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_boot_time = CURRENT_TIME;
114 clp->cl_state = 1 << NFS4CLNT_OK;
119 nfs4_free_client(struct nfs4_client *clp)
121 struct nfs4_state_owner *sp;
123 while (!list_empty(&clp->cl_unused)) {
124 sp = list_entry(clp->cl_unused.next,
125 struct nfs4_state_owner,
127 list_del(&sp->so_list);
130 BUG_ON(!list_empty(&clp->cl_state_owners));
132 put_rpccred(clp->cl_cred);
133 nfs_idmap_delete(clp);
134 if (clp->cl_rpcclient)
135 rpc_shutdown_client(clp->cl_rpcclient);
140 static struct nfs4_client *__nfs4_find_client(struct in_addr *addr)
142 struct nfs4_client *clp;
143 list_for_each_entry(clp, &nfs4_clientid_list, cl_servers) {
144 if (memcmp(&clp->cl_addr, addr, sizeof(clp->cl_addr)) == 0) {
145 atomic_inc(&clp->cl_count);
152 struct nfs4_client *nfs4_find_client(struct in_addr *addr)
154 struct nfs4_client *clp;
155 spin_lock(&state_spinlock);
156 clp = __nfs4_find_client(addr);
157 spin_unlock(&state_spinlock);
162 nfs4_get_client(struct in_addr *addr)
164 struct nfs4_client *clp, *new = NULL;
166 spin_lock(&state_spinlock);
168 clp = __nfs4_find_client(addr);
173 list_add(&clp->cl_servers, &nfs4_clientid_list);
177 spin_unlock(&state_spinlock);
178 new = nfs4_alloc_client(addr);
179 spin_lock(&state_spinlock);
183 spin_unlock(&state_spinlock);
185 nfs4_free_client(new);
190 nfs4_put_client(struct nfs4_client *clp)
192 if (!atomic_dec_and_lock(&clp->cl_count, &state_spinlock))
194 list_del(&clp->cl_servers);
195 spin_unlock(&state_spinlock);
196 BUG_ON(!list_empty(&clp->cl_superblocks));
197 wake_up_all(&clp->cl_waitq);
198 rpc_wake_up(&clp->cl_rpcwaitq);
199 nfs4_kill_renewd(clp);
200 nfs4_free_client(clp);
203 static int __nfs4_init_client(struct nfs4_client *clp)
205 int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, nfs_callback_tcpport);
207 status = nfs4_proc_setclientid_confirm(clp);
209 nfs4_schedule_state_renewal(clp);
213 int nfs4_init_client(struct nfs4_client *clp)
215 return nfs4_map_errors(__nfs4_init_client(clp));
219 nfs4_alloc_lockowner_id(struct nfs4_client *clp)
221 return clp->cl_lockowner_id ++;
224 static struct nfs4_state_owner *
225 nfs4_client_grab_unused(struct nfs4_client *clp, struct rpc_cred *cred)
227 struct nfs4_state_owner *sp = NULL;
229 if (!list_empty(&clp->cl_unused)) {
230 sp = list_entry(clp->cl_unused.next, struct nfs4_state_owner, so_list);
231 atomic_inc(&sp->so_count);
233 list_move(&sp->so_list, &clp->cl_state_owners);
239 static struct nfs4_state_owner *
240 nfs4_find_state_owner(struct nfs4_client *clp, struct rpc_cred *cred)
242 struct nfs4_state_owner *sp, *res = NULL;
244 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
245 if (sp->so_cred != cred)
247 atomic_inc(&sp->so_count);
248 /* Move to the head of the list */
249 list_move(&sp->so_list, &clp->cl_state_owners);
257 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
258 * create a new state_owner.
