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 struct nfs4_state_owner *
321 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
323 struct rb_node **p = &server->state_owners.rb_node,
325 struct nfs4_state_owner *sp;
329 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
331 if (cred < sp->so_cred)
332 p = &parent->rb_left;
333 else if (cred > sp->so_cred)
334 p = &parent->rb_right;
336 if (!list_empty(&sp->so_lru))
337 list_del_init(&sp->so_lru);
338 atomic_inc(&sp->so_count);
345 static struct nfs4_state_owner *
346 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
348 struct nfs_server *server = new->so_server;
349 struct rb_node **p = &server->state_owners.rb_node,
351 struct nfs4_state_owner *sp;
356 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
358 if (new->so_cred < sp->so_cred)
359 p = &parent->rb_left;
360 else if (new->so_cred > sp->so_cred)
361 p = &parent->rb_right;
363 if (!list_empty(&sp->so_lru))
364 list_del_init(&sp->so_lru);
365 atomic_inc(&sp->so_count);
369 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
372 rb_link_node(&new->so_server_node, parent, p);
373 rb_insert_color(&new->so_server_node, &server->state_owners);
378 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
380 struct nfs_server *server = sp->so_server;
382 if (!RB_EMPTY_NODE(&sp->so_server_node))
383 rb_erase(&sp->so_server_node, &server->state_owners);
384 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
388 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
392 spin_lock_init(&sc->lock);
393 INIT_LIST_HEAD(&sc->list);
394 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
398 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
400 rpc_destroy_wait_queue(&sc->wait);
404 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
405 * create a new state_owner.
408 static struct nfs4_state_owner *
409 nfs4_alloc_state_owner(struct nfs_server *server,
410 struct rpc_cred *cred,
413 struct nfs4_state_owner *sp;
415 sp = kzalloc(sizeof(*sp), gfp_flags);
418 sp->so_server = server;
419 sp->so_cred = get_rpccred(cred);
420 spin_lock_init(&sp->so_lock);
421 INIT_LIST_HEAD(&sp->so_states);
422 nfs4_init_seqid_counter(&sp->so_seqid);
423 atomic_set(&sp->so_count, 1);
424 INIT_LIST_HEAD(&sp->so_lru);
429 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
431 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
432 struct nfs_server *server = sp->so_server;
433 struct nfs_client *clp = server->nfs_client;
435 spin_lock(&clp->cl_lock);
436 rb_erase(&sp->so_server_node, &server->state_owners);
437 RB_CLEAR_NODE(&sp->so_server_node);
438 spin_unlock(&clp->cl_lock);
442 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
444 nfs4_destroy_seqid_counter(&sp->so_seqid);
445 put_rpccred(sp->so_cred);
449 static void nfs4_gc_state_owners(struct nfs_server *server)
451 struct nfs_client *clp = server->nfs_client;
452 struct nfs4_state_owner *sp, *tmp;
453 unsigned long time_min, time_max;
456 spin_lock(&clp->cl_lock);
458 time_min = (long)time_max - (long)clp->cl_lease_time;
459 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
460 /* NB: LRU is sorted so that oldest is at the head */
461 if (time_in_range(sp->so_expires, time_min, time_max))
463 list_move(&sp->so_lru, &doomed);
464 nfs4_remove_state_owner_locked(sp);
466 spin_unlock(&clp->cl_lock);
468 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
469 list_del(&sp->so_lru);
470 nfs4_free_state_owner(sp);
475 * nfs4_get_state_owner - Look up a state owner given a credential
476 * @server: nfs_server to search
477 * @cred: RPC credential to match
479 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
481 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
482 struct rpc_cred *cred,
485 struct nfs_client *clp = server->nfs_client;
486 struct nfs4_state_owner *sp, *new;
488 spin_lock(&clp->cl_lock);
489 sp = nfs4_find_state_owner_locked(server, cred);
490 spin_unlock(&clp->cl_lock);
493 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
497 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
499 spin_lock(&clp->cl_lock);
500 sp = nfs4_insert_state_owner_locked(new);
501 spin_unlock(&clp->cl_lock);
502 } while (sp == ERR_PTR(-EAGAIN));
504 nfs4_free_state_owner(new);
506 nfs4_gc_state_owners(server);
511 * nfs4_put_state_owner - Release a nfs4_state_owner
512 * @sp: state owner data to release
514 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
516 struct nfs_server *server = sp->so_server;
517 struct nfs_client *clp = server->nfs_client;
519 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
522 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
523 sp->so_expires = jiffies;
524 list_add_tail(&sp->so_lru, &server->state_owners_lru);
525 spin_unlock(&clp->cl_lock);
527 nfs4_remove_state_owner_locked(sp);
528 spin_unlock(&clp->cl_lock);
529 nfs4_free_state_owner(sp);
534 * nfs4_purge_state_owners - Release all cached state owners
535 * @server: nfs_server with cached state owners to release
537 * Called at umount time. Remaining state owners will be on
538 * the LRU with ref count of zero.
