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/config.h>
42 #include <linux/slab.h>
43 #include <linux/smp_lock.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/workqueue.h>
49 #include <linux/bitops.h>
53 #include "delegation.h"
55 #define OPENOWNER_POOL_SIZE 8
57 const nfs4_stateid zero_stateid;
59 static DEFINE_SPINLOCK(state_spinlock);
60 static LIST_HEAD(nfs4_clientid_list);
63 init_nfsv4_state(struct nfs_server *server)
65 server->nfs4_state = NULL;
66 INIT_LIST_HEAD(&server->nfs4_siblings);
70 destroy_nfsv4_state(struct nfs_server *server)
72 kfree(server->mnt_path);
73 server->mnt_path = NULL;
74 if (server->nfs4_state) {
75 nfs4_put_client(server->nfs4_state);
76 server->nfs4_state = NULL;
81 * nfs4_get_client(): returns an empty client structure
82 * nfs4_put_client(): drops reference to client structure
84 * Since these are allocated/deallocated very rarely, we don't
85 * bother putting them in a slab cache...
87 static struct nfs4_client *
88 nfs4_alloc_client(struct in_addr *addr)
90 struct nfs4_client *clp;
92 if (nfs_callback_up() < 0)
94 if ((clp = kmalloc(sizeof(*clp), GFP_KERNEL)) == NULL) {
98 memset(clp, 0, sizeof(*clp));
99 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
100 init_rwsem(&clp->cl_sem);
101 INIT_LIST_HEAD(&clp->cl_delegations);
102 INIT_LIST_HEAD(&clp->cl_state_owners);
103 INIT_LIST_HEAD(&clp->cl_unused);
104 spin_lock_init(&clp->cl_lock);
105 atomic_set(&clp->cl_count, 1);
106 INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp);
107 INIT_LIST_HEAD(&clp->cl_superblocks);
108 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS4 client");
109 clp->cl_rpcclient = ERR_PTR(-EINVAL);
110 clp->cl_boot_time = CURRENT_TIME;
116 nfs4_free_client(struct nfs4_client *clp)
118 struct nfs4_state_owner *sp;
120 while (!list_empty(&clp->cl_unused)) {
121 sp = list_entry(clp->cl_unused.next,
122 struct nfs4_state_owner,
124 list_del(&sp->so_list);
127 BUG_ON(!list_empty(&clp->cl_state_owners));
129 put_rpccred(clp->cl_cred);
130 nfs_idmap_delete(clp);
131 if (!IS_ERR(clp->cl_rpcclient))
132 rpc_shutdown_client(clp->cl_rpcclient);
137 static struct nfs4_client *__nfs4_find_client(struct in_addr *addr)
139 struct nfs4_client *clp;
140 list_for_each_entry(clp, &nfs4_clientid_list, cl_servers) {
141 if (memcmp(&clp->cl_addr, addr, sizeof(clp->cl_addr)) == 0) {
142 atomic_inc(&clp->cl_count);
149 struct nfs4_client *nfs4_find_client(struct in_addr *addr)
151 struct nfs4_client *clp;
152 spin_lock(&state_spinlock);
153 clp = __nfs4_find_client(addr);
154 spin_unlock(&state_spinlock);
159 nfs4_get_client(struct in_addr *addr)
161 struct nfs4_client *clp, *new = NULL;
163 spin_lock(&state_spinlock);
165 clp = __nfs4_find_client(addr);
170 list_add(&clp->cl_servers, &nfs4_clientid_list);
174 spin_unlock(&state_spinlock);
175 new = nfs4_alloc_client(addr);
176 spin_lock(&state_spinlock);
180 spin_unlock(&state_spinlock);
182 nfs4_free_client(new);
187 nfs4_put_client(struct nfs4_client *clp)
189 if (!atomic_dec_and_lock(&clp->cl_count, &state_spinlock))
191 list_del(&clp->cl_servers);
192 spin_unlock(&state_spinlock);
193 BUG_ON(!list_empty(&clp->cl_superblocks));
194 rpc_wake_up(&clp->cl_rpcwaitq);
195 nfs4_kill_renewd(clp);
196 nfs4_free_client(clp);
199 static int __nfs4_init_client(struct nfs4_client *clp)
201 int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, nfs_callback_tcpport);
203 status = nfs4_proc_setclientid_confirm(clp);
205 nfs4_schedule_state_renewal(clp);
209 int nfs4_init_client(struct nfs4_client *clp)
211 return nfs4_map_errors(__nfs4_init_client(clp));
215 nfs4_alloc_lockowner_id(struct nfs4_client *clp)
217 return clp->cl_lockowner_id ++;
220 static struct nfs4_state_owner *
221 nfs4_client_grab_unused(struct nfs4_client *clp, struct rpc_cred *cred)
223 struct nfs4_state_owner *sp = NULL;
225 if (!list_empty(&clp->cl_unused)) {
226 sp = list_entry(clp->cl_unused.next, struct nfs4_state_owner, so_list);
227 atomic_inc(&sp->so_count);
229 list_move(&sp->so_list, &clp->cl_state_owners);
235 static struct nfs4_state_owner *
236 nfs4_find_state_owner(struct nfs4_client *clp, struct rpc_cred *cred)
238 struct nfs4_state_owner *sp, *res = NULL;
240 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
241 if (sp->so_cred != cred)
243 atomic_inc(&sp->so_count);
244 /* Move to the head of the list */
245 list_move(&sp->so_list, &clp->cl_state_owners);
253 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
254 * create a new state_owner.
