2 * linux/fs/nfs/delegation.c
4 * Copyright (C) 2004 Trond Myklebust
6 * NFS file delegation management
9 #include <linux/completion.h>
10 #include <linux/kthread.h>
11 #include <linux/module.h>
12 #include <linux/sched.h>
13 #include <linux/slab.h>
14 #include <linux/spinlock.h>
16 #include <linux/nfs4.h>
17 #include <linux/nfs_fs.h>
18 #include <linux/nfs_xdr.h>
21 #include "delegation.h"
23 #include "nfs4trace.h"
25 static void nfs_free_delegation(struct nfs_delegation *delegation)
27 if (delegation->cred) {
28 put_rpccred(delegation->cred);
29 delegation->cred = NULL;
31 kfree_rcu(delegation, rcu);
35 * nfs_mark_delegation_referenced - set delegation's REFERENCED flag
36 * @delegation: delegation to process
39 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation)
41 set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags);
45 nfs4_is_valid_delegation(const struct nfs_delegation *delegation,
48 if (delegation != NULL && (delegation->type & flags) == flags &&
49 !test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) &&
50 !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
55 struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode)
57 struct nfs_delegation *delegation;
59 delegation = rcu_dereference(NFS_I(inode)->delegation);
60 if (nfs4_is_valid_delegation(delegation, 0))
66 nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark)
68 struct nfs_delegation *delegation;
71 flags &= FMODE_READ|FMODE_WRITE;
73 delegation = rcu_dereference(NFS_I(inode)->delegation);
74 if (nfs4_is_valid_delegation(delegation, flags)) {
76 nfs_mark_delegation_referenced(delegation);
83 * nfs_have_delegation - check if inode has a delegation, mark it
84 * NFS_DELEGATION_REFERENCED if there is one.
85 * @inode: inode to check
86 * @flags: delegation types to check for
88 * Returns one if inode has the indicated delegation, otherwise zero.
90 int nfs4_have_delegation(struct inode *inode, fmode_t flags)
92 return nfs4_do_check_delegation(inode, flags, true);
96 * nfs4_check_delegation - check if inode has a delegation, do not mark
97 * NFS_DELEGATION_REFERENCED if it has one.
99 int nfs4_check_delegation(struct inode *inode, fmode_t flags)
101 return nfs4_do_check_delegation(inode, flags, false);
104 static int nfs_delegation_claim_locks(struct nfs4_state *state, const nfs4_stateid *stateid)
106 struct inode *inode = state->inode;
107 struct file_lock *fl;
108 struct file_lock_context *flctx = inode->i_flctx;
109 struct list_head *list;
115 list = &flctx->flc_posix;
116 spin_lock(&flctx->flc_lock);
118 list_for_each_entry(fl, list, fl_list) {
119 if (nfs_file_open_context(fl->fl_file)->state != state)
121 spin_unlock(&flctx->flc_lock);
122 status = nfs4_lock_delegation_recall(fl, state, stateid);
125 spin_lock(&flctx->flc_lock);
127 if (list == &flctx->flc_posix) {
128 list = &flctx->flc_flock;
131 spin_unlock(&flctx->flc_lock);
136 static int nfs_delegation_claim_opens(struct inode *inode,
137 const nfs4_stateid *stateid, fmode_t type)
139 struct nfs_inode *nfsi = NFS_I(inode);
140 struct nfs_open_context *ctx;
141 struct nfs4_state_owner *sp;
142 struct nfs4_state *state;
147 spin_lock(&inode->i_lock);
148 list_for_each_entry(ctx, &nfsi->open_files, list) {
152 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
154 if (!nfs4_valid_open_stateid(state))
156 if (!nfs4_stateid_match(&state->stateid, stateid))
158 get_nfs_open_context(ctx);
159 spin_unlock(&inode->i_lock);
161 /* Block nfs4_proc_unlck */
162 mutex_lock(&sp->so_delegreturn_mutex);
163 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
164 err = nfs4_open_delegation_recall(ctx, state, stateid, type);
166 err = nfs_delegation_claim_locks(state, stateid);
167 if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
169 mutex_unlock(&sp->so_delegreturn_mutex);
170 put_nfs_open_context(ctx);
175 spin_unlock(&inode->i_lock);
180 * nfs_inode_reclaim_delegation - process a delegation reclaim request
181 * @inode: inode to process
182 * @cred: credential to use for request
183 * @res: new delegation state from server
186 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
