1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/nfs/delegation.c
5 * Copyright (C) 2004 Trond Myklebust
7 * NFS file delegation management
10 #include <linux/completion.h>
11 #include <linux/kthread.h>
12 #include <linux/module.h>
13 #include <linux/sched.h>
14 #include <linux/slab.h>
15 #include <linux/spinlock.h>
16 #include <linux/iversion.h>
18 #include <linux/nfs4.h>
19 #include <linux/nfs_fs.h>
20 #include <linux/nfs_xdr.h>
23 #include "nfs4session.h"
24 #include "delegation.h"
26 #include "nfs4trace.h"
28 static void nfs_free_delegation(struct nfs_delegation
*delegation
)
30 put_cred(delegation
->cred
);
31 delegation
->cred
= NULL
;
32 kfree_rcu(delegation
, rcu
);
36 * nfs_mark_delegation_referenced - set delegation's REFERENCED flag
37 * @delegation: delegation to process
40 void nfs_mark_delegation_referenced(struct nfs_delegation
*delegation
)
42 set_bit(NFS_DELEGATION_REFERENCED
, &delegation
->flags
);
46 nfs4_is_valid_delegation(const struct nfs_delegation
*delegation
,
49 if (delegation
!= NULL
&& (delegation
->type
& flags
) == flags
&&
50 !test_bit(NFS_DELEGATION_REVOKED
, &delegation
->flags
) &&
51 !test_bit(NFS_DELEGATION_RETURNING
, &delegation
->flags
))
57 nfs4_do_check_delegation(struct inode
*inode
, fmode_t flags
, bool mark
)
59 struct nfs_delegation
*delegation
;
62 flags
&= FMODE_READ
|FMODE_WRITE
;
64 delegation
= rcu_dereference(NFS_I(inode
)->delegation
);
65 if (nfs4_is_valid_delegation(delegation
, flags
)) {
67 nfs_mark_delegation_referenced(delegation
);
74 * nfs_have_delegation - check if inode has a delegation, mark it
75 * NFS_DELEGATION_REFERENCED if there is one.
76 * @inode: inode to check
77 * @flags: delegation types to check for
79 * Returns one if inode has the indicated delegation, otherwise zero.
81 int nfs4_have_delegation(struct inode
*inode
, fmode_t flags
)
83 return nfs4_do_check_delegation(inode
, flags
, true);
87 * nfs4_check_delegation - check if inode has a delegation, do not mark
88 * NFS_DELEGATION_REFERENCED if it has one.
90 int nfs4_check_delegation(struct inode
*inode
, fmode_t flags
)
92 return nfs4_do_check_delegation(inode
, flags
, false);
95 static int nfs_delegation_claim_locks(struct nfs4_state
*state
, const nfs4_stateid
*stateid
)
97 struct inode
*inode
= state
->inode
;
99 struct file_lock_context
*flctx
= inode
->i_flctx
;
100 struct list_head
*list
;
106 list
= &flctx
->flc_posix
;
107 spin_lock(&flctx
->flc_lock
);
109 list_for_each_entry(fl
, list
, fl_list
) {
110 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
112 spin_unlock(&flctx
->flc_lock
);
113 status
= nfs4_lock_delegation_recall(fl
, state
, stateid
);
116 spin_lock(&flctx
->flc_lock
);
118 if (list
== &flctx
->flc_posix
) {
119 list
= &flctx
->flc_flock
;
122 spin_unlock(&flctx
->flc_lock
);
127 static int nfs_delegation_claim_opens(struct inode
*inode
,
128 const nfs4_stateid
*stateid
, fmode_t type
)
130 struct nfs_inode
*nfsi
= NFS_I(inode
);
131 struct nfs_open_context
*ctx
;
132 struct nfs4_state_owner
*sp
;
133 struct nfs4_state
*state
;
139 list_for_each_entry_rcu(ctx
, &nfsi
->open_files
, list
) {
143 if (!test_bit(NFS_DELEGATED_STATE
, &state
->flags
))
145 if (!nfs4_valid_open_stateid(state
))
147 if (!nfs4_stateid_match(&state
->stateid
, stateid
))
149 if (!get_nfs_open_context(ctx
))
153 /* Block nfs4_proc_unlck */
154 mutex_lock(&sp
->so_delegreturn_mutex
);
155 seq
= raw_seqcount_begin(&sp
->so_reclaim_seqcount
);
156 err
= nfs4_open_delegation_recall(ctx
, state
, stateid
);
158 err
= nfs_delegation_claim_locks(state
, stateid
);
159 if (!err
&& read_seqcount_retry(&sp
->so_reclaim_seqcount
, seq
))
161 mutex_unlock(&sp
->so_delegreturn_mutex
);
162 put_nfs_open_context(ctx
);
