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(struct nfs_server *server,
448 struct rpc_cred *cred,
451 struct nfs4_state_owner *sp;
453 sp = kzalloc(sizeof(*sp), gfp_flags);
456 sp->so_server = server;
457 sp->so_cred = get_rpccred(cred);
458 spin_lock_init(&sp->so_lock);
459 INIT_LIST_HEAD(&sp->so_states);
460 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
461 sp->so_seqid.sequence = &sp->so_sequence;
462 spin_lock_init(&sp->so_sequence.lock);
463 INIT_LIST_HEAD(&sp->so_sequence.list);
464 atomic_set(&sp->so_count, 1);
465 INIT_LIST_HEAD(&sp->so_lru);
470 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
472 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
473 struct nfs_server *server = sp->so_server;
474 struct nfs_client *clp = server->nfs_client;
476 spin_lock(&clp->cl_lock);
477 rb_erase(&sp->so_server_node, &server->state_owners);
478 RB_CLEAR_NODE(&sp->so_server_node);
479 spin_unlock(&clp->cl_lock);
483 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
485 rpc_destroy_wait_queue(&sp->so_sequence.wait);
486 put_rpccred(sp->so_cred);
490 static void nfs4_gc_state_owners(struct nfs_server *server)
492 struct nfs_client *clp = server->nfs_client;
493 struct nfs4_state_owner *sp, *tmp;
494 unsigned long time_min, time_max;
497 spin_lock(&clp->cl_lock);
499 time_min = (long)time_max - (long)clp->cl_lease_time;
500 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
501 /* NB: LRU is sorted so that oldest is at the head */
502 if (time_in_range(sp->so_expires, time_min, time_max))
504 list_move(&sp->so_lru, &doomed);
505 nfs4_remove_state_owner_locked(sp);
507 spin_unlock(&clp->cl_lock);
509 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
510 list_del(&sp->so_lru);
511 nfs4_free_state_owner(sp);
516 * nfs4_get_state_owner - Look up a state owner given a credential
517 * @server: nfs_server to search
518 * @cred: RPC credential to match
520 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
522 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
523 struct rpc_cred *cred,
526 struct nfs_client *clp = server->nfs_client;
527 struct nfs4_state_owner *sp, *new;
529 spin_lock(&clp->cl_lock);
530 sp = nfs4_find_state_owner_locked(server, cred);
531 spin_unlock(&clp->cl_lock);
534 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
537 sp = nfs4_insert_state_owner_locked(new);
538 spin_unlock(&clp->cl_lock);
540 nfs4_free_state_owner(new);
542 nfs4_gc_state_owners(server);
547 * nfs4_put_state_owner - Release a nfs4_state_owner
548 * @sp: state owner data to release
550 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
552 struct nfs_server *server = sp->so_server;
553 struct nfs_client *clp = server->nfs_client;
555 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
558 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
559 sp->so_expires = jiffies;
560 list_add_tail(&sp->so_lru, &server->state_owners_lru);
561 spin_unlock(&clp->cl_lock);
563 nfs4_remove_state_owner_locked(sp);
564 spin_unlock(&clp->cl_lock);
565 nfs4_free_state_owner(sp);
570 * nfs4_purge_state_owners - Release all cached state owners
571 * @server: nfs_server with cached state owners to release
573 * Called at umount time. Remaining state owners will be on
574 * the LRU with ref count of zero.
