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;
149 /* Use machine credentials if available */
150 cred = nfs4_get_machine_cred_locked(clp);
155 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
156 cred = nfs4_get_renew_cred_server_locked(server);
166 #if defined(CONFIG_NFS_V4_1)
168 static int nfs41_setup_state_renewal(struct nfs_client *clp)
171 struct nfs_fsinfo fsinfo;
173 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
174 nfs4_schedule_state_renewal(clp);
178 status = nfs4_proc_get_lease_time(clp, &fsinfo);
180 /* Update lease time and schedule renewal */
181 spin_lock(&clp->cl_lock);
182 clp->cl_lease_time = fsinfo.lease_time * HZ;
183 clp->cl_last_renewal = jiffies;
184 spin_unlock(&clp->cl_lock);
186 nfs4_schedule_state_renewal(clp);
193 * Back channel returns NFS4ERR_DELAY for new requests when
194 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
197 static void nfs4_end_drain_session(struct nfs_client *clp)
199 struct nfs4_session *ses = clp->cl_session;
200 struct nfs4_slot_table *tbl;
205 tbl = &ses->fc_slot_table;
206 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
207 spin_lock(&tbl->slot_tbl_lock);
208 max_slots = tbl->max_slots;
209 while (max_slots--) {
210 if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
211 nfs4_set_task_privileged,
215 spin_unlock(&tbl->slot_tbl_lock);
219 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
221 spin_lock(&tbl->slot_tbl_lock);
222 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
223 INIT_COMPLETION(tbl->complete);
224 spin_unlock(&tbl->slot_tbl_lock);
225 return wait_for_completion_interruptible(&tbl->complete);
227 spin_unlock(&tbl->slot_tbl_lock);
231 static int nfs4_begin_drain_session(struct nfs_client *clp)
233 struct nfs4_session *ses = clp->cl_session;
236 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
238 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
242 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
245 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
249 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
251 nfs4_begin_drain_session(clp);
252 status = nfs4_proc_exchange_id(clp, cred);
255 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
257 status = nfs4_proc_create_session(clp);
260 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
261 nfs41_setup_state_renewal(clp);
262 nfs_mark_client_ready(clp, NFS_CS_READY);
267 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
269 struct rpc_cred *cred;
271 spin_lock(&clp->cl_lock);
272 cred = nfs4_get_machine_cred_locked(clp);
273 spin_unlock(&clp->cl_lock);
277 #endif /* CONFIG_NFS_V4_1 */
279 static struct rpc_cred *
280 nfs4_get_setclientid_cred_server(struct nfs_server *server)
282 struct nfs_client *clp = server->nfs_client;
283 struct rpc_cred *cred = NULL;
284 struct nfs4_state_owner *sp;
287 spin_lock(&clp->cl_lock);
288 pos = rb_first(&server->state_owners);
290 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
291 cred = get_rpccred(sp->so_cred);
293 spin_unlock(&clp->cl_lock);
298 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
299 * @clp: client state handle
301 * Returns an rpc_cred with reference count bumped, or NULL.
303 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
305 struct nfs_server *server;
306 struct rpc_cred *cred;
308 spin_lock(&clp->cl_lock);
309 cred = nfs4_get_machine_cred_locked(clp);
310 spin_unlock(&clp->cl_lock);
315 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
316 cred = nfs4_get_setclientid_cred_server(server);
326 static struct nfs4_state_owner *
327 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
329 struct rb_node **p = &server->state_owners.rb_node,
331 struct nfs4_state_owner *sp;
335 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
337 if (cred < sp->so_cred)
338 p = &parent->rb_left;
339 else if (cred > sp->so_cred)
340 p = &parent->rb_right;
342 if (!list_empty(&sp->so_lru))
343 list_del_init(&sp->so_lru);
344 atomic_inc(&sp->so_count);
351 static struct nfs4_state_owner *
352 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
354 struct nfs_server *server = new->so_server;
355 struct rb_node **p = &server->state_owners.rb_node,
357 struct nfs4_state_owner *sp;
362 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
364 if (new->so_cred < sp->so_cred)
365 p = &parent->rb_left;
366 else if (new->so_cred > sp->so_cred)
367 p = &parent->rb_right;
369 if (!list_empty(&sp->so_lru))
370 list_del_init(&sp->so_lru);
371 atomic_inc(&sp->so_count);
375 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
378 rb_link_node(&new->so_server_node, parent, p);
379 rb_insert_color(&new->so_server_node, &server->state_owners);
384 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
386 struct nfs_server *server = sp->so_server;
388 if (!RB_EMPTY_NODE(&sp->so_server_node))
389 rb_erase(&sp->so_server_node, &server->state_owners);
390 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
394 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
398 spin_lock_init(&sc->lock);
399 INIT_LIST_HEAD(&sc->list);
400 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
404 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
406 rpc_destroy_wait_queue(&sc->wait);
410 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
411 * create a new state_owner.