172 * nfs_inode_reclaim_delegation - process a delegation reclaim request
173 * @inode: inode to process
174 * @cred: credential to use for request
175 * @type: delegation type
176 * @stateid: delegation stateid
177 * @pagemod_limit: write delegation "space_limit"
180 void nfs_inode_reclaim_delegation(struct inode
*inode
, const struct cred
*cred
,
182 const nfs4_stateid
*stateid
,
183 unsigned long pagemod_limit
)
185 struct nfs_delegation
*delegation
;
186 const struct cred
*oldcred
= NULL
;
189 delegation
= rcu_dereference(NFS_I(inode
)->delegation
);
190 if (delegation
!= NULL
) {
191 spin_lock(&delegation
->lock
);
192 if (delegation
->inode
!= NULL
) {
193 nfs4_stateid_copy(&delegation
->stateid
, stateid
);
194 delegation
->type
= type
;
195 delegation
->pagemod_limit
= pagemod_limit
;
196 oldcred
= delegation
->cred
;
197 delegation
->cred
= get_cred(cred
);
198 clear_bit(NFS_DELEGATION_NEED_RECLAIM
,
200 spin_unlock(&delegation
->lock
);
203 trace_nfs4_reclaim_delegation(inode
, type
);
206 /* We appear to have raced with a delegation return. */
207 spin_unlock(&delegation
->lock
);
210 nfs_inode_set_delegation(inode
, cred
, type
, stateid
, pagemod_limit
);
213 static int nfs_do_return_delegation(struct inode
*inode
, struct nfs_delegation
*delegation
, int issync
)
217 if (!test_bit(NFS_DELEGATION_REVOKED
, &delegation
->flags
))
218 res
= nfs4_proc_delegreturn(inode
,
220 &delegation
->stateid
,
222 nfs_free_delegation(delegation
);
226 static struct inode
*nfs_delegation_grab_inode(struct nfs_delegation
*delegation
)
228 struct inode
*inode
= NULL
;
230 spin_lock(&delegation
->lock
);
231 if (delegation
->inode
!= NULL
)
232 inode
= igrab(delegation
->inode
);
234 set_bit(NFS_DELEGATION_INODE_FREEING
, &delegation
->flags
);
235 spin_unlock(&delegation
->lock
);
239 static struct nfs_delegation
*
240 nfs_start_delegation_return_locked(struct nfs_inode
*nfsi
)
242 struct nfs_delegation
*ret
= NULL
;
243 struct nfs_delegation
*delegation
= rcu_dereference(nfsi
->delegation
);
245 if (delegation
== NULL
)
247 spin_lock(&delegation
->lock
);
248 if (!test_and_set_bit(NFS_DELEGATION_RETURNING
, &delegation
->flags
))
250 spin_unlock(&delegation
->lock
);
255 static struct nfs_delegation
*
256 nfs_start_delegation_return(struct nfs_inode
*nfsi
)
258 struct nfs_delegation
*delegation
;
261 delegation
= nfs_start_delegation_return_locked(nfsi
);
267 nfs_abort_delegation_return(struct nfs_delegation
*delegation
,
268 struct nfs_client
*clp
)
271 spin_lock(&delegation
->lock
);
272 clear_bit(NFS_DELEGATION_RETURNING
, &delegation
->flags
);
273 set_bit(NFS_DELEGATION_RETURN
, &delegation
->flags
);
274 spin_unlock(&delegation
->lock
);
275 set_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
);
278 static struct nfs_delegation
*
279 nfs_detach_delegation_locked(struct nfs_inode
*nfsi
,
280 struct nfs_delegation
*delegation
,
281 struct nfs_client
*clp
)
283 struct nfs_delegation
*deleg_cur
=
284 rcu_dereference_protected(nfsi
->delegation
,
285 lockdep_is_held(&clp
->cl_lock
));
287 if (deleg_cur
== NULL
|| delegation
!= deleg_cur
)
290 spin_lock(&delegation
->lock
);
291 set_bit(NFS_DELEGATION_RETURNING
, &delegation
->flags
);
292 list_del_rcu(&delegation
->super_list
);
293 delegation
->inode
= NULL
;
294 rcu_assign_pointer(nfsi
->delegation
, NULL
);
295 spin_unlock(&delegation
->lock
);
299 static struct nfs_delegation
*nfs_detach_delegation(struct nfs_inode
*nfsi
,
300 struct nfs_delegation
*delegation
,
301 struct nfs_server
*server
)
303 struct nfs_client
*clp
= server
->nfs_client
;
305 spin_lock(&clp
->cl_lock
);
306 delegation
= nfs_detach_delegation_locked(nfsi
, delegation
, clp
);
307 spin_unlock(&clp
->cl_lock
);
311 static struct nfs_delegation
*
312 nfs_inode_detach_delegation(struct inode
