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/workqueue.h>
47 #include <linux/bitops.h>
51 #include "delegation.h"
53 #define OPENOWNER_POOL_SIZE 8
55 const nfs4_stateid zero_stateid;
57 static DEFINE_SPINLOCK(state_spinlock);
58 static LIST_HEAD(nfs4_clientid_list);
60 static void nfs4_recover_state(void *);
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 if (server->mnt_path) {
73 kfree(server->mnt_path);
74 server->mnt_path = NULL;
76 if (server->nfs4_state) {
77 nfs4_put_client(server->nfs4_state);
78 server->nfs4_state = NULL;
83 * nfs4_get_client(): returns an empty client structure
84 * nfs4_put_client(): drops reference to client structure
86 * Since these are allocated/deallocated very rarely, we don't
87 * bother putting them in a slab cache...
89 static struct nfs4_client *
90 nfs4_alloc_client(struct in_addr *addr)
92 struct nfs4_client *clp;
94 if (nfs_callback_up() < 0)
96 if ((clp = kmalloc(sizeof(*clp), GFP_KERNEL)) == NULL) {
100 memset(clp, 0, sizeof(*clp));
101 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
102 init_rwsem(&clp->cl_sem);
103 INIT_LIST_HEAD(&clp->cl_delegations);
104 INIT_LIST_HEAD(&clp->cl_state_owners);
105 INIT_LIST_HEAD(&clp->cl_unused);
106 spin_lock_init(&clp->cl_lock);
107 atomic_set(&clp->cl_count, 1);
108 INIT_WORK(&clp->cl_recoverd, nfs4_recover_state, clp);
109 INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp);
110 INIT_LIST_HEAD(&clp->cl_superblocks);
111 init_waitqueue_head(&clp->cl_waitq);
112 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS4 client");
113 clp->cl_rpcclient = ERR_PTR(-EINVAL);
114 clp->cl_boot_time = CURRENT_TIME;
115 clp->cl_state = 1 << NFS4CLNT_OK;
120 nfs4_free_client(struct nfs4_client *clp)
122 struct nfs4_state_owner *sp;
124 while (!list_empty(&clp->cl_unused)) {
125 sp = list_entry(clp->cl_unused.next,
126 struct nfs4_state_owner,
128 list_del(&sp->so_list);
131 BUG_ON(!list_empty(&clp->cl_state_owners));
133 put_rpccred(clp->cl_cred);
134 nfs_idmap_delete(clp);
135 if (!IS_ERR(clp->cl_rpcclient))
136 rpc_shutdown_client(clp->cl_rpcclient);
141 static struct nfs4_client *__nfs4_find_client(struct in_addr *addr)
143 struct nfs4_client *clp;
144 list_for_each_entry(clp, &nfs4_clientid_list, cl_servers) {
145 if (memcmp(&clp->cl_addr, addr, sizeof(clp->cl_addr)) == 0) {
146 atomic_inc(&clp->cl_count);
153 struct nfs4_client *nfs4_find_client(struct in_addr *addr)
155 struct nfs4_client *clp;
156 spin_lock(&state_spinlock);
157 clp = __nfs4_find_client(addr);
158 spin_unlock(&state_spinlock);
163 nfs4_get_client(struct in_addr *addr)
165 struct nfs4_client *clp, *new = NULL;
167 spin_lock(&state_spinlock);
169 clp = __nfs4_find_client(addr);
174 list_add(&clp->cl_servers, &nfs4_clientid_list);
178 spin_unlock(&state_spinlock);
179 new = nfs4_alloc_client(addr);
180 spin_lock(&state_spinlock);
184 spin_unlock(&state_spinlock);
186 nfs4_free_client(new);