414 static struct nfs4_state_owner *
415 nfs4_alloc_state_owner(struct nfs_server *server,
416 struct rpc_cred *cred,
419 struct nfs4_state_owner *sp;
421 sp = kzalloc(sizeof(*sp), gfp_flags);
424 sp->so_server = server;
425 sp->so_cred = get_rpccred(cred);
426 spin_lock_init(&sp->so_lock);
427 INIT_LIST_HEAD(&sp->so_states);
428 nfs4_init_seqid_counter(&sp->so_seqid);
429 atomic_set(&sp->so_count, 1);
430 INIT_LIST_HEAD(&sp->so_lru);
435 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
437 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
438 struct nfs_server *server = sp->so_server;
439 struct nfs_client *clp = server->nfs_client;
441 spin_lock(&clp->cl_lock);
442 rb_erase(&sp->so_server_node, &server->state_owners);
443 RB_CLEAR_NODE(&sp->so_server_node);
444 spin_unlock(&clp->cl_lock);
448 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
450 nfs4_destroy_seqid_counter(&sp->so_seqid);
451 put_rpccred(sp->so_cred);
455 static void nfs4_gc_state_owners(struct nfs_server *server)
457 struct nfs_client *clp = server->nfs_client;
458 struct nfs4_state_owner *sp, *tmp;
459 unsigned long time_min, time_max;
462 spin_lock(&clp->cl_lock);
464 time_min = (long)time_max - (long)clp->cl_lease_time;
465 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
466 /* NB: LRU is sorted so that oldest is at the head */
467 if (time_in_range(sp->so_expires, time_min, time_max))
469 list_move(&sp->so_lru, &doomed);
470 nfs4_remove_state_owner_locked(sp);
472 spin_unlock(&clp->cl_lock);
474 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
475 list_del(&sp->so_lru);
476 nfs4_free_state_owner(sp);
481 * nfs4_get_state_owner - Look up a state owner given a credential
482 * @server: nfs_server to search
483 * @cred: RPC credential to match
485 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
487 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
488 struct rpc_cred *cred,
491 struct nfs_client *clp = server->nfs_client;
492 struct nfs4_state_owner *sp, *new;
494 spin_lock(&clp->cl_lock);
495 sp = nfs4_find_state_owner_locked(server, cred);
496 spin_unlock(&clp->cl_lock);
499 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
503 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
505 spin_lock(&clp->cl_lock);
506 sp = nfs4_insert_state_owner_locked(new);
507 spin_unlock(&clp->cl_lock);
508 } while (sp == ERR_PTR(-EAGAIN));
510 nfs4_free_state_owner(new);
512 nfs4_gc_state_owners(server);
517 * nfs4_put_state_owner - Release a nfs4_state_owner
518 * @sp: state owner data to release
520 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
522 struct nfs_server *server = sp->so_server;
523 struct nfs_client *clp = server->nfs_client;
525 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
528 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
529 sp->so_expires = jiffies;
530 list_add_tail(&sp->so_lru, &server->state_owners_lru);
531 spin_unlock(&clp->cl_lock);
533 nfs4_remove_state_owner_locked(sp);
534 spin_unlock(&clp->cl_lock);
535 nfs4_free_state_owner(sp);
540 * nfs4_purge_state_owners - Release all cached state owners
541 * @server: nfs_server with cached state owners to release
543 * Called at umount time. Remaining state owners will be on
544 * the LRU with ref count of zero.
