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/nfs_idmap.h>
46 #include <linux/kthread.h>
47 #include <linux/module.h>
48 #include <linux/random.h>
49 #include <linux/ratelimit.h>
50 #include <linux/workqueue.h>
51 #include <linux/bitops.h>
52 #include <linux/jiffies.h>
56 #include "delegation.h"
60 #define OPENOWNER_POOL_SIZE 8
62 const nfs4_stateid zero_stateid;
64 static LIST_HEAD(nfs4_clientid_list);
66 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
68 struct nfs4_setclientid_res clid = {
69 .clientid = clp->cl_clientid,
70 .confirm = clp->cl_confirm,
75 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
77 port = nfs_callback_tcpport;
78 if (clp->cl_addr.ss_family == AF_INET6)
79 port = nfs_callback_tcpport6;
81 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
84 clp->cl_clientid = clid.clientid;
85 clp->cl_confirm = clid.confirm;
86 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
88 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
91 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
92 nfs4_schedule_state_renewal(clp);
97 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
99 struct rpc_cred *cred = NULL;
101 if (clp->cl_machine_cred != NULL)
102 cred = get_rpccred(clp->cl_machine_cred);
106 static void nfs4_clear_machine_cred(struct nfs_client *clp)
108 struct rpc_cred *cred;
110 spin_lock(&clp->cl_lock);
111 cred = clp->cl_machine_cred;
112 clp->cl_machine_cred = NULL;
113 spin_unlock(&clp->cl_lock);
118 static struct rpc_cred *
119 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
121 struct rpc_cred *cred = NULL;
122 struct nfs4_state_owner *sp;
125 for (pos = rb_first(&server->state_owners);
127 pos = rb_next(pos)) {
128 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
129 if (list_empty(&sp->so_states))
131 cred = get_rpccred(sp->so_cred);
138 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
139 * @clp: client state handle
141 * Returns an rpc_cred with reference count bumped, or NULL.
142 * Caller must hold clp->cl_lock.
144 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
146 struct rpc_cred *cred = NULL;
147 struct nfs_server *server;
150 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
151 cred = nfs4_get_renew_cred_server_locked(server);
159 #if defined(CONFIG_NFS_V4_1)
161 static int nfs41_setup_state_renewal(struct nfs_client *clp)
164 struct nfs_fsinfo fsinfo;
166 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
167 nfs4_schedule_state_renewal(clp);
171 status = nfs4_proc_get_lease_time(clp, &fsinfo);
173 /* Update lease time and schedule renewal */
174 spin_lock(&clp->cl_lock);
175 clp->cl_lease_time = fsinfo.lease_time * HZ;
176 clp->cl_last_renewal = jiffies;
177 spin_unlock(&clp->cl_lock);
179 nfs4_schedule_state_renewal(clp);
186 * Back channel returns NFS4ERR_DELAY for new requests when
187 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
190 static void nfs4_end_drain_session(struct nfs_client *clp)
192 struct nfs4_session *ses = clp->cl_session;
197 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
198 spin_lock(&ses->fc_slot_table.slot_tbl_lock);
199 max_slots = ses->fc_slot_table.max_slots;
200 while (max_slots--) {
201 struct rpc_task *task;
203 task = rpc_wake_up_next(&ses->fc_slot_table.
207 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
209 spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
213 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
215 spin_lock(&tbl->slot_tbl_lock);
216 if (tbl->highest_used_slotid != -1) {
217 INIT_COMPLETION(tbl->complete);
218 spin_unlock(&tbl->slot_tbl_lock);
219 return wait_for_completion_interruptible(&tbl->complete);
221 spin_unlock(&tbl->slot_tbl_lock);
225 static int nfs4_begin_drain_session(struct nfs_client *clp)
227 struct nfs4_session *ses = clp->cl_session;
230 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
232 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
236 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
239 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
243 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
245 nfs4_begin_drain_session(clp);
246 status = nfs4_proc_exchange_id(clp, cred);
249 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
251 status = nfs4_proc_create_session(clp);
254 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
255 nfs41_setup_state_renewal(clp);
256 nfs_mark_client_ready(clp, NFS_CS_READY);
261 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
263 struct rpc_cred *cred;
265 spin_lock(&clp->cl_lock);
266 cred = nfs4_get_machine_cred_locked(clp);
267 spin_unlock(&clp->cl_lock);
271 #endif /* CONFIG_NFS_V4_1 */
273 static struct rpc_cred *
274 nfs4_get_setclientid_cred_server(struct nfs_server *server)
276 struct nfs_client *clp = server->nfs_client;
277 struct rpc_cred *cred = NULL;
278 struct nfs4_state_owner *sp;
281 spin_lock(&clp->cl_lock);
282 pos = rb_first(&server->state_owners);
284 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
285 cred = get_rpccred(sp->so_cred);
287 spin_unlock(&clp->cl_lock);
292 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
293 * @clp: client state handle
295 * Returns an rpc_cred with reference count bumped, or NULL.
