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>
55 #include "delegation.h"
59 #define OPENOWNER_POOL_SIZE 8
61 const nfs4_stateid zero_stateid;
63 static LIST_HEAD(nfs4_clientid_list);
65 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
67 struct nfs4_setclientid_res clid;
71 port = nfs_callback_tcpport;
72 if (clp->cl_addr.ss_family == AF_INET6)
73 port = nfs_callback_tcpport6;
75 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
78 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
81 clp->cl_clientid = clid.clientid;
82 nfs4_schedule_state_renewal(clp);
87 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
89 struct rpc_cred *cred = NULL;
91 if (clp->cl_machine_cred != NULL)
92 cred = get_rpccred(clp->cl_machine_cred);
96 static void nfs4_clear_machine_cred(struct nfs_client *clp)
98 struct rpc_cred *cred;
100 spin_lock(&clp->cl_lock);
101 cred = clp->cl_machine_cred;
102 clp->cl_machine_cred = NULL;
103 spin_unlock(&clp->cl_lock);
108 static struct rpc_cred *
109 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
111 struct rpc_cred *cred = NULL;
112 struct nfs4_state_owner *sp;
115 for (pos = rb_first(&server->state_owners);
117 pos = rb_next(pos)) {
118 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
119 if (list_empty(&sp->so_states))
121 cred = get_rpccred(sp->so_cred);
128 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
129 * @clp: client state handle
131 * Returns an rpc_cred with reference count bumped, or NULL.
132 * Caller must hold clp->cl_lock.
134 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
136 struct rpc_cred *cred = NULL;
137 struct nfs_server *server;
140 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
141 cred = nfs4_get_renew_cred_server_locked(server);
149 #if defined(CONFIG_NFS_V4_1)
151 static int nfs41_setup_state_renewal(struct nfs_client *clp)
154 struct nfs_fsinfo fsinfo;
156 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
157 nfs4_schedule_state_renewal(clp);
161 status = nfs4_proc_get_lease_time(clp, &fsinfo);
163 /* Update lease time and schedule renewal */
164 spin_lock(&clp->cl_lock);
165 clp->cl_lease_time = fsinfo.lease_time * HZ;
166 clp->cl_last_renewal = jiffies;
167 spin_unlock(&clp->cl_lock);
169 nfs4_schedule_state_renewal(clp);
176 * Back channel returns NFS4ERR_DELAY for new requests when
177 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
180 static void nfs4_end_drain_session(struct nfs_client *clp)
182 struct nfs4_session *ses = clp->cl_session;
187 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
188 spin_lock(&ses->fc_slot_table.slot_tbl_lock);
189 max_slots = ses->fc_slot_table.max_slots;
190 while (max_slots--) {
191 struct rpc_task *task;
193 task = rpc_wake_up_next(&ses->fc_slot_table.
197 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
199 spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
203 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
205 spin_lock(&tbl->slot_tbl_lock);
206 if (tbl->highest_used_slotid != -1) {
207 INIT_COMPLETION(tbl->complete);
208 spin_unlock(&tbl->slot_tbl_lock);
209 return wait_for_completion_interruptible(&tbl->complete);
211 spin_unlock(&tbl->slot_tbl_lock);
215 static int nfs4_begin_drain_session(struct nfs_client *clp)
217 struct nfs4_session *ses = clp->cl_session;
220 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
222 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
226 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
229 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
233 nfs4_begin_drain_session(clp);
234 status = nfs4_proc_exchange_id(clp, cred);
237 status = nfs4_proc_create_session(clp);
240 nfs41_setup_state_renewal(clp);
241 nfs_mark_client_ready(clp, NFS_CS_READY);
246 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
248 struct rpc_cred *cred;
250 spin_lock(&clp->cl_lock);
251 cred = nfs4_get_machine_cred_locked(clp);
252 spin_unlock(&clp->cl_lock);
256 #endif /* CONFIG_NFS_V4_1 */
258 static struct rpc_cred *
259 nfs4_get_setclientid_cred_server(struct nfs_server *server)
261 struct nfs_client *clp = server->nfs_client;
262 struct rpc_cred *cred = NULL;
263 struct nfs4_state_owner *sp;
266 spin_lock(&clp->cl_lock);
267 pos = rb_first(&server->state_owners);
269 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
270 cred = get_rpccred(sp->so_cred);
272 spin_unlock(&clp->cl_lock);
277 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
278 * @clp: client state handle
280 * Returns an rpc_cred with reference count bumped, or NULL.
