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_simple_get(&server->openowner_id, 0, 0,
506 if (sp->so_seqid.owner_id < 0) {
510 sp->so_server = server;
511 sp->so_cred = get_cred(cred);
512 spin_lock_init(&sp->so_lock);
513 INIT_LIST_HEAD(&sp->so_states);
514 nfs4_init_seqid_counter(&sp->so_seqid);
515 atomic_set(&sp->so_count, 1);
516 INIT_LIST_HEAD(&sp->so_lru);
517 seqcount_spinlock_init(&sp->so_reclaim_seqcount, &sp->so_lock);
518 mutex_init(&sp->so_delegreturn_mutex);
523 nfs4_reset_state_owner(struct nfs4_state_owner *sp)
525 /* This state_owner is no longer usable, but must
526 * remain in place so that state recovery can find it
527 * and the opens associated with it.
528 * It may also be used for new 'open' request to
529 * return a delegation to the server.
530 * So update the 'create_time' so that it looks like
531 * a new state_owner. This will cause the server to
532 * request an OPEN_CONFIRM to start a new sequence.
534 sp->so_seqid.create_time = ktime_get();
537 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
539 nfs4_destroy_seqid_counter(&sp->so_seqid);
540 put_cred(sp->so_cred);
541 ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
545 static void nfs4_gc_state_owners(struct nfs_server *server)
547 struct nfs_client *clp = server->nfs_client;
548 struct nfs4_state_owner *sp, *tmp;
549 unsigned long time_min, time_max;
552 spin_lock(&clp->cl_lock);
554 time_min = (long)time_max - (long)clp->cl_lease_time;
555 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
556 /* NB: LRU is sorted so that oldest is at the head */
557 if (time_in_range(sp->so_expires, time_min, time_max))
559 list_move(&sp->so_lru, &doomed);
560 nfs4_remove_state_owner_locked(sp);
562 spin_unlock(&clp->cl_lock);
564 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
565 list_del(&sp->so_lru);
566 nfs4_free_state_owner(sp);
571 * nfs4_get_state_owner - Look up a state owner given a credential
572 * @server: nfs_server to search
573 * @cred: RPC credential to match
574 * @gfp_flags: allocation mode
576 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
578 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
579 const struct cred *cred,
582 struct nfs_client *clp = server->nfs_client;
583 struct nfs4_state_owner *sp, *new;
585 spin_lock(&clp->cl_lock);
586 sp = nfs4_find_state_owner_locked(server, cred);
587 spin_unlock(&clp->cl_lock);
590 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
593 spin_lock(&clp->cl_lock);
594 sp = nfs4_insert_state_owner_locked(new);
595 spin_unlock(&clp->cl_lock);
597 nfs4_free_state_owner(new);
599 nfs4_gc_state_owners(server);
604 * nfs4_put_state_owner - Release a nfs4_state_owner
605 * @sp: state owner data to release
607 * Note that we keep released state owners on an LRU
609 * This caches valid state owners so that they can be
610 * reused, to avoid the OPEN_CONFIRM on minor version 0.
611 * It also pins the uniquifier of dropped state owners for
612 * a while, to ensure that those state owner names are
615 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
617 struct nfs_server *server = sp->so_server;
618 struct nfs_client *clp = server->nfs_client;
620 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
623 sp->so_expires = jiffies;
624 list_add_tail(&sp->so_lru, &server->state_owners_lru);
625 spin_unlock(&clp->cl_lock);
629 * nfs4_purge_state_owners - Release all cached state owners
630 * @server: nfs_server with cached state owners to release
631 * @head: resulting list of state owners
633 * Called at umount time. Remaining state owners will be on
634 * the LRU with ref count of zero.
635 * Note that the state owners are not freed, but are added
636 * to the list @head, which can later be used as an argument
637 * to nfs4_free_state_owners.
639 void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
641 struct nfs_client *clp = server->nfs_client;
642 struct nfs4_state_owner *sp, *tmp;
644 spin_lock(&clp->cl_lock);
645 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
646 list_move(&sp->so_lru, head);
647 nfs4_remove_state_owner_locked(sp);
649 spin_unlock(&clp->cl_lock);
653 * nfs4_free_state_owners - Release all cached state owners
654 * @head: resulting list of state owners
656 * Frees a list of state owners that was generated by
657 * nfs4_purge_state_owners
659 void nfs4_free_state_owners(struct list_head *head)
661 struct nfs4_state_owner *sp, *tmp;
663 list_for_each_entry_safe(sp, tmp, head, so_lru) {
664 list_del(&sp->so_lru);
665 nfs4_free_state_owner(sp);
669 static struct nfs4_state *
670 nfs4_alloc_open_state(void)
672 struct nfs4_state *state;
674 state = kzalloc(sizeof(*state), GFP_NOFS);
677 refcount_set(&state->count, 1);
678 INIT_LIST_HEAD(&state->lock_states);
679 spin_lock_init(&state->state_lock);
680 seqlock_init(&state->seqlock);
681 init_waitqueue_head(&state->waitq);
686 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
688 if (state->state == fmode)
690 /* NB! List reordering - see the reclaim code for why. */
691 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
692 if (fmode & FMODE_WRITE)
693 list_move(&state->open_states, &state->owner->so_states);
695 list_move_tail(&state->open_states, &state->owner->so_states);
697 state->state = fmode;
700 static struct nfs4_state *
701 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
703 struct nfs_inode *nfsi = NFS_I(inode);
704 struct nfs4_state *state;
706 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
707 if (state->owner != owner)
709 if (!nfs4_valid_open_stateid(state))
711 if (refcount_inc_not_zero(&state->count))
718 nfs4_free_open_state(struct nfs4_state *state)
720 kfree_rcu(state, rcu_head);
724 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
726 struct nfs4_state *state, *new;
727 struct nfs_inode *nfsi = NFS_I(inode);
730 state = __nfs4_find_state_byowner(inode, owner);
734 new = nfs4_alloc_open_state();
735 spin_lock(&owner->so_lock);
736 spin_lock(&inode->i_lock);
737 state = __nfs4_find_state_byowner(inode, owner);
738 if (state == NULL && new != NULL) {
740 state->owner = owner;
741 atomic_inc(&owner->so_count);
743 state->inode = inode;
744 list_add_rcu(&state->inode_states, &nfsi->open_states);
745 spin_unlock(&inode->i_lock);
746 /* Note: The reclaim code dictates that we add stateless
747 * and read-only stateids to the end of the list */
748 list_add_tail(&state->open_states, &owner->so_states);
749 spin_unlock(&owner->so_lock);
751 spin_unlock(&inode->i_lock);
752 spin_unlock(&owner->so_lock);
754 nfs4_free_open_state(new);
760 void nfs4_put_open_state(struct nfs4_state *state)
762 struct inode *inode = state->inode;
763 struct nfs4_state_owner *owner = state->owner;
765 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
767 spin_lock(&inode->i_lock);
768 list_del_rcu(&state->inode_states);
769 list_del(&state->open_states);
770 spin_unlock(&inode->i_lock);
771 spin_unlock(&owner->so_lock);
772 nfs4_inode_return_delegation_on_close(inode);
774 nfs4_free_open_state(state);
775 nfs4_put_state_owner(owner);
779 * Close the current file.
