfs4_get_clid_cred(clp);
1982 status = ops->renew_lease(clp, cred);
1984 if (status == -ETIMEDOUT) {
1985 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1989 return nfs4_recovery_handle_error(clp, status);
1992 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1993 * and for recoverable errors on EXCHANGE_ID for v4.1
1995 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1998 case -NFS4ERR_SEQ_MISORDERED:
1999 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
2000 return -ESERVERFAULT;
2001 /* Lease confirmation error: retry after purging the lease */
2003 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2005 case -NFS4ERR_STALE_CLIENTID:
2006 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2007 nfs4_state_start_reclaim_reboot(clp);
2009 case -NFS4ERR_CLID_INUSE:
2010 pr_err("NFS: Server %s reports our clientid is in use\n",
2012 nfs_mark_client_ready(clp, -EPERM);
2013 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2016 case -NFS4ERR_DELAY:
2021 case -NFS4ERR_MINOR_VERS_MISMATCH:
2022 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2023 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
2024 dprintk("%s: exit with error %d for server %s\n",
2025 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2026 return -EPROTONOSUPPORT;
2028 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2029 nfs_mark_client_ready(clp, -EIO);
2031 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2032 * in nfs4_exchange_id */
2034 dprintk("%s: exit with error %d for server %s\n", __func__,
2035 status, clp->cl_hostname);
2038 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2039 dprintk("%s: handled error %d for server %s\n", __func__, status,
2044 static int nfs4_establish_lease(struct nfs_client *clp)
2046 const struct cred *cred;
2047 const struct nfs4_state_recovery_ops *ops =
2048 clp->cl_mvops->reboot_recovery_ops;
2051 status = nfs4_begin_drain_session(clp);
2054 cred = nfs4_get_clid_cred(clp);
2057 status = ops->establish_clid(clp, cred);
2061 pnfs_destroy_all_layouts(clp);
2066 * Returns zero or a negative errno. NFS4ERR values are converted
2067 * to local errno values.
2069 static int nfs4_reclaim_lease(struct nfs_client *clp)
2073 status = nfs4_establish_lease(clp);
2075 return nfs4_handle_reclaim_lease_error(clp, status);
2076 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2077 nfs4_state_start_reclaim_nograce(clp);
2078 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2079 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2080 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2081 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2085 static int nfs4_purge_lease(struct nfs_client *clp)
2089 status = nfs4_establish_lease(clp);
2091 return nfs4_handle_reclaim_lease_error(clp, status);
2092 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2093 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2094 nfs4_state_start_reclaim_nograce(clp);
2099 * Try remote migration of one FSID from a source server to a
2100 * destination server. The source server provides a list of
2101 * potential destinations.
2103 * Returns zero or a negative NFS4ERR status code.
2105 static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2107 struct nfs_client *clp = server->nfs_client;
2108 struct nfs4_fs_locations *locations = NULL;
2109 struct inode *inode;
2113 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2114 (unsigned long long)server->fsid.major,
2115 (unsigned long long)server->fsid.minor,
2119 page = alloc_page(GFP_KERNEL);
2120 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2121 if (page == NULL || locations == NULL) {
2122 dprintk("<-- %s: no memory\n", __func__);
2125 locations->fattr = nfs_alloc_fattr();
2126 if (locations->fattr == NULL) {
2127 dprintk("<-- %s: no memory\n", __func__);
2131 inode = d_inode(server->super->s_root);
2132 result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
2135 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2140 result = -NFS4ERR_NXIO;
2141 if (!locations->nlocations)
2144 if (!(locations->fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2145 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2150 status = nfs4_begin_drain_session(clp);
2156 status = nfs4_replace_transport(server, locations);
2158 dprintk("<-- %s: failed to replace transport: %d\n",
2164 dprintk("<-- %s: migration succeeded\n", __func__);
2169 if (locations != NULL)
2170 kfree(locations->fattr);
2173 pr_err("NFS: migration recovery failed (server %s)\n",
2175 set_bit(NFS_MIG_FAILED, &server->mig_status);
2181 * Returns zero or a negative NFS4ERR status code.
2183 static int nfs4_handle_migration(struct nfs_client *clp)
2185 const struct nfs4_state_maintenance_ops *ops =
2186 clp->cl_mvops->state_renewal_ops;
2187 struct nfs_server *server;
2188 const struct cred *cred;
2190 dprintk("%s: migration reported on \"%s\"\n", __func__,
2193 cred = ops->get_state_renewal_cred(clp);
2195 return -NFS4ERR_NOENT;
2200 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2203 if (server->mig_gen == clp->cl_mig_gen)
2205 server->mig_gen = clp->cl_mig_gen;
2207 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2208 &server->mig_status))
2212 status = nfs4_try_migration(server, cred);
2225 * Test each nfs_server on the clp's cl_superblocks list to see
2226 * if it's moved to another server. Stop when the server no longer
2227 * returns NFS4ERR_LEASE_MOVED.
