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;
193 struct nfs4_slot_table *tbl;
198 tbl = &ses->fc_slot_table;
199 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
200 spin_lock(&tbl->slot_tbl_lock);
201 max_slots = tbl->max_slots;
202 while (max_slots--) {
203 if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
204 nfs4_set_task_privileged,
208 spin_unlock(&tbl->slot_tbl_lock);
212 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
214 spin_lock(&tbl->slot_tbl_lock);
215 if (tbl->highest_used_slotid != -1) {
216 INIT_COMPLETION(tbl->complete);
217 spin_unlock(&tbl->slot_tbl_lock);
218 return wait_for_completion_interruptible(&tbl->complete);
220 spin_unlock(&tbl->slot_tbl_lock);
224 static int nfs4_begin_drain_session(struct nfs_client *clp)
226 struct nfs4_session *ses = clp->cl_session;
229 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
231 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
235 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
238 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
242 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
244 nfs4_begin_drain_session(clp);
245 status = nfs4_proc_exchange_id(clp, cred);
248 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
250 status = nfs4_proc_create_session(clp);
253 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
254 nfs41_setup_state_renewal(clp);
255 nfs_mark_client_ready(clp, NFS_CS_READY);
260 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
262 struct rpc_cred *cred;
264 spin_lock(&clp->cl_lock);
265 cred = nfs4_get_machine_cred_locked(clp);
266 spin_unlock(&clp->cl_lock);
270 #endif /* CONFIG_NFS_V4_1 */
272 static struct rpc_cred *
273 nfs4_get_setclientid_cred_server(struct nfs_server *server)
275 struct nfs_client *clp = server->nfs_client;
276 struct rpc_cred *cred = NULL;
277 struct nfs4_state_owner *sp;
280 spin_lock(&clp->cl_lock);
281 pos = rb_first(&server->state_owners);
283 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
284 cred = get_rpccred(sp->so_cred);
286 spin_unlock(&clp->cl_lock);
291 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
292 * @clp: client state handle
294 * Returns an rpc_cred with reference count bumped, or NULL.
296 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
298 struct nfs_server *server;
299 struct rpc_cred *cred;
301 spin_lock(&clp->cl_lock);
302 cred = nfs4_get_machine_cred_locked(clp);
303 spin_unlock(&clp->cl_lock);
308 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
309 cred = nfs4_get_setclientid_cred_server(server);
319 static struct nfs4_state_owner *
320 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
322 struct rb_node **p = &server->state_owners.rb_node,
324 struct nfs4_state_owner *sp;
328 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
330 if (cred < sp->so_cred)
331 p = &parent->rb_left;
332 else if (cred > sp->so_cred)
333 p = &parent->rb_right;
335 if (!list_empty(&sp->so_lru))
336 list_del_init(&sp->so_lru);
337 atomic_inc(&sp->so_count);
344 static struct nfs4_state_owner *
345 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
347 struct nfs_server *server = new->so_server;
348 struct rb_node **p = &server->state_owners.rb_node,
350 struct nfs4_state_owner *sp;
355 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
357 if (new->so_cred < sp->so_cred)
358 p = &parent->rb_left;
359 else if (new->so_cred > sp->so_cred)
360 p = &parent->rb_right;
362 if (!list_empty(&sp->so_lru))
363 list_del_init(&sp->so_lru);
364 atomic_inc(&sp->so_count);
368 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
371 rb_link_node(&new->so_server_node, parent, p);
372 rb_insert_color(&new->so_server_node, &server->state_owners);
377 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
379 struct nfs_server *server = sp->so_server;
381 if (!RB_EMPTY_NODE(&sp->so_server_node))
382 rb_erase(&sp->so_server_node, &server->state_owners);
383 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
387 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
391 spin_lock_init(&sc->lock);
392 INIT_LIST_HEAD(&sc->list);
393 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
397 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
399 rpc_destroy_wait_queue(&sc->wait);
403 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
404 * create a new state_owner.