191 nfs4_put_client(struct nfs4_client *clp)
193 if (!atomic_dec_and_lock(&clp->cl_count, &state_spinlock))
195 list_del(&clp->cl_servers);
196 spin_unlock(&state_spinlock);
197 BUG_ON(!list_empty(&clp->cl_superblocks));
198 wake_up_all(&clp->cl_waitq);
199 rpc_wake_up(&clp->cl_rpcwaitq);
200 nfs4_kill_renewd(clp);
201 nfs4_free_client(clp);
204 static int __nfs4_init_client(struct nfs4_client *clp)
206 int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, nfs_callback_tcpport);
208 status = nfs4_proc_setclientid_confirm(clp);
210 nfs4_schedule_state_renewal(clp);
214 int nfs4_init_client(struct nfs4_client *clp)
216 return nfs4_map_errors(__nfs4_init_client(clp));
220 nfs4_alloc_lockowner_id(struct nfs4_client *clp)
222 return clp->cl_lockowner_id ++;
225 static struct nfs4_state_owner *
226 nfs4_client_grab_unused(struct nfs4_client *clp, struct rpc_cred *cred)
228 struct nfs4_state_owner *sp = NULL;
230 if (!list_empty(&clp->cl_unused)) {
231 sp = list_entry(clp->cl_unused.next, struct nfs4_state_owner, so_list);
232 atomic_inc(&sp->so_count);
234 list_move(&sp->so_list, &clp->cl_state_owners);
240 static struct nfs4_state_owner *
241 nfs4_find_state_owner(struct nfs4_client *clp, struct rpc_cred *cred)
243 struct nfs4_state_owner *sp, *res = NULL;
245 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
246 if (sp->so_cred != cred)
248 atomic_inc(&sp->so_count);
249 /* Move to the head of the list */
250 list_move(&sp->so_list, &clp->cl_state_owners);
258 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
259 * create a new state_owner.
262 static struct nfs4_state_owner *
263 nfs4_alloc_state_owner(void)
265 struct nfs4_state_owner *sp;
267 sp = kzalloc(sizeof(*sp),GFP_KERNEL);
270 INIT_LIST_HEAD(&sp->so_states);
271 INIT_LIST_HEAD(&sp->so_delegations);
272 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
273 sp->so_seqid.sequence = &sp->so_sequence;
274 spin_lock_init(&sp->so_sequence.lock);
275 INIT_LIST_HEAD(&sp->so_sequence.list);
276 atomic_set(&sp->so_count, 1);
281 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
283 struct nfs4_client *clp = sp->so_client;
284 spin_lock(&clp->cl_lock);
285 list_del_init(&sp->so_list);
286 spin_unlock(&clp->cl_lock);
290 * Note: must be called with clp->cl_sem held in order to prevent races
291 * with reboot recovery!
293 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
295 struct nfs4_client *clp = server->nfs4_state;
296 struct nfs4_state_owner *sp, *new;
299 new = nfs4_alloc_state_owner();
300 spin_lock(&clp->cl_lock);
301 sp = nfs4_find_state_owner(clp, cred);
303 sp = nfs4_client_grab_unused(clp, cred);
304 if (sp == NULL && new != NULL) {
305 list_add(&new->so_list, &clp->cl_state_owners);
306 new->so_client = clp;
307 new->so_id = nfs4_alloc_lockowner_id(clp);
312 spin_unlock(&clp->cl_lock);
322 * Must be called with clp->cl_sem held in order to avoid races
323 * with state recovery...