576 void nfs4_purge_state_owners(struct nfs_server *server)
578 struct nfs_client *clp = server->nfs_client;
579 struct nfs4_state_owner *sp, *tmp;
582 spin_lock(&clp->cl_lock);
583 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
584 list_move(&sp->so_lru, &doomed);
585 nfs4_remove_state_owner_locked(sp);
587 spin_unlock(&clp->cl_lock);
589 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
590 list_del(&sp->so_lru);
591 nfs4_free_state_owner(sp);
595 static struct nfs4_state *
596 nfs4_alloc_open_state(void)
598 struct nfs4_state *state;
600 state = kzalloc(sizeof(*state), GFP_NOFS);
603 atomic_set(&state->count, 1);
604 INIT_LIST_HEAD(&state->lock_states);
605 spin_lock_init(&state->state_lock);
606 seqlock_init(&state->seqlock);
611 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
613 if (state->state == fmode)
615 /* NB! List reordering - see the reclaim code for why. */
616 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
617 if (fmode & FMODE_WRITE)
618 list_move(&state->open_states, &state->owner->so_states);
620 list_move_tail(&state->open_states, &state->owner->so_states);
622 state->state = fmode;
625 static struct nfs4_state *
626 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
628 struct nfs_inode *nfsi = NFS_I(inode);
629 struct nfs4_state *state;
631 list_for_each_entry(state, &nfsi->open_states, inode_states) {
632 if (state->owner != owner)
634 if (atomic_inc_not_zero(&state->count))
641 nfs4_free_open_state(struct nfs4_state *state)
647 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
649 struct nfs4_state *state, *new;
650 struct nfs_inode *nfsi = NFS_I(inode);
652 spin_lock(&inode->i_lock);
653 state = __nfs4_find_state_byowner(inode, owner);
654 spin_unlock(&inode->i_lock);
657 new = nfs4_alloc_open_state();
658 spin_lock(&owner->so_lock);
659 spin_lock(&inode->i_lock);
660 state = __nfs4_find_state_byowner(inode, owner);
661 if (state == NULL && new != NULL) {
663 state->owner = owner;
664 atomic_inc(&owner->so_count);
665 list_add(&state->inode_states, &nfsi->open_states);
667 state->inode = inode;
668 spin_unlock(&inode->i_lock);
669 /* Note: The reclaim code dictates that we add stateless
670 * and read-only stateids to the end of the list */
671 list_add_tail(&state->open_states, &owner->so_states);
672 spin_unlock(&owner->so_lock);
674 spin_unlock(&inode->i_lock);
675 spin_unlock(&owner->so_lock);
677 nfs4_free_open_state(new);
683 void nfs4_put_open_state(struct nfs4_state *state)
685 struct inode *inode = state->inode;
686 struct nfs4_state_owner *owner = state->owner;
688 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
690 spin_lock(&inode->i_lock);
691 list_del(&state->inode_states);
692 list_del(&state->open_states);
693 spin_unlock(&inode->i_lock);
694 spin_unlock(&owner->so_lock);
696 nfs4_free_open_state(state);
697 nfs4_put_state_owner(owner);
701 * Close the current file.
703 static void __nfs4_close(struct nfs4_state *state,
704 fmode_t fmode, gfp_t gfp_mask, int wait)
706 struct nfs4_state_owner *owner = state->owner;
710 atomic_inc(&owner->so_count);
711 /* Protect against nfs4_find_state() */
712 spin_lock(&owner->so_lock);
713 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
720 case FMODE_READ|FMODE_WRITE:
723 newstate = FMODE_READ|FMODE_WRITE;
724 if (state->n_rdwr == 0) {
725 if (state->n_rdonly == 0) {
726 newstate &= ~FMODE_READ;
727 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
728 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
730 if (state->n_wronly == 0) {
731 newstate &= ~FMODE_WRITE;
732 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
733 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
736 clear_bit(NFS_DELEGATED_STATE, &state->flags);
738 nfs4_state_set_mode_locked(state, newstate);
739 spin_unlock(&owner->so_lock);
742 nfs4_put_open_state(state);
743 nfs4_put_state_owner(owner);
745 bool roc = pnfs_roc(state->inode);
747 nfs4_do_close(state, gfp_mask, wait, roc);
751 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
753 __nfs4_close(state, fmode, GFP_NOFS, 0);
756 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
758 __nfs4_close(state, fmode, GFP_KERNEL, 1);
762 * Search the state->lock_states for an existing lock_owner
763 * that is compatible with current->files
765 static struct nfs4_lock_state *
766 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
768 struct nfs4_lock_state *pos;
769 list_for_each_entry(pos, &state->lock_states, ls_locks) {
770 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
772 switch (pos->ls_owner.lo_type) {
773 case NFS4_POSIX_LOCK_TYPE:
774 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
777 case NFS4_FLOCK_LOCK_TYPE:
778 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
781 atomic_inc(&pos->ls_count);
788 * Return a compatible lock_state. If no initialized lock_state structure
789 * exists, return an uninitialized one.