781 static void __nfs4_close(struct nfs4_state *state,
782 fmode_t fmode, gfp_t gfp_mask, int wait)
784 struct nfs4_state_owner *owner = state->owner;
788 atomic_inc(&owner->so_count);
789 /* Protect against nfs4_find_state() */
790 spin_lock(&owner->so_lock);
791 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
798 case FMODE_READ|FMODE_WRITE:
801 newstate = FMODE_READ|FMODE_WRITE;
802 if (state->n_rdwr == 0) {
803 if (state->n_rdonly == 0) {
804 newstate &= ~FMODE_READ;
805 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
806 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
808 if (state->n_wronly == 0) {
809 newstate &= ~FMODE_WRITE;
810 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
811 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
814 clear_bit(NFS_DELEGATED_STATE, &state->flags);
816 nfs4_state_set_mode_locked(state, newstate);
817 spin_unlock(&owner->so_lock);
820 nfs4_put_open_state(state);
821 nfs4_put_state_owner(owner);
823 nfs4_do_close(state, gfp_mask, wait);
826 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
828 __nfs4_close(state, fmode, GFP_KERNEL, 0);
831 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
833 __nfs4_close(state, fmode, GFP_KERNEL, 1);
837 * Search the state->lock_states for an existing lock_owner
838 * that is compatible with either of the given owners.
839 * If the second is non-zero, then the first refers to a Posix-lock
840 * owner (current->files) and the second refers to a flock/OFD
841 * owner (struct file*). In that case, prefer a match for the first
843 * If both sorts of locks are held on the one file we cannot know
844 * which stateid was intended to be used, so a "correct" choice cannot
845 * be made. Failing that, a "consistent" choice is preferable. The
846 * consistent choice we make is to prefer the first owner, that of a
849 static struct nfs4_lock_state *
850 __nfs4_find_lock_state(struct nfs4_state *state,
851 fl_owner_t fl_owner, fl_owner_t fl_owner2)
853 struct nfs4_lock_state *pos, *ret = NULL;
854 list_for_each_entry(pos, &state->lock_states, ls_locks) {
855 if (pos->ls_owner == fl_owner) {
859 if (pos->ls_owner == fl_owner2)
863 refcount_inc(&ret->ls_count);
868 * Return a compatible lock_state. If no initialized lock_state structure
869 * exists, return an uninitialized one.
872 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
874 struct nfs4_lock_state *lsp;
875 struct nfs_server *server = state->owner->so_server;
877 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
880 nfs4_init_seqid_counter(&lsp->ls_seqid);
881 refcount_set(&lsp->ls_count, 1);
882 lsp->ls_state = state;
883 lsp->ls_owner = fl_owner;
884 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
885 if (lsp->ls_seqid.owner_id < 0)
887 INIT_LIST_HEAD(&lsp->ls_locks);
894 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
896 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
897 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
902 * Return a compatible lock_state. If no initialized lock_state structure
903 * exists, return an uninitialized one.