540 void nfs4_purge_state_owners(struct nfs_server *server)
542 struct nfs_client *clp = server->nfs_client;
543 struct nfs4_state_owner *sp, *tmp;
546 spin_lock(&clp->cl_lock);
547 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
548 list_move(&sp->so_lru, &doomed);
549 nfs4_remove_state_owner_locked(sp);
551 spin_unlock(&clp->cl_lock);
553 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
554 list_del(&sp->so_lru);
555 nfs4_free_state_owner(sp);
559 static struct nfs4_state *
560 nfs4_alloc_open_state(void)
562 struct nfs4_state *state;
564 state = kzalloc(sizeof(*state), GFP_NOFS);
567 atomic_set(&state->count, 1);
568 INIT_LIST_HEAD(&state->lock_states);
569 spin_lock_init(&state->state_lock);
570 seqlock_init(&state->seqlock);
575 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
577 if (state->state == fmode)
579 /* NB! List reordering - see the reclaim code for why. */
580 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
581 if (fmode & FMODE_WRITE)
582 list_move(&state->open_states, &state->owner->so_states);
584 list_move_tail(&state->open_states, &state->owner->so_states);
586 state->state = fmode;
589 static struct nfs4_state *
590 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
592 struct nfs_inode *nfsi = NFS_I(inode);
593 struct nfs4_state *state;
595 list_for_each_entry(state, &nfsi->open_states, inode_states) {
596 if (state->owner != owner)
598 if (atomic_inc_not_zero(&state->count))
605 nfs4_free_open_state(struct nfs4_state *state)
611 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
613 struct nfs4_state *state, *new;
614 struct nfs_inode *nfsi = NFS_I(inode);
616 spin_lock(&inode->i_lock);
617 state = __nfs4_find_state_byowner(inode, owner);
618 spin_unlock(&inode->i_lock);
621 new = nfs4_alloc_open_state();
622 spin_lock(&owner->so_lock);
623 spin_lock(&inode->i_lock);
624 state = __nfs4_find_state_byowner(inode, owner);
625 if (state == NULL && new != NULL) {
627 state->owner = owner;
628 atomic_inc(&owner->so_count);
629 list_add(&state->inode_states, &nfsi->open_states);
631 state->inode = inode;
632 spin_unlock(&inode->i_lock);
633 /* Note: The reclaim code dictates that we add stateless
634 * and read-only stateids to the end of the list */
635 list_add_tail(&state->open_states, &owner->so_states);
636 spin_unlock(&owner->so_lock);
638 spin_unlock(&inode->i_lock);
639 spin_unlock(&owner->so_lock);
641 nfs4_free_open_state(new);
647 void nfs4_put_open_state(struct nfs4_state *state)
649 struct inode *inode = state->inode;
650 struct nfs4_state_owner *owner = state->owner;
652 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
654 spin_lock(&inode->i_lock);
655 list_del(&state->inode_states);
656 list_del(&state->open_states);
657 spin_unlock(&inode->i_lock);
658 spin_unlock(&owner->so_lock);
660 nfs4_free_open_state(state);
661 nfs4_put_state_owner(owner);
665 * Close the current file.
