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 != NFS4_NO_SLOT) {
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_select_rw_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 nfs4_stateid_copy(dst, &state->stateid);
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 nfs4_stateid_copy(dst, &lsp->ls_stateid);
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);
924 void nfs_release_seqid(struct nfs_seqid *seqid)
926 struct nfs_seqid_counter *sequence;
928 if (list_empty(&seqid->list))
930 sequence = seqid->sequence;
931 spin_lock(&sequence->lock);
932 list_del_init(&seqid->list);
933 if (!list_empty(&sequence->list)) {
934 struct nfs_seqid *next;
936 next = list_first_entry(&sequence->list,
937 struct nfs_seqid, list);
938 rpc_wake_up_queued_task(&sequence->wait, next->task);
940 spin_unlock(&sequence->lock);
943 void nfs_free_seqid(struct nfs_seqid *seqid)
945 nfs_release_seqid(seqid);
950 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
951 * failed with a seqid incrementing error -
952 * see comments nfs_fs.h:seqid_mutating_error()
954 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
956 BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
960 case -NFS4ERR_BAD_SEQID:
961 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
963 printk(KERN_WARNING "NFS: v4 server returned a bad"
964 " sequence-id error on an"
965 " unconfirmed sequence %p!\n",
967 case -NFS4ERR_STALE_CLIENTID:
968 case -NFS4ERR_STALE_STATEID:
969 case -NFS4ERR_BAD_STATEID:
970 case -NFS4ERR_BADXDR:
971 case -NFS4ERR_RESOURCE:
972 case -NFS4ERR_NOFILEHANDLE:
973 /* Non-seqid mutating errors */
977 * Note: no locking needed as we are guaranteed to be first
978 * on the sequence list
980 seqid->sequence->counter++;
983 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
985 struct nfs4_state_owner *sp = container_of(seqid->sequence,
986 struct nfs4_state_owner, so_seqid);
987 struct nfs_server *server = sp->so_server;
989 if (status == -NFS4ERR_BAD_SEQID)
990 nfs4_drop_state_owner(sp);
991 if (!nfs4_has_session(server->nfs_client))
992 nfs_increment_seqid(status, seqid);
996 * Increment the seqid if the LOCK/LOCKU succeeded, or
997 * failed with a seqid incrementing error -
998 * see comments nfs_fs.h:seqid_mutating_error()
1000 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1002 nfs_increment_seqid(status, seqid);
1005 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1007 struct nfs_seqid_counter *sequence = seqid->sequence;
1010 spin_lock(&sequence->lock);
1012 if (list_empty(&seqid->list))
1013 list_add_tail(&seqid->list, &sequence->list);
1014 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1016 rpc_sleep_on(&sequence->wait, task, NULL);
1019 spin_unlock(&sequence->lock);
1023 static int nfs4_run_state_manager(void *);
1025 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1027 smp_mb__before_clear_bit();
1028 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1029 smp_mb__after_clear_bit();
1030 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1031 rpc_wake_up(&clp->cl_rpcwaitq);
1035 * Schedule the nfs_client asynchronous state management routine
1037 void nfs4_schedule_state_manager(struct nfs_client *clp)
1039 struct task_struct *task;
1040 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1042 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1044 __module_get(THIS_MODULE);
1045 atomic_inc(&clp->cl_count);
1047 /* The rcu_read_lock() is not strictly necessary, as the state
1048 * manager is the only thread that ever changes the rpc_xprt
1049 * after it's initialized. At this point, we're single threaded. */
1051 snprintf(buf, sizeof(buf), "%s-manager",
1052 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1054 task = kthread_run(nfs4_run_state_manager, clp, buf);
1056 printk(KERN_ERR "%s: kthread_run: %ld\n",
1057 __func__, PTR_ERR(task));
1058 nfs4_clear_state_manager_bit(clp);
1059 nfs_put_client(clp);
1060 module_put(THIS_MODULE);
1065 * Schedule a lease recovery attempt
1067 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1071 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1072 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1073 nfs4_schedule_state_manager(clp);
1076 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1078 nfs_handle_cb_pathdown(clp);