546 void nfs4_purge_state_owners(struct nfs_server *server)
548 struct nfs_client *clp = server->nfs_client;
549 struct nfs4_state_owner *sp, *tmp;
552 spin_lock(&clp->cl_lock);
553 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
554 list_move(&sp->so_lru, &doomed);
555 nfs4_remove_state_owner_locked(sp);
557 spin_unlock(&clp->cl_lock);
559 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
560 list_del(&sp->so_lru);
561 nfs4_free_state_owner(sp);
565 static struct nfs4_state *
566 nfs4_alloc_open_state(void)
568 struct nfs4_state *state;
570 state = kzalloc(sizeof(*state), GFP_NOFS);
573 atomic_set(&state->count, 1);
574 INIT_LIST_HEAD(&state->lock_states);
575 spin_lock_init(&state->state_lock);
576 seqlock_init(&state->seqlock);
581 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
583 if (state->state == fmode)
585 /* NB! List reordering - see the reclaim code for why. */
586 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
587 if (fmode & FMODE_WRITE)
588 list_move(&state->open_states, &state->owner->so_states);
590 list_move_tail(&state->open_states, &state->owner->so_states);
592 state->state = fmode;
595 static struct nfs4_state *
596 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
598 struct nfs_inode *nfsi = NFS_I(inode);
599 struct nfs4_state *state;
601 list_for_each_entry(state, &nfsi->open_states, inode_states) {
602 if (state->owner != owner)
604 if (atomic_inc_not_zero(&state->count))
611 nfs4_free_open_state(struct nfs4_state *state)
617 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
619 struct nfs4_state *state, *new;
620 struct nfs_inode *nfsi = NFS_I(inode);
622 spin_lock(&inode->i_lock);
623 state = __nfs4_find_state_byowner(inode, owner);
624 spin_unlock(&inode->i_lock);
627 new = nfs4_alloc_open_state();
628 spin_lock(&owner->so_lock);
629 spin_lock(&inode->i_lock);
630 state = __nfs4_find_state_byowner(inode, owner);
631 if (state == NULL && new != NULL) {
633 state->owner = owner;
634 atomic_inc(&owner->so_count);
635 list_add(&state->inode_states, &nfsi->open_states);
637 state->inode = inode;
638 spin_unlock(&inode->i_lock);
639 /* Note: The reclaim code dictates that we add stateless
640 * and read-only stateids to the end of the list */
641 list_add_tail(&state->open_states, &owner->so_states);
642 spin_unlock(&owner->so_lock);
644 spin_unlock(&inode->i_lock);
645 spin_unlock(&owner->so_lock);
647 nfs4_free_open_state(new);
653 void nfs4_put_open_state(struct nfs4_state *state)
655 struct inode *inode = state->inode;
656 struct nfs4_state_owner *owner = state->owner;
658 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
660 spin_lock(&inode->i_lock);
661 list_del(&state->inode_states);
662 list_del(&state->open_states);
663 spin_unlock(&inode->i_lock);
664 spin_unlock(&owner->so_lock);
666 nfs4_free_open_state(state);
667 nfs4_put_state_owner(owner);
671 * Close the current file.
673 static void __nfs4_close(struct nfs4_state *state,
674 fmode_t fmode, gfp_t gfp_mask, int wait)
676 struct nfs4_state_owner *owner = state->owner;
680 atomic_inc(&owner->so_count);
681 /* Protect against nfs4_find_state() */
682 spin_lock(&owner->so_lock);
683 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
690 case FMODE_READ|FMODE_WRITE:
693 newstate = FMODE_READ|FMODE_WRITE;
694 if (state->n_rdwr == 0) {
695 if (state->n_rdonly == 0) {
696 newstate &= ~FMODE_READ;
697 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
698 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
700 if (state->n_wronly == 0) {
701 newstate &= ~FMODE_WRITE;
702 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
703 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
706 clear_bit(NFS_DELEGATED_STATE, &state->flags);
708 nfs4_state_set_mode_locked(state, newstate);
709 spin_unlock(&owner->so_lock);
712 nfs4_put_open_state(state);
713 nfs4_put_state_owner(owner);
715 bool roc = pnfs_roc(state->inode);
717 nfs4_do_close(state, gfp_mask, wait, roc);
721 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
723 __nfs4_close(state, fmode, GFP_NOFS, 0);
726 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
728 __nfs4_close(state, fmode, GFP_KERNEL, 1);
732 * Search the state->lock_states for an existing lock_owner
733 * that is compatible with current->files
735 static struct nfs4_lock_state *
736 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
738 struct nfs4_lock_state *pos;
739 list_for_each_entry(pos, &state->lock_states, ls_locks) {
740 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
742 switch (pos->ls_owner.lo_type) {
743 case NFS4_POSIX_LOCK_TYPE:
744 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
747 case NFS4_FLOCK_LOCK_TYPE:
748 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
751 atomic_inc(&pos->ls_count);
758 * Return a compatible lock_state. If no initialized lock_state structure
759 * exists, return an uninitialized one.
762 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)
764 struct nfs4_lock_state *lsp;
765 struct nfs_server *server = state->owner->so_server;
767 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
770 nfs4_init_seqid_counter(&lsp->ls_seqid);
771 atomic_set(&lsp->ls_count, 1);
772 lsp->ls_state = state;
773 lsp->ls_owner.lo_type = type;
774 switch (lsp->ls_owner.lo_type) {
775 case NFS4_FLOCK_LOCK_TYPE:
776 lsp->ls_owner.lo_u.flock_owner = fl_pid;
778 case NFS4_POSIX_LOCK_TYPE:
779 lsp->ls_owner.lo_u.posix_owner = fl_owner;
784 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
785 if (lsp->ls_seqid.owner_id < 0)
787 INIT_LIST_HEAD(&lsp->ls_locks);
794 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
796 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
797 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
802 * Return a compatible lock_state. If no initialized lock_state structure
803 * exists, return an uninitialized one.