257 static struct nfs4_state_owner *
258 nfs4_alloc_state_owner(void)
260 struct nfs4_state_owner *sp;
262 sp = kzalloc(sizeof(*sp),GFP_KERNEL);
265 spin_lock_init(&sp->so_lock);
266 INIT_LIST_HEAD(&sp->so_states);
267 INIT_LIST_HEAD(&sp->so_delegations);
268 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
269 sp->so_seqid.sequence = &sp->so_sequence;
270 spin_lock_init(&sp->so_sequence.lock);
271 INIT_LIST_HEAD(&sp->so_sequence.list);
272 atomic_set(&sp->so_count, 1);
277 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
279 struct nfs4_client *clp = sp->so_client;
280 spin_lock(&clp->cl_lock);
281 list_del_init(&sp->so_list);
282 spin_unlock(&clp->cl_lock);
286 * Note: must be called with clp->cl_sem held in order to prevent races
287 * with reboot recovery!
289 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
291 struct nfs4_client *clp = server->nfs4_state;
292 struct nfs4_state_owner *sp, *new;
295 new = nfs4_alloc_state_owner();
296 spin_lock(&clp->cl_lock);
297 sp = nfs4_find_state_owner(clp, cred);
299 sp = nfs4_client_grab_unused(clp, cred);
300 if (sp == NULL && new != NULL) {
301 list_add(&new->so_list, &clp->cl_state_owners);
302 new->so_client = clp;
303 new->so_id = nfs4_alloc_lockowner_id(clp);
308 spin_unlock(&clp->cl_lock);
317 * Must be called with clp->cl_sem held in order to avoid races
318 * with state recovery...
320 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
322 struct nfs4_client *clp = sp->so_client;
323 struct rpc_cred *cred = sp->so_cred;
325 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
327 if (clp->cl_nunused >= OPENOWNER_POOL_SIZE)
329 if (list_empty(&sp->so_list))
331 list_move(&sp->so_list, &clp->cl_unused);
333 spin_unlock(&clp->cl_lock);
338 list_del(&sp->so_list);
339 spin_unlock(&clp->cl_lock);
344 static struct nfs4_state *
345 nfs4_alloc_open_state(void)
347 struct nfs4_state *state;
349 state = kzalloc(sizeof(*state), GFP_KERNEL);
352 atomic_set(&state->count, 1);
353 INIT_LIST_HEAD(&state->lock_states);
354 spin_lock_init(&state->state_lock);
359 nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode)
361 if (state->state == mode)
363 /* NB! List reordering - see the reclaim code for why. */
364 if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
365 if (mode & FMODE_WRITE)
366 list_move(&state->open_states, &state->owner->so_states);
368 list_move_tail(&state->open_states, &state->owner->so_states);
371 list_del_init(&state->inode_states);
375 static struct nfs4_state *
376 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
378 struct nfs_inode *nfsi = NFS_I(inode);
379 struct nfs4_state *state;
381 list_for_each_entry(state, &nfsi->open_states, inode_states) {
382 /* Is this in the process of being freed? */
383 if (state->state == 0)
385 if (state->owner == owner) {
386 atomic_inc(&state->count);
394 nfs4_free_open_state(struct nfs4_state *state)
400 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
402 struct nfs4_state *state, *new;
403 struct nfs_inode *nfsi = NFS_I(inode);
405 spin_lock(&inode->i_lock);
406 state = __nfs4_find_state_byowner(inode, owner);
407 spin_unlock(&inode->i_lock);
410 new = nfs4_alloc_open_state();
411 spin_lock(&owner->so_lock);
412 spin_lock(&inode->i_lock);
413 state = __nfs4_find_state_byowner(inode, owner);
414 if (state == NULL && new != NULL) {
416 state->owner = owner;
417 atomic_inc(&owner->so_count);
418 list_add(&state->inode_states, &nfsi->open_states);
419 state->inode = igrab(inode);
420 spin_unlock(&inode->i_lock);
421 /* Note: The reclaim code dictates that we add stateless
422 * and read-only stateids to the end of the list */
423 list_add_tail(&state->open_states, &owner->so_states);
424 spin_unlock(&owner->so_lock);
426 spin_unlock(&inode->i_lock);
427 spin_unlock(&owner->so_lock);
429 nfs4_free_open_state(new);
436 * Beware! Caller must be holding exactly one
437 * reference to clp->cl_sem!