297 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
299 struct nfs_server *server;
300 struct rpc_cred *cred;
302 spin_lock(&clp->cl_lock);
303 cred = nfs4_get_machine_cred_locked(clp);
304 spin_unlock(&clp->cl_lock);
309 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
310 cred = nfs4_get_setclientid_cred_server(server);
320 static void nfs_alloc_unique_id_locked(struct rb_root *root,
321 struct nfs_unique_id *new,
322 __u64 minval, int maxbits)
324 struct rb_node **p, *parent;
325 struct nfs_unique_id *pos;
329 mask = (1ULL << maxbits) - 1ULL;
331 /* Ensure distribution is more or less flat */
332 get_random_bytes(&new->id, sizeof(new->id));
334 if (new->id < minval)
342 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
344 if (new->id < pos->id)
346 else if (new->id > pos->id)
351 rb_link_node(&new->rb_node, parent, p);
352 rb_insert_color(&new->rb_node, root);
357 if (new->id < minval || (new->id & mask) != new->id) {
361 parent = rb_next(parent);
364 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
365 if (new->id < pos->id)
371 static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
373 rb_erase(&id->rb_node, root);
376 static struct nfs4_state_owner *
377 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
379 struct rb_node **p = &server->state_owners.rb_node,
381 struct nfs4_state_owner *sp;
385 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
387 if (cred < sp->so_cred)
388 p = &parent->rb_left;
389 else if (cred > sp->so_cred)
390 p = &parent->rb_right;
392 if (!list_empty(&sp->so_lru))
393 list_del_init(&sp->so_lru);
394 atomic_inc(&sp->so_count);
401 static struct nfs4_state_owner *
402 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
404 struct nfs_server *server = new->so_server;
405 struct rb_node **p = &server->state_owners.rb_node,
407 struct nfs4_state_owner *sp;
411 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
413 if (new->so_cred < sp->so_cred)
414 p = &parent->rb_left;
415 else if (new->so_cred > sp->so_cred)
416 p = &parent->rb_right;
418 if (!list_empty(&sp->so_lru))
419 list_del_init(&sp->so_lru);
420 atomic_inc(&sp->so_count);
424 nfs_alloc_unique_id_locked(&server->openowner_id,
425 &new->so_owner_id, 1, 64);
426 rb_link_node(&new->so_server_node, parent, p);
427 rb_insert_color(&new->so_server_node, &server->state_owners);
432 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
434 struct nfs_server *server = sp->so_server;
436 if (!RB_EMPTY_NODE(&sp->so_server_node))
437 rb_erase(&sp->so_server_node, &server->state_owners);
438 nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id);
442 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
443 * create a new state_owner.
446 static struct nfs4_state_owner *
447 nfs4_alloc_state_owner(void)
449 struct nfs4_state_owner *sp;
451 sp = kzalloc(sizeof(*sp),GFP_NOFS);
454 spin_lock_init(&sp->so_lock);
455 INIT_LIST_HEAD(&sp->so_states);
456 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
457 sp->so_seqid.sequence = &sp->so_sequence;
458 spin_lock_init(&sp->so_sequence.lock);
459 INIT_LIST_HEAD(&sp->so_sequence.list);
460 atomic_set(&sp->so_count, 1);
461 INIT_LIST_HEAD(&sp->so_lru);
466 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
468 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
469 struct nfs_server *server = sp->so_server;
470 struct nfs_client *clp = server->nfs_client;
472 spin_lock(&clp->cl_lock);
473 rb_erase(&sp->so_server_node, &server->state_owners);
474 RB_CLEAR_NODE(&sp->so_server_node);
475 spin_unlock(&clp->cl_lock);
479 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
481 rpc_destroy_wait_queue(&sp->so_sequence.wait);
482 put_rpccred(sp->so_cred);
486 static void nfs4_gc_state_owners(struct nfs_server *server)
488 struct nfs_client *clp = server->nfs_client;
489 struct nfs4_state_owner *sp, *tmp;
490 unsigned long time_min, time_max;
493 spin_lock(&clp->cl_lock);
495 time_min = (long)time_max - (long)clp->cl_lease_time;
496 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
497 /* NB: LRU is sorted so that oldest is at the head */
498 if (time_in_range(sp->so_expires, time_min, time_max))
500 list_move(&sp->so_lru, &doomed);
501 nfs4_remove_state_owner_locked(sp);
503 spin_unlock(&clp->cl_lock);
505 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
506 list_del(&sp->so_lru);
507 nfs4_free_state_owner(sp);
512 * nfs4_get_state_owner - Look up a state owner given a credential
513 * @server: nfs_server to search
514 * @cred: RPC credential to match
516 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
518 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
519 struct rpc_cred *cred)
521 struct nfs_client *clp = server->nfs_client;
522 struct nfs4_state_owner *sp, *new;
524 spin_lock(&clp->cl_lock);
525 sp = nfs4_find_state_owner_locked(server, cred);
526 spin_unlock(&clp->cl_lock);
529 new = nfs4_alloc_state_owner();
532 new->so_server = server;
534 spin_lock(&clp->cl_lock);
535 sp = nfs4_insert_state_owner_locked(new);
536 spin_unlock(&clp->cl_lock);
540 rpc_destroy_wait_queue(&new->so_sequence.wait);
544 nfs4_gc_state_owners(server);
549 * nfs4_put_state_owner - Release a nfs4_state_owner
550 * @sp: state owner data to release
552 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
554 struct nfs_server *server = sp->so_server;
555 struct nfs_client *clp = server->nfs_client;
557 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
560 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
561 sp->so_expires = jiffies;
562 list_add_tail(&sp->so_lru, &server->state_owners_lru);
563 spin_unlock(&clp->cl_lock);
565 nfs4_remove_state_owner_locked(sp);
566 spin_unlock(&clp->cl_lock);
567 nfs4_free_state_owner(sp);
572 * nfs4_purge_state_owners - Release all cached state owners
573 * @server: nfs_server with cached state owners to release
575 * Called at umount time. Remaining state owners will be on
576 * the LRU with ref count of zero.