792 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)
794 struct nfs4_lock_state *lsp;
795 struct nfs_server *server = state->owner->so_server;
796 struct nfs_client *clp = server->nfs_client;
798 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
801 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
802 spin_lock_init(&lsp->ls_sequence.lock);
803 INIT_LIST_HEAD(&lsp->ls_sequence.list);
804 lsp->ls_seqid.sequence = &lsp->ls_sequence;
805 atomic_set(&lsp->ls_count, 1);
806 lsp->ls_state = state;
807 lsp->ls_owner.lo_type = type;
808 switch (lsp->ls_owner.lo_type) {
809 case NFS4_FLOCK_LOCK_TYPE:
810 lsp->ls_owner.lo_u.flock_owner = fl_pid;
812 case NFS4_POSIX_LOCK_TYPE:
813 lsp->ls_owner.lo_u.posix_owner = fl_owner;
819 spin_lock(&clp->cl_lock);
820 nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64);
821 spin_unlock(&clp->cl_lock);
822 INIT_LIST_HEAD(&lsp->ls_locks);
826 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
828 struct nfs_server *server = lsp->ls_state->owner->so_server;
829 struct nfs_client *clp = server->nfs_client;
831 spin_lock(&clp->cl_lock);
832 nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id);
833 spin_unlock(&clp->cl_lock);
834 rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
839 * Return a compatible lock_state. If no initialized lock_state structure
840 * exists, return an uninitialized one.
843 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
845 struct nfs4_lock_state *lsp, *new = NULL;
848 spin_lock(&state->state_lock);
849 lsp = __nfs4_find_lock_state(state, owner, pid, type);
853 list_add(&new->ls_locks, &state->lock_states);
854 set_bit(LK_STATE_IN_USE, &state->flags);
859 spin_unlock(&state->state_lock);
860 new = nfs4_alloc_lock_state(state, owner, pid, type);
864 spin_unlock(&state->state_lock);
866 nfs4_free_lock_state(new);
871 * Release reference to lock_state, and free it if we see that
872 * it is no longer in use
874 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
876 struct nfs4_state *state;
880 state = lsp->ls_state;
881 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
883 list_del(&lsp->ls_locks);
884 if (list_empty(&state->lock_states))
885 clear_bit(LK_STATE_IN_USE, &state->flags);
886 spin_unlock(&state->state_lock);
887 if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
888 nfs4_release_lockowner(lsp);
889 nfs4_free_lock_state(lsp);
892 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
894 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
896 dst->fl_u.nfs4_fl.owner = lsp;
897 atomic_inc(&lsp->ls_count);
900 static void nfs4_fl_release_lock(struct file_lock *fl)
902 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
905 static const struct file_lock_operations nfs4_fl_lock_ops = {
906 .fl_copy_lock = nfs4_fl_copy_lock,
907 .fl_release_private = nfs4_fl_release_lock,
910 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
912 struct nfs4_lock_state *lsp;
914 if (fl->fl_ops != NULL)
916 if (fl->fl_flags & FL_POSIX)
917 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
918 else if (fl->fl_flags & FL_FLOCK)
919 lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
924 fl->fl_u.nfs4_fl.owner = lsp;
925 fl->fl_ops = &nfs4_fl_lock_ops;
930 * Byte-range lock aware utility to initialize the stateid of read/write
933 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
935 struct nfs4_lock_state *lsp;
939 seq = read_seqbegin(&state->seqlock);
940 memcpy(dst, &state->stateid, sizeof(*dst));
941 } while (read_seqretry(&state->seqlock, seq));
942 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
945 spin_lock(&state->state_lock);