*inode
)
314 struct nfs_inode
*nfsi
= NFS_I(inode
);
315 struct nfs_server
*server
= NFS_SERVER(inode
);
316 struct nfs_delegation
*delegation
;
318 delegation
= nfs_start_delegation_return(nfsi
);
319 if (delegation
== NULL
)
321 return nfs_detach_delegation(nfsi
, delegation
, server
);
325 nfs_update_inplace_delegation(struct nfs_delegation
*delegation
,
326 const struct nfs_delegation
*update
)
328 if (nfs4_stateid_is_newer(&update
->stateid
, &delegation
->stateid
)) {
329 delegation
->stateid
.seqid
= update
->stateid
.seqid
;
331 delegation
->type
= update
->type
;
336 * nfs_inode_set_delegation - set up a delegation on an inode
337 * @inode: inode to which delegation applies
338 * @cred: cred to use for subsequent delegation processing
339 * @type: delegation type
340 * @stateid: delegation stateid
341 * @pagemod_limit: write delegation "space_limit"
343 * Returns zero on success, or a negative errno value.
345 int nfs_inode_set_delegation(struct inode
*inode
, const struct cred
*cred
,
347 const nfs4_stateid
*stateid
,
348 unsigned long pagemod_limit
)
350 struct nfs_server
*server
= NFS_SERVER(inode
);
351 struct nfs_client
*clp
= server
->nfs_client
;
352 struct nfs_inode
*nfsi
= NFS_I(inode
);
353 struct nfs_delegation
*delegation
, *old_delegation
;
354 struct nfs_delegation
*freeme
= NULL
;
357 delegation
= kmalloc(sizeof(*delegation
), GFP_NOFS
);
358 if (delegation
== NULL
)
360 nfs4_stateid_copy(&delegation
->stateid
, stateid
);
361 delegation
->type
= type
;
362 delegation
->pagemod_limit
= pagemod_limit
;
363 delegation
->change_attr
= inode_peek_iversion_raw(inode
);
364 delegation
->cred
= get_cred(cred
);
365 delegation
->inode
= inode
;
366 delegation
->flags
= 1<<NFS_DELEGATION_REFERENCED
;
367 spin_lock_init(&delegation
->lock
);
369 spin_lock(&clp
->cl_lock
);
370 old_delegation
= rcu_dereference_protected(nfsi
->delegation
,
371 lockdep_is_held(&clp
->cl_lock
));
372 if (old_delegation
!= NULL
) {
373 /* Is this an update of the existing delegation? */
374 if (nfs4_stateid_match_other(&old_delegation
->stateid
,
375 &delegation
->stateid
)) {
376 nfs_update_inplace_delegation(old_delegation
,
381 * Deal with broken servers that hand out two
382 * delegations for the same file.
383 * Allow for upgrades to a WRITE delegation, but
386 dfprintk(FILE, "%s: server %s handed out "
387 "a duplicate delegation!\n",
388 __func__
, clp
->cl_hostname
);
389 if (delegation
->type
== old_delegation
->type
||
390 !(delegation
->type
& FMODE_WRITE
)) {
395 if (test_and_set_bit(NFS_DELEGATION_RETURNING
,
396 &old_delegation
->flags
))
398 freeme
= nfs_detach_delegation_locked(nfsi
,
399 old_delegation
, clp
);
403 list_add_tail_rcu(&delegation
->super_list
, &server
->delegations
);
404 rcu_assign_pointer(nfsi
->delegation
, delegation
);
407 trace_nfs4_set_delegation(inode
, type
);
409 spin_lock(&inode
->i_lock
);
410 if (NFS_I(inode
)->cache_validity
& (NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ATIME
))
411 NFS_I(inode
)->cache_validity
|= NFS_INO_REVAL_FORCED
;
412 spin_unlock(&inode
->i_lock
);
414 spin_unlock(&clp
->cl_lock
);
415 if (delegation
!= NULL
)
416 nfs_free_delegation(delegation
);
418 nfs_do_return_delegation(inode
, freeme
, 0);
423 * Basic procedure for returning a delegation to the server
425 static int nfs_end_delegation_return(struct inode
*inode
, struct nfs_delegation
*delegation
, int issync
)
427 struct nfs_client
*clp
= NFS_SERVER(inode
)->nfs_client
;
428 struct nfs_inode
*nfsi
= NFS_I(inode
);
431 if (delegation
== NULL
)
434 if (test_bit(NFS_DELEGATION_REVOKED
, &delegation
->flags
))
436 err
= nfs_delegation_claim_opens(inode
, &delegation
->stateid
,
438 if (!issync
|| err
!= -EAGAIN
)