906 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
908 struct nfs4_lock_state *lsp, *new = NULL;
911 spin_lock(&state->state_lock);
912 lsp = __nfs4_find_lock_state(state, owner, NULL);
916 list_add(&new->ls_locks, &state->lock_states);
917 set_bit(LK_STATE_IN_USE, &state->flags);
922 spin_unlock(&state->state_lock);
923 new = nfs4_alloc_lock_state(state, owner);
927 spin_unlock(&state->state_lock);
929 nfs4_free_lock_state(state->owner->so_server, new);
934 * Release reference to lock_state, and free it if we see that
935 * it is no longer in use
937 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
939 struct nfs_server *server;
940 struct nfs4_state *state;
944 state = lsp->ls_state;
945 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
947 list_del(&lsp->ls_locks);
948 if (list_empty(&state->lock_states))
949 clear_bit(LK_STATE_IN_USE, &state->flags);
950 spin_unlock(&state->state_lock);
951 server = state->owner->so_server;
952 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
953 struct nfs_client *clp = server->nfs_client;
955 clp->cl_mvops->free_lock_state(server, lsp);
957 nfs4_free_lock_state(server, lsp);
960 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
962 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
964 dst->fl_u.nfs4_fl.owner = lsp;
965 refcount_inc(&lsp->ls_count);
968 static void nfs4_fl_release_lock(struct file_lock *fl)
970 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
973 static const struct file_lock_operations nfs4_fl_lock_ops = {
974 .fl_copy_lock = nfs4_fl_copy_lock,
975 .fl_release_private = nfs4_fl_release_lock,
978 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
980 struct nfs4_lock_state *lsp;
982 if (fl->fl_ops != NULL)
984 lsp = nfs4_get_lock_state(state, fl->fl_owner);
987 fl->fl_u.nfs4_fl.owner = lsp;
988 fl->fl_ops = &nfs4_fl_lock_ops;
992 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
993 struct nfs4_state *state,
994 const struct nfs_lock_context *l_ctx)
996 struct nfs4_lock_state *lsp;
997 fl_owner_t fl_owner, fl_flock_owner;
1003 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
1006 fl_owner = l_ctx->lockowner;
1007 fl_flock_owner = l_ctx->open_context->flock_owner;
1009 spin_lock(&state->state_lock);
1010 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
1011 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
1013 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1014 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1017 spin_unlock(&state->state_lock);
1018 nfs4_put_lock_state(lsp);
1023 bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1026 const nfs4_stateid *src;
1031 src = &zero_stateid;
1032 seq = read_seqbegin(&state->seqlock);
1033 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1034 src = &state->open_stateid;
1037 nfs4_stateid_copy(dst, src);
1038 } while (read_seqretry(&state->seqlock, seq));
1043 * Byte-range lock aware utility to initialize the stateid of read/write
1046 int nfs4_select_rw_stateid(struct nfs4_state *state,
1047 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1048 nfs4_stateid *dst, const struct cred **cred)
1052 if (!nfs4_valid_open_stateid(state))
1056 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1058 /* A lost lock - don't even consider delegations */
1060 /* returns true if delegation stateid found and copied */
1061 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1066 /* nfs4_copy_delegation_stateid() didn't over-write
1067 * dst, so it still has the lock stateid which we now
1071 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1073 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1078 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1080 struct nfs_seqid *new;
1082 new = kmalloc(sizeof(*new), gfp_mask);
1084 return ERR_PTR(-ENOMEM);
1085 new->sequence = counter;
1086 INIT_LIST_HEAD(&new->list);
1091 void nfs_release_seqid(struct nfs_seqid *seqid)
1093 struct nfs_seqid_counter *sequence;
1095 if (seqid == NULL || list_empty(&seqid->list))
1097 sequence = seqid->sequence;
1098 spin_lock(&sequence->lock);
1099 list_del_init(&seqid->list);
1100 if (!list_empty(&sequence->list)) {
1101 struct nfs_seqid *next;
1103 next = list_first_entry(&sequence->list,
1104 struct nfs_seqid, list);
1105 rpc_wake_up_queued_task(&sequence->wait, next->task);
1107 spin_unlock(&sequence->lock);
1110 void nfs_free_seqid(struct nfs_seqid *seqid)
1112 nfs_release_seqid(seqid);
1117 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1118 * failed with a seqid incrementing error -
1119 * see comments nfs4.h:seqid_mutating_error()
1121 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1126 case -NFS4ERR_BAD_SEQID:
1127 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1129 pr_warn_ratelimited("NFS: v4 server returned a bad"
1130 " sequence-id error on an"
1131 " unconfirmed sequence %p!\n",
1134 case -NFS4ERR_STALE_CLIENTID:
1135 case -NFS4ERR_STALE_STATEID:
1136 case -NFS4ERR_BAD_STATEID:
1137 case -NFS4ERR_BADXDR:
1138 case -NFS4ERR_RESOURCE:
1139 case -NFS4ERR_NOFILEHANDLE:
1140 case -NFS4ERR_MOVED:
1141 /* Non-seqid mutating errors */
1145 * Note: no locking needed as we are guaranteed to be first
1146 * on the sequence list
1148 seqid->sequence->counter++;
1151 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1153 struct nfs4_state_owner *sp;
1158 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1159 if (status == -NFS4ERR_BAD_SEQID)
1160 nfs4_reset_state_owner(sp);
1161 if (!nfs4_has_session(sp->so_server->nfs_client))
1162 nfs_increment_seqid(status, seqid);
1166 * Increment the seqid if the LOCK/LOCKU succeeded, or
1167 * failed with a seqid incrementing error -
1168 * see comments nfs4.h:seqid_mutating_error()
1170 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1173 nfs_increment_seqid(status, seqid);
1176 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1178 struct nfs_seqid_counter *sequence;
1183 sequence = seqid->sequence;
1184 spin_lock(&sequence->lock);
1186 if (list_empty(&seqid->list))
1187 list_add_tail(&seqid->list, &sequence->list);
1188 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1190 rpc_sleep_on(&sequence->wait, task, NULL);
1193 spin_unlock(&sequence->lock);
1198 static int nfs4_run_state_manager(void *);
1200 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1202 smp_mb__before_atomic();
1203 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1204 smp_mb__after_atomic();
1205 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1206 rpc_wake_up(&clp->cl_rpcwaitq);
1210 * Schedule the nfs_client asynchronous state management routine
1212 void nfs4_schedule_state_manager(struct nfs_client *clp)
1214 struct task_struct *task;
1215 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1216 struct rpc_clnt *clnt = clp->cl_rpcclient;
1217 bool swapon = false;
1219 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1221 if (atomic_read(&clnt->cl_swapper)) {
1222 swapon = !test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE,
1225 wake_up_var(&clp->cl_state);
1230 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1233 __module_get(THIS_MODULE);
1234 refcount_inc(&clp->cl_count);
1236 /* The rcu_read_lock() is not strictly necessary, as the state
1237 * manager is the only thread that ever changes the rpc_xprt
1238 * after it's initialized. At this point, we're single threaded. */
1240 snprintf(buf, sizeof(buf), "%s-manager",
1241 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1243 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1245 printk(KERN_ERR "%s: kthread_run: %ld\n",
1246 __func__, PTR_ERR(task));
1247 if (!nfs_client_init_is_complete(clp))
1248 nfs_mark_client_ready(clp, PTR_ERR(task));
1250 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
1251 nfs4_clear_state_manager_bit(clp);
1252 nfs_put_client(clp);
1253 module_put(THIS_MODULE);
1258 * Schedule a lease recovery attempt
1260 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1264 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1265 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1266 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1268 nfs4_schedule_state_manager(clp);
1270 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1273 * nfs4_schedule_migration_recovery - trigger migration recovery
1275 * @server: FSID that is migrating
1277 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1278 * value is returned.