325 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
327 struct nfs4_client *clp = sp->so_client;
328 struct rpc_cred *cred = sp->so_cred;
330 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
332 if (clp->cl_nunused >= OPENOWNER_POOL_SIZE)
334 if (list_empty(&sp->so_list))
336 list_move(&sp->so_list, &clp->cl_unused);
338 spin_unlock(&clp->cl_lock);
343 list_del(&sp->so_list);
344 spin_unlock(&clp->cl_lock);
349 static struct nfs4_state *
350 nfs4_alloc_open_state(void)
352 struct nfs4_state *state;
354 state = kmalloc(sizeof(*state), GFP_KERNEL);
361 memset(state->stateid.data, 0, sizeof(state->stateid.data));
362 atomic_set(&state->count, 1);
363 INIT_LIST_HEAD(&state->lock_states);
364 spin_lock_init(&state->state_lock);
368 static struct nfs4_state *
369 __nfs4_find_state(struct inode *inode, struct rpc_cred *cred, mode_t mode)
371 struct nfs_inode *nfsi = NFS_I(inode);
372 struct nfs4_state *state;
374 mode &= (FMODE_READ|FMODE_WRITE);
375 list_for_each_entry(state, &nfsi->open_states, inode_states) {
376 if (state->owner->so_cred != cred)
378 if ((mode & FMODE_READ) != 0 && state->nreaders == 0)
380 if ((mode & FMODE_WRITE) != 0 && state->nwriters == 0)
382 if ((state->state & mode) != mode)
384 atomic_inc(&state->count);
385 if (mode & FMODE_READ)
387 if (mode & FMODE_WRITE)
394 static struct nfs4_state *
395 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
397 struct nfs_inode *nfsi = NFS_I(inode);
398 struct nfs4_state *state;
400 list_for_each_entry(state, &nfsi->open_states, inode_states) {
401 /* Is this in the process of being freed? */
402 if (state->nreaders == 0 && state->nwriters == 0)
404 if (state->owner == owner) {
405 atomic_inc(&state->count);
413 nfs4_find_state(struct inode *inode, struct rpc_cred *cred, mode_t mode)
415 struct nfs4_state *state;
417 spin_lock(&inode->i_lock);
418 state = __nfs4_find_state(inode, cred, mode);
419 spin_unlock(&inode->i_lock);
424 nfs4_free_open_state(struct nfs4_state *state)
430 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
432 struct nfs4_state *state, *new;
433 struct nfs_inode *nfsi = NFS_I(inode);
435 spin_lock(&inode->i_lock);
436 state = __nfs4_find_state_byowner(inode, owner);
437 spin_unlock(&inode->i_lock);
440 new = nfs4_alloc_open_state();
441 spin_lock(&inode->i_lock);
442 state = __nfs4_find_state_byowner(inode, owner);
443 if (state == NULL && new != NULL) {
445 /* Note: The reclaim code dictates that we add stateless
446 * and read-only stateids to the end of the list */
447 list_add_tail(&state->open_states, &owner->so_states);
448 state->owner = owner;
449 atomic_inc(&owner->so_count);
450 list_add(&state->inode_states, &nfsi->open_states);
451 state->inode = igrab(inode);
452 spin_unlock(&inode->i_lock);
454 spin_unlock(&inode->i_lock);
456 nfs4_free_open_state(new);
463 * Beware! Caller must be holding exactly one
464 * reference to clp->cl_sem!
466 void nfs4_put_open_state(struct nfs4_state *state)
468 struct inode *inode = state->inode;
469 struct nfs4_state_owner *owner = state->owner;
471 if (!atomic_dec_and_lock(&state->count, &inode->i_lock))
473 if (!list_empty(&state->inode_states))
474 list_del(&state->inode_states);
475 spin_unlock(&inode->i_lock);
476 list_del(&state->open_states);
478 BUG_ON (state->state != 0);
479 nfs4_free_open_state(state);
480 nfs4_put_state_owner(owner);
484 * Beware! Caller must be holding no references to clp->cl_sem!