441 * Guard against state recovery
443 err
= nfs4_wait_clnt_recover(clp
);
447 nfs_abort_delegation_return(delegation
, clp
);
450 if (!nfs_detach_delegation(nfsi
, delegation
, NFS_SERVER(inode
)))
453 err
= nfs_do_return_delegation(inode
, delegation
, issync
);
458 static bool nfs_delegation_need_return(struct nfs_delegation
*delegation
)
462 if (test_bit(NFS_DELEGATION_RETURNING
, &delegation
->flags
))
464 if (test_and_clear_bit(NFS_DELEGATION_RETURN
, &delegation
->flags
))
466 if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED
, &delegation
->flags
) && !ret
) {
469 spin_lock(&delegation
->lock
);
470 inode
= delegation
->inode
;
471 if (inode
&& list_empty(&NFS_I(inode
)->open_files
))
473 spin_unlock(&delegation
->lock
);
480 * nfs_client_return_marked_delegations - return previously marked delegations
481 * @clp: nfs_client to process
483 * Note that this function is designed to be called by the state
484 * manager thread. For this reason, it cannot flush the dirty data,
485 * since that could deadlock in case of a state recovery error.
487 * Returns zero on success, or a negative errno value.
489 int nfs_client_return_marked_delegations(struct nfs_client
*clp
)
491 struct nfs_delegation
*delegation
;
492 struct nfs_delegation
*prev
;
493 struct nfs_server
*server
;
495 struct inode
*place_holder
= NULL
;
496 struct nfs_delegation
*place_holder_deleg
= NULL
;
501 * To avoid quadratic looping we hold a reference
502 * to an inode place_holder. Each time we restart, we
503 * list nfs_servers from the server of that inode, and
504 * delegation in the server from the delegations of that
506 * prev is an RCU-protected pointer to a delegation which
507 * wasn't marked for return and might be a good choice for
508 * the next place_holder.
513 server
= NFS_SERVER(place_holder
);
515 server
= list_entry_rcu(clp
->cl_superblocks
.next
,
516 struct nfs_server
, client_link
);
517 list_for_each_entry_from_rcu(server
, &clp
->cl_superblocks
, client_link
) {
519 if (place_holder
&& server
== NFS_SERVER(place_holder
))
520 delegation
= rcu_dereference(NFS_I(place_holder
)->delegation
);
521 if (!delegation
|| delegation
!= place_holder_deleg
)
522 delegation
= list_entry_rcu(server
->delegations
.next
,
523 struct nfs_delegation
, super_list
);
524 list_for_each_entry_from_rcu(delegation
, &server
->delegations
, super_list
) {
525 struct inode
*to_put
= NULL
;
527 if (!nfs_delegation_need_return(delegation
)) {
531 if (!nfs_sb_active(server
->super
))
532 break; /* continue in outer loop */
537 tmp
= nfs_delegation_grab_inode(prev
);
539 to_put
= place_holder
;
541 place_holder_deleg
= prev
;
545 inode
= nfs_delegation_grab_inode(delegation
);
550 nfs_sb_deactive(server
->super
);
553 delegation
= nfs_start_delegation_return_locked(NFS_I(inode
));
559 err
= nfs_end_delegation_return(inode
, delegation
, 0);
561 nfs_sb_deactive(server
->super
);
565 set_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
);
578 * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens
579 * @inode: inode to process
581 * Does not protect against delegation reclaims, therefore really only safe
582 * to be called from nfs4_clear_inode().
584 void nfs_inode_return_delegation_noreclaim(struct inode
*inode
)
586 struct nfs_delegation
*delegation
;
588 delegation
= nfs_inode_detach_delegation(inode
);
589 if (delegation
!= NULL
)
590 nfs_do_return_delegation(inode
, delegation
, 1);
594 * nfs_inode_return_delegation - synchronously return a delegation
595 * @inode: inode to process
597 * This routine will always flush any dirty data to disk on the
598 * assumption that if we need to return the delegation, then
599 * we should stop caching.
601 * Returns zero on success, or a negative errno value.