1280 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1282 struct nfs_client *clp = server->nfs_client;
1284 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1285 pr_err("NFS: volatile file handles not supported (server %s)\n",
1290 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1293 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1295 (unsigned long long)server->fsid.major,
1296 (unsigned long long)server->fsid.minor,
1299 set_bit(NFS_MIG_IN_TRANSITION,
1300 &((struct nfs_server *)server)->mig_status);
1301 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1303 nfs4_schedule_state_manager(clp);
1306 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1309 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1311 * @clp: server to check for moved leases
1314 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1316 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1317 __func__, clp->cl_clientid, clp->cl_hostname);
1319 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1320 nfs4_schedule_state_manager(clp);
1322 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1324 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1330 refcount_inc(&clp->cl_count);
1331 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1332 nfs_wait_bit_killable, TASK_KILLABLE);
1335 if (clp->cl_cons_state < 0)
1336 res = clp->cl_cons_state;
1338 nfs_put_client(clp);
1342 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1347 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1348 ret = nfs4_wait_clnt_recover(clp);
1351 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1352 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1354 nfs4_schedule_state_manager(clp);
1361 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1362 * @clp: client to process
1364 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1365 * resend of the SETCLIENTID and hence re-establish the
1366 * callback channel. Then return all existing delegations.
1368 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1370 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1371 nfs_expire_all_delegations(clp);
1372 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1376 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1378 nfs40_handle_cb_pathdown(clp);
1379 nfs4_schedule_state_manager(clp);
1382 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1385 if (!nfs4_valid_open_stateid(state))
1387 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1388 /* Don't recover state that expired before the reboot */
1389 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1390 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1393 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1394 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1398 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1400 if (!nfs4_valid_open_stateid(state))
1402 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1403 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1404 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1405 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1409 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1411 struct nfs_client *clp = server->nfs_client;
1413 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1415 nfs_inode_find_delegation_state_and_recover(state->inode,
1417 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1419 nfs4_schedule_state_manager(clp);
1422 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1424 static struct nfs4_lock_state *
1425 nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1426 const nfs4_stateid *stateid)
1428 struct nfs4_lock_state *pos;
1430 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1431 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1433 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
1439 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1440 const nfs4_stateid *stateid)
1444 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1445 spin_lock(&state->state_lock);
1446 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1448 spin_unlock(&state->state_lock);
1453 void nfs_inode_find_state_and_recover(struct inode *inode,
1454 const nfs4_stateid *stateid)
1456 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1457 struct nfs_inode *nfsi = NFS_I(inode);
1458 struct nfs_open_context *ctx;
1459 struct nfs4_state *state;
1463 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1467 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
1468 nfs4_state_mark_reclaim_nograce(clp, state)) {
1472 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1473 nfs4_stateid_match_or_older(&state->open_stateid, stateid) &&
1474 nfs4_state_mark_reclaim_nograce(clp, state)) {
1478 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1479 nfs4_state_mark_reclaim_nograce(clp, state))
1484 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1486 nfs4_schedule_state_manager(clp);
1489 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1491 struct inode *inode = state->inode;
1492 struct nfs_inode *nfsi = NFS_I(inode);
1493 struct nfs_open_context *ctx;
1496 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1497 if (ctx->state != state)
1499 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1500 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1501 "error = %d\n", ctx->dentry, err);
1506 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1508 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1509 nfs4_state_mark_open_context_bad(state, error);
1513 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1515 struct inode *inode = state->inode;
1516 struct nfs_inode *nfsi = NFS_I(inode);
1517 struct file_lock *fl;
1518 struct nfs4_lock_state *lsp;
1520 struct file_lock_context *flctx = inode->i_flctx;
1521 struct list_head *list;
1526 list = &flctx->flc_posix;
1528 /* Guard against delegation returns and new lock/unlock calls */
1529 down_write(&nfsi->rwsem);
1530 spin_lock(&flctx->flc_lock);
1532 list_for_each_entry(fl, list, fl_list) {
1533 if (nfs_file_open_context(fl->fl_file)->state != state)
1535 spin_unlock(&flctx->flc_lock);
1536 status = ops->recover_lock(state, fl);
1542 case -NFS4ERR_ADMIN_REVOKED:
1543 case -NFS4ERR_STALE_STATEID:
1544 case -NFS4ERR_BAD_STATEID:
1545 case -NFS4ERR_EXPIRED:
1546 case -NFS4ERR_NO_GRACE:
1547 case -NFS4ERR_STALE_CLIENTID:
1548 case -NFS4ERR_BADSESSION:
1549 case -NFS4ERR_BADSLOT:
1550 case -NFS4ERR_BAD_HIGH_SLOT:
1551 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1554 pr_err("NFS: %s: unhandled error %d\n",
1558 case -NFS4ERR_DENIED:
1559 case -NFS4ERR_RECLAIM_BAD:
