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/slab.h>
42 #include <linux/smp_lock.h>
43 #include <linux/nfs_fs.h>
44 #include <linux/nfs_idmap.h>
45 #include <linux/kthread.h>
46 #include <linux/module.h>
47 #include <linux/workqueue.h>
48 #include <linux/bitops.h>
52 #include "delegation.h"
55 #define OPENOWNER_POOL_SIZE 8
57 const nfs4_stateid zero_stateid;
59 static LIST_HEAD(nfs4_clientid_list);
61 static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred)
63 int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK,
64 nfs_callback_tcpport, cred);
66 status = nfs4_proc_setclientid_confirm(clp, cred);
68 nfs4_schedule_state_renewal(clp);
73 nfs4_alloc_lockowner_id(struct nfs_client *clp)
75 return clp->cl_lockowner_id ++;
78 static struct nfs4_state_owner *
79 nfs4_client_grab_unused(struct nfs_client *clp, struct rpc_cred *cred)
81 struct nfs4_state_owner *sp = NULL;
83 if (!list_empty(&clp->cl_unused)) {
84 sp = list_entry(clp->cl_unused.next, struct nfs4_state_owner, so_list);
85 atomic_inc(&sp->so_count);
86 sp->so_cred = get_rpccred(cred);
87 list_move(&sp->so_list, &clp->cl_state_owners);
93 struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
95 struct nfs4_state_owner *sp;
96 struct rpc_cred *cred = NULL;
98 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
99 if (list_empty(&sp->so_states))
101 cred = get_rpccred(sp->so_cred);
107 static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
109 struct nfs4_state_owner *sp;
111 if (!list_empty(&clp->cl_state_owners)) {
112 sp = list_entry(clp->cl_state_owners.next,
113 struct nfs4_state_owner, so_list);
114 return get_rpccred(sp->so_cred);
119 static struct nfs4_state_owner *
120 nfs4_find_state_owner(struct nfs_client *clp, struct rpc_cred *cred)
122 struct nfs4_state_owner *sp, *res = NULL;
124 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
125 if (sp->so_cred != cred)
127 atomic_inc(&sp->so_count);
128 /* Move to the head of the list */
129 list_move(&sp->so_list, &clp->cl_state_owners);
137 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
138 * create a new state_owner.
141 static struct nfs4_state_owner *
142 nfs4_alloc_state_owner(void)
144 struct nfs4_state_owner *sp;
146 sp = kzalloc(sizeof(*sp),GFP_KERNEL);
149 spin_lock_init(&sp->so_lock);
150 INIT_LIST_HEAD(&sp->so_states);
151 INIT_LIST_HEAD(&sp->so_delegations);
152 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
153 sp->so_seqid.sequence = &sp->so_sequence;
154 spin_lock_init(&sp->so_sequence.lock);
155 INIT_LIST_HEAD(&sp->so_sequence.list);
156 atomic_set(&sp->so_count, 1);
161 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
163 struct nfs_client *clp = sp->so_client;
164 spin_lock(&clp->cl_lock);
165 list_del_init(&sp->so_list);
166 spin_unlock(&clp->cl_lock);
170 * Note: must be called with clp->cl_sem held in order to prevent races
171 * with reboot recovery!
173 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
175 struct nfs_client *clp = server->nfs_client;
176 struct nfs4_state_owner *sp, *new;
178 new = nfs4_alloc_state_owner();
179 spin_lock(&clp->cl_lock);
180 sp = nfs4_find_state_owner(clp, cred);
182 sp = nfs4_client_grab_unused(clp, cred);
183 if (sp == NULL && new != NULL) {
184 list_add(&new->so_list, &clp->cl_state_owners);
185 new->so_client = clp;
186 new->so_id = nfs4_alloc_lockowner_id(clp);
187 new->so_cred = get_rpccred(cred);
191 spin_unlock(&clp->cl_lock);
199 * Must be called with clp->cl_sem held in order to avoid races
200 * with state recovery...