946 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
947 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
948 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
949 spin_unlock(&state->state_lock);
950 nfs4_put_lock_state(lsp);
953 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
955 struct nfs_seqid *new;
957 new = kmalloc(sizeof(*new), gfp_mask);
959 new->sequence = counter;
960 INIT_LIST_HEAD(&new->list);
965 void nfs_release_seqid(struct nfs_seqid *seqid)
967 if (!list_empty(&seqid->list)) {
968 struct rpc_sequence *sequence = seqid->sequence->sequence;
970 spin_lock(&sequence->lock);
971 list_del_init(&seqid->list);
972 spin_unlock(&sequence->lock);
973 rpc_wake_up(&sequence->wait);
977 void nfs_free_seqid(struct nfs_seqid *seqid)
979 nfs_release_seqid(seqid);
984 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
985 * failed with a seqid incrementing error -
986 * see comments nfs_fs.h:seqid_mutating_error()
988 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
990 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
994 case -NFS4ERR_BAD_SEQID:
995 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
997 printk(KERN_WARNING "NFS: v4 server returned a bad"
998 " sequence-id error on an"
999 " unconfirmed sequence %p!\n",
1001 case -NFS4ERR_STALE_CLIENTID:
1002 case -NFS4ERR_STALE_STATEID:
1003 case -NFS4ERR_BAD_STATEID:
1004 case -NFS4ERR_BADXDR:
1005 case -NFS4ERR_RESOURCE:
1006 case -NFS4ERR_NOFILEHANDLE:
1007 /* Non-seqid mutating errors */
1011 * Note: no locking needed as we are guaranteed to be first
1012 * on the sequence list
1014 seqid->sequence->counter++;
1017 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1019 struct nfs4_state_owner *sp = container_of(seqid->sequence,
1020 struct nfs4_state_owner, so_seqid);
1021 struct nfs_server *server = sp->so_server;
1023 if (status == -NFS4ERR_BAD_SEQID)
1024 nfs4_drop_state_owner(sp);
1025 if (!nfs4_has_session(server->nfs_client))
1026 nfs_increment_seqid(status, seqid);
1030 * Increment the seqid if the LOCK/LOCKU succeeded, or
1031 * failed with a seqid incrementing error -
1032 * see comments nfs_fs.h:seqid_mutating_error()
1034 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1036 nfs_increment_seqid(status, seqid);
1039 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1041 struct rpc_sequence *sequence = seqid->sequence->sequence;
1044 spin_lock(&sequence->lock);
1045 if (list_empty(&seqid->list))
1046 list_add_tail(&seqid->list, &sequence->list);
1047 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1049 rpc_sleep_on(&sequence->wait, task, NULL);
1052 spin_unlock(&sequence->lock);
1056 static int nfs4_run_state_manager(void *);
1058 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1060 smp_mb__before_clear_bit();
1061 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1062 smp_mb__after_clear_bit();
1063 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1064 rpc_wake_up(&clp->cl_rpcwaitq);
1068 * Schedule the nfs_client asynchronous state management routine
1070 void nfs4_schedule_state_manager(struct nfs_client *clp)
1072 struct task_struct *task;
1074 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1076 __module_get(THIS_MODULE);
1077 atomic_inc(&clp->cl_count);
1078 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
1079 rpc_peeraddr2str(clp->cl_rpcclient,
1083 nfs4_clear_state_manager_bit(clp);
1084 nfs_put_client(clp);
1085 module_put(THIS_MODULE);
1089 * Schedule a lease recovery attempt
1091 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1095 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1096 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1097 nfs4_schedule_state_manager(clp);