261 static struct nfs4_state_owner *
262 nfs4_alloc_state_owner(void)
264 struct nfs4_state_owner *sp;
266 sp = kmalloc(sizeof(*sp),GFP_KERNEL);
269 init_MUTEX(&sp->so_sema);
270 sp->so_seqid = 0; /* arbitrary */
271 INIT_LIST_HEAD(&sp->so_states);
272 INIT_LIST_HEAD(&sp->so_delegations);
273 atomic_set(&sp->so_count, 1);
278 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
280 struct nfs4_client *clp = sp->so_client;
281 spin_lock(&clp->cl_lock);
282 list_del_init(&sp->so_list);
283 spin_unlock(&clp->cl_lock);
287 * Note: must be called with clp->cl_sem held in order to prevent races
288 * with reboot recovery!
290 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
292 struct nfs4_client *clp = server->nfs4_state;
293 struct nfs4_state_owner *sp, *new;
296 new = nfs4_alloc_state_owner();
297 spin_lock(&clp->cl_lock);
298 sp = nfs4_find_state_owner(clp, cred);
300 sp = nfs4_client_grab_unused(clp, cred);
301 if (sp == NULL && new != NULL) {
302 list_add(&new->so_list, &clp->cl_state_owners);
303 new->so_client = clp;
304 new->so_id = nfs4_alloc_lockowner_id(clp);
309 spin_unlock(&clp->cl_lock);
319 * Must be called with clp->cl_sem held in order to avoid races
320 * with state recovery...
322 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
324 struct nfs4_client *clp = sp->so_client;
325 struct rpc_cred *cred = sp->so_cred;
327 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
329 if (clp->cl_nunused >= OPENOWNER_POOL_SIZE)
331 if (list_empty(&sp->so_list))
333 list_move(&sp->so_list, &clp->cl_unused);
335 spin_unlock(&clp->cl_lock);
340 list_del(&sp->so_list);
341 spin_unlock(&clp->cl_lock);
346 static struct nfs4_state *
347 nfs4_alloc_open_state(void)
349 struct nfs4_state *state;
351 state = kmalloc(sizeof(*state), GFP_KERNEL);
358 memset(state->stateid.data, 0, sizeof(state->stateid.data));
359 atomic_set(&state->count, 1);
360 INIT_LIST_HEAD(&state->lock_states);
361 init_MUTEX(&state->lock_sema);
362 rwlock_init(&state->state_lock);
366 static struct nfs4_state *
367 __nfs4_find_state(struct inode *inode, struct rpc_cred *cred, mode_t mode)
369 struct nfs_inode *nfsi = NFS_I(inode);
370 struct nfs4_state *state;
372 mode &= (FMODE_READ|FMODE_WRITE);
373 list_for_each_entry(state, &nfsi->open_states, inode_states) {
374 if (state->owner->so_cred != cred)
376 if ((mode & FMODE_READ) != 0 && state->nreaders == 0)
378 if ((mode & FMODE_WRITE) != 0 && state->nwriters == 0)
380 if ((state->state & mode) != mode)
382 atomic_inc(&state->count);
383 if (mode & FMODE_READ)
385 if (mode & FMODE_WRITE)
392 static struct nfs4_state *
393 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
395 struct nfs_inode *nfsi = NFS_I(inode);
396 struct nfs4_state *state;
398 list_for_each_entry(state, &nfsi->open_states, inode_states) {
399 /* Is this in the process of being freed? */
400 if (state->nreaders == 0 && state->nwriters == 0)
402 if (state->owner == owner) {
403 atomic_inc(&state->count);
411 nfs4_find_state(struct inode *inode, struct rpc_cred *cred, mode_t mode)
413 struct nfs4_state *state;
415 spin_lock(&inode->i_lock);
416 state = __nfs4_find_state(inode, cred, mode);
417 spin_unlock(&inode->i_lock);
422 nfs4_free_open_state(struct nfs4_state *state)
428 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
430 struct nfs4_state *state, *new;
431 struct nfs_inode *nfsi = NFS_I(inode);
433 spin_lock(&inode->i_lock);
434 state = __nfs4_find_state_byowner(inode, owner);
435 spin_unlock(&inode->i_lock);
438 new = nfs4_alloc_open_state();
439 spin_lock(&inode->i_lock);
440 state = __nfs4_find_state_byowner(inode, owner);
441 if (state == NULL && new != NULL) {
443 /* Caller *must* be holding owner->so_sem */
444 /* Note: The reclaim code dictates that we add stateless
445 * and read-only stateids to the end of the list */
446 list_add_tail(&state->open_states, &owner->so_states);
447 state->owner = owner;
448 atomic_inc(&owner->so_count);
449 list_add(&state->inode_states, &nfsi->open_states);
450 state->inode = igrab(inode);
451 spin_unlock(&inode->i_lock);
453 spin_unlock(&inode->i_lock);
455 nfs4_free_open_state(new);
462 * Beware! Caller must be holding exactly one
463 * reference to clp->cl_sem and owner->so_sema!