439 void nfs4_put_open_state(struct nfs4_state *state)
441 struct inode *inode = state->inode;
442 struct nfs4_state_owner *owner = state->owner;
444 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
446 spin_lock(&inode->i_lock);
447 if (!list_empty(&state->inode_states))
448 list_del(&state->inode_states);
449 list_del(&state->open_states);
450 spin_unlock(&inode->i_lock);
451 spin_unlock(&owner->so_lock);
453 nfs4_free_open_state(state);
454 nfs4_put_state_owner(owner);
458 * Close the current file.
460 void nfs4_close_state(struct nfs4_state *state, mode_t mode)
462 struct inode *inode = state->inode;
463 struct nfs4_state_owner *owner = state->owner;
464 int oldstate, newstate = 0;
466 atomic_inc(&owner->so_count);
467 /* Protect against nfs4_find_state() */
468 spin_lock(&owner->so_lock);
469 spin_lock(&inode->i_lock);
470 switch (mode & (FMODE_READ | FMODE_WRITE)) {
477 case FMODE_READ|FMODE_WRITE:
480 oldstate = newstate = state->state;
481 if (state->n_rdwr == 0) {
482 if (state->n_rdonly == 0)
483 newstate &= ~FMODE_READ;
484 if (state->n_wronly == 0)
485 newstate &= ~FMODE_WRITE;
487 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
488 nfs4_state_set_mode_locked(state, newstate);
491 spin_unlock(&inode->i_lock);
492 spin_unlock(&owner->so_lock);
494 if (oldstate != newstate && nfs4_do_close(inode, state) == 0)
496 nfs4_put_open_state(state);
497 nfs4_put_state_owner(owner);
501 * Search the state->lock_states for an existing lock_owner
502 * that is compatible with current->files
504 static struct nfs4_lock_state *
505 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
507 struct nfs4_lock_state *pos;
508 list_for_each_entry(pos, &state->lock_states, ls_locks) {
509 if (pos->ls_owner != fl_owner)
511 atomic_inc(&pos->ls_count);
518 * Return a compatible lock_state. If no initialized lock_state structure
519 * exists, return an uninitialized one.
522 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
524 struct nfs4_lock_state *lsp;
525 struct nfs4_client *clp = state->owner->so_client;
527 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
530 lsp->ls_seqid.sequence = &state->owner->so_sequence;
531 atomic_set(&lsp->ls_count, 1);
532 lsp->ls_owner = fl_owner;
533 spin_lock(&clp->cl_lock);
534 lsp->ls_id = nfs4_alloc_lockowner_id(clp);
535 spin_unlock(&clp->cl_lock);
536 INIT_LIST_HEAD(&lsp->ls_locks);
541 * Return a compatible lock_state. If no initialized lock_state structure
542 * exists, return an uninitialized one.