1560 case -NFS4ERR_RECLAIM_CONFLICT:
1561 lsp = fl->fl_u.nfs4_fl.owner;
1563 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1566 spin_lock(&flctx->flc_lock);
1568 if (list == &flctx->flc_posix) {
1569 list = &flctx->flc_flock;
1572 spin_unlock(&flctx->flc_lock);
1574 up_write(&nfsi->rwsem);
1578 #ifdef CONFIG_NFS_V4_2
1579 static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1581 struct nfs4_copy_state *copy;
1583 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1584 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1587 spin_lock(&sp->so_server->nfs_client->cl_lock);
1588 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1589 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1590 !nfs4_stateid_match_other(&state->stateid,
1591 ©->parent_dst_state->stateid)))
1594 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1596 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1597 complete(©->completion);
1600 list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) {
1601 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1602 !nfs4_stateid_match_other(&state->stateid,
1603 ©->parent_src_state->stateid)))
1606 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1608 complete(©->completion);
1610 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1612 #else /* !CONFIG_NFS_V4_2 */
1613 static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1614 struct nfs4_state *state)
1617 #endif /* CONFIG_NFS_V4_2 */
1619 static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1620 const struct nfs4_state_recovery_ops *ops)
1622 struct nfs4_lock_state *lock;
1625 status = ops->recover_open(sp, state);
1629 status = nfs4_reclaim_locks(state, ops);
1633 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1634 spin_lock(&state->state_lock);
1635 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1636 trace_nfs4_state_lock_reclaim(state, lock);
1637 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1638 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__);
1640 spin_unlock(&state->state_lock);
1643 nfs42_complete_copies(sp, state);
1644 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1648 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1650 struct nfs4_state *state;
1651 unsigned int loop = 0;
1653 #ifdef CONFIG_NFS_V4_2
1654 bool found_ssc_copy_state = false;
1655 #endif /* CONFIG_NFS_V4_2 */
1657 /* Note: we rely on the sp->so_states list being ordered
1658 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1660 * This is needed to ensure that the server won't give us any
1661 * read delegations that we have to return if, say, we are
1662 * recovering after a network partition or a reboot from a
1663 * server that doesn't support a grace period.
1665 spin_lock(&sp->so_lock);
1666 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1668 list_for_each_entry(state, &sp->so_states, open_states) {
1669 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1671 if (!nfs4_valid_open_stateid(state))
1673 if (state->state == 0)
1675 #ifdef CONFIG_NFS_V4_2
1676 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1677 nfs4_state_mark_recovery_failed(state, -EIO);
1678 found_ssc_copy_state = true;
1681 #endif /* CONFIG_NFS_V4_2 */
1682 refcount_inc(&state->count);
1683 spin_unlock(&sp->so_lock);
1684 status = __nfs4_reclaim_open_state(sp, state, ops);
1692 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1700 /* Open state on this file cannot be recovered */
1701 nfs4_state_mark_recovery_failed(state, status);
1706 set_bit(ops->state_flag_bit, &state->flags);
1710 case -NFS4ERR_ADMIN_REVOKED:
1711 case -NFS4ERR_STALE_STATEID:
1712 case -NFS4ERR_OLD_STATEID:
1713 case -NFS4ERR_BAD_STATEID:
1714 case -NFS4ERR_RECLAIM_BAD:
1715 case -NFS4ERR_RECLAIM_CONFLICT:
1716 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1718 case -NFS4ERR_EXPIRED:
1719 case -NFS4ERR_NO_GRACE:
1720 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1722 case -NFS4ERR_STALE_CLIENTID:
1723 case -NFS4ERR_BADSESSION:
1724 case -NFS4ERR_BADSLOT:
1725 case -NFS4ERR_BAD_HIGH_SLOT:
1726 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1730 nfs4_put_open_state(state);
1731 spin_lock(&sp->so_lock);
1734 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1735 spin_unlock(&sp->so_lock);
1736 #ifdef CONFIG_NFS_V4_2
1737 if (found_ssc_copy_state)
1739 #endif /* CONFIG_NFS_V4_2 */
1742 nfs4_put_open_state(state);
1743 spin_lock(&sp->so_lock);
1744 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1745 spin_unlock(&sp->so_lock);
1749 static void nfs4_clear_open_state(struct nfs4_state *state)
1751 struct nfs4_lock_state *lock;
1753 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1754 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1755 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1756 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1757 spin_lock(&state->state_lock);
1758 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1759 lock->ls_seqid.flags = 0;
1760 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1762 spin_unlock(&state->state_lock);
1765 static void nfs4_reset_seqids(struct nfs_server *server,
1766 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1768 struct nfs_client *clp = server->nfs_client;
1769 struct nfs4_state_owner *sp;
1770 struct rb_node *pos;
1771 struct nfs4_state *state;
1773 spin_lock(&clp->cl_lock);
1774 for (pos = rb_first(&server->state_owners);
1776 pos = rb_next(pos)) {
1777 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1778 sp->so_seqid.flags = 0;
1779 spin_lock(&sp->so_lock);
1780 list_for_each_entry(state, &sp->so_states, open_states) {
1781 if (mark_reclaim(clp, state))
1782 nfs4_clear_open_state(state);
1784 spin_unlock(&sp->so_lock);
1786 spin_unlock(&clp->cl_lock);
1789 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1790 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1792 struct nfs_server *server;
1795 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1796 nfs4_reset_seqids(server, mark_reclaim);
1800 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1802 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1803 /* Mark all delegations for reclaim */
1804 nfs_delegation_mark_reclaim(clp);
1805 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1808 static int nfs4_reclaim_complete(struct nfs_client *clp,
1809 const struct nfs4_state_recovery_ops *ops,
1810 const struct cred *cred)
1812 /* Notify the server we're done reclaiming our state */
1813 if (ops->reclaim_complete)
1814 return ops->reclaim_complete(clp, cred);
1818 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1820 struct nfs_client *clp = server->nfs_client;