486 void nfs4_close_state(struct nfs4_state *state, mode_t mode)
488 struct inode *inode = state->inode;
489 struct nfs4_state_owner *owner = state->owner;
490 struct nfs4_client *clp = owner->so_client;
493 atomic_inc(&owner->so_count);
494 down_read(&clp->cl_sem);
495 /* Protect against nfs4_find_state() */
496 spin_lock(&inode->i_lock);
497 if (mode & FMODE_READ)
499 if (mode & FMODE_WRITE)
501 if (state->nwriters == 0) {
502 if (state->nreaders == 0)
503 list_del_init(&state->inode_states);
504 /* See reclaim code */
505 list_move_tail(&state->open_states, &owner->so_states);
507 spin_unlock(&inode->i_lock);
509 if (state->state != 0) {
511 newstate |= FMODE_READ;
513 newstate |= FMODE_WRITE;
514 if (state->state == newstate)
516 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
517 state->state = newstate;
520 if (nfs4_do_close(inode, state, newstate) == 0)
524 nfs4_put_open_state(state);
525 nfs4_put_state_owner(owner);
526 up_read(&clp->cl_sem);
530 * Search the state->lock_states for an existing lock_owner
531 * that is compatible with current->files
533 static struct nfs4_lock_state *
534 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
536 struct nfs4_lock_state *pos;
537 list_for_each_entry(pos, &state->lock_states, ls_locks) {
538 if (pos->ls_owner != fl_owner)
540 atomic_inc(&pos->ls_count);
547 * Return a compatible lock_state. If no initialized lock_state structure
548 * exists, return an uninitialized one.
551 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
553 struct nfs4_lock_state *lsp;
554 struct nfs4_client *clp = state->owner->so_client;
556 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
559 lsp->ls_seqid.sequence = &state->owner->so_sequence;
560 atomic_set(&lsp->ls_count, 1);
561 lsp->ls_owner = fl_owner;
562 spin_lock(&clp->cl_lock);
563 lsp->ls_id = nfs4_alloc_lockowner_id(clp);
564 spin_unlock(&clp->cl_lock);
565 INIT_LIST_HEAD(&lsp->ls_locks);
570 * Return a compatible lock_state. If no initialized lock_state structure
571 * exists, return an uninitialized one.
573 * The caller must be holding clp->cl_sem
575 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
577 struct nfs4_lock_state *lsp, *new = NULL;
580 spin_lock(&state->state_lock);
581 lsp = __nfs4_find_lock_state(state, owner);
585 new->ls_state = state;
586 list_add(&new->ls_locks, &state->lock_states);
587 set_bit(LK_STATE_IN_USE, &state->flags);
592 spin_unlock(&state->state_lock);
593 new = nfs4_alloc_lock_state(state, owner);
597 spin_unlock(&state->state_lock);
603 * Release reference to lock_state, and free it if we see that
604 * it is no longer in use
606 static void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
608 struct nfs4_state *state;
612 state = lsp->ls_state;
613 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
615 list_del(&lsp->ls_locks);
616 if (list_empty(&state->lock_states))
617 clear_bit(LK_STATE_IN_USE, &state->flags);
618 spin_unlock(&state->state_lock);
622 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
624 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
626 dst->fl_u.nfs4_fl.owner = lsp;
627 atomic_inc(&lsp->ls_count);
630 static void nfs4_fl_release_lock(struct file_lock *fl)
632 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
635 static struct file_lock_operations nfs4_fl_lock_ops = {
636 .fl_copy_lock = nfs4_fl_copy_lock,
637 .fl_release_private = nfs4_fl_release_lock,
640 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
642 struct nfs4_lock_state *lsp;
644 if (fl->fl_ops != NULL)
646 lsp = nfs4_get_lock_state(state, fl->fl_owner);
649 fl->fl_u.nfs4_fl.owner = lsp;
650 fl->fl_ops = &nfs4_fl_lock_ops;
655 * Byte-range lock aware utility to initialize the stateid of read/write
658 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
660 struct nfs4_lock_state *lsp;
662 memcpy(dst, &state->stateid, sizeof(*dst));
663 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
666 spin_lock(&state->state_lock);
667 lsp = __nfs4_find_lock_state(state, fl_owner);
668 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
669 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
670 spin_unlock(&state->state_lock);
671 nfs4_put_lock_state(lsp);
674 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
676 struct rpc_sequence *sequence = counter->sequence;
677 struct nfs_seqid *new;
679 new = kmalloc(sizeof(*new), GFP_KERNEL);
681 new->sequence = counter;
683 spin_lock(&sequence->lock);
684 list_add_tail(&new->list, &sequence->list);
685 spin_unlock(&sequence->lock);
690 void nfs_free_seqid(struct nfs_seqid *seqid)
692 struct rpc_sequence *sequence = seqid->sequence->sequence;
693 struct rpc_task *next = NULL;
695 spin_lock(&sequence->lock);
696 list_del(&seqid->list);
697 if (!list_empty(&sequence->list)) {
698 next = list_entry(sequence->list.next, struct nfs_seqid, list)->task;
700 rpc_wake_up_task(next);
702 spin_unlock(&sequence->lock);
707 * Called with clp->cl_sem held.