282 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
284 struct nfs_server *server;
285 struct rpc_cred *cred;
287 spin_lock(&clp->cl_lock);
288 cred = nfs4_get_machine_cred_locked(clp);
289 spin_unlock(&clp->cl_lock);
294 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
295 cred = nfs4_get_setclientid_cred_server(server);
305 static void nfs_alloc_unique_id_locked(struct rb_root *root,
306 struct nfs_unique_id *new,
307 __u64 minval, int maxbits)
309 struct rb_node **p, *parent;
310 struct nfs_unique_id *pos;
314 mask = (1ULL << maxbits) - 1ULL;
316 /* Ensure distribution is more or less flat */
317 get_random_bytes(&new->id, sizeof(new->id));
319 if (new->id < minval)
327 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
329 if (new->id < pos->id)
331 else if (new->id > pos->id)
336 rb_link_node(&new->rb_node, parent, p);
337 rb_insert_color(&new->rb_node, root);
342 if (new->id < minval || (new->id & mask) != new->id) {
346 parent = rb_next(parent);
349 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
350 if (new->id < pos->id)
356 static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
358 rb_erase(&id->rb_node, root);
361 static struct nfs4_state_owner *
362 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
364 struct rb_node **p = &server->state_owners.rb_node,
366 struct nfs4_state_owner *sp, *res = NULL;
370 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
372 if (server < sp->so_server) {
373 p = &parent->rb_left;
376 if (server > sp->so_server) {
377 p = &parent->rb_right;
380 if (cred < sp->so_cred)
381 p = &parent->rb_left;
382 else if (cred > sp->so_cred)
383 p = &parent->rb_right;
385 atomic_inc(&sp->so_count);
393 static struct nfs4_state_owner *
394 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
396 struct nfs_server *server = new->so_server;
397 struct rb_node **p = &server->state_owners.rb_node,
399 struct nfs4_state_owner *sp;
403 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
405 if (new->so_cred < sp->so_cred)
406 p = &parent->rb_left;
407 else if (new->so_cred > sp->so_cred)
408 p = &parent->rb_right;
410 atomic_inc(&sp->so_count);
414 nfs_alloc_unique_id_locked(&server->openowner_id,
415 &new->so_owner_id, 1, 64);
416 rb_link_node(&new->so_server_node, parent, p);
417 rb_insert_color(&new->so_server_node, &server->state_owners);
422 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
424 struct nfs_server *server = sp->so_server;
426 if (!RB_EMPTY_NODE(&sp->so_server_node))
427 rb_erase(&sp->so_server_node, &server->state_owners);
428 nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id);
432 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
433 * create a new state_owner.
436 static struct nfs4_state_owner *
437 nfs4_alloc_state_owner(void)
439 struct nfs4_state_owner *sp;
441 sp = kzalloc(sizeof(*sp),GFP_NOFS);
444 spin_lock_init(&sp->so_lock);
445 INIT_LIST_HEAD(&sp->so_states);
446 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
447 sp->so_seqid.sequence = &sp->so_sequence;
448 spin_lock_init(&sp->so_sequence.lock);
449 INIT_LIST_HEAD(&sp->so_sequence.list);
450 atomic_set(&sp->so_count, 1);
455 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
457 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
458 struct nfs_server *server = sp->so_server;
459 struct nfs_client *clp = server->nfs_client;
461 spin_lock(&clp->cl_lock);
462 rb_erase(&sp->so_server_node, &server->state_owners);
463 RB_CLEAR_NODE(&sp->so_server_node);
464 spin_unlock(&clp->cl_lock);
469 * nfs4_get_state_owner - Look up a state owner given a credential
470 * @server: nfs_server to search
471 * @cred: RPC credential to match
473 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
475 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
476 struct rpc_cred *cred)
478 struct nfs_client *clp = server->nfs_client;
479 struct nfs4_state_owner *sp, *new;
481 spin_lock(&clp->cl_lock);
482 sp = nfs4_find_state_owner_locked(server, cred);
483 spin_unlock(&clp->cl_lock);
486 new = nfs4_alloc_state_owner();
489 new->so_server = server;
491 spin_lock(&clp->cl_lock);
492 sp = nfs4_insert_state_owner_locked(new);
493 spin_unlock(&clp->cl_lock);
497 rpc_destroy_wait_queue(&new->so_sequence.wait);
504 * nfs4_put_state_owner - Release a nfs4_state_owner
505 * @sp: state owner data to release
508 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
510 struct nfs_client *clp = sp->so_server->nfs_client;
511 struct rpc_cred *cred = sp->so_cred;
513 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
515 nfs4_remove_state_owner_locked(sp);