407 static struct nfs4_state_owner *
408 nfs4_alloc_state_owner(struct nfs_server *server,
409 struct rpc_cred *cred,
412 struct nfs4_state_owner *sp;
414 sp = kzalloc(sizeof(*sp), gfp_flags);
417 sp->so_server = server;
418 sp->so_cred = get_rpccred(cred);
419 spin_lock_init(&sp->so_lock);
420 INIT_LIST_HEAD(&sp->so_states);
421 nfs4_init_seqid_counter(&sp->so_seqid);
422 atomic_set(&sp->so_count, 1);
423 INIT_LIST_HEAD(&sp->so_lru);
428 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
430 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
431 struct nfs_server *server = sp->so_server;
432 struct nfs_client *clp = server->nfs_client;
434 spin_lock(&clp->cl_lock);
435 rb_erase(&sp->so_server_node, &server->state_owners);
436 RB_CLEAR_NODE(&sp->so_server_node);
437 spin_unlock(&clp->cl_lock);
441 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
443 nfs4_destroy_seqid_counter(&sp->so_seqid);
444 put_rpccred(sp->so_cred);
448 static void nfs4_gc_state_owners(struct nfs_server *server)
450 struct nfs_client *clp = server->nfs_client;
451 struct nfs4_state_owner *sp, *tmp;
452 unsigned long time_min, time_max;
455 spin_lock(&clp->cl_lock);
457 time_min = (long)time_max - (long)clp->cl_lease_time;
458 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
459 /* NB: LRU is sorted so that oldest is at the head */
460 if (time_in_range(sp->so_expires, time_min, time_max))
462 list_move(&sp->so_lru, &doomed);
463 nfs4_remove_state_owner_locked(sp);
465 spin_unlock(&clp->cl_lock);
467 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
468 list_del(&sp->so_lru);
469 nfs4_free_state_owner(sp);
474 * nfs4_get_state_owner - Look up a state owner given a credential
475 * @server: nfs_server to search
476 * @cred: RPC credential to match
478 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
480 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
481 struct rpc_cred *cred,
484 struct nfs_client *clp = server->nfs_client;
485 struct nfs4_state_owner *sp, *new;
487 spin_lock(&clp->cl_lock);
488 sp = nfs4_find_state_owner_locked(server, cred);
489 spin_unlock(&clp->cl_lock);
492 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
496 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
498 spin_lock(&clp->cl_lock);
499 sp = nfs4_insert_state_owner_locked(new);
500 spin_unlock(&clp->cl_lock);
501 } while (sp == ERR_PTR(-EAGAIN));
503 nfs4_free_state_owner(new);
505 nfs4_gc_state_owners(server);
510 * nfs4_put_state_owner - Release a nfs4_state_owner
511 * @sp: state owner data to release
513 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
515 struct nfs_server *server = sp->so_server;
516 struct nfs_client *clp = server->nfs_client;
518 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
521 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
522 sp->so_expires = jiffies;
523 list_add_tail(&sp->so_lru, &server->state_owners_lru);
524 spin_unlock(&clp->cl_lock);
526 nfs4_remove_state_owner_locked(sp);
527 spin_unlock(&clp->cl_lock);
528 nfs4_free_state_owner(sp);
533 * nfs4_purge_state_owners - Release all cached state owners
534 * @server: nfs_server with cached state owners to release
536 * Called at umount time. Remaining state owners will be on
537 * the LRU with ref count of zero.
539 void nfs4_purge_state_owners(struct nfs_server *server)
541 struct nfs_client *clp = server->nfs_client;
542 struct nfs4_state_owner *sp, *tmp;
545 spin_lock(&clp->cl_lock);
546 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
547 list_move(&sp->so_lru, &doomed);
548 nfs4_remove_state_owner_locked(sp);
550 spin_unlock(&clp->cl_lock);
552 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
553 list_del(&sp->so_lru);
554 nfs4_free_state_owner(sp);
558 static struct nfs4_state *
559 nfs4_alloc_open_state(void)
561 struct nfs4_state *state;
563 state = kzalloc(sizeof(*state), GFP_NOFS);
566 atomic_set(&state->count, 1);
567 INIT_LIST_HEAD(&state->lock_states);
568 spin_lock_init(&state->state_lock);
569 seqlock_init(&state->seqlock);
574 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
576 if (state->state == fmode)
578 /* NB! List reordering - see the reclaim code for why. */
579 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
580 if (fmode & FMODE_WRITE)
581 list_move(&state->open_states, &state->owner->so_states);
583 list_move_tail(&state->open_states, &state->owner->so_states);
585 state->state = fmode;
588 static struct nfs4_state *
589 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
591 struct nfs_inode *nfsi = NFS_I(inode);
592 struct nfs4_state *state;