2229 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2231 const struct nfs4_state_maintenance_ops *ops =
2232 clp->cl_mvops->state_renewal_ops;
2233 struct nfs_server *server;
2234 const struct cred *cred;
2236 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2239 cred = ops->get_state_renewal_cred(clp);
2241 return -NFS4ERR_NOENT;
2246 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2247 struct inode *inode;
2250 if (server->mig_gen == clp->cl_mig_gen)
2252 server->mig_gen = clp->cl_mig_gen;
2256 inode = d_inode(server->super->s_root);
2257 status = nfs4_proc_fsid_present(inode, cred);
2258 if (status != -NFS4ERR_MOVED)
2259 goto restart; /* wasn't this one */
2260 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2261 goto restart; /* there are more */
2272 * nfs4_discover_server_trunking - Detect server IP address trunking
2274 * @clp: nfs_client under test
2275 * @result: OUT: found nfs_client, or clp
2277 * Returns zero or a negative errno. If zero is returned,
2278 * an nfs_client pointer is planted in "result".
2280 * Note: since we are invoked in process context, and
2281 * not from inside the state manager, we cannot use
2282 * nfs4_handle_reclaim_lease_error().
2284 int nfs4_discover_server_trunking(struct nfs_client *clp,
2285 struct nfs_client **result)
2287 const struct nfs4_state_recovery_ops *ops =
2288 clp->cl_mvops->reboot_recovery_ops;
2289 struct rpc_clnt *clnt;
2290 const struct cred *cred;
2293 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2295 clnt = clp->cl_rpcclient;
2298 mutex_lock(&nfs_clid_init_mutex);
2301 cred = nfs4_get_clid_cred(clp);
2305 status = ops->detect_trunking(clp, result, cred);
2313 if (clnt->cl_softrtry)
2316 case -NFS4ERR_DELAY:
2320 case -NFS4ERR_STALE_CLIENTID:
2321 dprintk("NFS: %s after status %d, retrying\n",
2326 nfs4_root_machine_cred(clp);
2329 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2332 case -NFS4ERR_CLID_INUSE:
2333 case -NFS4ERR_WRONGSEC:
2334 /* No point in retrying if we already used RPC_AUTH_UNIX */
2335 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2339 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2341 status = PTR_ERR(clnt);
2344 /* Note: this is safe because we haven't yet marked the
2345 * client as ready, so we are the only user of
2348 clnt = xchg(&clp->cl_rpcclient, clnt);
2349 rpc_shutdown_client(clnt);
2350 clnt = clp->cl_rpcclient;
2353 case -NFS4ERR_MINOR_VERS_MISMATCH:
2354 status = -EPROTONOSUPPORT;
2358 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2359 * in nfs4_exchange_id */
2360 status = -EKEYEXPIRED;
2363 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2369 mutex_unlock(&nfs_clid_init_mutex);
2370 dprintk("NFS: %s: status = %d\n", __func__, status);
2374 #ifdef CONFIG_NFS_V4_1
2375 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2377 struct nfs_client *clp = session->clp;
2381 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2383 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2384 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2386 nfs4_schedule_state_manager(clp);
2388 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2390 void nfs41_notify_server(struct nfs_client *clp)
2392 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2393 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2394 nfs4_schedule_state_manager(clp);
2397 static void nfs4_reset_all_state(struct nfs_client *clp)
2399 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2400 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2401 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2402 nfs4_state_start_reclaim_nograce(clp);
2403 dprintk("%s: scheduling reset of all state for server %s!\n",
2404 __func__, clp->cl_hostname);
2405 nfs4_schedule_state_manager(clp);
2409 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2411 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2412 nfs4_state_start_reclaim_reboot(clp);
2413 dprintk("%s: server %s rebooted!\n", __func__,
2415 nfs4_schedule_state_manager(clp);
2419 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2421 nfs4_reset_all_state(clp);
2422 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2425 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2427 nfs4_state_start_reclaim_nograce(clp);
2428 nfs4_schedule_state_manager(clp);
2430 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2433 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2435 /* FIXME: For now, we destroy all layouts. */
2436 pnfs_destroy_all_layouts(clp);
2437 nfs_test_expired_all_delegations(clp);
2438 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2442 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2444 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2445 nfs4_schedule_state_manager(clp);
2447 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2451 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2453 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2454 &clp->cl_state) == 0)
2455 nfs4_schedule_state_manager(clp);
2458 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2464 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2465 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2467 * If we're called from the state manager thread, then assume we're
2468 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2469 * Those flags are expected to remain set until we're done
2470 * recovering (see RFC5661, section 18.46.3).