1100 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1102 nfs_handle_cb_pathdown(clp);
1103 nfs4_schedule_state_manager(clp);
1106 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1109 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1110 /* Don't recover state that expired before the reboot */
1111 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1112 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1115 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1116 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1120 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1122 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1123 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1124 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1125 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1129 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1131 struct nfs_client *clp = server->nfs_client;
1133 nfs4_state_mark_reclaim_nograce(clp, state);
1134 nfs4_schedule_state_manager(clp);
1137 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1139 struct inode *inode = state->inode;
1140 struct nfs_inode *nfsi = NFS_I(inode);
1141 struct file_lock *fl;
1144 if (inode->i_flock == NULL)
1147 /* Guard against delegation returns and new lock/unlock calls */
1148 down_write(&nfsi->rwsem);
1149 /* Protect inode->i_flock using the BKL */
1151 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1152 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1154 if (nfs_file_open_context(fl->fl_file)->state != state)
1157 status = ops->recover_lock(state, fl);
1162 case -NFS4ERR_ADMIN_REVOKED:
1163 case -NFS4ERR_STALE_STATEID:
1164 case -NFS4ERR_BAD_STATEID:
1165 case -NFS4ERR_EXPIRED:
1166 case -NFS4ERR_NO_GRACE:
1167 case -NFS4ERR_STALE_CLIENTID:
1168 case -NFS4ERR_BADSESSION:
1169 case -NFS4ERR_BADSLOT:
1170 case -NFS4ERR_BAD_HIGH_SLOT:
1171 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1174 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1177 case -NFS4ERR_DENIED:
1178 case -NFS4ERR_RECLAIM_BAD:
1179 case -NFS4ERR_RECLAIM_CONFLICT:
1180 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1187 up_write(&nfsi->rwsem);
1191 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1193 struct nfs4_state *state;
1194 struct nfs4_lock_state *lock;
1197 /* Note: we rely on the sp->so_states list being ordered
1198 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1200 * This is needed to ensure that the server won't give us any
1201 * read delegations that we have to return if, say, we are
1202 * recovering after a network partition or a reboot from a
1203 * server that doesn't support a grace period.
1206 spin_lock(&sp->so_lock);
1207 list_for_each_entry(state, &sp->so_states, open_states) {
1208 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1210 if (state->state == 0)
1212 atomic_inc(&state->count);
1213 spin_unlock(&sp->so_lock);
1214 status = ops->recover_open(sp, state);
1216 status = nfs4_reclaim_locks(state, ops);
1218 spin_lock(&state->state_lock);
1219 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1220 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1221 printk("%s: Lock reclaim failed!\n",
1224 spin_unlock(&state->state_lock);
1225 nfs4_put_open_state(state);
1231 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1237 * Open state on this file cannot be recovered
1238 * All we can do is revert to using the zero stateid.
1240 memset(state->stateid.data, 0,
1241 sizeof(state->stateid.data));
1242 /* Mark the file as being 'closed' */
1247 * User RPCSEC_GSS context has expired.