578 void nfs4_purge_state_owners(struct nfs_server *server)
580 struct nfs_client *clp = server->nfs_client;
581 struct nfs4_state_owner *sp, *tmp;
584 spin_lock(&clp->cl_lock);
585 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
586 list_move(&sp->so_lru, &doomed);
587 nfs4_remove_state_owner_locked(sp);
589 spin_unlock(&clp->cl_lock);
591 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
592 list_del(&sp->so_lru);
593 nfs4_free_state_owner(sp);
597 static struct nfs4_state *
598 nfs4_alloc_open_state(void)
600 struct nfs4_state *state;
602 state = kzalloc(sizeof(*state), GFP_NOFS);
605 atomic_set(&state->count, 1);
606 INIT_LIST_HEAD(&state->lock_states);
607 spin_lock_init(&state->state_lock);
608 seqlock_init(&state->seqlock);
613 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
615 if (state->state == fmode)
617 /* NB! List reordering - see the reclaim code for why. */
618 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
619 if (fmode & FMODE_WRITE)
620 list_move(&state->open_states, &state->owner->so_states);
622 list_move_tail(&state->open_states, &state->owner->so_states);
624 state->state = fmode;
627 static struct nfs4_state *
628 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
630 struct nfs_inode *nfsi = NFS_I(inode);
631 struct nfs4_state *state;
633 list_for_each_entry(state, &nfsi->open_states, inode_states) {
634 if (state->owner != owner)
636 if (atomic_inc_not_zero(&state->count))
643 nfs4_free_open_state(struct nfs4_state *state)
649 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
651 struct nfs4_state *state, *new;
652 struct nfs_inode *nfsi = NFS_I(inode);
654 spin_lock(&inode->i_lock);
655 state = __nfs4_find_state_byowner(inode, owner);
656 spin_unlock(&inode->i_lock);
659 new = nfs4_alloc_open_state();
660 spin_lock(&owner->so_lock);
661 spin_lock(&inode->i_lock);
662 state = __nfs4_find_state_byowner(inode, owner);
663 if (state == NULL && new != NULL) {
665 state->owner = owner;
666 atomic_inc(&owner->so_count);
667 list_add(&state->inode_states, &nfsi->open_states);
669 state->inode = inode;
670 spin_unlock(&inode->i_lock);
671 /* Note: The reclaim code dictates that we add stateless
672 * and read-only stateids to the end of the list */
673 list_add_tail(&state->open_states, &owner->so_states);
674 spin_unlock(&owner->so_lock);
676 spin_unlock(&inode->i_lock);
677 spin_unlock(&owner->so_lock);
679 nfs4_free_open_state(new);
685 void nfs4_put_open_state(struct nfs4_state *state)
687 struct inode *inode = state->inode;
688 struct nfs4_state_owner *owner = state->owner;
690 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
692 spin_lock(&inode->i_lock);
693 list_del(&state->inode_states);
694 list_del(&state->open_states);
695 spin_unlock(&inode->i_lock);
696 spin_unlock(&owner->so_lock);
698 nfs4_free_open_state(state);
699 nfs4_put_state_owner(owner);
703 * Close the current file.