187 struct nfs_openres *res)
189 struct nfs_delegation *delegation;
190 struct rpc_cred *oldcred = NULL;
193 delegation = rcu_dereference(NFS_I(inode)->delegation);
194 if (delegation != NULL) {
195 spin_lock(&delegation->lock);
196 if (delegation->inode != NULL) {
197 nfs4_stateid_copy(&delegation->stateid, &res->delegation);
198 delegation->type = res->delegation_type;
199 delegation->pagemod_limit = res->pagemod_limit;
200 oldcred = delegation->cred;
201 delegation->cred = get_rpccred(cred);
202 clear_bit(NFS_DELEGATION_NEED_RECLAIM,
204 spin_unlock(&delegation->lock);
206 put_rpccred(oldcred);
207 trace_nfs4_reclaim_delegation(inode, res->delegation_type);
210 /* We appear to have raced with a delegation return. */
211 spin_unlock(&delegation->lock);
214 nfs_inode_set_delegation(inode, cred, res);
217 static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)
221 if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
222 res = nfs4_proc_delegreturn(inode,
224 &delegation->stateid,
226 nfs_free_delegation(delegation);
230 static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation)
232 struct inode *inode = NULL;
234 spin_lock(&delegation->lock);
235 if (delegation->inode != NULL)
236 inode = igrab(delegation->inode);
238 set_bit(NFS_DELEGATION_INODE_FREEING, &delegation->flags);
239 spin_unlock(&delegation->lock);
243 static struct nfs_delegation *
244 nfs_start_delegation_return_locked(struct nfs_inode *nfsi)
246 struct nfs_delegation *ret = NULL;
247 struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation);
249 if (delegation == NULL)
251 spin_lock(&delegation->lock);
252 if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
254 spin_unlock(&delegation->lock);
259 static struct nfs_delegation *
260 nfs_start_delegation_return(struct nfs_inode *nfsi)
262 struct nfs_delegation *delegation;
265 delegation = nfs_start_delegation_return_locked(nfsi);
271 nfs_abort_delegation_return(struct nfs_delegation *delegation,
272 struct nfs_client *clp)
275 spin_lock(&delegation->lock);
276 clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags);
277 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
278 spin_unlock(&delegation->lock);
279 set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
282 static struct nfs_delegation *
283 nfs_detach_delegation_locked(struct nfs_inode *nfsi,
284 struct nfs_delegation *delegation,
285 struct nfs_client *clp)
287 struct nfs_delegation *deleg_cur =
288 rcu_dereference_protected(nfsi->delegation,
289 lockdep_is_held(&clp->cl_lock));
291 if (deleg_cur == NULL || delegation != deleg_cur)
294 spin_lock(&delegation->lock);
295 set_bit(NFS_DELEGATION_RETURNING, &delegation->flags);
296 list_del_rcu(&delegation->super_list);
297 delegation->inode = NULL;
298 rcu_assign_pointer(nfsi->delegation, NULL);
299 spin_unlock(&delegation->lock);
303 static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi,
304 struct nfs_delegation *delegation,
305 struct nfs_server *server)
307 struct nfs_client *clp = server->nfs_client;
309 spin_lock(&clp->cl_lock);
310 delegation = nfs_detach_delegation_locked(nfsi, delegation, clp);
311 spin_unlock(&clp->cl_lock);
315 static struct nfs_delegation *
316 nfs_inode_detach_delegation(struct inode *inode)
318 struct nfs_inode *nfsi = NFS_I(inode);
319 struct nfs_server *server = NFS_SERVER(inode);
320 struct nfs_delegation *delegation;
322 delegation = nfs_start_delegation_return(nfsi);
323 if (delegation == NULL)
325 return nfs_detach_delegation(nfsi, delegation, server);
329 nfs_update_inplace_delegation(struct nfs_delegation *delegation,
330 const struct nfs_delegation *update)
332 if (nfs4_stateid_is_newer(&update->stateid, &delegation->stateid)) {
333 delegation->stateid.seqid = update->stateid.seqid;
335 delegation->type = update->type;
340 * nfs_inode_set_delegation - set up a delegation on an inode
341 * @inode: inode to which delegation applies
342 * @cred: cred to use for subsequent delegation processing
343 * @res: new delegation state from server
345 * Returns zero on success, or a negative errno value.