544 * The caller must be holding clp->cl_sem
546 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
548 struct nfs4_lock_state *lsp, *new = NULL;
551 spin_lock(&state->state_lock);
552 lsp = __nfs4_find_lock_state(state, owner);
556 new->ls_state = state;
557 list_add(&new->ls_locks, &state->lock_states);
558 set_bit(LK_STATE_IN_USE, &state->flags);
563 spin_unlock(&state->state_lock);
564 new = nfs4_alloc_lock_state(state, owner);
568 spin_unlock(&state->state_lock);
574 * Release reference to lock_state, and free it if we see that
575 * it is no longer in use
577 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
579 struct nfs4_state *state;
583 state = lsp->ls_state;
584 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
586 list_del(&lsp->ls_locks);
587 if (list_empty(&state->lock_states))
588 clear_bit(LK_STATE_IN_USE, &state->flags);
589 spin_unlock(&state->state_lock);
593 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
595 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
597 dst->fl_u.nfs4_fl.owner = lsp;
598 atomic_inc(&lsp->ls_count);
601 static void nfs4_fl_release_lock(struct file_lock *fl)
603 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
606 static struct file_lock_operations nfs4_fl_lock_ops = {
607 .fl_copy_lock = nfs4_fl_copy_lock,
608 .fl_release_private = nfs4_fl_release_lock,
611 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
613 struct nfs4_lock_state *lsp;
615 if (fl->fl_ops != NULL)
617 lsp = nfs4_get_lock_state(state, fl->fl_owner);
620 fl->fl_u.nfs4_fl.owner = lsp;
621 fl->fl_ops = &nfs4_fl_lock_ops;
626 * Byte-range lock aware utility to initialize the stateid of read/write
629 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
631 struct nfs4_lock_state *lsp;
633 memcpy(dst, &state->stateid, sizeof(*dst));
634 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
637 spin_lock(&state->state_lock);
638 lsp = __nfs4_find_lock_state(state, fl_owner);
639 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
640 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
641 spin_unlock(&state->state_lock);
642 nfs4_put_lock_state(lsp);
645 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
647 struct rpc_sequence *sequence = counter->sequence;
648 struct nfs_seqid *new;
650 new = kmalloc(sizeof(*new), GFP_KERNEL);
652 new->sequence = counter;
653 spin_lock(&sequence->lock);
654 list_add_tail(&new->list, &sequence->list);
655 spin_unlock(&sequence->lock);
660 void nfs_free_seqid(struct nfs_seqid *seqid)
662 struct rpc_sequence *sequence = seqid->sequence->sequence;
664 spin_lock(&sequence->lock);
665 list_del(&seqid->list);
666 spin_unlock(&sequence->lock);
667 rpc_wake_up(&sequence->wait);
672 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
673 * failed with a seqid incrementing error -
674 * see comments nfs_fs.h:seqid_mutating_error()
676 static inline void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
681 case -NFS4ERR_BAD_SEQID:
682 case -NFS4ERR_STALE_CLIENTID:
683 case -NFS4ERR_STALE_STATEID:
684 case -NFS4ERR_BAD_STATEID:
685 case -NFS4ERR_BADXDR:
686 case -NFS4ERR_RESOURCE:
687 case -NFS4ERR_NOFILEHANDLE:
688 /* Non-seqid mutating errors */
692 * Note: no locking needed as we are guaranteed to be first
693 * on the sequence list
695 seqid->sequence->counter++;
698 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
700 if (status == -NFS4ERR_BAD_SEQID) {
701 struct nfs4_state_owner *sp = container_of(seqid->sequence,
702 struct nfs4_state_owner, so_seqid);
703 nfs4_drop_state_owner(sp);
705 return nfs_increment_seqid(status, seqid);
709 * Increment the seqid if the LOCK/LOCKU succeeded, or
710 * failed with a seqid incrementing error -
711 * see comments nfs_fs.h:seqid_mutating_error()
713 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
715 return nfs_increment_seqid(status, seqid);
718 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
720 struct rpc_sequence *sequence = seqid->sequence->sequence;
723 if (sequence->list.next == &seqid->list)
725 spin_lock(&sequence->lock);
726 if (sequence->list.next != &seqid->list) {
727 rpc_sleep_on(&sequence->wait, task, NULL, NULL);
730 spin_unlock(&sequence->lock);
735 static int reclaimer(void *);
737 static inline void nfs4_clear_recover_bit(struct nfs4_client *clp)
739 smp_mb__before_clear_bit();
740 clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state);
741 smp_mb__after_clear_bit();
742 wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER);
743 rpc_wake_up(&clp->cl_rpcwaitq);
747 * State recovery routine
749 static void nfs4_recover_state(struct nfs4_client *clp)
751 struct task_struct *task;
753 __module_get(THIS_MODULE);
754 atomic_inc(&clp->cl_count);
755 task = kthread_run(reclaimer, clp, "%u.%u.%u.%u-reclaim",
756 NIPQUAD(clp->cl_addr));
759 nfs4_clear_recover_bit(clp);
760 nfs4_put_client(clp);
761 module_put(THIS_MODULE);
765 * Schedule a state recovery attempt
767 void nfs4_schedule_state_recovery(struct nfs4_client *clp)
771 if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
772 nfs4_recover_state(clp);
775 static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state)
777 struct inode *inode = state->inode;
778 struct file_lock *fl;
781 for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
782 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
784 if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state)
786 status = ops->recover_lock(state, fl);
791 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
792 __FUNCTION__, status);
793 case -NFS4ERR_EXPIRED:
794 case -NFS4ERR_NO_GRACE:
795 case -NFS4ERR_RECLAIM_BAD:
796 case -NFS4ERR_RECLAIM_CONFLICT:
797 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
799 case -NFS4ERR_STALE_CLIENTID:
808 static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp)
810 struct nfs4_state *state;
811 struct nfs4_lock_state *lock;
814 /* Note: we rely on the sp->so_states list being ordered
815 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
817 * This is needed to ensure that the server won't give us any
818 * read delegations that we have to return if, say, we are
819 * recovering after a network partition or a reboot from a
820 * server that doesn't support a grace period.