1079 nfs4_schedule_state_manager(clp);
1082 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1085 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1086 /* Don't recover state that expired before the reboot */
1087 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1088 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1091 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1092 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1096 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1098 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1099 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1100 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1101 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1105 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1107 struct nfs_client *clp = server->nfs_client;
1109 nfs4_state_mark_reclaim_nograce(clp, state);
1110 nfs4_schedule_state_manager(clp);
1113 void nfs_inode_find_state_and_recover(struct inode *inode,
1114 const nfs4_stateid *stateid)
1116 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1117 struct nfs_inode *nfsi = NFS_I(inode);
1118 struct nfs_open_context *ctx;
1119 struct nfs4_state *state;
1122 spin_lock(&inode->i_lock);
1123 list_for_each_entry(ctx, &nfsi->open_files, list) {
1127 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1129 if (!nfs4_stateid_match(&state->stateid, stateid))
1131 nfs4_state_mark_reclaim_nograce(clp, state);
1134 spin_unlock(&inode->i_lock);
1136 nfs4_schedule_state_manager(clp);
1140 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1142 struct inode *inode = state->inode;
1143 struct nfs_inode *nfsi = NFS_I(inode);
1144 struct file_lock *fl;
1147 if (inode->i_flock == NULL)
1150 /* Guard against delegation returns and new lock/unlock calls */
1151 down_write(&nfsi->rwsem);
1152 /* Protect inode->i_flock using the BKL */
1154 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1155 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1157 if (nfs_file_open_context(fl->fl_file)->state != state)
1160 status = ops->recover_lock(state, fl);
1165 case -NFS4ERR_ADMIN_REVOKED:
1166 case -NFS4ERR_STALE_STATEID:
1167 case -NFS4ERR_BAD_STATEID:
1168 case -NFS4ERR_EXPIRED:
1169 case -NFS4ERR_NO_GRACE:
1170 case -NFS4ERR_STALE_CLIENTID:
1171 case -NFS4ERR_BADSESSION:
1172 case -NFS4ERR_BADSLOT:
1173 case -NFS4ERR_BAD_HIGH_SLOT:
1174 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1177 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1178 "Zeroing state\n", __func__, status);
1180 case -NFS4ERR_DENIED:
1181 case -NFS4ERR_RECLAIM_BAD:
1182 case -NFS4ERR_RECLAIM_CONFLICT:
1183 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1190 up_write(&nfsi->rwsem);
1194 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1196 struct nfs4_state *state;
1197 struct nfs4_lock_state *lock;
1200 /* Note: we rely on the sp->so_states list being ordered
1201 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1203 * This is needed to ensure that the server won't give us any
1204 * read delegations that we have to return if, say, we are
1205 * recovering after a network partition or a reboot from a
1206 * server that doesn't support a grace period.
1209 spin_lock(&sp->so_lock);
1210 list_for_each_entry(state, &sp->so_states, open_states) {
1211 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1213 if (state->state == 0)
1215 atomic_inc(&state->count);
1216 spin_unlock(&sp->so_lock);
1217 status = ops->recover_open(sp, state);
1219 status = nfs4_reclaim_locks(state, ops);
1221 spin_lock(&state->state_lock);
1222 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1223 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1224 printk("NFS: %s: Lock reclaim "
1225 "failed!\n", __func__);
1227 spin_unlock(&state->state_lock);
1228 nfs4_put_open_state(state);
1234 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1235 "Zeroing state\n", __func__, status);
1240 * Open state on this file cannot be recovered
1241 * All we can do is revert to using the zero stateid.
1243 memset(state->stateid.data, 0,
1244 sizeof(state->stateid.data));
1245 /* Mark the file as being 'closed' */
1250 * User RPCSEC_GSS context has expired.