516 spin_unlock(&clp->cl_lock);
517 rpc_destroy_wait_queue(&sp->so_sequence.wait);
522 static struct nfs4_state *
523 nfs4_alloc_open_state(void)
525 struct nfs4_state *state;
527 state = kzalloc(sizeof(*state), GFP_NOFS);
530 atomic_set(&state->count, 1);
531 INIT_LIST_HEAD(&state->lock_states);
532 spin_lock_init(&state->state_lock);
533 seqlock_init(&state->seqlock);
538 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
540 if (state->state == fmode)
542 /* NB! List reordering - see the reclaim code for why. */
543 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
544 if (fmode & FMODE_WRITE)
545 list_move(&state->open_states, &state->owner->so_states);
547 list_move_tail(&state->open_states, &state->owner->so_states);
549 state->state = fmode;
552 static struct nfs4_state *
553 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
555 struct nfs_inode *nfsi = NFS_I(inode);
556 struct nfs4_state *state;
558 list_for_each_entry(state, &nfsi->open_states, inode_states) {
559 if (state->owner != owner)
561 if (atomic_inc_not_zero(&state->count))
568 nfs4_free_open_state(struct nfs4_state *state)
574 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
576 struct nfs4_state *state, *new;
577 struct nfs_inode *nfsi = NFS_I(inode);
579 spin_lock(&inode->i_lock);
580 state = __nfs4_find_state_byowner(inode, owner);
581 spin_unlock(&inode->i_lock);
584 new = nfs4_alloc_open_state();
585 spin_lock(&owner->so_lock);
586 spin_lock(&inode->i_lock);
587 state = __nfs4_find_state_byowner(inode, owner);
588 if (state == NULL && new != NULL) {
590 state->owner = owner;
591 atomic_inc(&owner->so_count);
592 list_add(&state->inode_states, &nfsi->open_states);
593 state->inode = igrab(inode);
594 spin_unlock(&inode->i_lock);
595 /* Note: The reclaim code dictates that we add stateless
596 * and read-only stateids to the end of the list */
597 list_add_tail(&state->open_states, &owner->so_states);
598 spin_unlock(&owner->so_lock);
600 spin_unlock(&inode->i_lock);
601 spin_unlock(&owner->so_lock);
603 nfs4_free_open_state(new);
609 void nfs4_put_open_state(struct nfs4_state *state)
611 struct inode *inode = state->inode;
612 struct nfs4_state_owner *owner = state->owner;
614 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
616 spin_lock(&inode->i_lock);
617 list_del(&state->inode_states);
618 list_del(&state->open_states);
619 spin_unlock(&inode->i_lock);
620 spin_unlock(&owner->so_lock);
622 nfs4_free_open_state(state);
623 nfs4_put_state_owner(owner);
627 * Close the current file.
629 static void __nfs4_close(struct path *path, struct nfs4_state *state,
630 fmode_t fmode, gfp_t gfp_mask, int wait)
632 struct nfs4_state_owner *owner = state->owner;
636 atomic_inc(&owner->so_count);
637 /* Protect against nfs4_find_state() */
638 spin_lock(&owner->so_lock);
639 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
646 case FMODE_READ|FMODE_WRITE:
649 newstate = FMODE_READ|FMODE_WRITE;
650 if (state->n_rdwr == 0) {
651 if (state->n_rdonly == 0) {
652 newstate &= ~FMODE_READ;
653 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
654 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
656 if (state->n_wronly == 0) {
657 newstate &= ~FMODE_WRITE;
658 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
659 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
662 clear_bit(NFS_DELEGATED_STATE, &state->flags);
664 nfs4_state_set_mode_locked(state, newstate);
665 spin_unlock(&owner->so_lock);
668 nfs4_put_open_state(state);
669 nfs4_put_state_owner(owner);
671 bool roc = pnfs_roc(state->inode);
673 nfs4_do_close(path, state, gfp_mask, wait, roc);
677 void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
679 __nfs4_close(path, state, fmode, GFP_NOFS, 0);
682 void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
684 __nfs4_close(path, state, fmode, GFP_KERNEL, 1);
688 * Search the state->lock_states for an existing lock_owner
689 * that is compatible with current->files
691 static struct nfs4_lock_state *
692 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
694 struct nfs4_lock_state *pos;
695 list_for_each_entry(pos, &state->lock_states, ls_locks) {
696 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
698 switch (pos->ls_owner.lo_type) {
699 case NFS4_POSIX_LOCK_TYPE:
700 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
703 case NFS4_FLOCK_LOCK_TYPE:
704 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
707 atomic_inc(&pos->ls_count);
714 * Return a compatible lock_state. If no initialized lock_state structure
715 * exists, return an uninitialized one.