594 list_for_each_entry(state, &nfsi->open_states, inode_states) {
595 if (state->owner != owner)
597 if (atomic_inc_not_zero(&state->count))
604 nfs4_free_open_state(struct nfs4_state *state)
610 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
612 struct nfs4_state *state, *new;
613 struct nfs_inode *nfsi = NFS_I(inode);
615 spin_lock(&inode->i_lock);
616 state = __nfs4_find_state_byowner(inode, owner);
617 spin_unlock(&inode->i_lock);
620 new = nfs4_alloc_open_state();
621 spin_lock(&owner->so_lock);
622 spin_lock(&inode->i_lock);
623 state = __nfs4_find_state_byowner(inode, owner);
624 if (state == NULL && new != NULL) {
626 state->owner = owner;
627 atomic_inc(&owner->so_count);
628 list_add(&state->inode_states, &nfsi->open_states);
630 state->inode = inode;
631 spin_unlock(&inode->i_lock);
632 /* Note: The reclaim code dictates that we add stateless
633 * and read-only stateids to the end of the list */
634 list_add_tail(&state->open_states, &owner->so_states);
635 spin_unlock(&owner->so_lock);
637 spin_unlock(&inode->i_lock);
638 spin_unlock(&owner->so_lock);
640 nfs4_free_open_state(new);
646 void nfs4_put_open_state(struct nfs4_state *state)
648 struct inode *inode = state->inode;
649 struct nfs4_state_owner *owner = state->owner;
651 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
653 spin_lock(&inode->i_lock);
654 list_del(&state->inode_states);
655 list_del(&state->open_states);
656 spin_unlock(&inode->i_lock);
657 spin_unlock(&owner->so_lock);
659 nfs4_free_open_state(state);
660 nfs4_put_state_owner(owner);
664 * Close the current file.
666 static void __nfs4_close(struct nfs4_state *state,
667 fmode_t fmode, gfp_t gfp_mask, int wait)
669 struct nfs4_state_owner *owner = state->owner;
673 atomic_inc(&owner->so_count);
674 /* Protect against nfs4_find_state() */
675 spin_lock(&owner->so_lock);
676 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
683 case FMODE_READ|FMODE_WRITE:
686 newstate = FMODE_READ|FMODE_WRITE;
687 if (state->n_rdwr == 0) {
688 if (state->n_rdonly == 0) {
689 newstate &= ~FMODE_READ;
690 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
691 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
693 if (state->n_wronly == 0) {
694 newstate &= ~FMODE_WRITE;
695 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
696 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
699 clear_bit(NFS_DELEGATED_STATE, &state->flags);
701 nfs4_state_set_mode_locked(state, newstate);
702 spin_unlock(&owner->so_lock);
705 nfs4_put_open_state(state);
706 nfs4_put_state_owner(owner);
708 bool roc = pnfs_roc(state->inode);
710 nfs4_do_close(state, gfp_mask, wait, roc);
714 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
716 __nfs4_close(state, fmode, GFP_NOFS, 0);
719 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
721 __nfs4_close(state, fmode, GFP_KERNEL, 1);
725 * Search the state->lock_states for an existing lock_owner
726 * that is compatible with current->files
728 static struct nfs4_lock_state *
729 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
731 struct nfs4_lock_state *pos;
732 list_for_each_entry(pos, &state->lock_states, ls_locks) {
733 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
735 switch (pos->ls_owner.lo_type) {
736 case NFS4_POSIX_LOCK_TYPE:
737 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
740 case NFS4_FLOCK_LOCK_TYPE:
741 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
744 atomic_inc(&pos->ls_count);
751 * Return a compatible lock_state. If no initialized lock_state structure
752 * exists, return an uninitialized one.
755 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)
757 struct nfs4_lock_state *lsp;
758 struct nfs_server *server = state->owner->so_server;
760 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
763 nfs4_init_seqid_counter(&lsp->ls_seqid);
764 atomic_set(&lsp->ls_count, 1);
765 lsp->ls_state = state;
766 lsp->ls_owner.lo_type = type;
767 switch (lsp->ls_owner.lo_type) {
768 case NFS4_FLOCK_LOCK_TYPE:
769 lsp->ls_owner.lo_u.flock_owner = fl_pid;
771 case NFS4_POSIX_LOCK_TYPE:
772 lsp->ls_owner.lo_u.posix_owner = fl_owner;
777 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
778 if (lsp->ls_seqid.owner_id < 0)
780 INIT_LIST_HEAD(&lsp->ls_locks);
787 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
789 struct nfs_server *server = lsp->ls_state->owner->so_server;
791 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
792 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
797 * Return a compatible lock_state. If no initialized lock_state structure
798 * exists, return an uninitialized one.