705 static void __nfs4_close(struct nfs4_state *state,
706 fmode_t fmode, gfp_t gfp_mask, int wait)
708 struct nfs4_state_owner *owner = state->owner;
712 atomic_inc(&owner->so_count);
713 /* Protect against nfs4_find_state() */
714 spin_lock(&owner->so_lock);
715 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
722 case FMODE_READ|FMODE_WRITE:
725 newstate = FMODE_READ|FMODE_WRITE;
726 if (state->n_rdwr == 0) {
727 if (state->n_rdonly == 0) {
728 newstate &= ~FMODE_READ;
729 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
730 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
732 if (state->n_wronly == 0) {
733 newstate &= ~FMODE_WRITE;
734 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
735 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
738 clear_bit(NFS_DELEGATED_STATE, &state->flags);
740 nfs4_state_set_mode_locked(state, newstate);
741 spin_unlock(&owner->so_lock);
744 nfs4_put_open_state(state);
745 nfs4_put_state_owner(owner);
747 bool roc = pnfs_roc(state->inode);
749 nfs4_do_close(state, gfp_mask, wait, roc);
753 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
755 __nfs4_close(state, fmode, GFP_NOFS, 0);
758 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
760 __nfs4_close(state, fmode, GFP_KERNEL, 1);
764 * Search the state->lock_states for an existing lock_owner
765 * that is compatible with current->files
767 static struct nfs4_lock_state *
768 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
770 struct nfs4_lock_state *pos;
771 list_for_each_entry(pos, &state->lock_states, ls_locks) {
772 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
774 switch (pos->ls_owner.lo_type) {
775 case NFS4_POSIX_LOCK_TYPE:
776 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
779 case NFS4_FLOCK_LOCK_TYPE:
780 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
783 atomic_inc(&pos->ls_count);
790 * Return a compatible lock_state. If no initialized lock_state structure
791 * exists, return an uninitialized one.
794 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
796 struct nfs4_lock_state *lsp;
797 struct nfs_server *server = state->owner->so_server;
798 struct nfs_client *clp = server->nfs_client;
800 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
803 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
804 spin_lock_init(&lsp->ls_sequence.lock);
805 INIT_LIST_HEAD(&lsp->ls_sequence.list);
806 lsp->ls_seqid.sequence = &lsp->ls_sequence;
807 atomic_set(&lsp->ls_count, 1);
808 lsp->ls_state = state;
809 lsp->ls_owner.lo_type = type;
810 switch (lsp->ls_owner.lo_type) {
811 case NFS4_FLOCK_LOCK_TYPE:
812 lsp->ls_owner.lo_u.flock_owner = fl_pid;
814 case NFS4_POSIX_LOCK_TYPE:
815 lsp->ls_owner.lo_u.posix_owner = fl_owner;
821 spin_lock(&clp->cl_lock);
822 nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64);
823 spin_unlock(&clp->cl_lock);
824 INIT_LIST_HEAD(&lsp->ls_locks);
828 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
830 struct nfs_server *server = lsp->ls_state->owner->so_server;
831 struct nfs_client *clp = server->nfs_client;
833 spin_lock(&clp->cl_lock);
834 nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id);
835 spin_unlock(&clp->cl_lock);
836 rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
841 * Return a compatible lock_state. If no initialized lock_state structure
842 * exists, return an uninitialized one.
845 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
847 struct nfs4_lock_state *lsp, *new = NULL;
850 spin_lock(&state->state_lock);
851 lsp = __nfs4_find_lock_state(state, owner, pid, type);
855 list_add(&new->ls_locks, &state->lock_states);
856 set_bit(LK_STATE_IN_USE, &state->flags);
861 spin_unlock(&state->state_lock);
862 new = nfs4_alloc_lock_state(state, owner, pid, type);
866 spin_unlock(&state->state_lock);
868 nfs4_free_lock_state(new);
873 * Release reference to lock_state, and free it if we see that
874 * it is no longer in use
876 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
878 struct nfs4_state *state;
882 state = lsp->ls_state;
883 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
885 list_del(&lsp->ls_locks);
886 if (list_empty(&state->lock_states))
887 clear_bit(LK_STATE_IN_USE, &state->flags);
888 spin_unlock(&state->state_lock);
889 if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
890 nfs4_release_lockowner(lsp);
891 nfs4_free_lock_state(lsp);
894 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
896 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
898 dst->fl_u.nfs4_fl.owner = lsp;
899 atomic_inc(&lsp->ls_count);
902 static void nfs4_fl_release_lock(struct file_lock *fl)
904 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
907 static const struct file_lock_operations nfs4_fl_lock_ops = {
908 .fl_copy_lock = nfs4_fl_copy_lock,
909 .fl_release_private = nfs4_fl_release_lock,
912 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
914 struct nfs4_lock_state *lsp;
916 if (fl->fl_ops != NULL)
918 if (fl->fl_flags & FL_POSIX)
919 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
920 else if (fl->fl_flags & FL_FLOCK)
921 lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
926 fl->fl_u.nfs4_fl.owner = lsp;
927 fl->fl_ops = &nfs4_fl_lock_ops;
932 * Byte-range lock aware utility to initialize the stateid of read/write
935 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
937 struct nfs4_lock_state *lsp;
941 seq = read_seqbegin(&state->seqlock);
942 memcpy(dst, &state->stateid, sizeof(*dst));
943 } while (read_seqretry(&state->seqlock, seq));
944 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
947 spin_lock(&state->state_lock);
948 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
949 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
950 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
951 spin_unlock(&state->state_lock);
952 nfs4_put_lock_state(lsp);
955 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
957 struct nfs_seqid *new;
959 new = kmalloc(sizeof(*new), gfp_mask);
961 new->sequence = counter;