822 list_for_each_entry(state, &sp->so_states, open_states) {
823 if (state->state == 0)
825 status = ops->recover_open(sp, state);
827 status = nfs4_reclaim_locks(ops, state);
830 list_for_each_entry(lock, &state->lock_states, ls_locks) {
831 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
832 printk("%s: Lock reclaim failed!\n",
839 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
840 __FUNCTION__, status);
842 case -NFS4ERR_RECLAIM_BAD:
843 case -NFS4ERR_RECLAIM_CONFLICT:
845 * Open state on this file cannot be recovered
846 * All we can do is revert to using the zero stateid.
848 memset(state->stateid.data, 0,
849 sizeof(state->stateid.data));
850 /* Mark the file as being 'closed' */
853 case -NFS4ERR_EXPIRED:
854 case -NFS4ERR_NO_GRACE:
855 case -NFS4ERR_STALE_CLIENTID:
864 static void nfs4_state_mark_reclaim(struct nfs4_client *clp)
866 struct nfs4_state_owner *sp;
867 struct nfs4_state *state;
868 struct nfs4_lock_state *lock;
870 /* Reset all sequence ids to zero */
871 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
872 sp->so_seqid.counter = 0;
873 sp->so_seqid.flags = 0;
874 spin_lock(&sp->so_lock);
875 list_for_each_entry(state, &sp->so_states, open_states) {
876 list_for_each_entry(lock, &state->lock_states, ls_locks) {
877 lock->ls_seqid.counter = 0;
878 lock->ls_seqid.flags = 0;
879 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
882 spin_unlock(&sp->so_lock);
886 static int reclaimer(void *ptr)
888 struct nfs4_client *clp = ptr;
889 struct nfs4_state_owner *sp;
890 struct nfs4_state_recovery_ops *ops;
893 allow_signal(SIGKILL);
895 /* Ensure exclusive access to NFSv4 state */
897 down_write(&clp->cl_sem);
898 /* Are there any NFS mounts out there? */
899 if (list_empty(&clp->cl_superblocks))
902 status = nfs4_proc_renew(clp);
905 case -NFS4ERR_CB_PATH_DOWN:
907 case -NFS4ERR_STALE_CLIENTID:
908 case -NFS4ERR_LEASE_MOVED:
909 ops = &nfs4_reboot_recovery_ops;
912 ops = &nfs4_network_partition_recovery_ops;
914 nfs4_state_mark_reclaim(clp);
915 status = __nfs4_init_client(clp);
918 /* Mark all delegations for reclaim */
919 nfs_delegation_mark_reclaim(clp);
920 /* Note: list is protected by exclusive lock on cl->cl_sem */
921 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
922 status = nfs4_reclaim_open_state(ops, sp);
924 if (status == -NFS4ERR_NO_GRACE) {
925 ops = &nfs4_network_partition_recovery_ops;
926 status = nfs4_reclaim_open_state(ops, sp);
928 if (status == -NFS4ERR_STALE_CLIENTID)
930 if (status == -NFS4ERR_EXPIRED)
934 nfs_delegation_reap_unclaimed(clp);
936 up_write(&clp->cl_sem);
938 if (status == -NFS4ERR_CB_PATH_DOWN)
939 nfs_handle_cb_pathdown(clp);
940 nfs4_clear_recover_bit(clp);
941 nfs4_put_client(clp);
942 module_put_and_exit(0);
945 printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n",
946 NIPQUAD(clp->cl_addr.s_addr), -status);