709 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
710 * failed with a seqid incrementing error -
711 * see comments nfs_fs.h:seqid_mutating_error()
713 static inline void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
718 case -NFS4ERR_BAD_SEQID:
719 case -NFS4ERR_STALE_CLIENTID:
720 case -NFS4ERR_STALE_STATEID:
721 case -NFS4ERR_BAD_STATEID:
722 case -NFS4ERR_BADXDR:
723 case -NFS4ERR_RESOURCE:
724 case -NFS4ERR_NOFILEHANDLE:
725 /* Non-seqid mutating errors */
729 * Note: no locking needed as we are guaranteed to be first
730 * on the sequence list
732 seqid->sequence->counter++;
735 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
737 if (status == -NFS4ERR_BAD_SEQID) {
738 struct nfs4_state_owner *sp = container_of(seqid->sequence,
739 struct nfs4_state_owner, so_seqid);
740 nfs4_drop_state_owner(sp);
742 return nfs_increment_seqid(status, seqid);
746 * Called with clp->cl_sem held.
748 * Increment the seqid if the LOCK/LOCKU succeeded, or
749 * failed with a seqid incrementing error -
750 * see comments nfs_fs.h:seqid_mutating_error()
752 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
754 return nfs_increment_seqid(status, seqid);
757 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
759 struct rpc_sequence *sequence = seqid->sequence->sequence;
762 spin_lock(&sequence->lock);
763 if (sequence->list.next != &seqid->list) {
765 rpc_sleep_on(&sequence->wait, task, NULL, NULL);
768 spin_unlock(&sequence->lock);
772 static int reclaimer(void *);
773 struct reclaimer_args {
774 struct nfs4_client *clp;
775 struct completion complete;
779 * State recovery routine
782 nfs4_recover_state(void *data)
784 struct nfs4_client *clp = (struct nfs4_client *)data;
785 struct reclaimer_args args = {
790 init_completion(&args.complete);
792 if (kernel_thread(reclaimer, &args, CLONE_KERNEL) < 0)
793 goto out_failed_clear;
794 wait_for_completion(&args.complete);
797 set_bit(NFS4CLNT_OK, &clp->cl_state);
798 wake_up_all(&clp->cl_waitq);
799 rpc_wake_up(&clp->cl_rpcwaitq);
803 * Schedule a state recovery attempt
806 nfs4_schedule_state_recovery(struct nfs4_client *clp)
810 if (test_and_clear_bit(NFS4CLNT_OK, &clp->cl_state))
811 schedule_work(&clp->cl_recoverd);
814 static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state)
816 struct inode *inode = state->inode;
817 struct file_lock *fl;
820 for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
821 if (!(fl->fl_flags & FL_POSIX))
823 if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state)
825 status = ops->recover_lock(state, fl);
830 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
831 __FUNCTION__, status);
832 case -NFS4ERR_EXPIRED:
833 case -NFS4ERR_NO_GRACE:
834 case -NFS4ERR_RECLAIM_BAD:
835 case -NFS4ERR_RECLAIM_CONFLICT:
836 /* kill_proc(fl->fl_owner, SIGLOST, 1); */
838 case -NFS4ERR_STALE_CLIENTID:
847 static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp)
849 struct nfs4_state *state;
850 struct nfs4_lock_state *lock;
853 /* Note: we rely on the sp->so_states list being ordered
854 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
856 * This is needed to ensure that the server won't give us any
857 * read delegations that we have to return if, say, we are
858 * recovering after a network partition or a reboot from a
859 * server that doesn't support a grace period.