718 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)
720 struct nfs4_lock_state *lsp;
721 struct nfs_server *server = state->owner->so_server;
722 struct nfs_client *clp = server->nfs_client;
724 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
727 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
728 spin_lock_init(&lsp->ls_sequence.lock);
729 INIT_LIST_HEAD(&lsp->ls_sequence.list);
730 lsp->ls_seqid.sequence = &lsp->ls_sequence;
731 atomic_set(&lsp->ls_count, 1);
732 lsp->ls_state = state;
733 lsp->ls_owner.lo_type = type;
734 switch (lsp->ls_owner.lo_type) {
735 case NFS4_FLOCK_LOCK_TYPE:
736 lsp->ls_owner.lo_u.flock_owner = fl_pid;
738 case NFS4_POSIX_LOCK_TYPE:
739 lsp->ls_owner.lo_u.posix_owner = fl_owner;
745 spin_lock(&clp->cl_lock);
746 nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64);
747 spin_unlock(&clp->cl_lock);
748 INIT_LIST_HEAD(&lsp->ls_locks);
752 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
754 struct nfs_server *server = lsp->ls_state->owner->so_server;
755 struct nfs_client *clp = server->nfs_client;
757 spin_lock(&clp->cl_lock);
758 nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id);
759 spin_unlock(&clp->cl_lock);
760 rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
765 * Return a compatible lock_state. If no initialized lock_state structure
766 * exists, return an uninitialized one.
769 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
771 struct nfs4_lock_state *lsp, *new = NULL;
774 spin_lock(&state->state_lock);
775 lsp = __nfs4_find_lock_state(state, owner, pid, type);
779 list_add(&new->ls_locks, &state->lock_states);
780 set_bit(LK_STATE_IN_USE, &state->flags);
785 spin_unlock(&state->state_lock);
786 new = nfs4_alloc_lock_state(state, owner, pid, type);
790 spin_unlock(&state->state_lock);
792 nfs4_free_lock_state(new);
797 * Release reference to lock_state, and free it if we see that
798 * it is no longer in use
800 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
802 struct nfs4_state *state;
806 state = lsp->ls_state;
807 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
809 list_del(&lsp->ls_locks);
810 if (list_empty(&state->lock_states))
811 clear_bit(LK_STATE_IN_USE, &state->flags);
812 spin_unlock(&state->state_lock);
813 if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
814 nfs4_release_lockowner(lsp);
815 nfs4_free_lock_state(lsp);
818 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
820 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
822 dst->fl_u.nfs4_fl.owner = lsp;
823 atomic_inc(&lsp->ls_count);
826 static void nfs4_fl_release_lock(struct file_lock *fl)
828 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
831 static const struct file_lock_operations nfs4_fl_lock_ops = {
832 .fl_copy_lock = nfs4_fl_copy_lock,
833 .fl_release_private = nfs4_fl_release_lock,
836 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
838 struct nfs4_lock_state *lsp;
840 if (fl->fl_ops != NULL)
842 if (fl->fl_flags & FL_POSIX)
843 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
844 else if (fl->fl_flags & FL_FLOCK)
845 lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
850 fl->fl_u.nfs4_fl.owner = lsp;
851 fl->fl_ops = &nfs4_fl_lock_ops;
856 * Byte-range lock aware utility to initialize the stateid of read/write
859 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
861 struct nfs4_lock_state *lsp;
865 seq = read_seqbegin(&state->seqlock);
866 memcpy(dst, &state->stateid, sizeof(*dst));
867 } while (read_seqretry(&state->seqlock, seq));
868 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
871 spin_lock(&state->state_lock);
872 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
873 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
874 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
875 spin_unlock(&state->state_lock);
876 nfs4_put_lock_state(lsp);
879 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
881 struct nfs_seqid *new;
883 new = kmalloc(sizeof(*new), gfp_mask);
885 new->sequence = counter;
886 INIT_LIST_HEAD(&new->list);
891 void nfs_release_seqid(struct nfs_seqid *seqid)
893 if (!list_empty(&seqid->list)) {
894 struct rpc_sequence *sequence = seqid->sequence->sequence;
896 spin_lock(&sequence->lock);
897 list_del_init(&seqid->list);
898 spin_unlock(&sequence->lock);
899 rpc_wake_up(&sequence->wait);
903 void nfs_free_seqid(struct nfs_seqid *seqid)
905 nfs_release_seqid(seqid);
910 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
911 * failed with a seqid incrementing error -
912 * see comments nfs_fs.h:seqid_mutating_error()
914 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
916 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
920 case -NFS4ERR_BAD_SEQID:
921 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
923 printk(KERN_WARNING "NFS: v4 server returned a bad"
924 " sequence-id error on an"
925 " unconfirmed sequence %p!\n",
927 case -NFS4ERR_STALE_CLIENTID:
928 case -NFS4ERR_STALE_STATEID:
929 case -NFS4ERR_BAD_STATEID:
930 case -NFS4ERR_BADXDR:
931 case -NFS4ERR_RESOURCE:
932 case -NFS4ERR_NOFILEHANDLE:
933 /* Non-seqid mutating errors */
937 * Note: no locking needed as we are guaranteed to be first
938 * on the sequence list
940 seqid->sequence->counter++;
943 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
945 struct nfs4_state_owner *sp = container_of(seqid->sequence,
946 struct nfs4_state_owner, so_seqid);
947 struct nfs_server *server = sp->so_server;
949 if (status == -NFS4ERR_BAD_SEQID)
950 nfs4_drop_state_owner(sp);
951 if (!nfs4_has_session(server->nfs_client))
952 nfs_increment_seqid(status, seqid);
956 * Increment the seqid if the LOCK/LOCKU succeeded, or
957 * failed with a seqid incrementing error -
958 * see comments nfs_fs.h:seqid_mutating_error()
960 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
962 nfs_increment_seqid(status, seqid);
965 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
967 struct rpc_sequence *sequence = seqid->sequence->sequence;
970 spin_lock(&sequence->lock);
971 if (list_empty(&seqid->list))
972 list_add_tail(&seqid->list, &sequence->list);
973 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
975 rpc_sleep_on(&sequence->wait, task, NULL);
978 spin_unlock(&sequence->lock);
982 static int nfs4_run_state_manager(void *);
984 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
986 smp_mb__before_clear_bit();
987 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
988 smp_mb__after_clear_bit();
989 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
990 rpc_wake_up(&clp->cl_rpcwaitq);
994 * Schedule the nfs_client asynchronous state management routine
996 void nfs4_schedule_state_manager(struct nfs_client *clp)
998 struct task_struct *task;
1000 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1002 __module_get(THIS_MODULE);
1003 atomic_inc(&clp->cl_count);
1004 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
1005 rpc_peeraddr2str(clp->cl_rpcclient,
1009 nfs4_clear_state_manager_bit(clp);
1010 nfs_put_client(clp);
1011 module_put(THIS_MODULE);
1015 * Schedule a lease recovery attempt
1017 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1021 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1022 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1023 nfs4_schedule_state_manager(clp);
1026 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1029 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1030 /* Don't recover state that expired before the reboot */
1031 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1032 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1035 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1036 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1040 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1042 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1043 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1044 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1045 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1049 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1051 struct nfs_client *clp = server->nfs_client;
1053 nfs4_state_mark_reclaim_nograce(clp, state);
1054 nfs4_schedule_state_manager(clp);
1057 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1059 struct inode *inode = state->inode;
1060 struct nfs_inode *nfsi = NFS_I(inode);
1061 struct file_lock *fl;
1064 if (inode->i_flock == NULL)
1067 /* Guard against delegation returns and new lock/unlock calls */
1068 down_write(&nfsi->rwsem);
1069 /* Protect inode->i_flock using the BKL */
1071 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1072 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1074 if (nfs_file_open_context(fl->fl_file)->state != state)
1077 status = ops->recover_lock(state, fl);
1082 case -NFS4ERR_ADMIN_REVOKED:
1083 case -NFS4ERR_STALE_STATEID:
1084 case -NFS4ERR_BAD_STATEID:
1085 case -NFS4ERR_EXPIRED:
1086 case -NFS4ERR_NO_GRACE:
1087 case -NFS4ERR_STALE_CLIENTID:
1088 case -NFS4ERR_BADSESSION:
1089 case -NFS4ERR_BADSLOT:
1090 case -NFS4ERR_BAD_HIGH_SLOT:
1091 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1094 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1097 case -NFS4ERR_DENIED:
1098 case -NFS4ERR_RECLAIM_BAD:
1099 case -NFS4ERR_RECLAIM_CONFLICT:
1100 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1107 up_write(&nfsi->rwsem);
1111 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1113 struct nfs4_state *state;
1114 struct nfs4_lock_state *lock;
1117 /* Note: we rely on the sp->so_states list being ordered
1118 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1120 * This is needed to ensure that the server won't give us any
1121 * read delegations that we have to return if, say, we are
1122 * recovering after a network partition or a reboot from a
1123 * server that doesn't support a grace period.