2475 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2476 nfs41_handle_server_reboot(clp);
2477 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2478 nfs41_handle_all_state_revoked(clp);
2479 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2480 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2481 nfs41_handle_some_state_revoked(clp);
2482 if (flags & SEQ4_STATUS_LEASE_MOVED)
2483 nfs4_schedule_lease_moved_recovery(clp);
2484 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2485 nfs41_handle_recallable_state_revoked(clp);
2487 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2488 nfs41_handle_backchannel_fault(clp);
2489 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2490 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2491 nfs41_handle_cb_path_down(clp);
2494 static int nfs4_reset_session(struct nfs_client *clp)
2496 const struct cred *cred;
2499 if (!nfs4_has_session(clp))
2501 status = nfs4_begin_drain_session(clp);
2504 cred = nfs4_get_clid_cred(clp);
2505 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2508 case -NFS4ERR_BADSESSION:
2509 case -NFS4ERR_DEADSESSION:
2511 case -NFS4ERR_BACK_CHAN_BUSY:
2512 case -NFS4ERR_DELAY:
2513 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2518 status = nfs4_recovery_handle_error(clp, status);
2522 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2523 status = nfs4_proc_create_session(clp, cred);
2525 dprintk("%s: session reset failed with status %d for server %s!\n",
2526 __func__, status, clp->cl_hostname);
2527 status = nfs4_handle_reclaim_lease_error(clp, status);
2530 nfs41_finish_session_reset(clp);
2531 dprintk("%s: session reset was successful for server %s!\n",
2532 __func__, clp->cl_hostname);
2538 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2540 const struct cred *cred;
2543 if (!nfs4_has_session(clp))
2545 ret = nfs4_begin_drain_session(clp);
2548 cred = nfs4_get_clid_cred(clp);
2549 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2551 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2554 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2555 __func__, clp->cl_hostname);
2557 case -NFS4ERR_DELAY:
2559 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2562 return nfs4_recovery_handle_error(clp, ret);
2567 static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2571 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2572 iomode += IOMODE_READ;
2573 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2574 iomode += IOMODE_RW;
2575 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2577 pnfs_layout_return_unused_byclid(clp, iomode);
2578 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2581 #else /* CONFIG_NFS_V4_1 */
2582 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2584 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2589 static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2592 #endif /* CONFIG_NFS_V4_1 */
2594 static void nfs4_state_manager(struct nfs_client *clp)
2596 unsigned int memflags;
2598 const char *section = "", *section_sep = "";
2601 * State recovery can deadlock if the direct reclaim code tries
2602 * start NFS writeback. So ensure memory allocations are all
2605 memflags = memalloc_nofs_save();
2607 /* Ensure exclusive access to NFSv4 state */
2609 trace_nfs4_state_mgr(clp);
2610 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2611 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2612 section = "purge state";
2613 status = nfs4_purge_lease(clp);
2619 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2620 section = "lease expired";
2621 /* We're going to have to re-establish a clientid */
2622 status = nfs4_reclaim_lease(clp);
2628 /* Initialize or reset the session */
2629 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2630 section = "reset session";
2631 status = nfs4_reset_session(clp);
2632 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2638 /* Send BIND_CONN_TO_SESSION */
2639 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2641 section = "bind conn to session";
2642 status = nfs4_bind_conn_to_session(clp);
2648 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2649 section = "check lease";
2650 status = nfs4_check_lease(clp);
2656 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2657 section = "migration";
2658 status = nfs4_handle_migration(clp);
2663 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2664 section = "lease moved";
2665 status = nfs4_handle_lease_moved(clp);
2670 /* First recover reboot state... */
2671 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2672 section = "reclaim reboot";
2673 status = nfs4_do_reclaim(clp,
2674 clp->cl_mvops->reboot_recovery_ops);
2675 if (status == -EAGAIN)
2679 nfs4_state_end_reclaim_reboot(clp);
2683 /* Detect expired delegations... */
2684 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2685 section = "detect expired delegations";
2686 nfs_reap_expired_delegations(clp);
2690 /* Now recover expired state... */
2691 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2692 section = "reclaim nograce";
2693 status = nfs4_do_reclaim(clp,
2694 clp->cl_mvops->nograce_recovery_ops);
2695 if (status == -EAGAIN)
2699 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2702 memalloc_nofs_restore(memflags);
2703 nfs4_end_drain_session(clp);
2704 nfs4_clear_state_manager_bit(clp);
2706 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
2707 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2708 nfs_client_return_marked_delegations(clp);
2709 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2711 nfs4_layoutreturn_any_run(clp);
2712 clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state);
2717 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2721 if (strlen(section))
2723 trace_nfs4_state_mgr_failed(clp, section, status);
2724 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2725 " with error %d\n", section_sep, section,
2726 clp->cl_hostname, -status);
2729 memalloc_nofs_restore(memflags);
2730 nfs4_end_drain_session(clp);
2731 nfs4_clear_state_manager_bit(clp);
2734 static int nfs4_run_state_manager(void *ptr)
2736 struct nfs_client *clp = ptr;
2737 struct rpc_clnt *cl = clp->cl_rpcclient;
2739 while (cl != cl->cl_parent)
2742 allow_signal(SIGKILL);
2744 set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
2745 nfs4_state_manager(clp);
2746 if (atomic_read(&cl->cl_swapper)) {
2747 wait_var_event_interruptible(&clp->cl_state,
2748 test_bit(NFS4CLNT_RUN_MANAGER,
2750 if (atomic_read(&cl->cl_swapper) &&
2751 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
2753 /* Either no longer a swapper, or were signalled */
2755 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2757 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2758 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2759 !test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state))
2762 nfs_put_client(clp);
2763 module_put_and_kthread_exit(0);