962 INIT_LIST_HEAD(&new->list);
967 void nfs_release_seqid(struct nfs_seqid *seqid)
969 if (!list_empty(&seqid->list)) {
970 struct rpc_sequence *sequence = seqid->sequence->sequence;
972 spin_lock(&sequence->lock);
973 list_del_init(&seqid->list);
974 spin_unlock(&sequence->lock);
975 rpc_wake_up(&sequence->wait);
979 void nfs_free_seqid(struct nfs_seqid *seqid)
981 nfs_release_seqid(seqid);
986 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
987 * failed with a seqid incrementing error -
988 * see comments nfs_fs.h:seqid_mutating_error()
990 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
992 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
996 case -NFS4ERR_BAD_SEQID:
997 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
999 printk(KERN_WARNING "NFS: v4 server returned a bad"
1000 " sequence-id error on an"
1001 " unconfirmed sequence %p!\n",
1003 case -NFS4ERR_STALE_CLIENTID:
1004 case -NFS4ERR_STALE_STATEID:
1005 case -NFS4ERR_BAD_STATEID:
1006 case -NFS4ERR_BADXDR:
1007 case -NFS4ERR_RESOURCE:
1008 case -NFS4ERR_NOFILEHANDLE:
1009 /* Non-seqid mutating errors */
1013 * Note: no locking needed as we are guaranteed to be first
1014 * on the sequence list
1016 seqid->sequence->counter++;
1019 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1021 struct nfs4_state_owner *sp = container_of(seqid->sequence,
1022 struct nfs4_state_owner, so_seqid);
1023 struct nfs_server *server = sp->so_server;
1025 if (status == -NFS4ERR_BAD_SEQID)
1026 nfs4_drop_state_owner(sp);
1027 if (!nfs4_has_session(server->nfs_client))
1028 nfs_increment_seqid(status, seqid);
1032 * Increment the seqid if the LOCK/LOCKU succeeded, or
1033 * failed with a seqid incrementing error -
1034 * see comments nfs_fs.h:seqid_mutating_error()
1036 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1038 nfs_increment_seqid(status, seqid);
1041 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1043 struct rpc_sequence *sequence = seqid->sequence->sequence;
1046 spin_lock(&sequence->lock);
1047 if (list_empty(&seqid->list))
1048 list_add_tail(&seqid->list, &sequence->list);
1049 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1051 rpc_sleep_on(&sequence->wait, task, NULL);
1054 spin_unlock(&sequence->lock);
1058 static int nfs4_run_state_manager(void *);
1060 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1062 smp_mb__before_clear_bit();
1063 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1064 smp_mb__after_clear_bit();
1065 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1066 rpc_wake_up(&clp->cl_rpcwaitq);
1070 * Schedule the nfs_client asynchronous state management routine
1072 void nfs4_schedule_state_manager(struct nfs_client *clp)
1074 struct task_struct *task;
1076 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1078 __module_get(THIS_MODULE);
1079 atomic_inc(&clp->cl_count);
1080 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
1081 rpc_peeraddr2str(clp->cl_rpcclient,
1085 nfs4_clear_state_manager_bit(clp);
1086 nfs_put_client(clp);
1087 module_put(THIS_MODULE);
1091 * Schedule a lease recovery attempt
1093 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1097 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1098 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1099 nfs4_schedule_state_manager(clp);
1102 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1104 nfs_handle_cb_pathdown(clp);
1105 nfs4_schedule_state_manager(clp);
1108 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1111 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1112 /* Don't recover state that expired before the reboot */
1113 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1114 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1117 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1118 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1122 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1124 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1125 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1126 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1127 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1131 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1133 struct nfs_client *clp = server->nfs_client;
1135 nfs4_state_mark_reclaim_nograce(clp, state);
1136 nfs4_schedule_state_manager(clp);
1139 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1141 struct inode *inode = state->inode;
1142 struct nfs_inode *nfsi = NFS_I(inode);
1143 struct file_lock *fl;
1146 if (inode->i_flock == NULL)
1149 /* Guard against delegation returns and new lock/unlock calls */
1150 down_write(&nfsi->rwsem);
1151 /* Protect inode->i_flock using the BKL */
1153 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1154 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1156 if (nfs_file_open_context(fl->fl_file)->state != state)
1159 status = ops->recover_lock(state, fl);
1164 case -NFS4ERR_ADMIN_REVOKED:
1165 case -NFS4ERR_STALE_STATEID:
1166 case -NFS4ERR_BAD_STATEID:
1167 case -NFS4ERR_EXPIRED:
1168 case -NFS4ERR_NO_GRACE:
1169 case -NFS4ERR_STALE_CLIENTID:
1170 case -NFS4ERR_BADSESSION:
1171 case -NFS4ERR_BADSLOT:
1172 case -NFS4ERR_BAD_HIGH_SLOT:
1173 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1176 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1179 case -NFS4ERR_DENIED:
1180 case -NFS4ERR_RECLAIM_BAD:
1181 case -NFS4ERR_RECLAIM_CONFLICT:
1182 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1189 up_write(&nfsi->rwsem);
1193 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1195 struct nfs4_state *state;
1196 struct nfs4_lock_state *lock;
1199 /* Note: we rely on the sp->so_states list being ordered
1200 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1202 * This is needed to ensure that the server won't give us any
1203 * read delegations that we have to return if, say, we are
1204 * recovering after a network partition or a reboot from a
1205 * server that doesn't support a grace period.