667 static void __nfs4_close(struct nfs4_state *state,
668 fmode_t fmode, gfp_t gfp_mask, int wait)
670 struct nfs4_state_owner *owner = state->owner;
674 atomic_inc(&owner->so_count);
675 /* Protect against nfs4_find_state() */
676 spin_lock(&owner->so_lock);
677 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
684 case FMODE_READ|FMODE_WRITE:
687 newstate = FMODE_READ|FMODE_WRITE;
688 if (state->n_rdwr == 0) {
689 if (state->n_rdonly == 0) {
690 newstate &= ~FMODE_READ;
691 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
692 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
694 if (state->n_wronly == 0) {
695 newstate &= ~FMODE_WRITE;
696 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
697 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
700 clear_bit(NFS_DELEGATED_STATE, &state->flags);
702 nfs4_state_set_mode_locked(state, newstate);
703 spin_unlock(&owner->so_lock);
706 nfs4_put_open_state(state);
707 nfs4_put_state_owner(owner);
709 bool roc = pnfs_roc(state->inode);
711 nfs4_do_close(state, gfp_mask, wait, roc);
715 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
717 __nfs4_close(state, fmode, GFP_NOFS, 0);
720 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
722 __nfs4_close(state, fmode, GFP_KERNEL, 1);
726 * Search the state->lock_states for an existing lock_owner
727 * that is compatible with current->files
729 static struct nfs4_lock_state *
730 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
732 struct nfs4_lock_state *pos;
733 list_for_each_entry(pos, &state->lock_states, ls_locks) {
734 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
736 switch (pos->ls_owner.lo_type) {
737 case NFS4_POSIX_LOCK_TYPE:
738 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
741 case NFS4_FLOCK_LOCK_TYPE:
742 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
745 atomic_inc(&pos->ls_count);
752 * Return a compatible lock_state. If no initialized lock_state structure
753 * exists, return an uninitialized one.
756 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)
758 struct nfs4_lock_state *lsp;
759 struct nfs_server *server = state->owner->so_server;
761 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
764 nfs4_init_seqid_counter(&lsp->ls_seqid);
765 atomic_set(&lsp->ls_count, 1);
766 lsp->ls_state = state;
767 lsp->ls_owner.lo_type = type;
768 switch (lsp->ls_owner.lo_type) {
769 case NFS4_FLOCK_LOCK_TYPE:
770 lsp->ls_owner.lo_u.flock_owner = fl_pid;
772 case NFS4_POSIX_LOCK_TYPE:
773 lsp->ls_owner.lo_u.posix_owner = fl_owner;
778 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
779 if (lsp->ls_seqid.owner_id < 0)
781 INIT_LIST_HEAD(&lsp->ls_locks);
788 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
790 struct nfs_server *server = lsp->ls_state->owner->so_server;
792 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
793 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
798 * Return a compatible lock_state. If no initialized lock_state structure
799 * exists, return an uninitialized one.
802 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
804 struct nfs4_lock_state *lsp, *new = NULL;
807 spin_lock(&state->state_lock);
808 lsp = __nfs4_find_lock_state(state, owner, pid, type);
812 list_add(&new->ls_locks, &state->lock_states);
813 set_bit(LK_STATE_IN_USE, &state->flags);
818 spin_unlock(&state->state_lock);
819 new = nfs4_alloc_lock_state(state, owner, pid, type);
823 spin_unlock(&state->state_lock);
825 nfs4_free_lock_state(new);
830 * Release reference to lock_state, and free it if we see that
831 * it is no longer in use
833 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
835 struct nfs4_state *state;
839 state = lsp->ls_state;
840 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
842 list_del(&lsp->ls_locks);
843 if (list_empty(&state->lock_states))
844 clear_bit(LK_STATE_IN_USE, &state->flags);
845 spin_unlock(&state->state_lock);
846 if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
847 nfs4_release_lockowner(lsp);
848 nfs4_free_lock_state(lsp);
851 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
853 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
855 dst->fl_u.nfs4_fl.owner = lsp;