1126 spin_lock(&sp->so_lock);
1127 list_for_each_entry(state, &sp->so_states, open_states) {
1128 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1130 if (state->state == 0)
1132 atomic_inc(&state->count);
1133 spin_unlock(&sp->so_lock);
1134 status = ops->recover_open(sp, state);
1136 status = nfs4_reclaim_locks(state, ops);
1138 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1139 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1140 printk("%s: Lock reclaim failed!\n",
1143 nfs4_put_open_state(state);
1149 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1155 * Open state on this file cannot be recovered
1156 * All we can do is revert to using the zero stateid.
1158 memset(state->stateid.data, 0,
1159 sizeof(state->stateid.data));
1160 /* Mark the file as being 'closed' */
1165 * User RPCSEC_GSS context has expired.
1166 * We cannot recover this stateid now, so
1167 * skip it and allow recovery thread to
1171 case -NFS4ERR_ADMIN_REVOKED:
1172 case -NFS4ERR_STALE_STATEID:
1173 case -NFS4ERR_BAD_STATEID:
1174 case -NFS4ERR_RECLAIM_BAD:
1175 case -NFS4ERR_RECLAIM_CONFLICT:
1176 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1178 case -NFS4ERR_EXPIRED:
1179 case -NFS4ERR_NO_GRACE:
1180 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1181 case -NFS4ERR_STALE_CLIENTID:
1182 case -NFS4ERR_BADSESSION:
1183 case -NFS4ERR_BADSLOT:
1184 case -NFS4ERR_BAD_HIGH_SLOT:
1185 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1188 nfs4_put_open_state(state);
1191 spin_unlock(&sp->so_lock);
1194 nfs4_put_open_state(state);
1198 static void nfs4_clear_open_state(struct nfs4_state *state)
1200 struct nfs4_lock_state *lock;
1202 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1203 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1204 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1205 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1206 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1207 lock->ls_seqid.flags = 0;
1208 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1212 static void nfs4_reset_seqids(struct nfs_server *server,
1213 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1215 struct nfs_client *clp = server->nfs_client;
1216 struct nfs4_state_owner *sp;
1217 struct rb_node *pos;
1218 struct nfs4_state *state;
1220 spin_lock(&clp->cl_lock);
1221 for (pos = rb_first(&server->state_owners);
1223 pos = rb_next(pos)) {
1224 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1225 sp->so_seqid.flags = 0;
1226 spin_lock(&sp->so_lock);
1227 list_for_each_entry(state, &sp->so_states, open_states) {
1228 if (mark_reclaim(clp, state))
1229 nfs4_clear_open_state(state);
1231 spin_unlock(&sp->so_lock);
1233 spin_unlock(&clp->cl_lock);
1236 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1237 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1239 struct nfs_server *server;
1242 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1243 nfs4_reset_seqids(server, mark_reclaim);
1247 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1249 /* Mark all delegations for reclaim */
1250 nfs_delegation_mark_reclaim(clp);
1251 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1254 static void nfs4_reclaim_complete(struct nfs_client *clp,
1255 const struct nfs4_state_recovery_ops *ops)
1257 /* Notify the server we're done reclaiming our state */
1258 if (ops->reclaim_complete)
1259 (void)ops->reclaim_complete(clp);
1262 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1264 struct nfs_client *clp = server->nfs_client;
1265 struct nfs4_state_owner *sp;
1266 struct rb_node *pos;
1267 struct nfs4_state *state;
1269 spin_lock(&clp->cl_lock);
1270 for (pos = rb_first(&server->state_owners);
1272 pos = rb_next(pos)) {
1273 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1274 spin_lock(&sp->so_lock);
1275 list_for_each_entry(state, &sp->so_states, open_states) {
1276 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1279 nfs4_state_mark_reclaim_nograce(clp, state);
1281 spin_unlock(&sp->so_lock);
1283 spin_unlock(&clp->cl_lock);
1286 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1288 struct nfs_server *server;
1290 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1294 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1295 nfs4_clear_reclaim_server(server);
1298 nfs_delegation_reap_unclaimed(clp);
1302 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1304 if (!nfs4_state_clear_reclaim_reboot(clp))
1306 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1309 static void nfs_delegation_clear_all(struct nfs_client *clp)
1311 nfs_delegation_mark_reclaim(clp);
1312 nfs_delegation_reap_unclaimed(clp);
1315 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1317 nfs_delegation_clear_all(clp);
1318 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1321 static void nfs4_warn_keyexpired(const char *s)