1208 spin_lock(&sp->so_lock);
1209 list_for_each_entry(state, &sp->so_states, open_states) {
1210 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1212 if (state->state == 0)
1214 atomic_inc(&state->count);
1215 spin_unlock(&sp->so_lock);
1216 status = ops->recover_open(sp, state);
1218 status = nfs4_reclaim_locks(state, ops);
1220 spin_lock(&state->state_lock);
1221 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1222 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1223 printk("%s: Lock reclaim failed!\n",
1226 spin_unlock(&state->state_lock);
1227 nfs4_put_open_state(state);
1233 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1239 * Open state on this file cannot be recovered
1240 * All we can do is revert to using the zero stateid.
1242 memset(state->stateid.data, 0,
1243 sizeof(state->stateid.data));
1244 /* Mark the file as being 'closed' */
1249 * User RPCSEC_GSS context has expired.
1250 * We cannot recover this stateid now, so
1251 * skip it and allow recovery thread to
1255 case -NFS4ERR_ADMIN_REVOKED:
1256 case -NFS4ERR_STALE_STATEID:
1257 case -NFS4ERR_BAD_STATEID:
1258 case -NFS4ERR_RECLAIM_BAD:
1259 case -NFS4ERR_RECLAIM_CONFLICT:
1260 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1262 case -NFS4ERR_EXPIRED:
1263 case -NFS4ERR_NO_GRACE:
1264 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1265 case -NFS4ERR_STALE_CLIENTID:
1266 case -NFS4ERR_BADSESSION:
1267 case -NFS4ERR_BADSLOT:
1268 case -NFS4ERR_BAD_HIGH_SLOT:
1269 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1272 nfs4_put_open_state(state);
1275 spin_unlock(&sp->so_lock);
1278 nfs4_put_open_state(state);
1282 static void nfs4_clear_open_state(struct nfs4_state *state)
1284 struct nfs4_lock_state *lock;
1286 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1287 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1288 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1289 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1290 spin_lock(&state->state_lock);
1291 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1292 lock->ls_seqid.flags = 0;
1293 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1295 spin_unlock(&state->state_lock);
1298 static void nfs4_reset_seqids(struct nfs_server *server,
1299 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1301 struct nfs_client *clp = server->nfs_client;
1302 struct nfs4_state_owner *sp;
1303 struct rb_node *pos;
1304 struct nfs4_state *state;
1306 spin_lock(&clp->cl_lock);
1307 for (pos = rb_first(&server->state_owners);
1309 pos = rb_next(pos)) {
1310 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1311 sp->so_seqid.flags = 0;
1312 spin_lock(&sp->so_lock);
1313 list_for_each_entry(state, &sp->so_states, open_states) {
1314 if (mark_reclaim(clp, state))
1315 nfs4_clear_open_state(state);
1317 spin_unlock(&sp->so_lock);
1319 spin_unlock(&clp->cl_lock);
1322 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1323 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1325 struct nfs_server *server;
1328 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1329 nfs4_reset_seqids(server, mark_reclaim);
1333 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1335 /* Mark all delegations for reclaim */
1336 nfs_delegation_mark_reclaim(clp);
1337 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1340 static void nfs4_reclaim_complete(struct nfs_client *clp,
1341 const struct nfs4_state_recovery_ops *ops)
1343 /* Notify the server we're done reclaiming our state */
1344 if (ops->reclaim_complete)
1345 (void)ops->reclaim_complete(clp);
1348 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1350 struct nfs_client *clp = server->nfs_client;
1351 struct nfs4_state_owner *sp;
1352 struct rb_node *pos;
1353 struct nfs4_state *state;
1355 spin_lock(&clp->cl_lock);
1356 for (pos = rb_first(&server->state_owners);
1358 pos = rb_next(pos)) {
1359 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1360 spin_lock(&sp->so_lock);
1361 list_for_each_entry(state, &sp->so_states, open_states) {
1362 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1365 nfs4_state_mark_reclaim_nograce(clp, state);
1367 spin_unlock(&sp->so_lock);
1369 spin_unlock(&clp->cl_lock);
1372 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1374 struct nfs_server *server;
1376 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1380 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1381 nfs4_clear_reclaim_server(server);
1384 nfs_delegation_reap_unclaimed(clp);
1388 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1390 if (!nfs4_state_clear_reclaim_reboot(clp))
1392 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1395 static void nfs_delegation_clear_all(struct nfs_client *clp)
1397 nfs_delegation_mark_reclaim(clp);
1398 nfs_delegation_reap_unclaimed(clp);
1401 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1403 nfs_delegation_clear_all(clp);
1404 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1407 static void nfs4_warn_keyexpired(const char *s)