603 int nfs4_inode_return_delegation(struct inode
*inode
)
605 struct nfs_inode
*nfsi
= NFS_I(inode
);
606 struct nfs_delegation
*delegation
;
610 delegation
= nfs_start_delegation_return(nfsi
);
611 if (delegation
!= NULL
)
612 err
= nfs_end_delegation_return(inode
, delegation
, 1);
617 * nfs4_inode_make_writeable
618 * @inode: pointer to inode
620 * Make the inode writeable by returning the delegation if necessary
622 * Returns zero on success, or a negative errno value.
624 int nfs4_inode_make_writeable(struct inode
*inode
)
626 if (!nfs4_has_session(NFS_SERVER(inode
)->nfs_client
) ||
627 !nfs4_check_delegation(inode
, FMODE_WRITE
))
628 return nfs4_inode_return_delegation(inode
);
632 static void nfs_mark_return_if_closed_delegation(struct nfs_server
*server
,
633 struct nfs_delegation
*delegation
)
635 set_bit(NFS_DELEGATION_RETURN_IF_CLOSED
, &delegation
->flags
);
636 set_bit(NFS4CLNT_DELEGRETURN
, &server
->nfs_client
->cl_state
);
639 static void nfs_mark_return_delegation(struct nfs_server
*server
,
640 struct nfs_delegation
*delegation
)
642 set_bit(NFS_DELEGATION_RETURN
, &delegation
->flags
);
643 set_bit(NFS4CLNT_DELEGRETURN
, &server
->nfs_client
->cl_state
);
646 static bool nfs_server_mark_return_all_delegations(struct nfs_server
*server
)
648 struct nfs_delegation
*delegation
;
651 list_for_each_entry_rcu(delegation
, &server
->delegations
, super_list
) {
652 nfs_mark_return_delegation(server
, delegation
);
658 static void nfs_client_mark_return_all_delegations(struct nfs_client
*clp
)
660 struct nfs_server
*server
;
663 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
664 nfs_server_mark_return_all_delegations(server
);
668 static void nfs_delegation_run_state_manager(struct nfs_client
*clp
)
670 if (test_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
))
671 nfs4_schedule_state_manager(clp
);
675 * nfs_expire_all_delegations
676 * @clp: client to process
679 void nfs_expire_all_delegations(struct nfs_client
*clp
)
681 nfs_client_mark_return_all_delegations(clp
);
682 nfs_delegation_run_state_manager(clp
);
686 * nfs_super_return_all_delegations - return delegations for one superblock
687 * @server: pointer to nfs_server to process
690 void nfs_server_return_all_delegations(struct nfs_server
*server
)
692 struct nfs_client
*clp
= server
->nfs_client
;
699 need_wait
= nfs_server_mark_return_all_delegations(server
);
703 nfs4_schedule_state_manager(clp
);
704 nfs4_wait_clnt_recover(clp
);
708 static void nfs_mark_return_unused_delegation_types(struct nfs_server
*server
,
711 struct nfs_delegation
*delegation
;
713 list_for_each_entry_rcu(delegation
, &server
->delegations
, super_list
) {
714 if ((delegation
->type
== (FMODE_READ
|FMODE_WRITE
)) && !(flags
& FMODE_WRITE
))
716 if (delegation
->type
& flags
)
717 nfs_mark_return_if_closed_delegation(server
, delegation
);
721 static void nfs_client_mark_return_unused_delegation_types(struct nfs_client
*clp
,
724 struct nfs_server
*server
;
727 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
728 nfs_mark_return_unused_delegation_types(server
, flags
);
732 static void nfs_mark_delegation_revoked(struct nfs_server
*server
,
733 struct nfs_delegation
*delegation
)
735 set_bit(NFS_DELEGATION_REVOKED
, &delegation
->flags
);
736 delegation
->stateid
.type
= NFS4_INVALID_STATEID_TYPE
;
737 nfs_mark_return_delegation(server
, delegation
);
740 static bool nfs_revoke_delegation(struct inode
*inode
,
741 const nfs4_stateid
*stateid
)
743 struct nfs_delegation
*delegation
;
748 delegation
= rcu_dereference(NFS_I(inode
)->delegation
);
749 if (delegation
== NULL
)
751 if (stateid
== NULL
) {
752 nfs4_stateid_copy(&tmp
, &delegation
->stateid
);
754 } else if (!nfs4_stateid_match(stateid
, &delegation
->stateid
))
756 nfs_mark_delegation_revoked(NFS_SERVER(inode
), delegation
);
761 nfs_inode_find_state_and_recover(inode
, stateid
);
765 void nfs_remove_bad_delegation(struct inode
*inode
,
766 const nfs4_stateid