801 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
803 struct nfs4_lock_state *lsp, *new = NULL;
806 spin_lock(&state->state_lock);
807 lsp = __nfs4_find_lock_state(state, owner, pid, type);
811 list_add(&new->ls_locks, &state->lock_states);
812 set_bit(LK_STATE_IN_USE, &state->flags);
817 spin_unlock(&state->state_lock);
818 new = nfs4_alloc_lock_state(state, owner, pid, type);
822 spin_unlock(&state->state_lock);
824 nfs4_free_lock_state(new);
829 * Release reference to lock_state, and free it if we see that
830 * it is no longer in use
832 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
834 struct nfs4_state *state;
838 state = lsp->ls_state;
839 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
841 list_del(&lsp->ls_locks);
842 if (list_empty(&state->lock_states))
843 clear_bit(LK_STATE_IN_USE, &state->flags);
844 spin_unlock(&state->state_lock);
845 if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
846 nfs4_release_lockowner(lsp);
847 nfs4_free_lock_state(lsp);
850 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
852 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
854 dst->fl_u.nfs4_fl.owner = lsp;
855 atomic_inc(&lsp->ls_count);
858 static void nfs4_fl_release_lock(struct file_lock *fl)
860 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
863 static const struct file_lock_operations nfs4_fl_lock_ops = {
864 .fl_copy_lock = nfs4_fl_copy_lock,
865 .fl_release_private = nfs4_fl_release_lock,
868 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
870 struct nfs4_lock_state *lsp;
872 if (fl->fl_ops != NULL)
874 if (fl->fl_flags & FL_POSIX)
875 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
876 else if (fl->fl_flags & FL_FLOCK)
877 lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
882 fl->fl_u.nfs4_fl.owner = lsp;
883 fl->fl_ops = &nfs4_fl_lock_ops;
888 * Byte-range lock aware utility to initialize the stateid of read/write
891 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
893 struct nfs4_lock_state *lsp;
897 seq = read_seqbegin(&state->seqlock);
898 memcpy(dst, &state->stateid, sizeof(*dst));
899 } while (read_seqretry(&state->seqlock, seq));
900 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
903 spin_lock(&state->state_lock);
904 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
905 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
906 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
907 spin_unlock(&state->state_lock);
908 nfs4_put_lock_state(lsp);
911 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
913 struct nfs_seqid *new;
915 new = kmalloc(sizeof(*new), gfp_mask);
917 new->sequence = counter;
918 INIT_LIST_HEAD(&new->list);
923 void nfs_release_seqid(struct nfs_seqid *seqid)
925 if (!list_empty(&seqid->list)) {
926 struct nfs_seqid_counter *sequence = seqid->sequence;
928 spin_lock(&sequence->lock);
929 list_del_init(&seqid->list);
930 spin_unlock(&sequence->lock);
931 rpc_wake_up(&sequence->wait);
935 void nfs_free_seqid(struct nfs_seqid *seqid)
937 nfs_release_seqid(seqid);
942 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
943 * failed with a seqid incrementing error -
944 * see comments nfs_fs.h:seqid_mutating_error()
946 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
948 BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
952 case -NFS4ERR_BAD_SEQID:
953 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
955 printk(KERN_WARNING "NFS: v4 server returned a bad"
956 " sequence-id error on an"
957 " unconfirmed sequence %p!\n",
959 case -NFS4ERR_STALE_CLIENTID:
960 case -NFS4ERR_STALE_STATEID:
961 case -NFS4ERR_BAD_STATEID:
962 case -NFS4ERR_BADXDR:
963 case -NFS4ERR_RESOURCE:
964 case -NFS4ERR_NOFILEHANDLE:
965 /* Non-seqid mutating errors */
969 * Note: no locking needed as we are guaranteed to be first
970 * on the sequence list
972 seqid->sequence->counter++;
975 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
977 struct nfs4_state_owner *sp = container_of(seqid->sequence,
978 struct nfs4_state_owner, so_seqid);
979 struct nfs_server *server = sp->so_server;
981 if (status == -NFS4ERR_BAD_SEQID)
982 nfs4_drop_state_owner(sp);
983 if (!nfs4_has_session(server->nfs_client))
984 nfs_increment_seqid(status, seqid);
988 * Increment the seqid if the LOCK/LOCKU succeeded, or
989 * failed with a seqid incrementing error -
990 * see comments nfs_fs.h:seqid_mutating_error()
992 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
994 nfs_increment_seqid(status, seqid);
997 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
999 struct nfs_seqid_counter *sequence = seqid->sequence;
1002 spin_lock(&sequence->lock);
1003 if (list_empty(&seqid->list))