1409 printk_ratelimited(KERN_WARNING "Error: state manager"
1410 " encountered RPCSEC_GSS session"
1411 " expired against NFSv4 server %s.\n",
1415 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1420 case -NFS4ERR_CB_PATH_DOWN:
1421 nfs_handle_cb_pathdown(clp);
1423 case -NFS4ERR_NO_GRACE:
1424 nfs4_state_end_reclaim_reboot(clp);
1426 case -NFS4ERR_STALE_CLIENTID:
1427 case -NFS4ERR_LEASE_MOVED:
1428 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1429 nfs4_state_clear_reclaim_reboot(clp);
1430 nfs4_state_start_reclaim_reboot(clp);
1432 case -NFS4ERR_EXPIRED:
1433 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1434 nfs4_state_start_reclaim_nograce(clp);
1436 case -NFS4ERR_BADSESSION:
1437 case -NFS4ERR_BADSLOT:
1438 case -NFS4ERR_BAD_HIGH_SLOT:
1439 case -NFS4ERR_DEADSESSION:
1440 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1441 case -NFS4ERR_SEQ_FALSE_RETRY:
1442 case -NFS4ERR_SEQ_MISORDERED:
1443 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1444 /* Zero session reset errors */
1447 /* Nothing we can do */
1448 nfs4_warn_keyexpired(clp->cl_hostname);
1456 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1458 struct nfs4_state_owner *sp;
1459 struct nfs_server *server;
1460 struct rb_node *pos;
1465 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1466 nfs4_purge_state_owners(server);
1467 spin_lock(&clp->cl_lock);
1468 for (pos = rb_first(&server->state_owners);
1470 pos = rb_next(pos)) {
1472 struct nfs4_state_owner, so_server_node);
1473 if (!test_and_clear_bit(ops->owner_flag_bit,
1476 atomic_inc(&sp->so_count);
1477 spin_unlock(&clp->cl_lock);
1480 status = nfs4_reclaim_open_state(sp, ops);
1482 set_bit(ops->owner_flag_bit, &sp->so_flags);
1483 nfs4_put_state_owner(sp);
1484 return nfs4_recovery_handle_error(clp, status);
1487 nfs4_put_state_owner(sp);
1490 spin_unlock(&clp->cl_lock);
1496 static int nfs4_check_lease(struct nfs_client *clp)
1498 struct rpc_cred *cred;
1499 const struct nfs4_state_maintenance_ops *ops =
1500 clp->cl_mvops->state_renewal_ops;
1503 /* Is the client already known to have an expired lease? */
1504 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1506 spin_lock(&clp->cl_lock);
1507 cred = ops->get_state_renewal_cred_locked(clp);
1508 spin_unlock(&clp->cl_lock);
1510 cred = nfs4_get_setclientid_cred(clp);
1515 status = ops->renew_lease(clp, cred);
1518 return nfs4_recovery_handle_error(clp, status);
1521 static int nfs4_reclaim_lease(struct nfs_client *clp)
1523 struct rpc_cred *cred;
1524 const struct nfs4_state_recovery_ops *ops =
1525 clp->cl_mvops->reboot_recovery_ops;
1526 int status = -ENOENT;
1528 cred = ops->get_clid_cred(clp);
1530 status = ops->establish_clid(clp, cred);
1532 /* Handle case where the user hasn't set up machine creds */
1533 if (status == -EACCES && cred == clp->cl_machine_cred) {
1534 nfs4_clear_machine_cred(clp);
1537 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1538 status = -EPROTONOSUPPORT;
1543 #ifdef CONFIG_NFS_V4_1
1544 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1546 struct nfs_client *clp = session->clp;
1548 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1549 nfs4_schedule_lease_recovery(clp);
1551 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1553 void nfs41_handle_recall_slot(struct nfs_client *clp)
1555 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1556 nfs4_schedule_state_manager(clp);
1559 static void nfs4_reset_all_state(struct nfs_client *clp)
1561 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1562 clp->cl_boot_time = CURRENT_TIME;
1563 nfs4_state_start_reclaim_nograce(clp);
1564 nfs4_schedule_state_manager(clp);
1568 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1570 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1571 nfs4_state_start_reclaim_reboot(clp);
1572 nfs4_schedule_state_manager(clp);
1576 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1579 nfs4_reset_all_state(clp);
1582 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1584 /* This will need to handle layouts too */
1585 nfs_expire_all_delegations(clp);
1588 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1590 nfs_expire_all_delegations(clp);
1591 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1592 nfs4_schedule_state_manager(clp);
1595 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1599 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1600 nfs41_handle_server_reboot(clp);
1601 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1602 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1603 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1604 SEQ4_STATUS_LEASE_MOVED))
1605 nfs41_handle_state_revoked(clp);
1606 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1607 nfs41_handle_recallable_state_revoked(clp);
1608 if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1609 SEQ4_STATUS_BACKCHANNEL_FAULT |
1610 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1611 nfs41_handle_cb_path_down(clp);