*stateid
)
768 struct nfs_delegation
*delegation
;
770 if (!nfs_revoke_delegation(inode
, stateid
))
772 delegation
= nfs_inode_detach_delegation(inode
);
774 nfs_free_delegation(delegation
);
776 EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation
);
779 * nfs_expire_unused_delegation_types
780 * @clp: client to process
781 * @flags: delegation types to expire
784 void nfs_expire_unused_delegation_types(struct nfs_client
*clp
, fmode_t flags
)
786 nfs_client_mark_return_unused_delegation_types(clp
, flags
);
787 nfs_delegation_run_state_manager(clp
);
790 static void nfs_mark_return_unreferenced_delegations(struct nfs_server
*server
)
792 struct nfs_delegation
*delegation
;
794 list_for_each_entry_rcu(delegation
, &server
->delegations
, super_list
) {
795 if (test_and_clear_bit(NFS_DELEGATION_REFERENCED
, &delegation
->flags
))
797 nfs_mark_return_if_closed_delegation(server
, delegation
);
802 * nfs_expire_unreferenced_delegations - Eliminate unused delegations
803 * @clp: nfs_client to process
806 void nfs_expire_unreferenced_delegations(struct nfs_client
*clp
)
808 struct nfs_server
*server
;
811 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
812 nfs_mark_return_unreferenced_delegations(server
);
815 nfs_delegation_run_state_manager(clp
);
819 * nfs_async_inode_return_delegation - asynchronously return a delegation
820 * @inode: inode to process
821 * @stateid: state ID information
823 * Returns zero on success, or a negative errno value.
825 int nfs_async_inode_return_delegation(struct inode
*inode
,
826 const nfs4_stateid
*stateid
)
828 struct nfs_server
*server
= NFS_SERVER(inode
);
829 struct nfs_client
*clp
= server
->nfs_client
;
830 struct nfs_delegation
*delegation
;
833 delegation
= rcu_dereference(NFS_I(inode
)->delegation
);
834 if (delegation
== NULL
)
836 if (stateid
!= NULL
&&
837 !clp
->cl_mvops
->match_stateid(&delegation
->stateid
, stateid
))
839 nfs_mark_return_delegation(server
, delegation
);
842 nfs_delegation_run_state_manager(clp
);
849 static struct inode
*
850 nfs_delegation_find_inode_server(struct nfs_server
*server
,
851 const struct nfs_fh
*fhandle
)
853 struct nfs_delegation
*delegation
;
854 struct inode
*freeme
, *res
= NULL
;
856 list_for_each_entry_rcu(delegation
, &server
->delegations
, super_list
) {
857 spin_lock(&delegation
->lock
);
858 if (delegation
->inode
!= NULL
&&
859 nfs_compare_fh(fhandle
, &NFS_I(delegation
->inode
)->fh
) == 0) {
860 freeme
= igrab(delegation
->inode
);
861 if (freeme
&& nfs_sb_active(freeme
->i_sb
))
863 spin_unlock(&delegation
->lock
);
871 return ERR_PTR(-EAGAIN
);
873 spin_unlock(&delegation
->lock
);
875 return ERR_PTR(-ENOENT
);
879 * nfs_delegation_find_inode - retrieve the inode associated with a delegation
880 * @clp: client state handle
881 * @fhandle: filehandle from a delegation recall
883 * Returns pointer to inode matching "fhandle," or NULL if a matching inode
886 struct inode
*nfs_delegation_find_inode(struct nfs_client
*clp
,
887 const struct nfs_fh
*fhandle
)
889 struct nfs_server
*server
;
893 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
894 res
= nfs_delegation_find_inode_server(server
, fhandle
);
895 if (res
!= ERR_PTR(-ENOENT
)) {
901 return ERR_PTR(-ENOENT
);
904 static void nfs_delegation_mark_reclaim_server(struct nfs_server
*server
)
906 struct nfs_delegation
*delegation
;
908 list_for_each_entry_rcu(delegation
, &server
->delegations
, super_list
) {
910 * If the delegation may have been admin revoked, then we
913 if (test_bit(NFS_DELEGATION_TEST_EXPIRED
, &delegation
->flags
))
915 set_bit(NFS_DELEGATION_NEED_RECLAIM
, &delegation
->flags
);
920 * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed
921 * @clp: nfs_client to process
924 void nfs_delegation_mark_reclaim(struct nfs_client
*clp
)
926 struct nfs_server
*server
;
929 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
930 nfs_delegation_mark_reclaim_server(server
);