806 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
808 struct nfs4_lock_state *lsp, *new = NULL;
811 spin_lock(&state->state_lock);
812 lsp = __nfs4_find_lock_state(state, owner, pid, type);
816 list_add(&new->ls_locks, &state->lock_states);
817 set_bit(LK_STATE_IN_USE, &state->flags);
822 spin_unlock(&state->state_lock);
823 new = nfs4_alloc_lock_state(state, owner, pid, type);
827 spin_unlock(&state->state_lock);
829 nfs4_free_lock_state(state->owner->so_server, new);
834 * Release reference to lock_state, and free it if we see that
835 * it is no longer in use
837 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
839 struct nfs4_state *state;
843 state = lsp->ls_state;
844 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
846 list_del(&lsp->ls_locks);
847 if (list_empty(&state->lock_states))
848 clear_bit(LK_STATE_IN_USE, &state->flags);
849 spin_unlock(&state->state_lock);
850 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
851 if (nfs4_release_lockowner(lsp) == 0)
854 nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp);
857 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
859 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
861 dst->fl_u.nfs4_fl.owner = lsp;
862 atomic_inc(&lsp->ls_count);
865 static void nfs4_fl_release_lock(struct file_lock *fl)
867 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
870 static const struct file_lock_operations nfs4_fl_lock_ops = {
871 .fl_copy_lock = nfs4_fl_copy_lock,
872 .fl_release_private = nfs4_fl_release_lock,
875 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
877 struct nfs4_lock_state *lsp;
879 if (fl->fl_ops != NULL)
881 if (fl->fl_flags & FL_POSIX)
882 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
883 else if (fl->fl_flags & FL_FLOCK)
884 lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
885 NFS4_FLOCK_LOCK_TYPE);
890 fl->fl_u.nfs4_fl.owner = lsp;
891 fl->fl_ops = &nfs4_fl_lock_ops;
895 static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
896 fl_owner_t fl_owner, pid_t fl_pid)
898 struct nfs4_lock_state *lsp;
901 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
904 spin_lock(&state->state_lock);
905 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
906 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
907 nfs4_stateid_copy(dst, &lsp->ls_stateid);
910 spin_unlock(&state->state_lock);
911 nfs4_put_lock_state(lsp);
916 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
921 seq = read_seqbegin(&state->seqlock);
922 nfs4_stateid_copy(dst, &state->stateid);
923 } while (read_seqretry(&state->seqlock, seq));
927 * Byte-range lock aware utility to initialize the stateid of read/write
930 void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
931 fmode_t fmode, fl_owner_t fl_owner, pid_t fl_pid)
933 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
935 if (nfs4_copy_lock_stateid(dst, state, fl_owner, fl_pid))
937 nfs4_copy_open_stateid(dst, state);
940 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
942 struct nfs_seqid *new;
944 new = kmalloc(sizeof(*new), gfp_mask);
946 new->sequence = counter;
947 INIT_LIST_HEAD(&new->list);
953 void nfs_release_seqid(struct nfs_seqid *seqid)
955 struct nfs_seqid_counter *sequence;
957 if (list_empty(&seqid->list))
959 sequence = seqid->sequence;
960 spin_lock(&sequence->lock);
961 list_del_init(&seqid->list);
962 if (!list_empty(&sequence->list)) {
963 struct nfs_seqid *next;
965 next = list_first_entry(&sequence->list,
966 struct nfs_seqid, list);
967 rpc_wake_up_queued_task(&sequence->wait, next->task);
969 spin_unlock(&sequence->lock);
972 void nfs_free_seqid(struct nfs_seqid *seqid)
974 nfs_release_seqid(seqid);
979 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
980 * failed with a seqid incrementing error -
981 * see comments nfs_fs.h:seqid_mutating_error()
983 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
985 BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
989 case -NFS4ERR_BAD_SEQID:
990 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
992 pr_warn_ratelimited("NFS: v4 server returned a bad"
993 " sequence-id error on an"
994 " unconfirmed sequence %p!\n",
996 case -NFS4ERR_STALE_CLIENTID:
997 case -NFS4ERR_STALE_STATEID:
998 case -NFS4ERR_BAD_STATEID:
999 case -NFS4ERR_BADXDR:
1000 case -NFS4ERR_RESOURCE:
1001 case -NFS4ERR_NOFILEHANDLE:
1002 /* Non-seqid mutating errors */
1006 * Note: no locking needed as we are guaranteed to be first
1007 * on the sequence list
1009 seqid->sequence->counter++;
1012 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1014 struct nfs4_state_owner *sp = container_of(seqid->sequence,
1015 struct nfs4_state_owner, so_seqid);
1016 struct nfs_server *server = sp->so_server;
1018 if (status == -NFS4ERR_BAD_SEQID)
1019 nfs4_drop_state_owner(sp);
1020 if (!nfs4_has_session(server->nfs_client))
1021 nfs_increment_seqid(status, seqid);
1025 * Increment the seqid if the LOCK/LOCKU succeeded, or
1026 * failed with a seqid incrementing error -
1027 * see comments nfs_fs.h:seqid_mutating_error()
1029 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1031 nfs_increment_seqid(status, seqid);
1034 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1036 struct nfs_seqid_counter *sequence = seqid->sequence;
1039 spin_lock(&sequence->lock);
1041 if (list_empty(&seqid->list))
1042 list_add_tail(&seqid->list, &sequence->list);