1821 struct nfs4_state_owner *sp;
1822 struct rb_node *pos;
1823 struct nfs4_state *state;
1825 spin_lock(&clp->cl_lock);
1826 for (pos = rb_first(&server->state_owners);
1828 pos = rb_next(pos)) {
1829 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1830 spin_lock(&sp->so_lock);
1831 list_for_each_entry(state, &sp->so_states, open_states) {
1832 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1835 nfs4_state_mark_reclaim_nograce(clp, state);
1837 spin_unlock(&sp->so_lock);
1839 spin_unlock(&clp->cl_lock);
1842 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1844 struct nfs_server *server;
1846 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1850 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1851 nfs4_clear_reclaim_server(server);
1854 nfs_delegation_reap_unclaimed(clp);
1858 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1860 const struct nfs4_state_recovery_ops *ops;
1861 const struct cred *cred;
1864 if (!nfs4_state_clear_reclaim_reboot(clp))
1866 ops = clp->cl_mvops->reboot_recovery_ops;
1867 cred = nfs4_get_clid_cred(clp);
1868 err = nfs4_reclaim_complete(clp, ops, cred);
1870 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1871 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1874 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1876 nfs_mark_test_expired_all_delegations(clp);
1877 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1880 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1885 case -NFS4ERR_CB_PATH_DOWN:
1886 nfs40_handle_cb_pathdown(clp);
1888 case -NFS4ERR_NO_GRACE:
1889 nfs4_state_end_reclaim_reboot(clp);
1891 case -NFS4ERR_STALE_CLIENTID:
1892 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1893 nfs4_state_start_reclaim_reboot(clp);
1895 case -NFS4ERR_EXPIRED:
1896 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1897 nfs4_state_start_reclaim_nograce(clp);
1899 case -NFS4ERR_BADSESSION:
1900 case -NFS4ERR_BADSLOT:
1901 case -NFS4ERR_BAD_HIGH_SLOT:
1902 case -NFS4ERR_DEADSESSION:
1903 case -NFS4ERR_SEQ_FALSE_RETRY:
1904 case -NFS4ERR_SEQ_MISORDERED:
1905 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1906 /* Zero session reset errors */
1908 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1909 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1912 dprintk("%s: failed to handle error %d for server %s\n",
1913 __func__, error, clp->cl_hostname);
1916 dprintk("%s: handled error %d for server %s\n", __func__, error,
1921 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1923 struct nfs4_state_owner *sp;
1924 struct nfs_server *server;
1925 struct rb_node *pos;
1931 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1932 nfs4_purge_state_owners(server, &freeme);
1933 spin_lock(&clp->cl_lock);
1934 for (pos = rb_first(&server->state_owners);
1936 pos = rb_next(pos)) {
1938 struct nfs4_state_owner, so_server_node);
1939 if (!test_and_clear_bit(ops->owner_flag_bit,
1942 if (!atomic_inc_not_zero(&sp->so_count))
1944 spin_unlock(&clp->cl_lock);
1947 status = nfs4_reclaim_open_state(sp, ops);
1949 set_bit(ops->owner_flag_bit, &sp->so_flags);
1950 nfs4_put_state_owner(sp);
1951 status = nfs4_recovery_handle_error(clp, status);
1952 return (status != 0) ? status : -EAGAIN;
1955 nfs4_put_state_owner(sp);
1958 spin_unlock(&clp->cl_lock);
1961 nfs4_free_state_owners(&freeme);
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;
2027 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2028 * in nfs4_exchange_id */
2030 dprintk("%s: exit with error %d for server %s\n", __func__,
2031 status, clp->cl_hostname);
2034 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2035 dprintk("%s: handled error %d for server %s\n", __func__, status,
2040 static int nfs4_establish_lease(struct nfs_client *clp)
2042 const struct cred *cred;
2043 const struct nfs4_state_recovery_ops *ops =
2044 clp->cl_mvops->reboot_recovery_ops;
2047 status = nfs4_begin_drain_session(clp);
2050 cred = nfs4_get_clid_cred(clp);
2053 status = ops->establish_clid(clp, cred);
2057 pnfs_destroy_all_layouts(clp);
2062 * Returns zero or a negative errno. NFS4ERR values are converted
2063 * to local errno values.
2065 static int nfs4_reclaim_lease(struct nfs_client *clp)
2069 status = nfs4_establish_lease(clp);
2071 return nfs4_handle_reclaim_lease_error(clp, status);
2072 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2073 nfs4_state_start_reclaim_nograce(clp);
2074 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2075 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2076 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2077 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2081 static int nfs4_purge_lease(struct nfs_client *clp)
2085 status = nfs4_establish_lease(clp);
2087 return nfs4_handle_reclaim_lease_error(clp, status);
2088 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2089 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2090 nfs4_state_start_reclaim_nograce(clp);
2095 * Try remote migration of one FSID from a source server to a
2096 * destination server. The source server provides a list of
2097 * potential destinations.
2099 * Returns zero or a negative NFS4ERR status code.
2101 static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2103 struct nfs_client *clp = server->nfs_client;
2104 struct nfs4_fs_locations *locations = NULL;
2105 struct inode *inode;
2109 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2110 (unsigned long long)server->fsid.major,
2111 (unsigned long long)server->fsid.minor,
2115 page = alloc_page(GFP_KERNEL);
2116 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2117 if (page == NULL || locations == NULL) {
2118 dprintk("<-- %s: no memory\n", __func__);
2121 locations->fattr = nfs_alloc_fattr();
2122 if (locations->fattr == NULL) {
2123 dprintk("<-- %s: no memory\n", __func__);
2127 inode = d_inode(server->super->s_root);
2128 result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
2131 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2136 result = -NFS4ERR_NXIO;
2137 if (!locations->nlocations)
2140 if (!(locations->fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2141 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2146 status = nfs4_begin_drain_session(clp);
2152 status = nfs4_replace_transport(server, locations);
2154 dprintk("<-- %s: failed to replace transport: %d\n",
2160 dprintk("<-- %s: migration succeeded\n", __func__);
2165 if (locations != NULL)
2166 kfree(locations->fattr);
2169 pr_err("NFS: migration recovery failed (server %s)\n",
2171 set_bit(NFS_MIG_FAILED, &server->mig_status);
2177 * Returns zero or a negative NFS4ERR status code.