935 * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done
936 * @clp: nfs_client to process
939 void nfs_delegation_reap_unclaimed(struct nfs_client
*clp
)
941 struct nfs_delegation
*delegation
;
942 struct nfs_server
*server
;
947 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
948 list_for_each_entry_rcu(delegation
, &server
->delegations
,
950 if (test_bit(NFS_DELEGATION_INODE_FREEING
,
951 &delegation
->flags
) ||
952 test_bit(NFS_DELEGATION_RETURNING
,
953 &delegation
->flags
) ||
954 test_bit(NFS_DELEGATION_NEED_RECLAIM
,
955 &delegation
->flags
) == 0)
957 if (!nfs_sb_active(server
->super
))
958 break; /* continue in outer loop */
959 inode
= nfs_delegation_grab_inode(delegation
);
962 nfs_sb_deactive(server
->super
);
965 delegation
= nfs_start_delegation_return_locked(NFS_I(inode
));
967 if (delegation
!= NULL
) {
968 delegation
= nfs_detach_delegation(NFS_I(inode
),
970 if (delegation
!= NULL
)
971 nfs_free_delegation(delegation
);
974 nfs_sb_deactive(server
->super
);
982 static inline bool nfs4_server_rebooted(const struct nfs_client
*clp
)
984 return (clp
->cl_state
& (BIT(NFS4CLNT_CHECK_LEASE
) |
985 BIT(NFS4CLNT_LEASE_EXPIRED
) |
986 BIT(NFS4CLNT_SESSION_RESET
))) != 0;
989 static void nfs_mark_test_expired_delegation(struct nfs_server
*server
,
990 struct nfs_delegation
*delegation
)
992 if (delegation
->stateid
.type
== NFS4_INVALID_STATEID_TYPE
)
994 clear_bit(NFS_DELEGATION_NEED_RECLAIM
, &delegation
->flags
);
995 set_bit(NFS_DELEGATION_TEST_EXPIRED
, &delegation
->flags
);
996 set_bit(NFS4CLNT_DELEGATION_EXPIRED
, &server
->nfs_client
->cl_state
);
999 static void nfs_inode_mark_test_expired_delegation(struct nfs_server
*server
,
1000 struct inode
*inode
)
1002 struct nfs_delegation
*delegation
;
1005 delegation
= rcu_dereference(NFS_I(inode
)->delegation
);
1007 nfs_mark_test_expired_delegation(server
, delegation
);
1012 static void nfs_delegation_mark_test_expired_server(struct nfs_server
*server
)
1014 struct nfs_delegation
*delegation
;
1016 list_for_each_entry_rcu(delegation
, &server
->delegations
, super_list
)
1017 nfs_mark_test_expired_delegation(server
, delegation
);
1021 * nfs_mark_test_expired_all_delegations - mark all delegations for testing
1022 * @clp: nfs_client to process
1024 * Iterates through all the delegations associated with this server and
1025 * marks them as needing to be checked for validity.
1027 void nfs_mark_test_expired_all_delegations(struct nfs_client
*clp
)
1029 struct nfs_server
*server
;
1032 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1033 nfs_delegation_mark_test_expired_server(server
);
1038 * nfs_test_expired_all_delegations - test all delegations for a client
1039 * @clp: nfs_client to process
1041 * Helper for handling "recallable state revoked" status from server.
1043 void nfs_test_expired_all_delegations(struct nfs_client
*clp
)
1045 nfs_mark_test_expired_all_delegations(clp
);
1046 nfs4_schedule_state_manager(clp
);
1050 nfs_delegation_test_free_expired(struct inode
*inode
,
1051 nfs4_stateid
*stateid
,
1052 const struct cred
*cred
)
1054 struct nfs_server
*server
= NFS_SERVER(inode
);
1055 const struct nfs4_minor_version_ops
*ops
= server
->nfs_client
->cl_mvops
;
1060 status
= ops
->test_and_free_expired(server
, stateid
, cred
);
1061 if (status
== -NFS4ERR_EXPIRED
|| status
== -NFS4ERR_BAD_STATEID
)
1062 nfs_remove_bad_delegation(inode
, stateid
);
1066 * nfs_reap_expired_delegations - reap expired delegations
1067 * @clp: nfs_client to process
1069 * Iterates through all the delegations associated with this server and
1070 * checks if they have may have been revoked. This function is usually
1071 * expected to be called in cases where the server may have lost its
1074 void nfs_reap_expired_delegations(struct nfs_client
*clp
)
1076 struct nfs_delegation
*delegation
;
1077 struct nfs_server
*server
;
1078 struct inode
*inode
;
1079 const struct cred
*cred
;
1080 nfs4_stateid stateid
;