347 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
349 struct nfs_server *server = NFS_SERVER(inode);
350 struct nfs_client *clp = server->nfs_client;
351 struct nfs_inode *nfsi = NFS_I(inode);
352 struct nfs_delegation *delegation, *old_delegation;
353 struct nfs_delegation *freeme = NULL;
356 delegation = kmalloc(sizeof(*delegation), GFP_NOFS);
357 if (delegation == NULL)
359 nfs4_stateid_copy(&delegation->stateid, &res->delegation);
360 delegation->type = res->delegation_type;
361 delegation->pagemod_limit = res->pagemod_limit;
362 delegation->change_attr = inode->i_version;
363 delegation->cred = get_rpccred(cred);
364 delegation->inode = inode;
365 delegation->flags = 1<<NFS_DELEGATION_REFERENCED;
366 spin_lock_init(&delegation->lock);
368 spin_lock(&clp->cl_lock);
369 old_delegation = rcu_dereference_protected(nfsi->delegation,
370 lockdep_is_held(&clp->cl_lock));
371 if (old_delegation != NULL) {
372 /* Is this an update of the existing delegation? */
373 if (nfs4_stateid_match_other(&old_delegation->stateid,
374 &delegation->stateid)) {
375 nfs_update_inplace_delegation(old_delegation,
380 * Deal with broken servers that hand out two
381 * delegations for the same file.
382 * Allow for upgrades to a WRITE delegation, but
385 dfprintk(FILE, "%s: server %s handed out "
386 "a duplicate delegation!\n",
387 __func__, clp->cl_hostname);
388 if (delegation->type == old_delegation->type ||
389 !(delegation->type & FMODE_WRITE)) {
394 if (test_and_set_bit(NFS_DELEGATION_RETURNING,
395 &old_delegation->flags))
397 freeme = nfs_detach_delegation_locked(nfsi,
398 old_delegation, clp);
402 list_add_tail_rcu(&delegation->super_list, &server->delegations);
403 rcu_assign_pointer(nfsi->delegation, delegation);
406 trace_nfs4_set_delegation(inode, res->delegation_type);
409 spin_unlock(&clp->cl_lock);
410 if (delegation != NULL)
411 nfs_free_delegation(delegation);
413 nfs_do_return_delegation(inode, freeme, 0);
418 * Basic procedure for returning a delegation to the server
420 static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync)
422 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
423 struct nfs_inode *nfsi = NFS_I(inode);
426 if (delegation == NULL)
429 if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
431 err = nfs_delegation_claim_opens(inode, &delegation->stateid,
433 if (!issync || err != -EAGAIN)
436 * Guard against state recovery
438 err = nfs4_wait_clnt_recover(clp);
442 nfs_abort_delegation_return(delegation, clp);
445 if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode)))
448 err = nfs_do_return_delegation(inode, delegation, issync);
453 static bool nfs_delegation_need_return(struct nfs_delegation *delegation)
457 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
459 if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags))
461 if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) {
464 spin_lock(&delegation->lock);
465 inode = delegation->inode;
466 if (inode && list_empty(&NFS_I(inode)->open_files))
468 spin_unlock(&delegation->lock);
475 * nfs_client_return_marked_delegations - return previously marked delegations
476 * @clp: nfs_client to process
478 * Note that this function is designed to be called by the state
479 * manager thread. For this reason, it cannot flush the dirty data,
480 * since that could deadlock in case of a state recovery error.