202 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
204 struct nfs_client *clp = sp->so_client;
205 struct rpc_cred *cred = sp->so_cred;
207 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
209 if (clp->cl_nunused >= OPENOWNER_POOL_SIZE)
211 if (list_empty(&sp->so_list))
213 list_move(&sp->so_list, &clp->cl_unused);
215 spin_unlock(&clp->cl_lock);
220 list_del(&sp->so_list);
221 spin_unlock(&clp->cl_lock);
226 static struct nfs4_state *
227 nfs4_alloc_open_state(void)
229 struct nfs4_state *state;
231 state = kzalloc(sizeof(*state), GFP_KERNEL);
234 atomic_set(&state->count, 1);
235 INIT_LIST_HEAD(&state->lock_states);
236 spin_lock_init(&state->state_lock);
241 nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode)
243 if (state->state == mode)
245 /* NB! List reordering - see the reclaim code for why. */
246 if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
247 if (mode & FMODE_WRITE)
248 list_move(&state->open_states, &state->owner->so_states);
250 list_move_tail(&state->open_states, &state->owner->so_states);
253 list_del_init(&state->inode_states);
257 static struct nfs4_state *
258 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
260 struct nfs_inode *nfsi = NFS_I(inode);
261 struct nfs4_state *state;
263 list_for_each_entry(state, &nfsi->open_states, inode_states) {
264 /* Is this in the process of being freed? */
265 if (state->state == 0)
267 if (state->owner == owner) {
268 atomic_inc(&state->count);
276 nfs4_free_open_state(struct nfs4_state *state)
282 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
284 struct nfs4_state *state, *new;
285 struct nfs_inode *nfsi = NFS_I(inode);
287 spin_lock(&inode->i_lock);
288 state = __nfs4_find_state_byowner(inode, owner);
289 spin_unlock(&inode->i_lock);
292 new = nfs4_alloc_open_state();
293 spin_lock(&owner->so_lock);
294 spin_lock(&inode->i_lock);
295 state = __nfs4_find_state_byowner(inode, owner);
296 if (state == NULL && new != NULL) {
298 state->owner = owner;
299 atomic_inc(&owner->so_count);
300 list_add(&state->inode_states, &nfsi->open_states);
301 state->inode = igrab(inode);
302 spin_unlock(&inode->i_lock);
303 /* Note: The reclaim code dictates that we add stateless
304 * and read-only stateids to the end of the list */
305 list_add_tail(&state->open_states, &owner->so_states);
306 spin_unlock(&owner->so_lock);
308 spin_unlock(&inode->i_lock);
309 spin_unlock(&owner->so_lock);
311 nfs4_free_open_state(new);
318 * Beware! Caller must be holding exactly one
319 * reference to clp->cl_sem!
321 void nfs4_put_open_state(struct nfs4_state *state)
323 struct inode *inode = state->inode;
324 struct nfs4_state_owner *owner = state->owner;
326 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
328 spin_lock(&inode->i_lock);
329 if (!list_empty(&state->inode_states))
330 list_del(&state->inode_states);
331 list_del(&state->open_states);
332 spin_unlock(&inode->i_lock);
333 spin_unlock(&owner->so_lock);
335 nfs4_free_open_state(state);
336 nfs4_put_state_owner(owner);
340 * Close the current file.