1251 * We cannot recover this stateid now, so
1252 * skip it and allow recovery thread to
1256 case -NFS4ERR_ADMIN_REVOKED:
1257 case -NFS4ERR_STALE_STATEID:
1258 case -NFS4ERR_BAD_STATEID:
1259 case -NFS4ERR_RECLAIM_BAD:
1260 case -NFS4ERR_RECLAIM_CONFLICT:
1261 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1263 case -NFS4ERR_EXPIRED:
1264 case -NFS4ERR_NO_GRACE:
1265 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1266 case -NFS4ERR_STALE_CLIENTID:
1267 case -NFS4ERR_BADSESSION:
1268 case -NFS4ERR_BADSLOT:
1269 case -NFS4ERR_BAD_HIGH_SLOT:
1270 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1273 nfs4_put_open_state(state);
1276 spin_unlock(&sp->so_lock);
1279 nfs4_put_open_state(state);
1283 static void nfs4_clear_open_state(struct nfs4_state *state)
1285 struct nfs4_lock_state *lock;
1287 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1288 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1289 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1290 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1291 spin_lock(&state->state_lock);
1292 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1293 lock->ls_seqid.flags = 0;
1294 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1296 spin_unlock(&state->state_lock);
1299 static void nfs4_reset_seqids(struct nfs_server *server,
1300 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1302 struct nfs_client *clp = server->nfs_client;
1303 struct nfs4_state_owner *sp;
1304 struct rb_node *pos;
1305 struct nfs4_state *state;
1307 spin_lock(&clp->cl_lock);
1308 for (pos = rb_first(&server->state_owners);
1310 pos = rb_next(pos)) {
1311 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1312 sp->so_seqid.flags = 0;
1313 spin_lock(&sp->so_lock);
1314 list_for_each_entry(state, &sp->so_states, open_states) {
1315 if (mark_reclaim(clp, state))
1316 nfs4_clear_open_state(state);
1318 spin_unlock(&sp->so_lock);
1320 spin_unlock(&clp->cl_lock);
1323 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1324 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1326 struct nfs_server *server;
1329 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1330 nfs4_reset_seqids(server, mark_reclaim);
1334 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1336 /* Mark all delegations for reclaim */
1337 nfs_delegation_mark_reclaim(clp);
1338 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1341 static void nfs4_reclaim_complete(struct nfs_client *clp,
1342 const struct nfs4_state_recovery_ops *ops)
1344 /* Notify the server we're done reclaiming our state */
1345 if (ops->reclaim_complete)
1346 (void)ops->reclaim_complete(clp);
1349 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1351 struct nfs_client *clp = server->nfs_client;
1352 struct nfs4_state_owner *sp;
1353 struct rb_node *pos;
1354 struct nfs4_state *state;
1356 spin_lock(&clp->cl_lock);
1357 for (pos = rb_first(&server->state_owners);
1359 pos = rb_next(pos)) {
1360 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1361 spin_lock(&sp->so_lock);
1362 list_for_each_entry(state, &sp->so_states, open_states) {
1363 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1366 nfs4_state_mark_reclaim_nograce(clp, state);
1368 spin_unlock(&sp->so_lock);
1370 spin_unlock(&clp->cl_lock);
1373 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1375 struct nfs_server *server;
1377 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1381 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1382 nfs4_clear_reclaim_server(server);
1385 nfs_delegation_reap_unclaimed(clp);
1389 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1391 if (!nfs4_state_clear_reclaim_reboot(clp))
1393 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1396 static void nfs_delegation_clear_all(struct nfs_client *clp)
1398 nfs_delegation_mark_reclaim(clp);
1399 nfs_delegation_reap_unclaimed(clp);
1402 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1404 nfs_delegation_clear_all(clp);
1405 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1408 static void nfs4_warn_keyexpired(const char *s)
1410 printk_ratelimited(KERN_WARNING "Error: state manager"
1411 " encountered RPCSEC_GSS session"
1412 " expired against NFSv4 server %s.\n",
1416 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1421 case -NFS4ERR_CB_PATH_DOWN:
1422 nfs_handle_cb_pathdown(clp);
1424 case -NFS4ERR_NO_GRACE:
1425 nfs4_state_end_reclaim_reboot(clp);
1427 case -NFS4ERR_STALE_CLIENTID:
1428 case -NFS4ERR_LEASE_MOVED:
1429 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1430 nfs4_state_clear_reclaim_reboot(clp);
1431 nfs4_state_start_reclaim_reboot(clp);
1433 case -NFS4ERR_EXPIRED:
1434 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1435 nfs4_state_start_reclaim_nograce(clp);
1437 case -NFS4ERR_BADSESSION:
1438 case -NFS4ERR_BADSLOT:
1439 case -NFS4ERR_BAD_HIGH_SLOT:
1440 case -NFS4ERR_DEADSESSION:
1441 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1442 case -NFS4ERR_SEQ_FALSE_RETRY:
1443 case -NFS4ERR_SEQ_MISORDERED:
1444 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1445 /* Zero session reset errors */
1448 /* Nothing we can do */
1449 nfs4_warn_keyexpired(clp->cl_hostname);
1457 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1459 struct nfs4_state_owner *sp;
1460 struct nfs_server *server;
1461 struct rb_node *pos;
1466 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1467 nfs4_purge_state_owners(server);
1468 spin_lock(&clp->cl_lock);
1469 for (pos = rb_first(&server->state_owners);
1471 pos = rb_next(pos)) {
1473 struct nfs4_state_owner, so_server_node);
1474 if (!test_and_clear_bit(ops->owner_flag_bit,
1477 atomic_inc(&sp->so_count);
1478 spin_unlock(&clp->cl_lock);
1481 status = nfs4_reclaim_open_state(sp, ops);
1483 set_bit(ops->owner_flag_bit, &sp->so_flags);
1484 nfs4_put_state_owner(sp);
1485 return nfs4_recovery_handle_error(clp, status);
1488 nfs4_put_state_owner(sp);
1491 spin_unlock(&clp->cl_lock);
1497 static int nfs4_check_lease(struct nfs_client *clp)
1499 struct rpc_cred *cred;
1500 const struct nfs4_state_maintenance_ops *ops =
1501 clp->cl_mvops->state_renewal_ops;
1504 /* Is the client already known to have an expired lease? */
1505 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1507 spin_lock(&clp->cl_lock);
1508 cred = ops->get_state_renewal_cred_locked(clp);
1509 spin_unlock(&clp->cl_lock);
1511 cred = nfs4_get_setclientid_cred(clp);
1516 status = ops->renew_lease(clp, cred);
1519 return nfs4_recovery_handle_error(clp, status);
1522 static int nfs4_reclaim_lease(struct nfs_client *clp)
1524 struct rpc_cred *cred;
1525 const struct nfs4_state_recovery_ops *ops =
1526 clp->cl_mvops->reboot_recovery_ops;
1527 int status = -ENOENT;
1529 cred = ops->get_clid_cred(clp);
1531 status = ops->establish_clid(clp, cred);
1533 /* Handle case where the user hasn't set up machine creds */
1534 if (status == -EACCES && cred == clp->cl_machine_cred) {
1535 nfs4_clear_machine_cred(clp);
1538 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1539 status = -EPROTONOSUPPORT;
1544 #ifdef CONFIG_NFS_V4_1
1545 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1547 struct nfs_client *clp = session->clp;
1549 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1550 nfs4_schedule_lease_recovery(clp);
1552 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1554 void nfs41_handle_recall_slot(struct nfs_client *clp)
1556 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1557 nfs4_schedule_state_manager(clp);
1560 static void nfs4_reset_all_state(struct nfs_client *clp)
1562 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1563 clp->cl_boot_time = CURRENT_TIME;
1564 nfs4_state_start_reclaim_nograce(clp);
1565 nfs4_schedule_state_manager(clp);
1569 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1571 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1572 nfs4_state_start_reclaim_reboot(clp);
1573 nfs4_schedule_state_manager(clp);
1577 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1580 nfs4_reset_all_state(clp);
1583 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1585 /* This will need to handle layouts too */
1586 nfs_expire_all_delegations(clp);
1589 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1591 nfs_expire_all_delegations(clp);
1592 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1593 nfs4_schedule_state_manager(clp);
1596 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1600 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1601 nfs41_handle_server_reboot(clp);
1602 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1603 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1604 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1605 SEQ4_STATUS_LEASE_MOVED))
1606 nfs41_handle_state_revoked(clp);
1607 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1608 nfs41_handle_recallable_state_revoked(clp);
1609 if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1610 SEQ4_STATUS_BACKCHANNEL_FAULT |
1611 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1612 nfs41_handle_cb_path_down(clp);
1615 static int nfs4_reset_session(struct nfs_client *clp)
1619 nfs4_begin_drain_session(clp);
1620 status = nfs4_proc_destroy_session(clp->cl_session);
1621 if (status && status != -NFS4ERR_BADSESSION &&
1622 status != -NFS4ERR_DEADSESSION) {
1623 status = nfs4_recovery_handle_error(clp, status);