482 * Returns zero on success, or a negative errno value.
484 int nfs_client_return_marked_delegations(struct nfs_client *clp)
486 struct nfs_delegation *delegation;
487 struct nfs_server *server;
493 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
494 list_for_each_entry_rcu(delegation, &server->delegations,
496 if (!nfs_delegation_need_return(delegation))
498 if (!nfs_sb_active(server->super))
500 inode = nfs_delegation_grab_inode(delegation);
503 nfs_sb_deactive(server->super);
506 delegation = nfs_start_delegation_return_locked(NFS_I(inode));
509 err = nfs_end_delegation_return(inode, delegation, 0);
511 nfs_sb_deactive(server->super);
514 set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
523 * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens
524 * @inode: inode to process
526 * Does not protect against delegation reclaims, therefore really only safe
527 * to be called from nfs4_clear_inode().
529 void nfs_inode_return_delegation_noreclaim(struct inode *inode)
531 struct nfs_delegation *delegation;
533 delegation = nfs_inode_detach_delegation(inode);
534 if (delegation != NULL)
535 nfs_do_return_delegation(inode, delegation, 1);
539 * nfs_inode_return_delegation - synchronously return a delegation
540 * @inode: inode to process
542 * This routine will always flush any dirty data to disk on the
543 * assumption that if we need to return the delegation, then
544 * we should stop caching.
546 * Returns zero on success, or a negative errno value.
548 int nfs4_inode_return_delegation(struct inode *inode)
550 struct nfs_inode *nfsi = NFS_I(inode);
551 struct nfs_delegation *delegation;
555 delegation = nfs_start_delegation_return(nfsi);
556 if (delegation != NULL)
557 err = nfs_end_delegation_return(inode, delegation, 1);
561 static void nfs_mark_return_if_closed_delegation(struct nfs_server *server,
562 struct nfs_delegation *delegation)
564 set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags);
565 set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
568 static void nfs_mark_return_delegation(struct nfs_server *server,
569 struct nfs_delegation *delegation)
571 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
572 set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
575 static bool nfs_server_mark_return_all_delegations(struct nfs_server *server)
577 struct nfs_delegation *delegation;
580 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
581 nfs_mark_return_delegation(server, delegation);
587 static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
589 struct nfs_server *server;
592 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
593 nfs_server_mark_return_all_delegations(server);
597 static void nfs_delegation_run_state_manager(struct nfs_client *clp)
599 if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
600 nfs4_schedule_state_manager(clp);
604 * nfs_expire_all_delegations
605 * @clp: client to process
608 void nfs_expire_all_delegations(struct nfs_client *clp)
610 nfs_client_mark_return_all_delegations(clp);
611 nfs_delegation_run_state_manager(clp);
615 * nfs_super_return_all_delegations - return delegations for one superblock
619 void nfs_server_return_all_delegations(struct nfs_server *server)
621 struct nfs_client *clp = server->nfs_client;
628 need_wait = nfs_server_mark_return_all_delegations(server);
632 nfs4_schedule_state_manager(clp);
633 nfs4_wait_clnt_recover(clp);
637 static void nfs_mark_return_unused_delegation_types(struct nfs_server *server,
640 struct nfs_delegation *delegation;
642 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
643 if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE))
645 if (delegation->type & flags)
646 nfs_mark_return_if_closed_delegation(server, delegation);
650 static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp,
653 struct nfs_server *server;
656 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
657 nfs_mark_return_unused_delegation_types(server, flags);
661 static void nfs_mark_delegation_revoked(struct nfs_server *server,
662 struct nfs_delegation *delegation)