342 void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
344 struct inode *inode = state->inode;
345 struct nfs4_state_owner *owner = state->owner;
346 int oldstate, newstate = 0;
348 atomic_inc(&owner->so_count);
349 /* Protect against nfs4_find_state() */
350 spin_lock(&owner->so_lock);
351 spin_lock(&inode->i_lock);
352 switch (mode & (FMODE_READ | FMODE_WRITE)) {
359 case FMODE_READ|FMODE_WRITE:
362 oldstate = newstate = state->state;
363 if (state->n_rdwr == 0) {
364 if (state->n_rdonly == 0)
365 newstate &= ~FMODE_READ;
366 if (state->n_wronly == 0)
367 newstate &= ~FMODE_WRITE;
369 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
370 nfs4_state_set_mode_locked(state, newstate);
373 spin_unlock(&inode->i_lock);
374 spin_unlock(&owner->so_lock);
376 if (oldstate == newstate) {
377 nfs4_put_open_state(state);
378 nfs4_put_state_owner(owner);
380 nfs4_do_close(path, state);
384 * Search the state->lock_states for an existing lock_owner
385 * that is compatible with current->files
387 static struct nfs4_lock_state *
388 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
390 struct nfs4_lock_state *pos;
391 list_for_each_entry(pos, &state->lock_states, ls_locks) {
392 if (pos->ls_owner != fl_owner)
394 atomic_inc(&pos->ls_count);
401 * Return a compatible lock_state. If no initialized lock_state structure
402 * exists, return an uninitialized one.
405 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
407 struct nfs4_lock_state *lsp;
408 struct nfs_client *clp = state->owner->so_client;
410 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
413 lsp->ls_seqid.sequence = &state->owner->so_sequence;
414 atomic_set(&lsp->ls_count, 1);
415 lsp->ls_owner = fl_owner;
416 spin_lock(&clp->cl_lock);
417 lsp->ls_id = nfs4_alloc_lockowner_id(clp);
418 spin_unlock(&clp->cl_lock);
419 INIT_LIST_HEAD(&lsp->ls_locks);
424 * Return a compatible lock_state. If no initialized lock_state structure
425 * exists, return an uninitialized one.
427 * The caller must be holding clp->cl_sem
429 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
431 struct nfs4_lock_state *lsp, *new = NULL;
434 spin_lock(&state->state_lock);
435 lsp = __nfs4_find_lock_state(state, owner);
439 new->ls_state = state;
440 list_add(&new->ls_locks, &state->lock_states);
441 set_bit(LK_STATE_IN_USE, &state->flags);
446 spin_unlock(&state->state_lock);
447 new = nfs4_alloc_lock_state(state, owner);
451 spin_unlock(&state->state_lock);
457 * Release reference to lock_state, and free it if we see that
458 * it is no longer in use
460 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
462 struct nfs4_state *state;
466 state = lsp->ls_state;
467 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
469 list_del(&lsp->ls_locks);
470 if (list_empty(&state->lock_states))
471 clear_bit(LK_STATE_IN_USE, &state->flags);
472 spin_unlock(&state->state_lock);
476 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
478 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
480 dst->fl_u.nfs4_fl.owner = lsp;
481 atomic_inc(&lsp->ls_count);
484 static void nfs4_fl_release_lock(struct file_lock *fl)
486 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
489 static struct file_lock_operations nfs4_fl_lock_ops = {
490 .fl_copy_lock = nfs4_fl_copy_lock,
491 .fl_release_private = nfs4_fl_release_lock,
494 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
496 struct nfs4_lock_state *lsp;
498 if (fl->fl_ops != NULL)
500 lsp = nfs4_get_lock_state(state, fl->fl_owner);
503 fl->fl_u.nfs4_fl.owner = lsp;
504 fl->fl_ops = &nfs4_fl_lock_ops;
509 * Byte-range lock aware utility to initialize the stateid of read/write
512 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
514 struct nfs4_lock_state *lsp;
516 memcpy(dst, &state->stateid, sizeof(*dst));
517 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
520 spin_lock(&state->state_lock);
521 lsp = __nfs4_find_lock_state(state, fl_owner);
522 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
523 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
524 spin_unlock(&state->state_lock);