1323 printk_ratelimited(KERN_WARNING "Error: state manager"
1324 " encountered RPCSEC_GSS session"
1325 " expired against NFSv4 server %s.\n",
1329 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1332 case -NFS4ERR_CB_PATH_DOWN:
1333 nfs_handle_cb_pathdown(clp);
1335 case -NFS4ERR_NO_GRACE:
1336 nfs4_state_end_reclaim_reboot(clp);
1338 case -NFS4ERR_STALE_CLIENTID:
1339 case -NFS4ERR_LEASE_MOVED:
1340 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1341 nfs4_state_clear_reclaim_reboot(clp);
1342 nfs4_state_start_reclaim_reboot(clp);
1344 case -NFS4ERR_EXPIRED:
1345 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1346 nfs4_state_start_reclaim_nograce(clp);
1348 case -NFS4ERR_BADSESSION:
1349 case -NFS4ERR_BADSLOT:
1350 case -NFS4ERR_BAD_HIGH_SLOT:
1351 case -NFS4ERR_DEADSESSION:
1352 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1353 case -NFS4ERR_SEQ_FALSE_RETRY:
1354 case -NFS4ERR_SEQ_MISORDERED:
1355 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1356 /* Zero session reset errors */
1359 /* Nothing we can do */
1360 nfs4_warn_keyexpired(clp->cl_hostname);
1366 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1368 struct nfs4_state_owner *sp;
1369 struct nfs_server *server;
1370 struct rb_node *pos;
1375 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1376 spin_lock(&clp->cl_lock);
1377 for (pos = rb_first(&server->state_owners);
1379 pos = rb_next(pos)) {
1381 struct nfs4_state_owner, so_server_node);
1382 if (!test_and_clear_bit(ops->owner_flag_bit,
1385 atomic_inc(&sp->so_count);
1386 spin_unlock(&clp->cl_lock);
1389 status = nfs4_reclaim_open_state(sp, ops);
1391 set_bit(ops->owner_flag_bit, &sp->so_flags);
1392 nfs4_put_state_owner(sp);
1393 return nfs4_recovery_handle_error(clp, status);
1396 nfs4_put_state_owner(sp);
1399 spin_unlock(&clp->cl_lock);
1405 static int nfs4_check_lease(struct nfs_client *clp)
1407 struct rpc_cred *cred;
1408 const struct nfs4_state_maintenance_ops *ops =
1409 clp->cl_mvops->state_renewal_ops;
1410 int status = -NFS4ERR_EXPIRED;
1412 /* Is the client already known to have an expired lease? */
1413 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1415 spin_lock(&clp->cl_lock);
1416 cred = ops->get_state_renewal_cred_locked(clp);
1417 spin_unlock(&clp->cl_lock);
1419 cred = nfs4_get_setclientid_cred(clp);
1423 status = ops->renew_lease(clp, cred);
1426 return nfs4_recovery_handle_error(clp, status);
1429 static int nfs4_reclaim_lease(struct nfs_client *clp)
1431 struct rpc_cred *cred;
1432 const struct nfs4_state_recovery_ops *ops =
1433 clp->cl_mvops->reboot_recovery_ops;
1434 int status = -ENOENT;
1436 cred = ops->get_clid_cred(clp);
1438 status = ops->establish_clid(clp, cred);
1440 /* Handle case where the user hasn't set up machine creds */
1441 if (status == -EACCES && cred == clp->cl_machine_cred) {
1442 nfs4_clear_machine_cred(clp);
1445 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1446 status = -EPROTONOSUPPORT;
1451 #ifdef CONFIG_NFS_V4_1
1452 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1454 nfs4_schedule_lease_recovery(session->clp);
1457 void nfs41_handle_recall_slot(struct nfs_client *clp)
1459 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1460 nfs4_schedule_state_manager(clp);
1463 static void nfs4_reset_all_state(struct nfs_client *clp)
1465 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1466 clp->cl_boot_time = CURRENT_TIME;
1467 nfs4_state_start_reclaim_nograce(clp);
1468 nfs4_schedule_state_manager(clp);
1472 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1474 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1475 nfs4_state_start_reclaim_reboot(clp);
1476 nfs4_schedule_state_manager(clp);
1480 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1483 nfs4_reset_all_state(clp);
1486 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1488 /* This will need to handle layouts too */
1489 nfs_expire_all_delegations(clp);
1492 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1494 nfs_expire_all_delegations(clp);
1495 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1496 nfs4_schedule_state_manager(clp);
1499 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1503 else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1504 nfs41_handle_server_reboot(clp);
1505 else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1506 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1507 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1508 SEQ4_STATUS_LEASE_MOVED))
1509 nfs41_handle_state_revoked(clp);
1510 else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1511 nfs41_handle_recallable_state_revoked(clp);
1512 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1513 SEQ4_STATUS_BACKCHANNEL_FAULT |
1514 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1515 nfs41_handle_cb_path_down(clp);