1043 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1045 rpc_sleep_on(&sequence->wait, task, NULL);
1048 spin_unlock(&sequence->lock);
1052 static int nfs4_run_state_manager(void *);
1054 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1056 smp_mb__before_clear_bit();
1057 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1058 smp_mb__after_clear_bit();
1059 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1060 rpc_wake_up(&clp->cl_rpcwaitq);
1064 * Schedule the nfs_client asynchronous state management routine
1066 void nfs4_schedule_state_manager(struct nfs_client *clp)
1068 struct task_struct *task;
1069 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1071 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1073 __module_get(THIS_MODULE);
1074 atomic_inc(&clp->cl_count);
1076 /* The rcu_read_lock() is not strictly necessary, as the state
1077 * manager is the only thread that ever changes the rpc_xprt
1078 * after it's initialized. At this point, we're single threaded. */
1080 snprintf(buf, sizeof(buf), "%s-manager",
1081 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1083 task = kthread_run(nfs4_run_state_manager, clp, buf);
1085 printk(KERN_ERR "%s: kthread_run: %ld\n",
1086 __func__, PTR_ERR(task));
1087 nfs4_clear_state_manager_bit(clp);
1088 nfs_put_client(clp);
1089 module_put(THIS_MODULE);
1094 * Schedule a lease recovery attempt
1096 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1100 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1101 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1102 nfs4_schedule_state_manager(clp);
1104 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1107 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1108 * @clp: client to process
1110 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1111 * resend of the SETCLIENTID and hence re-establish the
1112 * callback channel. Then return all existing delegations.
1114 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1116 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1117 nfs_expire_all_delegations(clp);
1120 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1122 nfs40_handle_cb_pathdown(clp);
1123 nfs4_schedule_state_manager(clp);
1126 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1129 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1130 /* Don't recover state that expired before the reboot */
1131 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1132 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1135 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1136 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1140 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1142 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1143 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1144 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1145 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1149 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1151 struct nfs_client *clp = server->nfs_client;
1153 nfs4_state_mark_reclaim_nograce(clp, state);
1154 nfs4_schedule_state_manager(clp);
1156 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1158 void nfs_inode_find_state_and_recover(struct inode *inode,
1159 const nfs4_stateid *stateid)
1161 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1162 struct nfs_inode *nfsi = NFS_I(inode);
1163 struct nfs_open_context *ctx;
1164 struct nfs4_state *state;
1167 spin_lock(&inode->i_lock);
1168 list_for_each_entry(ctx, &nfsi->open_files, list) {
1172 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1174 if (!nfs4_stateid_match(&state->stateid, stateid))
1176 nfs4_state_mark_reclaim_nograce(clp, state);
1179 spin_unlock(&inode->i_lock);
1181 nfs4_schedule_state_manager(clp);
1185 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1187 struct inode *inode = state->inode;
1188 struct nfs_inode *nfsi = NFS_I(inode);
1189 struct file_lock *fl;
1192 if (inode->i_flock == NULL)
1195 /* Guard against delegation returns and new lock/unlock calls */
1196 down_write(&nfsi->rwsem);
1197 /* Protect inode->i_flock using the BKL */
1199 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1200 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1202 if (nfs_file_open_context(fl->fl_file)->state != state)
1205 status = ops->recover_lock(state, fl);
1210 case -NFS4ERR_ADMIN_REVOKED:
1211 case -NFS4ERR_STALE_STATEID:
1212 case -NFS4ERR_BAD_STATEID:
1213 case -NFS4ERR_EXPIRED:
1214 case -NFS4ERR_NO_GRACE:
1215 case -NFS4ERR_STALE_CLIENTID:
1216 case -NFS4ERR_BADSESSION:
1217 case -NFS4ERR_BADSLOT:
1218 case -NFS4ERR_BAD_HIGH_SLOT:
1219 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1222 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1223 "Zeroing state\n", __func__, status);
1225 case -NFS4ERR_DENIED:
1226 case -NFS4ERR_RECLAIM_BAD:
1227 case -NFS4ERR_RECLAIM_CONFLICT:
1228 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1235 up_write(&nfsi->rwsem);
1239 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1241 struct nfs4_state *state;
1242 struct nfs4_lock_state *lock;
1245 /* Note: we rely on the sp->so_states list being ordered
1246 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1248 * This is needed to ensure that the server won't give us any
1249 * read delegations that we have to return if, say, we are
1250 * recovering after a network partition or a reboot from a
1251 * server that doesn't support a grace period.