525 nfs4_put_lock_state(lsp);
528 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
530 struct rpc_sequence *sequence = counter->sequence;
531 struct nfs_seqid *new;
533 new = kmalloc(sizeof(*new), GFP_KERNEL);
535 new->sequence = counter;
536 spin_lock(&sequence->lock);
537 list_add_tail(&new->list, &sequence->list);
538 spin_unlock(&sequence->lock);
543 void nfs_free_seqid(struct nfs_seqid *seqid)
545 struct rpc_sequence *sequence = seqid->sequence->sequence;
547 spin_lock(&sequence->lock);
548 list_del(&seqid->list);
549 spin_unlock(&sequence->lock);
550 rpc_wake_up(&sequence->wait);
555 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
556 * failed with a seqid incrementing error -
557 * see comments nfs_fs.h:seqid_mutating_error()
559 static inline void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
564 case -NFS4ERR_BAD_SEQID:
565 case -NFS4ERR_STALE_CLIENTID:
566 case -NFS4ERR_STALE_STATEID:
567 case -NFS4ERR_BAD_STATEID:
568 case -NFS4ERR_BADXDR:
569 case -NFS4ERR_RESOURCE:
570 case -NFS4ERR_NOFILEHANDLE:
571 /* Non-seqid mutating errors */
575 * Note: no locking needed as we are guaranteed to be first
576 * on the sequence list
578 seqid->sequence->counter++;
581 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
583 if (status == -NFS4ERR_BAD_SEQID) {
584 struct nfs4_state_owner *sp = container_of(seqid->sequence,
585 struct nfs4_state_owner, so_seqid);
586 nfs4_drop_state_owner(sp);
588 return nfs_increment_seqid(status, seqid);
592 * Increment the seqid if the LOCK/LOCKU succeeded, or
593 * failed with a seqid incrementing error -
594 * see comments nfs_fs.h:seqid_mutating_error()
596 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
598 return nfs_increment_seqid(status, seqid);
601 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
603 struct rpc_sequence *sequence = seqid->sequence->sequence;
606 if (sequence->list.next == &seqid->list)
608 spin_lock(&sequence->lock);
609 if (sequence->list.next != &seqid->list) {
610 rpc_sleep_on(&sequence->wait, task, NULL, NULL);
613 spin_unlock(&sequence->lock);
618 static int reclaimer(void *);
620 static inline void nfs4_clear_recover_bit(struct nfs_client *clp)
622 smp_mb__before_clear_bit();
623 clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state);
624 smp_mb__after_clear_bit();
625 wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER);
626 rpc_wake_up(&clp->cl_rpcwaitq);
630 * State recovery routine
632 static void nfs4_recover_state(struct nfs_client *clp)
634 struct task_struct *task;
636 __module_get(THIS_MODULE);
637 atomic_inc(&clp->cl_count);
638 task = kthread_run(reclaimer, clp, "%u.%u.%u.%u-reclaim",
639 NIPQUAD(clp->cl_addr.sin_addr));
642 nfs4_clear_recover_bit(clp);
644 module_put(THIS_MODULE);
648 * Schedule a state recovery attempt
650 void nfs4_schedule_state_recovery(struct nfs_client *clp)
654 if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
655 nfs4_recover_state(clp);
658 static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state)
660 struct inode *inode = state->inode;
661 struct file_lock *fl;
664 for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
665 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
667 if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state)
669 status = ops->recover_lock(state, fl);
674 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
675 __FUNCTION__, status);
676 case -NFS4ERR_EXPIRED:
677 case -NFS4ERR_NO_GRACE:
678 case -NFS4ERR_RECLAIM_BAD:
679 case -NFS4ERR_RECLAIM_CONFLICT:
680 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
682 case -NFS4ERR_STALE_CLIENTID:
691 static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp)
693 struct nfs4_state *state;
694 struct nfs4_lock_state *lock;
697 /* Note: we rely on the sp->so_states list being ordered
698 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
700 * This is needed to ensure that the server won't give us any
701 * read delegations that we have to return if, say, we are
702 * recovering after a network partition or a reboot from a
703 * server that doesn't support a grace period.