465 void nfs4_put_open_state(struct nfs4_state *state)
467 struct inode *inode = state->inode;
468 struct nfs4_state_owner *owner = state->owner;
470 if (!atomic_dec_and_lock(&state->count, &inode->i_lock))
472 if (!list_empty(&state->inode_states))
473 list_del(&state->inode_states);
474 spin_unlock(&inode->i_lock);
475 list_del(&state->open_states);
477 BUG_ON (state->state != 0);
478 nfs4_free_open_state(state);
479 nfs4_put_state_owner(owner);
483 * 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 down(&owner->so_sema);
496 /* Protect against nfs4_find_state() */
497 spin_lock(&inode->i_lock);
498 if (mode & FMODE_READ)
500 if (mode & FMODE_WRITE)
502 if (state->nwriters == 0) {
503 if (state->nreaders == 0)
504 list_del_init(&state->inode_states);
505 /* See reclaim code */
506 list_move_tail(&state->open_states, &owner->so_states);
508 spin_unlock(&inode->i_lock);
510 if (state->state != 0) {
512 newstate |= FMODE_READ;
514 newstate |= FMODE_WRITE;
515 if (state->state == newstate)
517 if (nfs4_do_close(inode, state, newstate) == -EINPROGRESS)
521 nfs4_put_open_state(state);
523 nfs4_put_state_owner(owner);
524 up_read(&clp->cl_sem);
528 * Search the state->lock_states for an existing lock_owner
529 * that is compatible with current->files
531 static struct nfs4_lock_state *
532 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
534 struct nfs4_lock_state *pos;
535 list_for_each_entry(pos, &state->lock_states, ls_locks) {
536 if (pos->ls_owner != fl_owner)
538 atomic_inc(&pos->ls_count);
544 struct nfs4_lock_state *
545 nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
547 struct nfs4_lock_state *lsp;
548 read_lock(&state->state_lock);
549 lsp = __nfs4_find_lock_state(state, fl_owner);
550 read_unlock(&state->state_lock);
555 * Return a compatible lock_state. If no initialized lock_state structure
556 * exists, return an uninitialized one.
558 * The caller must be holding state->lock_sema
560 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
562 struct nfs4_lock_state *lsp;
563 struct nfs4_client *clp = state->owner->so_client;
565 lsp = kmalloc(sizeof(*lsp), GFP_KERNEL);
569 lsp->ls_seqid = 0; /* arbitrary */
571 memset(lsp->ls_stateid.data, 0, sizeof(lsp->ls_stateid.data));
572 atomic_set(&lsp->ls_count, 1);
573 lsp->ls_owner = fl_owner;
574 INIT_LIST_HEAD(&lsp->ls_locks);
575 spin_lock(&clp->cl_lock);
576 lsp->ls_id = nfs4_alloc_lockowner_id(clp);
577 spin_unlock(&clp->cl_lock);
582 * Return a compatible lock_state. If no initialized lock_state structure
583 * exists, return an uninitialized one.
585 * The caller must be holding state->lock_sema and clp->cl_sem
587 struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
589 struct nfs4_lock_state * lsp;
591 lsp = nfs4_find_lock_state(state, owner);
593 lsp = nfs4_alloc_lock_state(state, owner);
598 * Byte-range lock aware utility to initialize the stateid of read/write
602 nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
604 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
605 struct nfs4_lock_state *lsp;
607 lsp = nfs4_find_lock_state(state, fl_owner);
609 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
610 nfs4_put_lock_state(lsp);
614 memcpy(dst, &state->stateid, sizeof(*dst));
618 * Called with state->lock_sema and clp->cl_sem held.