1084 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
1085 list_for_each_entry_rcu(delegation
, &server
->delegations
,
1087 if (test_bit(NFS_DELEGATION_INODE_FREEING
,
1088 &delegation
->flags
) ||
1089 test_bit(NFS_DELEGATION_RETURNING
,
1090 &delegation
->flags
) ||
1091 test_bit(NFS_DELEGATION_TEST_EXPIRED
,
1092 &delegation
->flags
) == 0)
1094 if (!nfs_sb_active(server
->super
))
1095 break; /* continue in outer loop */
1096 inode
= nfs_delegation_grab_inode(delegation
);
1097 if (inode
== NULL
) {
1099 nfs_sb_deactive(server
->super
);
1102 cred
= get_cred_rcu(delegation
->cred
);
1103 nfs4_stateid_copy(&stateid
, &delegation
->stateid
);
1104 clear_bit(NFS_DELEGATION_TEST_EXPIRED
, &delegation
->flags
);
1106 nfs_delegation_test_free_expired(inode
, &stateid
, cred
);
1108 if (nfs4_server_rebooted(clp
)) {
1109 nfs_inode_mark_test_expired_delegation(server
,inode
);
1111 nfs_sb_deactive(server
->super
);
1115 nfs_sb_deactive(server
->super
);
1123 void nfs_inode_find_delegation_state_and_recover(struct inode
*inode
,
1124 const nfs4_stateid
*stateid
)
1126 struct nfs_client
*clp
= NFS_SERVER(inode
)->nfs_client
;
1127 struct nfs_delegation
*delegation
;
1131 delegation
= rcu_dereference(NFS_I(inode
)->delegation
);
1133 nfs4_stateid_match_other(&delegation
->stateid
, stateid
)) {
1134 nfs_mark_test_expired_delegation(NFS_SERVER(inode
), delegation
);
1139 nfs4_schedule_state_manager(clp
);
1143 * nfs_delegations_present - check for existence of delegations
1144 * @clp: client state handle
1146 * Returns one if there are any nfs_delegation structures attached
1147 * to this nfs_client.
1149 int nfs_delegations_present(struct nfs_client
*clp
)
1151 struct nfs_server
*server
;
1155 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1156 if (!list_empty(&server
->delegations
)) {
1165 * nfs4_refresh_delegation_stateid - Update delegation stateid seqid
1166 * @dst: stateid to refresh
1167 * @inode: inode to check
1169 * Returns "true" and updates "dst->seqid" * if inode had a delegation
1170 * that matches our delegation stateid. Otherwise "false" is returned.
1172 bool nfs4_refresh_delegation_stateid(nfs4_stateid
*dst
, struct inode
*inode
)
1174 struct nfs_delegation
*delegation
;
1180 delegation
= rcu_dereference(NFS_I(inode
)->delegation
);
1181 if (delegation
!= NULL
&&
1182 nfs4_stateid_match_other(dst
, &delegation
->stateid
)) {
1183 dst
->seqid
= delegation
->stateid
.seqid
;
1192 * nfs4_copy_delegation_stateid - Copy inode's state ID information
1193 * @inode: inode to check
1194 * @flags: delegation type requirement
1195 * @dst: stateid data structure to fill in
1196 * @cred: optional argument to retrieve credential
1198 * Returns "true" and fills in "dst->data" * if inode had a delegation,
1199 * otherwise "false" is returned.
1201 bool nfs4_copy_delegation_stateid(struct inode
*inode
, fmode_t flags
,
1202 nfs4_stateid
*dst
, const struct cred
**cred
)
1204 struct nfs_inode
*nfsi
= NFS_I(inode
);
1205 struct nfs_delegation
*delegation
;
1208 flags
&= FMODE_READ
|FMODE_WRITE
;
1210 delegation
= rcu_dereference(nfsi
->delegation
);
1211 ret
= nfs4_is_valid_delegation(delegation
, flags
);
1213 nfs4_stateid_copy(dst
, &delegation
->stateid
);
1214 nfs_mark_delegation_referenced(delegation
);
1216 *cred
= get_cred(delegation
->cred
);
1223 * nfs4_delegation_flush_on_close - Check if we must flush file on close
1224 * @inode: inode to check
1226 * This function checks the number of outstanding writes to the file
1227 * against the delegation 'space_limit' field to see if
1228 * the spec requires us to flush the file on close.
1230 bool nfs4_delegation_flush_on_close(const struct inode
*inode
)
1232 struct nfs_inode
*nfsi
= NFS_I(inode
);
1233 struct nfs_delegation
*delegation
;
1237 delegation
= rcu_dereference(nfsi
->delegation
);
1238 if (delegation
== NULL
|| !(delegation
->type
& FMODE_WRITE
))
1240 if (atomic_long_read(&nfsi
->nrequests
) < delegation
->pagemod_limit
)