1614 static int nfs4_reset_session(struct nfs_client *clp)
1618 nfs4_begin_drain_session(clp);
1619 status = nfs4_proc_destroy_session(clp->cl_session);
1620 if (status && status != -NFS4ERR_BADSESSION &&
1621 status != -NFS4ERR_DEADSESSION) {
1622 status = nfs4_recovery_handle_error(clp, status);
1626 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1627 status = nfs4_proc_create_session(clp);
1629 status = nfs4_recovery_handle_error(clp, status);
1632 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1633 /* create_session negotiated new slot table */
1634 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1636 /* Let the state manager reestablish state */
1637 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1638 nfs41_setup_state_renewal(clp);
1643 static int nfs4_recall_slot(struct nfs_client *clp)
1645 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1646 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1647 struct nfs4_slot *new, *old;
1650 nfs4_begin_drain_session(clp);
1651 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1656 spin_lock(&fc_tbl->slot_tbl_lock);
1657 for (i = 0; i < fc_tbl->target_max_slots; i++)
1658 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1659 old = fc_tbl->slots;
1660 fc_tbl->slots = new;
1661 fc_tbl->max_slots = fc_tbl->target_max_slots;
1662 fc_tbl->target_max_slots = 0;
1663 fc_attrs->max_reqs = fc_tbl->max_slots;
1664 spin_unlock(&fc_tbl->slot_tbl_lock);
1667 nfs4_end_drain_session(clp);
1671 #else /* CONFIG_NFS_V4_1 */
1672 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1673 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1674 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1675 #endif /* CONFIG_NFS_V4_1 */
1677 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1678 * on EXCHANGE_ID for v4.1
1680 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1683 case -NFS4ERR_CLID_INUSE:
1684 case -NFS4ERR_STALE_CLIENTID:
1685 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1687 case -NFS4ERR_DELAY:
1694 nfs4_warn_keyexpired(clp->cl_hostname);
1695 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1696 * in nfs4_exchange_id */
1700 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1703 static void nfs4_state_manager(struct nfs_client *clp)
1707 /* Ensure exclusive access to NFSv4 state */
1709 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1710 /* We're going to have to re-establish a clientid */
1711 status = nfs4_reclaim_lease(clp);
1713 nfs4_set_lease_expired(clp, status);
1714 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1717 if (clp->cl_cons_state ==
1718 NFS_CS_SESSION_INITING)
1719 nfs_mark_client_ready(clp, status);
1722 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1724 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1726 nfs4_state_start_reclaim_nograce(clp);
1728 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1731 pnfs_destroy_all_layouts(clp);
1734 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1735 status = nfs4_check_lease(clp);
1738 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1742 /* Initialize or reset the session */
1743 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1744 && nfs4_has_session(clp)) {
1745 status = nfs4_reset_session(clp);
1746 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1752 /* First recover reboot state... */
1753 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1754 status = nfs4_do_reclaim(clp,
1755 clp->cl_mvops->reboot_recovery_ops);
1756 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1757 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1759 nfs4_state_end_reclaim_reboot(clp);
1760 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1766 /* Now recover expired state... */
1767 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1768 status = nfs4_do_reclaim(clp,
1769 clp->cl_mvops->nograce_recovery_ops);
1770 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1771 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1772 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1778 nfs4_end_drain_session(clp);
1779 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1780 nfs_client_return_marked_delegations(clp);
1783 /* Recall session slots */
1784 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1785 && nfs4_has_session(clp)) {
1786 status = nfs4_recall_slot(clp);
1793 nfs4_clear_state_manager_bit(clp);
1794 /* Did we race with an attempt to give us more work? */
1795 if (clp->cl_state == 0)
1797 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1799 } while (atomic_read(&clp->cl_count) > 1);
1802 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1803 " with error %d\n", clp->cl_hostname, -status);
1804 nfs4_end_drain_session(clp);
1805 nfs4_clear_state_manager_bit(clp);
1808 static int nfs4_run_state_manager(void *ptr)
1810 struct nfs_client *clp = ptr;
1812 allow_signal(SIGKILL);
1813 nfs4_state_manager(clp);
1814 nfs_put_client(clp);
1815 module_put_and_exit(0);