1248 * We cannot recover this stateid now, so
1249 * skip it and allow recovery thread to
1253 case -NFS4ERR_ADMIN_REVOKED:
1254 case -NFS4ERR_STALE_STATEID:
1255 case -NFS4ERR_BAD_STATEID:
1256 case -NFS4ERR_RECLAIM_BAD:
1257 case -NFS4ERR_RECLAIM_CONFLICT:
1258 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1260 case -NFS4ERR_EXPIRED:
1261 case -NFS4ERR_NO_GRACE:
1262 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1263 case -NFS4ERR_STALE_CLIENTID:
1264 case -NFS4ERR_BADSESSION:
1265 case -NFS4ERR_BADSLOT:
1266 case -NFS4ERR_BAD_HIGH_SLOT:
1267 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1270 nfs4_put_open_state(state);
1273 spin_unlock(&sp->so_lock);
1276 nfs4_put_open_state(state);
1280 static void nfs4_clear_open_state(struct nfs4_state *state)
1282 struct nfs4_lock_state *lock;
1284 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1285 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1286 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1287 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1288 spin_lock(&state->state_lock);
1289 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1290 lock->ls_seqid.flags = 0;
1291 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1293 spin_unlock(&state->state_lock);
1296 static void nfs4_reset_seqids(struct nfs_server *server,
1297 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1299 struct nfs_client *clp = server->nfs_client;
1300 struct nfs4_state_owner *sp;
1301 struct rb_node *pos;
1302 struct nfs4_state *state;
1304 spin_lock(&clp->cl_lock);
1305 for (pos = rb_first(&server->state_owners);
1307 pos = rb_next(pos)) {
1308 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1309 sp->so_seqid.flags = 0;
1310 spin_lock(&sp->so_lock);
1311 list_for_each_entry(state, &sp->so_states, open_states) {
1312 if (mark_reclaim(clp, state))
1313 nfs4_clear_open_state(state);
1315 spin_unlock(&sp->so_lock);
1317 spin_unlock(&clp->cl_lock);
1320 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1321 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1323 struct nfs_server *server;
1326 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1327 nfs4_reset_seqids(server, mark_reclaim);
1331 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1333 /* Mark all delegations for reclaim */
1334 nfs_delegation_mark_reclaim(clp);
1335 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1338 static void nfs4_reclaim_complete(struct nfs_client *clp,
1339 const struct nfs4_state_recovery_ops *ops)
1341 /* Notify the server we're done reclaiming our state */
1342 if (ops->reclaim_complete)
1343 (void)ops->reclaim_complete(clp);
1346 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1348 struct nfs_client *clp = server->nfs_client;
1349 struct nfs4_state_owner *sp;
1350 struct rb_node *pos;
1351 struct nfs4_state *state;
1353 spin_lock(&clp->cl_lock);
1354 for (pos = rb_first(&server->state_owners);
1356 pos = rb_next(pos)) {
1357 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1358 spin_lock(&sp->so_lock);
1359 list_for_each_entry(state, &sp->so_states, open_states) {
1360 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1363 nfs4_state_mark_reclaim_nograce(clp, state);
1365 spin_unlock(&sp->so_lock);
1367 spin_unlock(&clp->cl_lock);
1370 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1372 struct nfs_server *server;
1374 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1378 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1379 nfs4_clear_reclaim_server(server);
1382 nfs_delegation_reap_unclaimed(clp);
1386 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1388 if (!nfs4_state_clear_reclaim_reboot(clp))
1390 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1393 static void nfs_delegation_clear_all(struct nfs_client *clp)
1395 nfs_delegation_mark_reclaim(clp);
1396 nfs_delegation_reap_unclaimed(clp);
1399 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1401 nfs_delegation_clear_all(clp);
1402 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1405 static void nfs4_warn_keyexpired(const char *s)
1407 printk_ratelimited(KERN_WARNING "Error: state manager"
1408 " encountered RPCSEC_GSS session"
1409 " expired against NFSv4 server %s.\n",
1413 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1418 case -NFS4ERR_CB_PATH_DOWN:
1419 nfs_handle_cb_pathdown(clp);
1421 case -NFS4ERR_NO_GRACE:
1422 nfs4_state_end_reclaim_reboot(clp);
1424 case -NFS4ERR_STALE_CLIENTID:
1425 case -NFS4ERR_LEASE_MOVED:
1426 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1427 nfs4_state_clear_reclaim_reboot(clp);
1428 nfs4_state_start_reclaim_reboot(clp);
1430 case -NFS4ERR_EXPIRED:
1431 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1432 nfs4_state_start_reclaim_nograce(clp);
1434 case -NFS4ERR_BADSESSION:
1435 case -NFS4ERR_BADSLOT:
1436 case -NFS4ERR_BAD_HIGH_SLOT:
1437 case -NFS4ERR_DEADSESSION:
1438 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1439 case -NFS4ERR_SEQ_FALSE_RETRY:
1440 case -NFS4ERR_SEQ_MISORDERED:
1441 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1442 /* Zero session reset errors */
1445 /* Nothing we can do */
1446 nfs4_warn_keyexpired(clp->cl_hostname);
1454 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1456 struct nfs4_state_owner *sp;
1457 struct nfs_server *server;
1458 struct rb_node *pos;
1463 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1464 nfs4_purge_state_owners(server);
1465 spin_lock(&clp->cl_lock);
1466 for (pos = rb_first(&server->state_owners);
1468 pos = rb_next(pos)) {
1470 struct nfs4_state_owner, so_server_node);
1471 if (!test_and_clear_bit(ops->owner_flag_bit,
1474 atomic_inc(&sp->so_count);
1475 spin_unlock(&clp->cl_lock);
1478 status = nfs4_reclaim_open_state(sp, ops);
1480 set_bit(ops->owner_flag_bit, &sp->so_flags);
1481 nfs4_put_state_owner(sp);
1482 return nfs4_recovery_handle_error(clp, status);
1485 nfs4_put_state_owner(sp);
1488 spin_unlock(&clp->cl_lock);
1494 static int nfs4_check_lease(struct nfs_client *clp)
1496 struct rpc_cred *cred;
1497 const struct nfs4_state_maintenance_ops *ops =
1498 clp->cl_mvops->state_renewal_ops;
1501 /* Is the client already known to have an expired lease? */
1502 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1504 spin_lock(&clp->cl_lock);
1505 cred = ops->get_state_renewal_cred_locked(clp);
1506 spin_unlock(&clp->cl_lock);
1508 cred = nfs4_get_setclientid_cred(clp);
1513 status = ops->renew_lease(clp, cred);
1516 return nfs4_recovery_handle_error(clp, status);
1519 static int nfs4_reclaim_lease(struct nfs_client *clp)
1521 struct rpc_cred *cred;
1522 const struct nfs4_state_recovery_ops *ops =
1523 clp->cl_mvops->reboot_recovery_ops;
1524 int status = -ENOENT;
1526 cred = ops->get_clid_cred(clp);
1528 status = ops->establish_clid(clp, cred);
1530 /* Handle case where the user hasn't set up machine creds */
1531 if (status == -EACCES && cred == clp->cl_machine_cred) {
1532 nfs4_clear_machine_cred(clp);
1535 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1536 status = -EPROTONOSUPPORT;
1541 #ifdef CONFIG_NFS_V4_1
1542 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1544 struct nfs_client *clp = session->clp;
1546 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1547 nfs4_schedule_lease_recovery(clp);
1549 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1551 void nfs41_handle_recall_slot(struct nfs_client *clp)
1553 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1554 nfs4_schedule_state_manager(clp);
1557 static void nfs4_reset_all_state(struct nfs_client *clp)
1559 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1560 clp->cl_boot_time = CURRENT_TIME;
1561 nfs4_state_start_reclaim_nograce(clp);
1562 nfs4_schedule_state_manager(clp);
1566 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1568 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1569 nfs4_state_start_reclaim_reboot(clp);
1570 nfs4_schedule_state_manager(clp);
1574 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1577 nfs4_reset_all_state(clp);
1580 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1582 /* This will need to handle layouts too */
1583 nfs_expire_all_delegations(clp);
1586 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1588 nfs_expire_all_delegations(clp);
1589 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1590 nfs4_schedule_state_manager(clp);
1593 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1597 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1598 nfs41_handle_server_reboot(clp);
1599 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1600 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1601 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1602 SEQ4_STATUS_LEASE_MOVED))
1603 nfs41_handle_state_revoked(clp);
1604 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1605 nfs41_handle_recallable_state_revoked(clp);
1606 if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1607 SEQ4_STATUS_BACKCHANNEL_FAULT |
1608 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1609 nfs41_handle_cb_path_down(clp);
1612 static int nfs4_reset_session(struct nfs_client *clp)
1616 nfs4_begin_drain_session(clp);
1617 status = nfs4_proc_destroy_session(clp->cl_session);
1618 if (status && status != -NFS4ERR_BADSESSION &&
1619 status != -NFS4ERR_DEADSESSION) {
1620 status = nfs4_recovery_handle_error(clp, status);