856 atomic_inc(&lsp->ls_count);
859 static void nfs4_fl_release_lock(struct file_lock *fl)
861 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
864 static const struct file_lock_operations nfs4_fl_lock_ops = {
865 .fl_copy_lock = nfs4_fl_copy_lock,
866 .fl_release_private = nfs4_fl_release_lock,
869 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
871 struct nfs4_lock_state *lsp;
873 if (fl->fl_ops != NULL)
875 if (fl->fl_flags & FL_POSIX)
876 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
877 else if (fl->fl_flags & FL_FLOCK)
878 lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
883 fl->fl_u.nfs4_fl.owner = lsp;
884 fl->fl_ops = &nfs4_fl_lock_ops;
889 * Byte-range lock aware utility to initialize the stateid of read/write
892 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
894 struct nfs4_lock_state *lsp;
898 seq = read_seqbegin(&state->seqlock);
899 memcpy(dst, &state->stateid, sizeof(*dst));
900 } while (read_seqretry(&state->seqlock, seq));
901 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
904 spin_lock(&state->state_lock);
905 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
906 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
907 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
908 spin_unlock(&state->state_lock);
909 nfs4_put_lock_state(lsp);
912 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
914 struct nfs_seqid *new;
916 new = kmalloc(sizeof(*new), gfp_mask);
918 new->sequence = counter;
919 INIT_LIST_HEAD(&new->list);
924 void nfs_release_seqid(struct nfs_seqid *seqid)
926 if (!list_empty(&seqid->list)) {
927 struct nfs_seqid_counter *sequence = seqid->sequence;
929 spin_lock(&sequence->lock);
930 list_del_init(&seqid->list);
931 spin_unlock(&sequence->lock);
932 rpc_wake_up(&sequence->wait);
936 void nfs_free_seqid(struct nfs_seqid *seqid)
938 nfs_release_seqid(seqid);
943 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
944 * failed with a seqid incrementing error -
945 * see comments nfs_fs.h:seqid_mutating_error()
947 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
949 BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
953 case -NFS4ERR_BAD_SEQID:
954 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
956 printk(KERN_WARNING "NFS: v4 server returned a bad"
957 " sequence-id error on an"
958 " unconfirmed sequence %p!\n",
960 case -NFS4ERR_STALE_CLIENTID:
961 case -NFS4ERR_STALE_STATEID:
962 case -NFS4ERR_BAD_STATEID:
963 case -NFS4ERR_BADXDR:
964 case -NFS4ERR_RESOURCE:
965 case -NFS4ERR_NOFILEHANDLE:
966 /* Non-seqid mutating errors */
970 * Note: no locking needed as we are guaranteed to be first
971 * on the sequence list
973 seqid->sequence->counter++;
976 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
978 struct nfs4_state_owner *sp = container_of(seqid->sequence,
979 struct nfs4_state_owner, so_seqid);
980 struct nfs_server *server = sp->so_server;
982 if (status == -NFS4ERR_BAD_SEQID)
983 nfs4_drop_state_owner(sp);
984 if (!nfs4_has_session(server->nfs_client))
985 nfs_increment_seqid(status, seqid);
989 * Increment the seqid if the LOCK/LOCKU succeeded, or
990 * failed with a seqid incrementing error -
991 * see comments nfs_fs.h:seqid_mutating_error()
993 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
995 nfs_increment_seqid(status, seqid);
998 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1000 struct nfs_seqid_counter *sequence = seqid->sequence;
1003 spin_lock(&sequence->lock);
1004 if (list_empty(&seqid->list))
1005 list_add_tail(&seqid->list, &sequence->list);
1006 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1008 rpc_sleep_on(&sequence->wait, task, NULL);
1011 spin_unlock(&sequence->lock);
1015 static int nfs4_run_state_manager(void *);
1017 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1019 smp_mb__before_clear_bit();
1020 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1021 smp_mb__after_clear_bit();
1022 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1023 rpc_wake_up(&clp->cl_rpcwaitq);
1027 * Schedule the nfs_client asynchronous state management routine
1029 void nfs4_schedule_state_manager(struct nfs_client *clp)
1031 struct task_struct *task;