1518 static int nfs4_reset_session(struct nfs_client *clp)
1522 nfs4_begin_drain_session(clp);
1523 status = nfs4_proc_destroy_session(clp->cl_session);
1524 if (status && status != -NFS4ERR_BADSESSION &&
1525 status != -NFS4ERR_DEADSESSION) {
1526 status = nfs4_recovery_handle_error(clp, status);
1530 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1531 status = nfs4_proc_create_session(clp);
1533 status = nfs4_recovery_handle_error(clp, status);
1536 /* create_session negotiated new slot table */
1537 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1539 /* Let the state manager reestablish state */
1540 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1541 nfs41_setup_state_renewal(clp);
1546 static int nfs4_recall_slot(struct nfs_client *clp)
1548 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1549 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1550 struct nfs4_slot *new, *old;
1553 nfs4_begin_drain_session(clp);
1554 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1559 spin_lock(&fc_tbl->slot_tbl_lock);
1560 for (i = 0; i < fc_tbl->target_max_slots; i++)
1561 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1562 old = fc_tbl->slots;
1563 fc_tbl->slots = new;
1564 fc_tbl->max_slots = fc_tbl->target_max_slots;
1565 fc_tbl->target_max_slots = 0;
1566 fc_attrs->max_reqs = fc_tbl->max_slots;
1567 spin_unlock(&fc_tbl->slot_tbl_lock);
1570 nfs4_end_drain_session(clp);
1574 #else /* CONFIG_NFS_V4_1 */
1575 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1576 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1577 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1578 #endif /* CONFIG_NFS_V4_1 */
1580 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1581 * on EXCHANGE_ID for v4.1
1583 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1585 if (nfs4_has_session(clp)) {
1587 case -NFS4ERR_DELAY:
1588 case -NFS4ERR_CLID_INUSE:
1593 nfs4_warn_keyexpired(clp->cl_hostname);
1594 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1595 * in nfs4_exchange_id */
1600 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1603 static void nfs4_state_manager(struct nfs_client *clp)
1607 /* Ensure exclusive access to NFSv4 state */
1609 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1610 /* We're going to have to re-establish a clientid */
1611 status = nfs4_reclaim_lease(clp);
1613 nfs4_set_lease_expired(clp, status);
1614 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1617 if (clp->cl_cons_state ==
1618 NFS_CS_SESSION_INITING)
1619 nfs_mark_client_ready(clp, status);
1622 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1623 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1624 pnfs_destroy_all_layouts(clp);
1627 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1628 status = nfs4_check_lease(clp);
1629 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1631 if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1635 /* Initialize or reset the session */
1636 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1637 && nfs4_has_session(clp)) {
1638 status = nfs4_reset_session(clp);
1639 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1645 /* First recover reboot state... */
1646 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1647 status = nfs4_do_reclaim(clp,
1648 clp->cl_mvops->reboot_recovery_ops);
1649 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1650 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1652 nfs4_state_end_reclaim_reboot(clp);
1653 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1659 /* Now recover expired state... */
1660 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1661 status = nfs4_do_reclaim(clp,
1662 clp->cl_mvops->nograce_recovery_ops);
1663 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1664 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1665 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1671 nfs4_end_drain_session(clp);
1672 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1673 nfs_client_return_marked_delegations(clp);
1676 /* Recall session slots */
1677 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1678 && nfs4_has_session(clp)) {
1679 status = nfs4_recall_slot(clp);
1686 nfs4_clear_state_manager_bit(clp);
1687 /* Did we race with an attempt to give us more work? */
1688 if (clp->cl_state == 0)
1690 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1695 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1696 " with error %d\n", clp->cl_hostname, -status);
1697 nfs4_end_drain_session(clp);
1698 nfs4_clear_state_manager_bit(clp);
1701 static int nfs4_run_state_manager(void *ptr)
1703 struct nfs_client *clp = ptr;
1705 allow_signal(SIGKILL);
1706 nfs4_state_manager(clp);
1707 nfs_put_client(clp);
1708 module_put_and_exit(0);