705 list_for_each_entry(state, &sp->so_states, open_states) {
706 if (state->state == 0)
708 status = ops->recover_open(sp, state);
710 status = nfs4_reclaim_locks(ops, state);
713 list_for_each_entry(lock, &state->lock_states, ls_locks) {
714 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
715 printk("%s: Lock reclaim failed!\n",
722 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
723 __FUNCTION__, status);
725 case -NFS4ERR_RECLAIM_BAD:
726 case -NFS4ERR_RECLAIM_CONFLICT:
728 * Open state on this file cannot be recovered
729 * All we can do is revert to using the zero stateid.
731 memset(state->stateid.data, 0,
732 sizeof(state->stateid.data));
733 /* Mark the file as being 'closed' */
736 case -NFS4ERR_EXPIRED:
737 case -NFS4ERR_NO_GRACE:
738 case -NFS4ERR_STALE_CLIENTID:
747 static void nfs4_state_mark_reclaim(struct nfs_client *clp)
749 struct nfs4_state_owner *sp;
750 struct nfs4_state *state;
751 struct nfs4_lock_state *lock;
753 /* Reset all sequence ids to zero */
754 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
755 sp->so_seqid.counter = 0;
756 sp->so_seqid.flags = 0;
757 spin_lock(&sp->so_lock);
758 list_for_each_entry(state, &sp->so_states, open_states) {
759 list_for_each_entry(lock, &state->lock_states, ls_locks) {
760 lock->ls_seqid.counter = 0;
761 lock->ls_seqid.flags = 0;
762 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
765 spin_unlock(&sp->so_lock);
769 static int reclaimer(void *ptr)
771 struct nfs_client *clp = ptr;
772 struct nfs4_state_owner *sp;
773 struct nfs4_state_recovery_ops *ops;
774 struct rpc_cred *cred;
777 allow_signal(SIGKILL);
779 /* Ensure exclusive access to NFSv4 state */
781 down_write(&clp->cl_sem);
782 /* Are there any NFS mounts out there? */
783 if (list_empty(&clp->cl_superblocks))
786 ops = &nfs4_network_partition_recovery_ops;
787 /* Are there any open files on this volume? */
788 cred = nfs4_get_renew_cred(clp);
790 /* Yes there are: try to renew the old lease */
791 status = nfs4_proc_renew(clp, cred);
794 case -NFS4ERR_CB_PATH_DOWN:
797 case -NFS4ERR_STALE_CLIENTID:
798 case -NFS4ERR_LEASE_MOVED:
799 ops = &nfs4_reboot_recovery_ops;
802 /* "reboot" to ensure we clear all state on the server */
803 clp->cl_boot_time = CURRENT_TIME;
804 cred = nfs4_get_setclientid_cred(clp);
806 /* We're going to have to re-establish a clientid */
807 nfs4_state_mark_reclaim(clp);
810 status = nfs4_init_client(clp, cred);
815 /* Mark all delegations for reclaim */
816 nfs_delegation_mark_reclaim(clp);
817 /* Note: list is protected by exclusive lock on cl->cl_sem */
818 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
819 status = nfs4_reclaim_open_state(ops, sp);
821 if (status == -NFS4ERR_NO_GRACE) {
822 ops = &nfs4_network_partition_recovery_ops;
823 status = nfs4_reclaim_open_state(ops, sp);
825 if (status == -NFS4ERR_STALE_CLIENTID)
827 if (status == -NFS4ERR_EXPIRED)
831 nfs_delegation_reap_unclaimed(clp);
833 up_write(&clp->cl_sem);
835 if (status == -NFS4ERR_CB_PATH_DOWN)
836 nfs_handle_cb_pathdown(clp);
837 nfs4_clear_recover_bit(clp);
839 module_put_and_exit(0);
842 printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n",
843 NIPQUAD(clp->cl_addr.sin_addr), -status);
844 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);