1624 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1625 status = nfs4_proc_create_session(clp);
1627 status = nfs4_recovery_handle_error(clp, status);
1630 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1631 /* create_session negotiated new slot table */
1632 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1634 /* Let the state manager reestablish state */
1635 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1636 nfs41_setup_state_renewal(clp);
1641 static int nfs4_recall_slot(struct nfs_client *clp)
1643 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1644 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1645 struct nfs4_slot *new, *old;
1648 nfs4_begin_drain_session(clp);
1649 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1654 spin_lock(&fc_tbl->slot_tbl_lock);
1655 for (i = 0; i < fc_tbl->target_max_slots; i++)
1656 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1657 old = fc_tbl->slots;
1658 fc_tbl->slots = new;
1659 fc_tbl->max_slots = fc_tbl->target_max_slots;
1660 fc_tbl->target_max_slots = 0;
1661 fc_attrs->max_reqs = fc_tbl->max_slots;
1662 spin_unlock(&fc_tbl->slot_tbl_lock);
1665 nfs4_end_drain_session(clp);
1669 #else /* CONFIG_NFS_V4_1 */
1670 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1671 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1672 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1673 #endif /* CONFIG_NFS_V4_1 */
1675 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1676 * on EXCHANGE_ID for v4.1
1678 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1681 case -NFS4ERR_CLID_INUSE:
1682 case -NFS4ERR_STALE_CLIENTID:
1683 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1685 case -NFS4ERR_DELAY:
1692 nfs4_warn_keyexpired(clp->cl_hostname);
1693 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1694 * in nfs4_exchange_id */
1698 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1701 static void nfs4_state_manager(struct nfs_client *clp)
1705 /* Ensure exclusive access to NFSv4 state */
1707 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1708 /* We're going to have to re-establish a clientid */
1709 status = nfs4_reclaim_lease(clp);
1711 nfs4_set_lease_expired(clp, status);
1712 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1715 if (clp->cl_cons_state ==
1716 NFS_CS_SESSION_INITING)
1717 nfs_mark_client_ready(clp, status);
1720 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1722 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1724 nfs4_state_start_reclaim_nograce(clp);
1726 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1729 pnfs_destroy_all_layouts(clp);
1732 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1733 status = nfs4_check_lease(clp);
1736 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1740 /* Initialize or reset the session */
1741 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1742 && nfs4_has_session(clp)) {
1743 status = nfs4_reset_session(clp);
1744 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1750 /* First recover reboot state... */
1751 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1752 status = nfs4_do_reclaim(clp,
1753 clp->cl_mvops->reboot_recovery_ops);
1754 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1755 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1757 nfs4_state_end_reclaim_reboot(clp);
1758 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1764 /* Now recover expired state... */
1765 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1766 status = nfs4_do_reclaim(clp,
1767 clp->cl_mvops->nograce_recovery_ops);
1768 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1769 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1770 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1776 nfs4_end_drain_session(clp);
1777 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1778 nfs_client_return_marked_delegations(clp);
1781 /* Recall session slots */
1782 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1783 && nfs4_has_session(clp)) {
1784 status = nfs4_recall_slot(clp);
1791 nfs4_clear_state_manager_bit(clp);
1792 /* Did we race with an attempt to give us more work? */
1793 if (clp->cl_state == 0)
1795 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1797 } while (atomic_read(&clp->cl_count) > 1);
1800 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1801 " with error %d\n", clp->cl_hostname, -status);
1802 nfs4_end_drain_session(clp);
1803 nfs4_clear_state_manager_bit(clp);
1806 static int nfs4_run_state_manager(void *ptr)
1808 struct nfs_client *clp = ptr;
1810 allow_signal(SIGKILL);
1811 nfs4_state_manager(clp);
1812 nfs_put_client(clp);
1813 module_put_and_exit(0);