1004 list_add_tail(&seqid->list, &sequence->list);
1005 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1007 rpc_sleep_on(&sequence->wait, task, NULL);
1010 spin_unlock(&sequence->lock);
1014 static int nfs4_run_state_manager(void *);
1016 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1018 smp_mb__before_clear_bit();
1019 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1020 smp_mb__after_clear_bit();
1021 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1022 rpc_wake_up(&clp->cl_rpcwaitq);
1026 * Schedule the nfs_client asynchronous state management routine
1028 void nfs4_schedule_state_manager(struct nfs_client *clp)
1030 struct task_struct *task;
1032 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1034 __module_get(THIS_MODULE);
1035 atomic_inc(&clp->cl_count);
1036 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
1037 rpc_peeraddr2str(clp->cl_rpcclient,
1041 nfs4_clear_state_manager_bit(clp);
1042 nfs_put_client(clp);
1043 module_put(THIS_MODULE);
1047 * Schedule a lease recovery attempt
1049 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1053 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1054 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1055 nfs4_schedule_state_manager(clp);
1058 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1060 nfs_handle_cb_pathdown(clp);
1061 nfs4_schedule_state_manager(clp);
1064 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1067 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1068 /* Don't recover state that expired before the reboot */
1069 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1070 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1073 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1074 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1078 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1080 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1081 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1082 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1083 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1087 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1089 struct nfs_client *clp = server->nfs_client;
1091 nfs4_state_mark_reclaim_nograce(clp, state);
1092 nfs4_schedule_state_manager(clp);
1095 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1097 struct inode *inode = state->inode;
1098 struct nfs_inode *nfsi = NFS_I(inode);
1099 struct file_lock *fl;
1102 if (inode->i_flock == NULL)
1105 /* Guard against delegation returns and new lock/unlock calls */
1106 down_write(&nfsi->rwsem);
1107 /* Protect inode->i_flock using the BKL */
1109 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1110 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1112 if (nfs_file_open_context(fl->fl_file)->state != state)
1115 status = ops->recover_lock(state, fl);
1120 case -NFS4ERR_ADMIN_REVOKED:
1121 case -NFS4ERR_STALE_STATEID:
1122 case -NFS4ERR_BAD_STATEID:
1123 case -NFS4ERR_EXPIRED:
1124 case -NFS4ERR_NO_GRACE:
1125 case -NFS4ERR_STALE_CLIENTID:
1126 case -NFS4ERR_BADSESSION:
1127 case -NFS4ERR_BADSLOT:
1128 case -NFS4ERR_BAD_HIGH_SLOT:
1129 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1132 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1135 case -NFS4ERR_DENIED:
1136 case -NFS4ERR_RECLAIM_BAD:
1137 case -NFS4ERR_RECLAIM_CONFLICT:
1138 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1145 up_write(&nfsi->rwsem);
1149 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1151 struct nfs4_state *state;
1152 struct nfs4_lock_state *lock;
1155 /* Note: we rely on the sp->so_states list being ordered
1156 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1158 * This is needed to ensure that the server won't give us any
1159 * read delegations that we have to return if, say, we are
1160 * recovering after a network partition or a reboot from a
1161 * server that doesn't support a grace period.
1164 spin_lock(&sp->so_lock);
1165 list_for_each_entry(state, &sp->so_states, open_states) {
1166 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1168 if (state->state == 0)
1170 atomic_inc(&state->count);
1171 spin_unlock(&sp->so_lock);
1172 status = ops->recover_open(sp, state);
1174 status = nfs4_reclaim_locks(state, ops);
1176 spin_lock(&state->state_lock);
1177 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1178 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1179 printk("%s: Lock reclaim failed!\n",
1182 spin_unlock(&state->state_lock);
1183 nfs4_put_open_state(state);
1189 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1195 * Open state on this file cannot be recovered
1196 * All we can do is revert to using the zero stateid.