1254 spin_lock(&sp->so_lock);
1255 list_for_each_entry(state, &sp->so_states, open_states) {
1256 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1258 if (state->state == 0)
1260 atomic_inc(&state->count);
1261 spin_unlock(&sp->so_lock);
1262 status = ops->recover_open(sp, state);
1264 status = nfs4_reclaim_locks(state, ops);
1266 spin_lock(&state->state_lock);
1267 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1268 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1269 pr_warn_ratelimited("NFS: "
1271 "failed!\n", __func__);
1273 spin_unlock(&state->state_lock);
1274 nfs4_put_open_state(state);
1280 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1281 "Zeroing state\n", __func__, status);
1286 * Open state on this file cannot be recovered
1287 * All we can do is revert to using the zero stateid.
1289 memset(&state->stateid, 0,
1290 sizeof(state->stateid));
1291 /* Mark the file as being 'closed' */
1296 * User RPCSEC_GSS context has expired.
1297 * We cannot recover this stateid now, so
1298 * skip it and allow recovery thread to
1302 case -NFS4ERR_ADMIN_REVOKED:
1303 case -NFS4ERR_STALE_STATEID:
1304 case -NFS4ERR_BAD_STATEID:
1305 case -NFS4ERR_RECLAIM_BAD:
1306 case -NFS4ERR_RECLAIM_CONFLICT:
1307 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1309 case -NFS4ERR_EXPIRED:
1310 case -NFS4ERR_NO_GRACE:
1311 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1312 case -NFS4ERR_STALE_CLIENTID:
1313 case -NFS4ERR_BADSESSION:
1314 case -NFS4ERR_BADSLOT:
1315 case -NFS4ERR_BAD_HIGH_SLOT:
1316 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1319 nfs4_put_open_state(state);
1322 spin_unlock(&sp->so_lock);
1325 nfs4_put_open_state(state);
1329 static void nfs4_clear_open_state(struct nfs4_state *state)
1331 struct nfs4_lock_state *lock;
1333 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1334 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1335 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1336 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1337 spin_lock(&state->state_lock);
1338 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1339 lock->ls_seqid.flags = 0;
1340 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1342 spin_unlock(&state->state_lock);
1345 static void nfs4_reset_seqids(struct nfs_server *server,
1346 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
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 sp->so_seqid.flags = 0;
1359 spin_lock(&sp->so_lock);
1360 list_for_each_entry(state, &sp->so_states, open_states) {
1361 if (mark_reclaim(clp, state))
1362 nfs4_clear_open_state(state);
1364 spin_unlock(&sp->so_lock);
1366 spin_unlock(&clp->cl_lock);
1369 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1370 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1372 struct nfs_server *server;
1375 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1376 nfs4_reset_seqids(server, mark_reclaim);
1380 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1382 /* Mark all delegations for reclaim */
1383 nfs_delegation_mark_reclaim(clp);
1384 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1387 static void nfs4_reclaim_complete(struct nfs_client *clp,
1388 const struct nfs4_state_recovery_ops *ops)
1390 /* Notify the server we're done reclaiming our state */
1391 if (ops->reclaim_complete)
1392 (void)ops->reclaim_complete(clp);
1395 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1397 struct nfs_client *clp = server->nfs_client;
1398 struct nfs4_state_owner *sp;
1399 struct rb_node *pos;
1400 struct nfs4_state *state;
1402 spin_lock(&clp->cl_lock);
1403 for (pos = rb_first(&server->state_owners);
1405 pos = rb_next(pos)) {
1406 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1407 spin_lock(&sp->so_lock);
1408 list_for_each_entry(state, &sp->so_states, open_states) {
1409 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1412 nfs4_state_mark_reclaim_nograce(clp, state);
1414 spin_unlock(&sp->so_lock);
1416 spin_unlock(&clp->cl_lock);
1419 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1421 struct nfs_server *server;
1423 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1427 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1428 nfs4_clear_reclaim_server(server);
1431 nfs_delegation_reap_unclaimed(clp);
1435 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1437 if (!nfs4_state_clear_reclaim_reboot(clp))
1439 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1442 static void nfs_delegation_clear_all(struct nfs_client *clp)
1444 nfs_delegation_mark_reclaim(clp);
1445 nfs_delegation_reap_unclaimed(clp);
1448 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1450 nfs_delegation_clear_all(clp);
1451 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1454 static void nfs4_warn_keyexpired(const char *s)
1456 printk_ratelimited(KERN_WARNING "Error: state manager"
1457 " encountered RPCSEC_GSS session"