620 void nfs4_increment_lock_seqid(int status, struct nfs4_lock_state *lsp)
622 if (status == NFS_OK || seqid_mutating_err(-status))
627 * Check to see if the request lock (type FL_UNLK) effects the fl lock.
629 * fl and request must have the same posix owner
632 * 0 -> fl not effected by request
633 * 1 -> fl consumed by request
637 nfs4_check_unlock(struct file_lock *fl, struct file_lock *request)
639 if (fl->fl_start >= request->fl_start && fl->fl_end <= request->fl_end)
645 * Post an initialized lock_state on the state->lock_states list.
647 void nfs4_notify_setlk(struct nfs4_state *state, struct file_lock *request, struct nfs4_lock_state *lsp)
649 if (!list_empty(&lsp->ls_locks))
651 atomic_inc(&lsp->ls_count);
652 write_lock(&state->state_lock);
653 list_add(&lsp->ls_locks, &state->lock_states);
654 set_bit(LK_STATE_IN_USE, &state->flags);
655 write_unlock(&state->state_lock);
659 * to decide to 'reap' lock state:
660 * 1) search i_flock for file_locks with fl.lock_state = to ls.
661 * 2) determine if unlock will consume found lock.
668 nfs4_notify_unlck(struct nfs4_state *state, struct file_lock *request, struct nfs4_lock_state *lsp)
670 struct inode *inode = state->inode;
671 struct file_lock *fl;
673 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
674 if (!(fl->fl_flags & FL_POSIX))
676 if (fl->fl_owner != lsp->ls_owner)
678 /* Exit if we find at least one lock which is not consumed */
679 if (nfs4_check_unlock(fl,request) == 0)
683 write_lock(&state->state_lock);
684 list_del_init(&lsp->ls_locks);
685 if (list_empty(&state->lock_states))
686 clear_bit(LK_STATE_IN_USE, &state->flags);
687 write_unlock(&state->state_lock);
688 nfs4_put_lock_state(lsp);
692 * Release reference to lock_state, and free it if we see that
693 * it is no longer in use
696 nfs4_put_lock_state(struct nfs4_lock_state *lsp)
698 if (!atomic_dec_and_test(&lsp->ls_count))
700 BUG_ON (!list_empty(&lsp->ls_locks));
705 * Called with sp->so_sema and clp->cl_sem held.
707 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
708 * failed with a seqid incrementing error -
709 * see comments nfs_fs.h:seqid_mutating_error()
711 void nfs4_increment_seqid(int status, struct nfs4_state_owner *sp)
713 if (status == NFS_OK || seqid_mutating_err(-status))
715 /* If the server returns BAD_SEQID, unhash state_owner here */
716 if (status == -NFS4ERR_BAD_SEQID)
717 nfs4_drop_state_owner(sp);
720 static int reclaimer(void *);
721 struct reclaimer_args {
722 struct nfs4_client *clp;
723 struct completion complete;
727 * State recovery routine
730 nfs4_recover_state(void *data)
732 struct nfs4_client *clp = (struct nfs4_client *)data;
733 struct reclaimer_args args = {
738 init_completion(&args.complete);
740 if (kernel_thread(reclaimer, &args, CLONE_KERNEL) < 0)
741 goto out_failed_clear;
742 wait_for_completion(&args.complete);
745 set_bit(NFS4CLNT_OK, &clp->cl_state);
746 wake_up_all(&clp->cl_waitq);
747 rpc_wake_up(&clp->cl_rpcwaitq);
751 * Schedule a state recovery attempt
754 nfs4_schedule_state_recovery(struct nfs4_client *clp)
758 if (test_and_clear_bit(NFS4CLNT_OK, &clp->cl_state))
759 schedule_work(&clp->cl_recoverd);
762 static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state)
764 struct inode *inode = state->inode;
765 struct file_lock *fl;
768 for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
769 if (!(fl->fl_flags & FL_POSIX))
771 if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state)
773 status = ops->recover_lock(state, fl);
778 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
779 __FUNCTION__, status);
780 case -NFS4ERR_EXPIRED:
781 case -NFS4ERR_NO_GRACE:
782 case -NFS4ERR_RECLAIM_BAD:
783 case -NFS4ERR_RECLAIM_CONFLICT:
784 /* kill_proc(fl->fl_owner, SIGLOST, 1); */
786 case -NFS4ERR_STALE_CLIENTID:
795 static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp)
797 struct nfs4_state *state;
798 struct nfs4_lock_state *lock;
801 /* Note: we rely on the sp->so_states list being ordered
802 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
804 * This is needed to ensure that the server won't give us any
805 * read delegations that we have to return if, say, we are
806 * recovering after a network partition or a reboot from a
807 * server that doesn't support a grace period.