1033 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1035 __module_get(THIS_MODULE);
1036 atomic_inc(&clp->cl_count);
1037 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
1038 rpc_peeraddr2str(clp->cl_rpcclient,
1042 nfs4_clear_state_manager_bit(clp);
1043 nfs_put_client(clp);
1044 module_put(THIS_MODULE);
1048 * Schedule a lease recovery attempt
1050 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1054 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1055 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1056 nfs4_schedule_state_manager(clp);
1059 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1061 nfs_handle_cb_pathdown(clp);
1062 nfs4_schedule_state_manager(clp);
1065 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1068 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1069 /* Don't recover state that expired before the reboot */
1070 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1071 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1074 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1075 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1079 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1081 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1082 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1083 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1084 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1088 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1090 struct nfs_client *clp = server->nfs_client;
1092 nfs4_state_mark_reclaim_nograce(clp, state);
1093 nfs4_schedule_state_manager(clp);
1096 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1098 struct inode *inode = state->inode;
1099 struct nfs_inode *nfsi = NFS_I(inode);
1100 struct file_lock *fl;
1103 if (inode->i_flock == NULL)
1106 /* Guard against delegation returns and new lock/unlock calls */
1107 down_write(&nfsi->rwsem);
1108 /* Protect inode->i_flock using the BKL */
1110 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1111 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1113 if (nfs_file_open_context(fl->fl_file)->state != state)
1116 status = ops->recover_lock(state, fl);
1121 case -NFS4ERR_ADMIN_REVOKED:
1122 case -NFS4ERR_STALE_STATEID:
1123 case -NFS4ERR_BAD_STATEID:
1124 case -NFS4ERR_EXPIRED:
1125 case -NFS4ERR_NO_GRACE:
1126 case -NFS4ERR_STALE_CLIENTID:
1127 case -NFS4ERR_BADSESSION:
1128 case -NFS4ERR_BADSLOT:
1129 case -NFS4ERR_BAD_HIGH_SLOT:
1130 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1133 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1136 case -NFS4ERR_DENIED:
1137 case -NFS4ERR_RECLAIM_BAD:
1138 case -NFS4ERR_RECLAIM_CONFLICT:
1139 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1146 up_write(&nfsi->rwsem);
1150 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1152 struct nfs4_state *state;
1153 struct nfs4_lock_state *lock;
1156 /* Note: we rely on the sp->so_states list being ordered
1157 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1159 * This is needed to ensure that the server won't give us any
1160 * read delegations that we have to return if, say, we are
1161 * recovering after a network partition or a reboot from a
1162 * server that doesn't support a grace period.
1165 spin_lock(&sp->so_lock);
1166 list_for_each_entry(state, &sp->so_states, open_states) {
1167 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1169 if (state->state == 0)
1171 atomic_inc(&state->count);
1172 spin_unlock(&sp->so_lock);
1173 status = ops->recover_open(sp, state);
1175 status = nfs4_reclaim_locks(state, ops);
1177 spin_lock(&state->state_lock);
1178 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1179 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1180 printk("%s: Lock reclaim failed!\n",
1183 spin_unlock(&state->state_lock);
1184 nfs4_put_open_state(state);
1190 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1196 * Open state on this file cannot be recovered
1197 * All we can do is revert to using the zero stateid.
1199 memset(state->stateid.data, 0,
1200 sizeof(state->stateid.data));
1201 /* Mark the file as being 'closed' */
1206 * User RPCSEC_GSS context has expired.