861 list_for_each_entry(state, &sp->so_states, open_states) {
862 if (state->state == 0)
864 status = ops->recover_open(sp, state);
866 status = nfs4_reclaim_locks(ops, state);
869 list_for_each_entry(lock, &state->lock_states, ls_locks) {
870 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
871 printk("%s: Lock reclaim failed!\n",
878 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
879 __FUNCTION__, status);
881 case -NFS4ERR_RECLAIM_BAD:
882 case -NFS4ERR_RECLAIM_CONFLICT:
884 * Open state on this file cannot be recovered
885 * All we can do is revert to using the zero stateid.
887 memset(state->stateid.data, 0,
888 sizeof(state->stateid.data));
889 /* Mark the file as being 'closed' */
892 case -NFS4ERR_EXPIRED:
893 case -NFS4ERR_NO_GRACE:
894 case -NFS4ERR_STALE_CLIENTID:
903 static void nfs4_state_mark_reclaim(struct nfs4_client *clp)
905 struct nfs4_state_owner *sp;
906 struct nfs4_state *state;
907 struct nfs4_lock_state *lock;
909 /* Reset all sequence ids to zero */
910 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
911 sp->so_seqid.counter = 0;
912 sp->so_seqid.flags = 0;
913 list_for_each_entry(state, &sp->so_states, open_states) {
914 list_for_each_entry(lock, &state->lock_states, ls_locks) {
915 lock->ls_seqid.counter = 0;
916 lock->ls_seqid.flags = 0;
917 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
923 static int reclaimer(void *ptr)
925 struct reclaimer_args *args = (struct reclaimer_args *)ptr;
926 struct nfs4_client *clp = args->clp;
927 struct nfs4_state_owner *sp;
928 struct nfs4_state_recovery_ops *ops;
931 daemonize("%u.%u.%u.%u-reclaim", NIPQUAD(clp->cl_addr));
932 allow_signal(SIGKILL);
934 atomic_inc(&clp->cl_count);
935 complete(&args->complete);
937 /* Ensure exclusive access to NFSv4 state */
939 down_write(&clp->cl_sem);
940 /* Are there any NFS mounts out there? */
941 if (list_empty(&clp->cl_superblocks))
944 status = nfs4_proc_renew(clp);
947 case -NFS4ERR_CB_PATH_DOWN:
949 case -NFS4ERR_STALE_CLIENTID:
950 case -NFS4ERR_LEASE_MOVED:
951 ops = &nfs4_reboot_recovery_ops;
954 ops = &nfs4_network_partition_recovery_ops;
956 nfs4_state_mark_reclaim(clp);
957 status = __nfs4_init_client(clp);
960 /* Mark all delegations for reclaim */
961 nfs_delegation_mark_reclaim(clp);
962 /* Note: list is protected by exclusive lock on cl->cl_sem */
963 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
964 status = nfs4_reclaim_open_state(ops, sp);
966 if (status == -NFS4ERR_NO_GRACE) {
967 ops = &nfs4_network_partition_recovery_ops;
968 status = nfs4_reclaim_open_state(ops, sp);
970 if (status == -NFS4ERR_STALE_CLIENTID)
972 if (status == -NFS4ERR_EXPIRED)
976 nfs_delegation_reap_unclaimed(clp);
978 set_bit(NFS4CLNT_OK, &clp->cl_state);
979 up_write(&clp->cl_sem);
981 wake_up_all(&clp->cl_waitq);
982 rpc_wake_up(&clp->cl_rpcwaitq);
983 if (status == -NFS4ERR_CB_PATH_DOWN)
984 nfs_handle_cb_pathdown(clp);
985 nfs4_put_client(clp);
988 printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n",
989 NIPQUAD(clp->cl_addr.s_addr), -status);