1458 " expired against NFSv4 server %s.\n",
1462 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1467 case -NFS4ERR_CB_PATH_DOWN:
1468 nfs40_handle_cb_pathdown(clp);
1470 case -NFS4ERR_NO_GRACE:
1471 nfs4_state_end_reclaim_reboot(clp);
1473 case -NFS4ERR_STALE_CLIENTID:
1474 case -NFS4ERR_LEASE_MOVED:
1475 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1476 nfs4_state_clear_reclaim_reboot(clp);
1477 nfs4_state_start_reclaim_reboot(clp);
1479 case -NFS4ERR_EXPIRED:
1480 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1481 nfs4_state_start_reclaim_nograce(clp);
1483 case -NFS4ERR_BADSESSION:
1484 case -NFS4ERR_BADSLOT:
1485 case -NFS4ERR_BAD_HIGH_SLOT:
1486 case -NFS4ERR_DEADSESSION:
1487 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1488 case -NFS4ERR_SEQ_FALSE_RETRY:
1489 case -NFS4ERR_SEQ_MISORDERED:
1490 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1491 /* Zero session reset errors */
1494 /* Nothing we can do */
1495 nfs4_warn_keyexpired(clp->cl_hostname);
1503 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1505 struct nfs4_state_owner *sp;
1506 struct nfs_server *server;
1507 struct rb_node *pos;
1512 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1513 nfs4_purge_state_owners(server);
1514 spin_lock(&clp->cl_lock);
1515 for (pos = rb_first(&server->state_owners);
1517 pos = rb_next(pos)) {
1519 struct nfs4_state_owner, so_server_node);
1520 if (!test_and_clear_bit(ops->owner_flag_bit,
1523 atomic_inc(&sp->so_count);
1524 spin_unlock(&clp->cl_lock);
1527 status = nfs4_reclaim_open_state(sp, ops);
1529 set_bit(ops->owner_flag_bit, &sp->so_flags);
1530 nfs4_put_state_owner(sp);
1531 return nfs4_recovery_handle_error(clp, status);
1534 nfs4_put_state_owner(sp);
1537 spin_unlock(&clp->cl_lock);
1543 static int nfs4_check_lease(struct nfs_client *clp)
1545 struct rpc_cred *cred;
1546 const struct nfs4_state_maintenance_ops *ops =
1547 clp->cl_mvops->state_renewal_ops;
1550 /* Is the client already known to have an expired lease? */
1551 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1553 spin_lock(&clp->cl_lock);
1554 cred = ops->get_state_renewal_cred_locked(clp);
1555 spin_unlock(&clp->cl_lock);
1557 cred = nfs4_get_setclientid_cred(clp);
1562 status = ops->renew_lease(clp, cred);
1565 return nfs4_recovery_handle_error(clp, status);
1568 static int nfs4_reclaim_lease(struct nfs_client *clp)
1570 struct rpc_cred *cred;
1571 const struct nfs4_state_recovery_ops *ops =
1572 clp->cl_mvops->reboot_recovery_ops;
1573 int status = -ENOENT;
1575 cred = ops->get_clid_cred(clp);
1577 status = ops->establish_clid(clp, cred);
1579 /* Handle case where the user hasn't set up machine creds */
1580 if (status == -EACCES && cred == clp->cl_machine_cred) {
1581 nfs4_clear_machine_cred(clp);
1584 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1585 status = -EPROTONOSUPPORT;
1590 #ifdef CONFIG_NFS_V4_1
1591 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1593 struct nfs_client *clp = session->clp;
1595 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1596 nfs4_schedule_lease_recovery(clp);
1598 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1600 void nfs41_handle_recall_slot(struct nfs_client *clp)
1602 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1603 nfs4_schedule_state_manager(clp);
1606 static void nfs4_reset_all_state(struct nfs_client *clp)
1608 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1609 clp->cl_boot_time = CURRENT_TIME;
1610 nfs4_state_start_reclaim_nograce(clp);
1611 nfs4_schedule_state_manager(clp);
1615 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1617 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1618 nfs4_state_start_reclaim_reboot(clp);
1619 nfs4_schedule_state_manager(clp);
1623 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1626 nfs4_reset_all_state(clp);
1629 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1631 /* This will need to handle layouts too */
1632 nfs_expire_all_delegations(clp);
1635 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1637 nfs_expire_all_delegations(clp);
1638 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1639 nfs4_schedule_state_manager(clp);
1642 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1646 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1647 nfs41_handle_server_reboot(clp);
1648 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1649 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1650 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1651 SEQ4_STATUS_LEASE_MOVED))
1652 nfs41_handle_state_revoked(clp);
1653 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1654 nfs41_handle_recallable_state_revoked(clp);
1655 if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1656 SEQ4_STATUS_BACKCHANNEL_FAULT |
1657 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1658 nfs41_handle_cb_path_down(clp);
1661 static int nfs4_reset_session(struct nfs_client *clp)