1627 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1628 status = nfs4_proc_create_session(clp);
1630 status = nfs4_recovery_handle_error(clp, status);
1633 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1634 /* create_session negotiated new slot table */
1635 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1637 /* Let the state manager reestablish state */
1638 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1639 nfs41_setup_state_renewal(clp);
1644 static int nfs4_recall_slot(struct nfs_client *clp)
1646 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1647 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1648 struct nfs4_slot *new, *old;
1651 nfs4_begin_drain_session(clp);
1652 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1657 spin_lock(&fc_tbl->slot_tbl_lock);
1658 for (i = 0; i < fc_tbl->target_max_slots; i++)
1659 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1660 old = fc_tbl->slots;
1661 fc_tbl->slots = new;
1662 fc_tbl->max_slots = fc_tbl->target_max_slots;
1663 fc_tbl->target_max_slots = 0;
1664 fc_attrs->max_reqs = fc_tbl->max_slots;
1665 spin_unlock(&fc_tbl->slot_tbl_lock);
1668 nfs4_end_drain_session(clp);
1672 #else /* CONFIG_NFS_V4_1 */
1673 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1674 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1675 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1676 #endif /* CONFIG_NFS_V4_1 */
1678 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1679 * on EXCHANGE_ID for v4.1
1681 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1684 case -NFS4ERR_CLID_INUSE:
1685 case -NFS4ERR_STALE_CLIENTID:
1686 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1688 case -NFS4ERR_DELAY:
1695 nfs4_warn_keyexpired(clp->cl_hostname);
1696 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1697 * in nfs4_exchange_id */
1701 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1704 static void nfs4_state_manager(struct nfs_client *clp)
1708 /* Ensure exclusive access to NFSv4 state */
1710 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1711 /* We're going to have to re-establish a clientid */
1712 status = nfs4_reclaim_lease(clp);
1714 nfs4_set_lease_expired(clp, status);
1715 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1718 if (clp->cl_cons_state ==
1719 NFS_CS_SESSION_INITING)
1720 nfs_mark_client_ready(clp, status);
1723 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1725 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1727 nfs4_state_start_reclaim_nograce(clp);
1729 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1732 pnfs_destroy_all_layouts(clp);
1735 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1736 status = nfs4_check_lease(clp);
1739 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1743 /* Initialize or reset the session */
1744 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1745 && nfs4_has_session(clp)) {
1746 status = nfs4_reset_session(clp);
1747 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1753 /* First recover reboot state... */
1754 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1755 status = nfs4_do_reclaim(clp,
1756 clp->cl_mvops->reboot_recovery_ops);
1757 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1758 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1760 nfs4_state_end_reclaim_reboot(clp);
1761 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1767 /* Now recover expired state... */
1768 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1769 status = nfs4_do_reclaim(clp,
1770 clp->cl_mvops->nograce_recovery_ops);
1771 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1772 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1773 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1779 nfs4_end_drain_session(clp);
1780 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1781 nfs_client_return_marked_delegations(clp);
1784 /* Recall session slots */
1785 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1786 && nfs4_has_session(clp)) {
1787 status = nfs4_recall_slot(clp);
1794 nfs4_clear_state_manager_bit(clp);
1795 /* Did we race with an attempt to give us more work? */
1796 if (clp->cl_state == 0)
1798 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1800 } while (atomic_read(&clp->cl_count) > 1);
1803 printk(KERN_WARNING "NFS: state manager failed on NFSv4 server %s"
1804 " with error %d\n", clp->cl_hostname, -status);
1805 nfs4_end_drain_session(clp);
1806 nfs4_clear_state_manager_bit(clp);
1809 static int nfs4_run_state_manager(void *ptr)
1811 struct nfs_client *clp = ptr;
1813 allow_signal(SIGKILL);
1814 nfs4_state_manager(clp);
1815 nfs_put_client(clp);
1816 module_put_and_exit(0);