809 list_for_each_entry(state, &sp->so_states, open_states) {
810 if (state->state == 0)
812 status = ops->recover_open(sp, state);
813 list_for_each_entry(lock, &state->lock_states, ls_locks)
814 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
816 status = nfs4_reclaim_locks(ops, state);
819 list_for_each_entry(lock, &state->lock_states, ls_locks) {
820 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
821 printk("%s: Lock reclaim failed!\n",
828 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
829 __FUNCTION__, status);
831 case -NFS4ERR_RECLAIM_BAD:
832 case -NFS4ERR_RECLAIM_CONFLICT:
834 * Open state on this file cannot be recovered
835 * All we can do is revert to using the zero stateid.
837 memset(state->stateid.data, 0,
838 sizeof(state->stateid.data));
839 /* Mark the file as being 'closed' */
842 case -NFS4ERR_EXPIRED:
843 case -NFS4ERR_NO_GRACE:
844 case -NFS4ERR_STALE_CLIENTID:
853 static int reclaimer(void *ptr)
855 struct reclaimer_args *args = (struct reclaimer_args *)ptr;
856 struct nfs4_client *clp = args->clp;
857 struct nfs4_state_owner *sp;
858 struct nfs4_state_recovery_ops *ops;
861 daemonize("%u.%u.%u.%u-reclaim", NIPQUAD(clp->cl_addr));
862 allow_signal(SIGKILL);
864 atomic_inc(&clp->cl_count);
865 complete(&args->complete);
867 /* Ensure exclusive access to NFSv4 state */
869 down_write(&clp->cl_sem);
870 /* Are there any NFS mounts out there? */
871 if (list_empty(&clp->cl_superblocks))
874 status = nfs4_proc_renew(clp);
877 case -NFS4ERR_CB_PATH_DOWN:
879 case -NFS4ERR_STALE_CLIENTID:
880 case -NFS4ERR_LEASE_MOVED:
881 ops = &nfs4_reboot_recovery_ops;
884 ops = &nfs4_network_partition_recovery_ops;
886 status = __nfs4_init_client(clp);
889 /* Mark all delegations for reclaim */
890 nfs_delegation_mark_reclaim(clp);
891 /* Note: list is protected by exclusive lock on cl->cl_sem */
892 list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
893 status = nfs4_reclaim_open_state(ops, sp);
895 if (status == -NFS4ERR_NO_GRACE) {
896 ops = &nfs4_network_partition_recovery_ops;
897 status = nfs4_reclaim_open_state(ops, sp);
899 if (status == -NFS4ERR_STALE_CLIENTID)
901 if (status == -NFS4ERR_EXPIRED)
905 nfs_delegation_reap_unclaimed(clp);
907 set_bit(NFS4CLNT_OK, &clp->cl_state);
908 up_write(&clp->cl_sem);
910 wake_up_all(&clp->cl_waitq);
911 rpc_wake_up(&clp->cl_rpcwaitq);
912 if (status == -NFS4ERR_CB_PATH_DOWN)
913 nfs_handle_cb_pathdown(clp);
914 nfs4_put_client(clp);
917 printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n",
918 NIPQUAD(clp->cl_addr.s_addr), -status);