1207 * We cannot recover this stateid now, so
1208 * skip it and allow recovery thread to
1212 case -NFS4ERR_ADMIN_REVOKED:
1213 case -NFS4ERR_STALE_STATEID:
1214 case -NFS4ERR_BAD_STATEID:
1215 case -NFS4ERR_RECLAIM_BAD:
1216 case -NFS4ERR_RECLAIM_CONFLICT:
1217 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1219 case -NFS4ERR_EXPIRED:
1220 case -NFS4ERR_NO_GRACE:
1221 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1222 case -NFS4ERR_STALE_CLIENTID:
1223 case -NFS4ERR_BADSESSION:
1224 case -NFS4ERR_BADSLOT:
1225 case -NFS4ERR_BAD_HIGH_SLOT:
1226 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1229 nfs4_put_open_state(state);
1232 spin_unlock(&sp->so_lock);
1235 nfs4_put_open_state(state);
1239 static void nfs4_clear_open_state(struct nfs4_state *state)
1241 struct nfs4_lock_state *lock;
1243 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1244 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1245 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1246 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1247 spin_lock(&state->state_lock);
1248 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1249 lock->ls_seqid.flags = 0;
1250 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1252 spin_unlock(&state->state_lock);
1255 static void nfs4_reset_seqids(struct nfs_server *server,
1256 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1258 struct nfs_client *clp = server->nfs_client;
1259 struct nfs4_state_owner *sp;
1260 struct rb_node *pos;
1261 struct nfs4_state *state;
1263 spin_lock(&clp->cl_lock);
1264 for (pos = rb_first(&server->state_owners);
1266 pos = rb_next(pos)) {
1267 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1268 sp->so_seqid.flags = 0;
1269 spin_lock(&sp->so_lock);
1270 list_for_each_entry(state, &sp->so_states, open_states) {
1271 if (mark_reclaim(clp, state))
1272 nfs4_clear_open_state(state);
1274 spin_unlock(&sp->so_lock);
1276 spin_unlock(&clp->cl_lock);
1279 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1280 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1282 struct nfs_server *server;
1285 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1286 nfs4_reset_seqids(server, mark_reclaim);
1290 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1292 /* Mark all delegations for reclaim */
1293 nfs_delegation_mark_reclaim(clp);
1294 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1297 static void nfs4_reclaim_complete(struct nfs_client *clp,
1298 const struct nfs4_state_recovery_ops *ops)
1300 /* Notify the server we're done reclaiming our state */
1301 if (ops->reclaim_complete)
1302 (void)ops->reclaim_complete(clp);
1305 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1307 struct nfs_client *clp = server->nfs_client;
1308 struct nfs4_state_owner *sp;
1309 struct rb_node *pos;
1310 struct nfs4_state *state;
1312 spin_lock(&clp->cl_lock);
1313 for (pos = rb_first(&server->state_owners);
1315 pos = rb_next(pos)) {
1316 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1317 spin_lock(&sp->so_lock);
1318 list_for_each_entry(state, &sp->so_states, open_states) {
1319 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1322 nfs4_state_mark_reclaim_nograce(clp, state);
1324 spin_unlock(&sp->so_lock);
1326 spin_unlock(&clp->cl_lock);
1329 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1331 struct nfs_server *server;
1333 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1337 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1338 nfs4_clear_reclaim_server(server);
1341 nfs_delegation_reap_unclaimed(clp);
1345 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1347 if (!nfs4_state_clear_reclaim_reboot(clp))
1349 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1352 static void nfs_delegation_clear_all(struct nfs_client *clp)
1354 nfs_delegation_mark_reclaim(clp);
1355 nfs_delegation_reap_unclaimed(clp);
1358 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1360 nfs_delegation_clear_all(clp);
1361 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1364 static void nfs4_warn_keyexpired(const char *s)
1366 printk_ratelimited(KERN_WARNING "Error: state manager"
1367 " encountered RPCSEC_GSS session"
1368 " expired against NFSv4 server %s.\n",
1372 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1377 case -NFS4ERR_CB_PATH_DOWN:
1378 nfs_handle_cb_pathdown(clp);
1380 case -NFS4ERR_NO_GRACE:
1381 nfs4_state_end_reclaim_reboot(clp);
1383 case -NFS4ERR_STALE_CLIENTID:
1384 case -NFS4ERR_LEASE_MOVED:
1385 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1386 nfs4_state_clear_reclaim_reboot(clp);
1387 nfs4_state_start_reclaim_reboot(clp);
1389 case -NFS4ERR_EXPIRED:
1390 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1391 nfs4_state_start_reclaim_nograce(clp);
1393 case -NFS4ERR_BADSESSION:
1394 case -NFS4ERR_BADSLOT:
1395 case -NFS4ERR_BAD_HIGH_SLOT:
1396 case -NFS4ERR_DEADSESSION:
1397 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1398 case -NFS4ERR_SEQ_FALSE_RETRY:
1399 case -NFS4ERR_SEQ_MISORDERED:
1400 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1401 /* Zero session reset errors */
1404 /* Nothing we can do */
1405 nfs4_warn_keyexpired(clp->cl_hostname);
1413 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1415 struct nfs4_state_owner *sp;
1416 struct nfs_server *server;
1417 struct rb_node *pos;
1422 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1423 nfs4_purge_state_owners(server);
1424 spin_lock(&clp->cl_lock);
1425 for (pos = rb_first(&server->state_owners);
1427 pos = rb_next(pos)) {
1429 struct nfs4_state_owner, so_server_node);
1430 if (!test_and_clear_bit(ops->owner_flag_bit,
1433 atomic_inc(&sp->so_count);
1434 spin_unlock(&clp->cl_lock);
1437 status = nfs4_reclaim_open_state(sp, ops);
1439 set_bit(ops->owner_flag_bit, &sp->so_flags);
1440 nfs4_put_state_owner(sp);
1441 return nfs4_recovery_handle_error(clp, status);
1444 nfs4_put_state_owner(sp);
1447 spin_unlock(&clp->cl_lock);
1453 static int nfs4_check_lease(struct nfs_client *clp)
1455 struct rpc_cred *cred;
1456 const struct nfs4_state_maintenance_ops *ops =
1457 clp->cl_mvops->state_renewal_ops;
1460 /* Is the client already known to have an expired lease? */
1461 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1463 spin_lock(&clp->cl_lock);
1464 cred = ops->get_state_renewal_cred_locked(clp);
1465 spin_unlock(&clp->cl_lock);
1467 cred = nfs4_get_setclientid_cred(clp);
1472 status = ops->renew_lease(clp, cred);
1475 return nfs4_recovery_handle_error(clp, status);
1478 static int nfs4_reclaim_lease(struct nfs_client *clp)
1480 struct rpc_cred *cred;
1481 const struct nfs4_state_recovery_ops *ops =
1482 clp->cl_mvops->reboot_recovery_ops;
1483 int status = -ENOENT;
1485 cred = ops->get_clid_cred(clp);
1487 status = ops->establish_clid(clp, cred);
1489 /* Handle case where the user hasn't set up machine creds */
1490 if (status == -EACCES && cred == clp->cl_machine_cred) {
1491 nfs4_clear_machine_cred(clp);
1494 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1495 status = -EPROTONOSUPPORT;
1500 #ifdef CONFIG_NFS_V4_1
1501 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1503 struct nfs_client *clp = session->clp;
1505 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1506 nfs4_schedule_lease_recovery(clp);
1508 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1510 void nfs41_handle_recall_slot(struct nfs_client *clp)
1512 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1513 nfs4_schedule_state_manager(clp);
1516 static void nfs4_reset_all_state(struct nfs_client *clp)
1518 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1519 clp->cl_boot_time = CURRENT_TIME;
1520 nfs4_state_start_reclaim_nograce(clp);
1521 nfs4_schedule_state_manager(clp);
1525 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1527 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1528 nfs4_state_start_reclaim_reboot(clp);
1529 nfs4_schedule_state_manager(clp);
1533 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1536 nfs4_reset_all_state(clp);
1539 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1541 /* This will need to handle layouts too */
1542 nfs_expire_all_delegations(clp);
1545 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1547 nfs_expire_all_delegations(clp);
1548 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1549 nfs4_schedule_state_manager(clp);
1552 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1556 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1557 nfs41_handle_server_reboot(clp);
1558 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1559 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1560 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1561 SEQ4_STATUS_LEASE_MOVED))
1562 nfs41_handle_state_revoked(clp);
1563 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1564 nfs41_handle_recallable_state_revoked(clp);
1565 if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1566 SEQ4_STATUS_BACKCHANNEL_FAULT |
1567 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1568 nfs41_handle_cb_path_down(clp);
1571 static int nfs4_reset_session(struct nfs_client *clp)
1575 nfs4_begin_drain_session(clp);
1576 status = nfs4_proc_destroy_session(clp->cl_session);
1577 if (status && status != -NFS4ERR_BADSESSION &&
1578 status != -NFS4ERR_DEADSESSION) {
1579 status = nfs4_recovery_handle_error(clp, status);