1198 memset(state->stateid.data, 0,
1199 sizeof(state->stateid.data));
1200 /* Mark the file as being 'closed' */
1205 * User RPCSEC_GSS context has expired.
1206 * We cannot recover this stateid now, so
1207 * skip it and allow recovery thread to
1211 case -NFS4ERR_ADMIN_REVOKED:
1212 case -NFS4ERR_STALE_STATEID:
1213 case -NFS4ERR_BAD_STATEID:
1214 case -NFS4ERR_RECLAIM_BAD:
1215 case -NFS4ERR_RECLAIM_CONFLICT:
1216 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1218 case -NFS4ERR_EXPIRED:
1219 case -NFS4ERR_NO_GRACE:
1220 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1221 case -NFS4ERR_STALE_CLIENTID:
1222 case -NFS4ERR_BADSESSION:
1223 case -NFS4ERR_BADSLOT:
1224 case -NFS4ERR_BAD_HIGH_SLOT:
1225 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1228 nfs4_put_open_state(state);
1231 spin_unlock(&sp->so_lock);
1234 nfs4_put_open_state(state);
1238 static void nfs4_clear_open_state(struct nfs4_state *state)
1240 struct nfs4_lock_state *lock;
1242 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1243 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1244 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1245 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1246 spin_lock(&state->state_lock);
1247 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1248 lock->ls_seqid.flags = 0;
1249 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1251 spin_unlock(&state->state_lock);
1254 static void nfs4_reset_seqids(struct nfs_server *server,
1255 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1257 struct nfs_client *clp = server->nfs_client;
1258 struct nfs4_state_owner *sp;
1259 struct rb_node *pos;
1260 struct nfs4_state *state;
1262 spin_lock(&clp->cl_lock);
1263 for (pos = rb_first(&server->state_owners);
1265 pos = rb_next(pos)) {
1266 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1267 sp->so_seqid.flags = 0;
1268 spin_lock(&sp->so_lock);
1269 list_for_each_entry(state, &sp->so_states, open_states) {
1270 if (mark_reclaim(clp, state))
1271 nfs4_clear_open_state(state);
1273 spin_unlock(&sp->so_lock);
1275 spin_unlock(&clp->cl_lock);
1278 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1279 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1281 struct nfs_server *server;
1284 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1285 nfs4_reset_seqids(server, mark_reclaim);
1289 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1291 /* Mark all delegations for reclaim */
1292 nfs_delegation_mark_reclaim(clp);
1293 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1296 static void nfs4_reclaim_complete(struct nfs_client *clp,
1297 const struct nfs4_state_recovery_ops *ops)
1299 /* Notify the server we're done reclaiming our state */
1300 if (ops->reclaim_complete)
1301 (void)ops->reclaim_complete(clp);
1304 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1306 struct nfs_client *clp = server->nfs_client;
1307 struct nfs4_state_owner *sp;
1308 struct rb_node *pos;
1309 struct nfs4_state *state;
1311 spin_lock(&clp->cl_lock);
1312 for (pos = rb_first(&server->state_owners);
1314 pos = rb_next(pos)) {
1315 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1316 spin_lock(&sp->so_lock);
1317 list_for_each_entry(state, &sp->so_states, open_states) {
1318 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1321 nfs4_state_mark_reclaim_nograce(clp, state);
1323 spin_unlock(&sp->so_lock);
1325 spin_unlock(&clp->cl_lock);
1328 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1330 struct nfs_server *server;
1332 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1336 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1337 nfs4_clear_reclaim_server(server);
1340 nfs_delegation_reap_unclaimed(clp);
1344 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1346 if (!nfs4_state_clear_reclaim_reboot(clp))
1348 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1351 static void nfs_delegation_clear_all(struct nfs_client *clp)
1353 nfs_delegation_mark_reclaim(clp);
1354 nfs_delegation_reap_unclaimed(clp);
1357 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1359 nfs_delegation_clear_all(clp);
1360 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1363 static void nfs4_warn_keyexpired(const char *s)
1365 printk_ratelimited(KERN_WARNING "Error: state manager"
1366 " encountered RPCSEC_GSS session"
1367 " expired against NFSv4 server %s.\n",
1371 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1376 case -NFS4ERR_CB_PATH_DOWN:
1377 nfs_handle_cb_pathdown(clp);
1379 case -NFS4ERR_NO_GRACE:
1380 nfs4_state_end_reclaim_reboot(clp);
1382 case -NFS4ERR_STALE_CLIENTID:
1383 case -NFS4ERR_LEASE_MOVED:
1384 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1385 nfs4_state_clear_reclaim_reboot(clp);