2179 static int nfs4_handle_migration(struct nfs_client *clp)
2181 const struct nfs4_state_maintenance_ops *ops =
2182 clp->cl_mvops->state_renewal_ops;
2183 struct nfs_server *server;
2184 const struct cred *cred;
2186 dprintk("%s: migration reported on \"%s\"\n", __func__,
2189 cred = ops->get_state_renewal_cred(clp);
2191 return -NFS4ERR_NOENT;
2196 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2199 if (server->mig_gen == clp->cl_mig_gen)
2201 server->mig_gen = clp->cl_mig_gen;
2203 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2204 &server->mig_status))
2208 status = nfs4_try_migration(server, cred);
2221 * Test each nfs_server on the clp's cl_superblocks list to see
2222 * if it's moved to another server. Stop when the server no longer
2223 * returns NFS4ERR_LEASE_MOVED.
2225 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2227 const struct nfs4_state_maintenance_ops *ops =
2228 clp->cl_mvops->state_renewal_ops;
2229 struct nfs_server *server;
2230 const struct cred *cred;
2232 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2235 cred = ops->get_state_renewal_cred(clp);
2237 return -NFS4ERR_NOENT;
2242 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2243 struct inode *inode;
2246 if (server->mig_gen == clp->cl_mig_gen)
2248 server->mig_gen = clp->cl_mig_gen;
2252 inode = d_inode(server->super->s_root);
2253 status = nfs4_proc_fsid_present(inode, cred);
2254 if (status != -NFS4ERR_MOVED)
2255 goto restart; /* wasn't this one */
2256 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2257 goto restart; /* there are more */
2268 * nfs4_discover_server_trunking - Detect server IP address trunking
2270 * @clp: nfs_client under test
2271 * @result: OUT: found nfs_client, or clp
2273 * Returns zero or a negative errno. If zero is returned,
2274 * an nfs_client pointer is planted in "result".
2276 * Note: since we are invoked in process context, and
2277 * not from inside the state manager, we cannot use
2278 * nfs4_handle_reclaim_lease_error().
2280 int nfs4_discover_server_trunking(struct nfs_client *clp,
2281 struct nfs_client **result)
2283 const struct nfs4_state_recovery_ops *ops =
2284 clp->cl_mvops->reboot_recovery_ops;
2285 struct rpc_clnt *clnt;
2286 const struct cred *cred;
2289 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2291 clnt = clp->cl_rpcclient;
2294 mutex_lock(&nfs_clid_init_mutex);
2297 cred = nfs4_get_clid_cred(clp);
2301 status = ops->detect_trunking(clp, result, cred);
2309 if (clnt->cl_softrtry)
2312 case -NFS4ERR_DELAY:
2316 case -NFS4ERR_STALE_CLIENTID:
2317 dprintk("NFS: %s after status %d, retrying\n",
2322 nfs4_root_machine_cred(clp);
2325 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2328 case -NFS4ERR_CLID_INUSE:
2329 case -NFS4ERR_WRONGSEC:
2330 /* No point in retrying if we already used RPC_AUTH_UNIX */
2331 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2335 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2337 status = PTR_ERR(clnt);
2340 /* Note: this is safe because we haven't yet marked the
2341 * client as ready, so we are the only user of
2344 clnt = xchg(&clp->cl_rpcclient, clnt);
2345 rpc_shutdown_client(clnt);
2346 clnt = clp->cl_rpcclient;
2349 case -NFS4ERR_MINOR_VERS_MISMATCH:
2350 status = -EPROTONOSUPPORT;
2354 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2355 * in nfs4_exchange_id */
2356 status = -EKEYEXPIRED;
2359 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2365 mutex_unlock(&nfs_clid_init_mutex);
2366 dprintk("NFS: %s: status = %d\n", __func__, status);
2370 #ifdef CONFIG_NFS_V4_1
2371 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2373 struct nfs_client *clp = session->clp;
2377 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2379 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2380 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2382 nfs4_schedule_state_manager(clp);
2384 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2386 void nfs41_notify_server(struct nfs_client *clp)
2388 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2389 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2390 nfs4_schedule_state_manager(clp);
2393 static void nfs4_reset_all_state(struct nfs_client *clp)
2395 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2396 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2397 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2398 nfs4_state_start_reclaim_nograce(clp);
2399 dprintk("%s: scheduling reset of all state for server %s!\n",
2400 __func__, clp->cl_hostname);
2401 nfs4_schedule_state_manager(clp);
2405 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2407 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2408 nfs4_state_start_reclaim_reboot(clp);
2409 dprintk("%s: server %s rebooted!\n", __func__,
2411 nfs4_schedule_state_manager(clp);
2415 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2417 nfs4_reset_all_state(clp);
2418 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2421 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2423 nfs4_state_start_reclaim_nograce(clp);
2424 nfs4_schedule_state_manager(clp);
2426 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2429 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2431 /* FIXME: For now, we destroy all layouts. */
2432 pnfs_destroy_all_layouts(clp);
2433 nfs_test_expired_all_delegations(clp);
2434 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2438 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2440 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2441 nfs4_schedule_state_manager(clp);
2443 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2447 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2449 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2450 &clp->cl_state) == 0)
2451 nfs4_schedule_state_manager(clp);
2454 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2460 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2461 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2463 * If we're called from the state manager thread, then assume we're
2464 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2465 * Those flags are expected to remain set until we're done
2466 * recovering (see RFC5661, section 18.46.3).