1583 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1584 status = nfs4_proc_create_session(clp);
1586 status = nfs4_recovery_handle_error(clp, status);
1589 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1590 /* create_session negotiated new slot table */
1591 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1593 /* Let the state manager reestablish state */
1594 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1595 nfs41_setup_state_renewal(clp);
1600 static int nfs4_recall_slot(struct nfs_client *clp)
1602 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1603 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1604 struct nfs4_slot *new, *old;
1607 nfs4_begin_drain_session(clp);
1608 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1613 spin_lock(&fc_tbl->slot_tbl_lock);
1614 for (i = 0; i < fc_tbl->target_max_slots; i++)
1615 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1616 old = fc_tbl->slots;
1617 fc_tbl->slots = new;
1618 fc_tbl->max_slots = fc_tbl->target_max_slots;
1619 fc_tbl->target_max_slots = 0;
1620 fc_attrs->max_reqs = fc_tbl->max_slots;
1621 spin_unlock(&fc_tbl->slot_tbl_lock);
1624 nfs4_end_drain_session(clp);
1628 #else /* CONFIG_NFS_V4_1 */
1629 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1630 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1631 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1632 #endif /* CONFIG_NFS_V4_1 */
1634 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1635 * on EXCHANGE_ID for v4.1
1637 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1640 case -NFS4ERR_CLID_INUSE:
1641 case -NFS4ERR_STALE_CLIENTID:
1642 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1644 case -NFS4ERR_DELAY:
1651 nfs4_warn_keyexpired(clp->cl_hostname);
1652 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1653 * in nfs4_exchange_id */
1657 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1660 static void nfs4_state_manager(struct nfs_client *clp)
1664 /* Ensure exclusive access to NFSv4 state */
1666 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1667 /* We're going to have to re-establish a clientid */
1668 status = nfs4_reclaim_lease(clp);
1670 nfs4_set_lease_expired(clp, status);
1671 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1674 if (clp->cl_cons_state ==
1675 NFS_CS_SESSION_INITING)
1676 nfs_mark_client_ready(clp, status);
1679 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1681 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1683 nfs4_state_start_reclaim_nograce(clp);
1685 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1688 pnfs_destroy_all_layouts(clp);
1691 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1692 status = nfs4_check_lease(clp);
1695 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1699 /* Initialize or reset the session */
1700 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1701 && nfs4_has_session(clp)) {
1702 status = nfs4_reset_session(clp);
1703 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1709 /* First recover reboot state... */
1710 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1711 status = nfs4_do_reclaim(clp,
1712 clp->cl_mvops->reboot_recovery_ops);
1713 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1714 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1716 nfs4_state_end_reclaim_reboot(clp);
1717 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1723 /* Now recover expired state... */
1724 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1725 status = nfs4_do_reclaim(clp,
1726 clp->cl_mvops->nograce_recovery_ops);
1727 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1728 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1729 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1735 nfs4_end_drain_session(clp);
1736 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1737 nfs_client_return_marked_delegations(clp);
1740 /* Recall session slots */
1741 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1742 && nfs4_has_session(clp)) {
1743 status = nfs4_recall_slot(clp);
1750 nfs4_clear_state_manager_bit(clp);
1751 /* Did we race with an attempt to give us more work? */
1752 if (clp->cl_state == 0)
1754 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1756 } while (atomic_read(&clp->cl_count) > 1);
1759 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1760 " with error %d\n", clp->cl_hostname, -status);
1761 nfs4_end_drain_session(clp);
1762 nfs4_clear_state_manager_bit(clp);
1765 static int nfs4_run_state_manager(void *ptr)
1767 struct nfs_client *clp = ptr;
1769 allow_signal(SIGKILL);
1770 nfs4_state_manager(clp);
1771 nfs_put_client(clp);
1772 module_put_and_exit(0);