1665 nfs4_begin_drain_session(clp);
1666 status = nfs4_proc_destroy_session(clp->cl_session);
1667 if (status && status != -NFS4ERR_BADSESSION &&
1668 status != -NFS4ERR_DEADSESSION) {
1669 status = nfs4_recovery_handle_error(clp, status);
1673 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1674 status = nfs4_proc_create_session(clp);
1676 status = nfs4_recovery_handle_error(clp, status);
1679 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1680 /* create_session negotiated new slot table */
1681 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1683 /* Let the state manager reestablish state */
1684 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1685 nfs41_setup_state_renewal(clp);
1690 static int nfs4_recall_slot(struct nfs_client *clp)
1692 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1693 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1694 struct nfs4_slot *new, *old;
1697 nfs4_begin_drain_session(clp);
1698 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1703 spin_lock(&fc_tbl->slot_tbl_lock);
1704 for (i = 0; i < fc_tbl->target_max_slots; i++)
1705 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1706 old = fc_tbl->slots;
1707 fc_tbl->slots = new;
1708 fc_tbl->max_slots = fc_tbl->target_max_slots;
1709 fc_tbl->target_max_slots = 0;
1710 fc_attrs->max_reqs = fc_tbl->max_slots;
1711 spin_unlock(&fc_tbl->slot_tbl_lock);
1714 nfs4_end_drain_session(clp);
1718 #else /* CONFIG_NFS_V4_1 */
1719 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1720 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1721 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1722 #endif /* CONFIG_NFS_V4_1 */
1724 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1725 * on EXCHANGE_ID for v4.1
1727 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1730 case -NFS4ERR_CLID_INUSE:
1731 case -NFS4ERR_STALE_CLIENTID:
1732 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1734 case -NFS4ERR_DELAY:
1741 nfs4_warn_keyexpired(clp->cl_hostname);
1742 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1743 * in nfs4_exchange_id */
1747 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1750 static void nfs4_state_manager(struct nfs_client *clp)
1754 /* Ensure exclusive access to NFSv4 state */
1756 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1757 /* We're going to have to re-establish a clientid */
1758 status = nfs4_reclaim_lease(clp);
1760 nfs4_set_lease_expired(clp, status);
1761 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1764 if (clp->cl_cons_state ==
1765 NFS_CS_SESSION_INITING)
1766 nfs_mark_client_ready(clp, status);
1769 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1771 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1773 nfs4_state_start_reclaim_nograce(clp);
1775 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1778 pnfs_destroy_all_layouts(clp);
1781 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1782 status = nfs4_check_lease(clp);
1785 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1789 /* Initialize or reset the session */
1790 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1791 && nfs4_has_session(clp)) {
1792 status = nfs4_reset_session(clp);
1793 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1799 /* First recover reboot state... */
1800 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1801 status = nfs4_do_reclaim(clp,
1802 clp->cl_mvops->reboot_recovery_ops);
1803 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1804 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1806 nfs4_state_end_reclaim_reboot(clp);
1807 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1813 /* Now recover expired state... */
1814 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1815 status = nfs4_do_reclaim(clp,
1816 clp->cl_mvops->nograce_recovery_ops);
1817 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1818 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1819 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1825 nfs4_end_drain_session(clp);
1826 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1827 nfs_client_return_marked_delegations(clp);
1830 /* Recall session slots */
1831 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1832 && nfs4_has_session(clp)) {
1833 status = nfs4_recall_slot(clp);
1840 nfs4_clear_state_manager_bit(clp);
1841 /* Did we race with an attempt to give us more work? */
1842 if (clp->cl_state == 0)
1844 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1846 } while (atomic_read(&clp->cl_count) > 1);
1849 pr_warn_ratelimited("NFS: state manager failed on NFSv4 server %s"
1850 " with error %d\n", clp->cl_hostname, -status);
1851 nfs4_end_drain_session(clp);
1852 nfs4_clear_state_manager_bit(clp);
1855 static int nfs4_run_state_manager(void *ptr)
1857 struct nfs_client *clp = ptr;
1859 allow_signal(SIGKILL);
1860 nfs4_state_manager(clp);
1861 nfs_put_client(clp);
1862 module_put_and_exit(0);