2471 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2472 nfs41_handle_server_reboot(clp);
2473 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2474 nfs41_handle_all_state_revoked(clp);
2475 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2476 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2477 nfs41_handle_some_state_revoked(clp);
2478 if (flags & SEQ4_STATUS_LEASE_MOVED)
2479 nfs4_schedule_lease_moved_recovery(clp);
2480 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2481 nfs41_handle_recallable_state_revoked(clp);
2483 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2484 nfs41_handle_backchannel_fault(clp);
2485 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2486 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2487 nfs41_handle_cb_path_down(clp);
2490 static int nfs4_reset_session(struct nfs_client *clp)
2492 const struct cred *cred;
2495 if (!nfs4_has_session(clp))
2497 status = nfs4_begin_drain_session(clp);
2500 cred = nfs4_get_clid_cred(clp);
2501 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2504 case -NFS4ERR_BADSESSION:
2505 case -NFS4ERR_DEADSESSION:
2507 case -NFS4ERR_BACK_CHAN_BUSY:
2508 case -NFS4ERR_DELAY:
2509 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2514 status = nfs4_recovery_handle_error(clp, status);
2518 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2519 status = nfs4_proc_create_session(clp, cred);
2521 dprintk("%s: session reset failed with status %d for server %s!\n",
2522 __func__, status, clp->cl_hostname);
2523 status = nfs4_handle_reclaim_lease_error(clp, status);
2526 nfs41_finish_session_reset(clp);
2527 dprintk("%s: session reset was successful for server %s!\n",
2528 __func__, clp->cl_hostname);
2534 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2536 const struct cred *cred;
2539 if (!nfs4_has_session(clp))
2541 ret = nfs4_begin_drain_session(clp);
2544 cred = nfs4_get_clid_cred(clp);
2545 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2547 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2550 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2551 __func__, clp->cl_hostname);
2553 case -NFS4ERR_DELAY:
2555 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2558 return nfs4_recovery_handle_error(clp, ret);
2563 static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2567 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2568 iomode += IOMODE_READ;
2569 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2570 iomode += IOMODE_RW;
2571 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2573 pnfs_layout_return_unused_byclid(clp, iomode);
2574 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2577 #else /* CONFIG_NFS_V4_1 */
2578 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2580 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2585 static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2588 #endif /* CONFIG_NFS_V4_1 */
2590 static void nfs4_state_manager(struct nfs_client *clp)
2592 unsigned int memflags;
2594 const char *section = "", *section_sep = "";
2597 * State recovery can deadlock if the direct reclaim code tries
2598 * start NFS writeback. So ensure memory allocations are all
2601 memflags = memalloc_nofs_save();
2603 /* Ensure exclusive access to NFSv4 state */
2605 trace_nfs4_state_mgr(clp);
2606 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2607 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2608 section = "purge state";
2609 status = nfs4_purge_lease(clp);
2615 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2616 section = "lease expired";
2617 /* We're going to have to re-establish a clientid */
2618 status = nfs4_reclaim_lease(clp);
2624 /* Initialize or reset the session */
2625 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2626 section = "reset session";
2627 status = nfs4_reset_session(clp);
2628 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2634 /* Send BIND_CONN_TO_SESSION */
2635 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2637 section = "bind conn to session";
2638 status = nfs4_bind_conn_to_session(clp);
2644 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2645 section = "check lease";
2646 status = nfs4_check_lease(clp);
2652 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2653 section = "migration";
2654 status = nfs4_handle_migration(clp);
2659 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2660 section = "lease moved";
2661 status = nfs4_handle_lease_moved(clp);
2666 /* First recover reboot state... */
2667 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2668 section = "reclaim reboot";
2669 status = nfs4_do_reclaim(clp,
2670 clp->cl_mvops->reboot_recovery_ops);
2671 if (status == -EAGAIN)
2675 nfs4_state_end_reclaim_reboot(clp);
2679 /* Detect expired delegations... */
2680 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2681 section = "detect expired delegations";
2682 nfs_reap_expired_delegations(clp);
2686 /* Now recover expired state... */
2687 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2688 section = "reclaim nograce";
2689 status = nfs4_do_reclaim(clp,
2690 clp->cl_mvops->nograce_recovery_ops);
2691 if (status == -EAGAIN)
2695 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2698 memalloc_nofs_restore(memflags);
2699 nfs4_end_drain_session(clp);
2700 nfs4_clear_state_manager_bit(clp);
2702 if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2703 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING,
2705 memflags = memalloc_nofs_save();
2709 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
2710 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2711 nfs_client_return_marked_delegations(clp);
2712 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2714 nfs4_layoutreturn_any_run(clp);
2715 clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state);
2720 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2724 if (strlen(section))
2726 trace_nfs4_state_mgr_failed(clp, section, status);
2727 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2728 " with error %d\n", section_sep, section,
2729 clp->cl_hostname, -status);
2732 memalloc_nofs_restore(memflags);
2733 nfs4_end_drain_session(clp);
2734 nfs4_clear_state_manager_bit(clp);
2737 static int nfs4_run_state_manager(void *ptr)
2739 struct nfs_client *clp = ptr;
2740 struct rpc_clnt *cl = clp->cl_rpcclient;
2742 while (cl != cl->cl_parent)
2745 allow_signal(SIGKILL);
2747 nfs4_state_manager(clp);
2749 if (test_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) &&
2750 !test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state)) {
2751 wait_var_event_interruptible(&clp->cl_state,
2752 test_bit(NFS4CLNT_RUN_MANAGER,
2754 if (!atomic_read(&cl->cl_swapper))
2755 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2756 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2757 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2759 /* Either no longer a swapper, or were signalled */
2760 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2763 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2764 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2765 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2768 nfs_put_client(clp);
2769 module_put_and_exit(0);