1386 nfs4_state_start_reclaim_reboot(clp);
1388 case -NFS4ERR_EXPIRED:
1389 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1390 nfs4_state_start_reclaim_nograce(clp);
1392 case -NFS4ERR_BADSESSION:
1393 case -NFS4ERR_BADSLOT:
1394 case -NFS4ERR_BAD_HIGH_SLOT:
1395 case -NFS4ERR_DEADSESSION:
1396 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1397 case -NFS4ERR_SEQ_FALSE_RETRY:
1398 case -NFS4ERR_SEQ_MISORDERED:
1399 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1400 /* Zero session reset errors */
1403 /* Nothing we can do */
1404 nfs4_warn_keyexpired(clp->cl_hostname);
1412 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1414 struct nfs4_state_owner *sp;
1415 struct nfs_server *server;
1416 struct rb_node *pos;
1421 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1422 nfs4_purge_state_owners(server);
1423 spin_lock(&clp->cl_lock);
1424 for (pos = rb_first(&server->state_owners);
1426 pos = rb_next(pos)) {
1428 struct nfs4_state_owner, so_server_node);
1429 if (!test_and_clear_bit(ops->owner_flag_bit,
1432 atomic_inc(&sp->so_count);
1433 spin_unlock(&clp->cl_lock);
1436 status = nfs4_reclaim_open_state(sp, ops);
1438 set_bit(ops->owner_flag_bit, &sp->so_flags);
1439 nfs4_put_state_owner(sp);
1440 return nfs4_recovery_handle_error(clp, status);
1443 nfs4_put_state_owner(sp);
1446 spin_unlock(&clp->cl_lock);
1452 static int nfs4_check_lease(struct nfs_client *clp)
1454 struct rpc_cred *cred;
1455 const struct nfs4_state_maintenance_ops *ops =
1456 clp->cl_mvops->state_renewal_ops;
1459 /* Is the client already known to have an expired lease? */
1460 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1462 spin_lock(&clp->cl_lock);
1463 cred = ops->get_state_renewal_cred_locked(clp);
1464 spin_unlock(&clp->cl_lock);
1466 cred = nfs4_get_setclientid_cred(clp);
1471 status = ops->renew_lease(clp, cred);
1474 return nfs4_recovery_handle_error(clp, status);
1477 static int nfs4_reclaim_lease(struct nfs_client *clp)
1479 struct rpc_cred *cred;
1480 const struct nfs4_state_recovery_ops *ops =
1481 clp->cl_mvops->reboot_recovery_ops;
1482 int status = -ENOENT;
1484 cred = ops->get_clid_cred(clp);
1486 status = ops->establish_clid(clp, cred);
1488 /* Handle case where the user hasn't set up machine creds */
1489 if (status == -EACCES && cred == clp->cl_machine_cred) {
1490 nfs4_clear_machine_cred(clp);
1493 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1494 status = -EPROTONOSUPPORT;
1499 #ifdef CONFIG_NFS_V4_1
1500 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1502 struct nfs_client *clp = session->clp;
1504 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1505 nfs4_schedule_lease_recovery(clp);
1507 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1509 void nfs41_handle_recall_slot(struct nfs_client *clp)
1511 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1512 nfs4_schedule_state_manager(clp);
1515 static void nfs4_reset_all_state(struct nfs_client *clp)
1517 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1518 clp->cl_boot_time = CURRENT_TIME;
1519 nfs4_state_start_reclaim_nograce(clp);
1520 nfs4_schedule_state_manager(clp);
1524 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1526 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1527 nfs4_state_start_reclaim_reboot(clp);
1528 nfs4_schedule_state_manager(clp);
1532 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1535 nfs4_reset_all_state(clp);
1538 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1540 /* This will need to handle layouts too */
1541 nfs_expire_all_delegations(clp);
1544 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1546 nfs_expire_all_delegations(clp);
1547 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1548 nfs4_schedule_state_manager(clp);
1551 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1555 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1556 nfs41_handle_server_reboot(clp);
1557 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1558 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1559 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1560 SEQ4_STATUS_LEASE_MOVED))
1561 nfs41_handle_state_revoked(clp);
1562 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1563 nfs41_handle_recallable_state_revoked(clp);
1564 if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1565 SEQ4_STATUS_BACKCHANNEL_FAULT |
1566 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1567 nfs41_handle_cb_path_down(clp);
1570 static int nfs4_reset_session(struct nfs_client *clp)
1574 nfs4_begin_drain_session(clp);
1575 status = nfs4_proc_destroy_session(clp->cl_session);
1576 if (status && status != -NFS4ERR_BADSESSION &&
1577 status != -NFS4ERR_DEADSESSION) {
1578 status = nfs4_recovery_handle_error(clp, status);
1582 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1583 status = nfs4_proc_create_session(clp);
1585 status = nfs4_recovery_handle_error(clp, status);
1588 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1589 /* create_session negotiated new slot table */
1590 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1592 /* Let the state manager reestablish state */
1593 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1594 nfs41_setup_state_renewal(clp);
1599 static int nfs4_recall_slot(struct nfs_client *clp)
1601 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1602 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1603 struct nfs4_slot *new, *old;
1606 nfs4_begin_drain_session(clp);
1607 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1612 spin_lock(&fc_tbl->slot_tbl_lock);
1613 for (i = 0; i < fc_tbl->target_max_slots; i++)
1614 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1615 old = fc_tbl->slots;
1616 fc_tbl->slots = new;
1617 fc_tbl->max_slots = fc_tbl->target_max_slots;
1618 fc_tbl->target_max_slots = 0;
1619 fc_attrs->max_reqs = fc_tbl->max_slots;
1620 spin_unlock(&fc_tbl->slot_tbl_lock);
1623 nfs4_end_drain_session(clp);
1627 #else /* CONFIG_NFS_V4_1 */
1628 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1629 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1630 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1631 #endif /* CONFIG_NFS_V4_1 */
1633 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1634 * on EXCHANGE_ID for v4.1
1636 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1639 case -NFS4ERR_CLID_INUSE:
1640 case -NFS4ERR_STALE_CLIENTID:
1641 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1643 case -NFS4ERR_DELAY:
1650 nfs4_warn_keyexpired(clp->cl_hostname);
1651 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1652 * in nfs4_exchange_id */
1656 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1659 static void nfs4_state_manager(struct nfs_client *clp)
1663 /* Ensure exclusive access to NFSv4 state */
1665 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1666 /* We're going to have to re-establish a clientid */
1667 status = nfs4_reclaim_lease(clp);
1669 nfs4_set_lease_expired(clp, status);
1670 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1673 if (clp->cl_cons_state ==
1674 NFS_CS_SESSION_INITING)
1675 nfs_mark_client_ready(clp, status);
1678 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1680 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1682 nfs4_state_start_reclaim_nograce(clp);
1684 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1687 pnfs_destroy_all_layouts(clp);
1690 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1691 status = nfs4_check_lease(clp);
1694 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1698 /* Initialize or reset the session */
1699 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1700 && nfs4_has_session(clp)) {
1701 status = nfs4_reset_session(clp);
1702 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1708 /* First recover reboot state... */
1709 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1710 status = nfs4_do_reclaim(clp,
1711 clp->cl_mvops->reboot_recovery_ops);
1712 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1713 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1715 nfs4_state_end_reclaim_reboot(clp);
1716 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1722 /* Now recover expired state... */
1723 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1724 status = nfs4_do_reclaim(clp,
1725 clp->cl_mvops->nograce_recovery_ops);
1726 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1727 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1728 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1734 nfs4_end_drain_session(clp);
1735 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1736 nfs_client_return_marked_delegations(clp);
1739 /* Recall session slots */
1740 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1741 && nfs4_has_session(clp)) {
1742 status = nfs4_recall_slot(clp);
1749 nfs4_clear_state_manager_bit(clp);
1750 /* Did we race with an attempt to give us more work? */
1751 if (clp->cl_state == 0)
1753 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1755 } while (atomic_read(&clp->cl_count) > 1);
1758 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1759 " with error %d\n", clp->cl_hostname, -status);
1760 nfs4_end_drain_session(clp);
1761 nfs4_clear_state_manager_bit(clp);
1764 static int nfs4_run_state_manager(void *ptr)
1766 struct nfs_client *clp = ptr;
1768 allow_signal(SIGKILL);
1769 nfs4_state_manager(clp);
1770 nfs_put_client(clp);
1771 module_put_and_exit(0);