664 set_bit(NFS_DELEGATION_REVOKED, &delegation->flags);
665 delegation->stateid.type = NFS4_INVALID_STATEID_TYPE;
666 nfs_mark_return_delegation(server, delegation);
669 static bool nfs_revoke_delegation(struct inode *inode,
670 const nfs4_stateid *stateid)
672 struct nfs_delegation *delegation;
677 delegation = rcu_dereference(NFS_I(inode)->delegation);
678 if (delegation == NULL)
680 if (stateid == NULL) {
681 nfs4_stateid_copy(&tmp, &delegation->stateid);
683 } else if (!nfs4_stateid_match(stateid, &delegation->stateid))
685 nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation);
690 nfs_inode_find_state_and_recover(inode, stateid);
694 void nfs_remove_bad_delegation(struct inode *inode,
695 const nfs4_stateid *stateid)
697 struct nfs_delegation *delegation;
699 if (!nfs_revoke_delegation(inode, stateid))
701 delegation = nfs_inode_detach_delegation(inode);
703 nfs_free_delegation(delegation);
705 EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation);
708 * nfs_expire_unused_delegation_types
709 * @clp: client to process
710 * @flags: delegation types to expire
713 void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags)
715 nfs_client_mark_return_unused_delegation_types(clp, flags);
716 nfs_delegation_run_state_manager(clp);
719 static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server)
721 struct nfs_delegation *delegation;
723 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
724 if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
726 nfs_mark_return_if_closed_delegation(server, delegation);
731 * nfs_expire_unreferenced_delegations - Eliminate unused delegations
732 * @clp: nfs_client to process
735 void nfs_expire_unreferenced_delegations(struct nfs_client *clp)
737 struct nfs_server *server;
740 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
741 nfs_mark_return_unreferenced_delegations(server);
744 nfs_delegation_run_state_manager(clp);
748 * nfs_async_inode_return_delegation - asynchronously return a delegation
749 * @inode: inode to process
750 * @stateid: state ID information
752 * Returns zero on success, or a negative errno value.
754 int nfs_async_inode_return_delegation(struct inode *inode,
755 const nfs4_stateid *stateid)
757 struct nfs_server *server = NFS_SERVER(inode);
758 struct nfs_client *clp = server->nfs_client;
759 struct nfs_delegation *delegation;
762 delegation = rcu_dereference(NFS_I(inode)->delegation);
763 if (delegation == NULL)
765 if (stateid != NULL &&
766 !clp->cl_mvops->match_stateid(&delegation->stateid, stateid))
768 nfs_mark_return_delegation(server, delegation);
771 nfs_delegation_run_state_manager(clp);
778 static struct inode *
779 nfs_delegation_find_inode_server(struct nfs_server *server,
780 const struct nfs_fh *fhandle)
782 struct nfs_delegation *delegation;
783 struct inode *res = NULL;
785 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
786 spin_lock(&delegation->lock);
787 if (delegation->inode != NULL &&
788 nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
789 res = igrab(delegation->inode);
791 spin_unlock(&delegation->lock);
799 * nfs_delegation_find_inode - retrieve the inode associated with a delegation
800 * @clp: client state handle
801 * @fhandle: filehandle from a delegation recall
803 * Returns pointer to inode matching "fhandle," or NULL if a matching inode
806 struct inode *nfs_delegation_find_inode(struct nfs_client *clp,
807 const struct nfs_fh *fhandle)
809 struct nfs_server *server;
810 struct inode *res = NULL;
813 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
814 res = nfs_delegation_find_inode_server(server, fhandle);
822 static void nfs_delegation_mark_reclaim_server(struct nfs_server *server)
824 struct nfs_delegation *delegation;
826 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
828 * If the delegation may have been admin revoked, then we
831 if (test_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags))
833 set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
838 * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed
839 * @clp: nfs_client to process
842 void nfs_delegation_mark_reclaim(struct nfs_client *clp)
844 struct nfs_server *server;
847 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
848 nfs_delegation_mark_reclaim_server(server);
853 * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done
854 * @clp: nfs_client to process
857 void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
859 struct nfs_delegation *delegation;
860 struct nfs_server *server;
865 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
866 list_for_each_entry_rcu(delegation, &server->delegations,
868 if (test_bit(NFS_DELEGATION_INODE_FREEING,
869 &delegation->flags) ||
870 test_bit(NFS_DELEGATION_RETURNING,
871 &delegation->flags) ||
872 test_bit(NFS_DELEGATION_NEED_RECLAIM,
873 &delegation->flags) == 0)
875 if (!nfs_sb_active(server->super))
877 inode = nfs_delegation_grab_inode(delegation);
880 nfs_sb_deactive(server->super);
883 delegation = nfs_start_delegation_return_locked(NFS_I(inode));
885 if (delegation != NULL) {
886 delegation = nfs_detach_delegation(NFS_I(inode),
888 if (delegation != NULL)
889 nfs_free_delegation(delegation);
892 nfs_sb_deactive(server->super);
899 static inline bool nfs4_server_rebooted(const struct nfs_client *clp)
901 return (clp->cl_state & (BIT(NFS4CLNT_CHECK_LEASE) |
902 BIT(NFS4CLNT_LEASE_EXPIRED) |
903 BIT(NFS4CLNT_SESSION_RESET))) != 0;
906 static void nfs_mark_test_expired_delegation(struct nfs_server *server,
907 struct nfs_delegation *delegation)
909 if (delegation->stateid.type == NFS4_INVALID_STATEID_TYPE)
911 clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
912 set_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
913 set_bit(NFS4CLNT_DELEGATION_EXPIRED, &server->nfs_client->cl_state);
916 static void nfs_inode_mark_test_expired_delegation(struct nfs_server *server,
919 struct nfs_delegation *delegation;
922 delegation = rcu_dereference(NFS_I(inode)->delegation);
924 nfs_mark_test_expired_delegation(server, delegation);
929 static void nfs_delegation_mark_test_expired_server(struct nfs_server *server)
931 struct nfs_delegation *delegation;
933 list_for_each_entry_rcu(delegation, &server->delegations, super_list)
934 nfs_mark_test_expired_delegation(server, delegation);
938 * nfs_mark_test_expired_all_delegations - mark all delegations for testing
939 * @clp: nfs_client to process
941 * Iterates through all the delegations associated with this server and
942 * marks them as needing to be checked for validity.
944 void nfs_mark_test_expired_all_delegations(struct nfs_client *clp)
946 struct nfs_server *server;
949 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
950 nfs_delegation_mark_test_expired_server(server);
955 * nfs_reap_expired_delegations - reap expired delegations
956 * @clp: nfs_client to process
958 * Iterates through all the delegations associated with this server and
959 * checks if they have may have been revoked. This function is usually
960 * expected to be called in cases where the server may have lost its
963 void nfs_reap_expired_delegations(struct nfs_client *clp)
965 const struct nfs4_minor_version_ops *ops = clp->cl_mvops;
966 struct nfs_delegation *delegation;
967 struct nfs_server *server;
969 struct rpc_cred *cred;
970 nfs4_stateid stateid;
974 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
975 list_for_each_entry_rcu(delegation, &server->delegations,
977 if (test_bit(NFS_DELEGATION_INODE_FREEING,
978 &delegation->flags) ||
979 test_bit(NFS_DELEGATION_RETURNING,
980 &delegation->flags) ||
981 test_bit(NFS_DELEGATION_TEST_EXPIRED,
982 &delegation->flags) == 0)
984 if (!nfs_sb_active(server->super))
986 inode = nfs_delegation_grab_inode(delegation);
989 nfs_sb_deactive(server->super);
992 cred = get_rpccred_rcu(delegation->cred);
993 nfs4_stateid_copy(&stateid, &delegation->stateid);
994 clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
997 ops->test_and_free_expired(server, &stateid, cred) < 0) {
998 nfs_revoke_delegation(inode, &stateid);
999 nfs_inode_find_state_and_recover(inode, &stateid);
1002 if (nfs4_server_rebooted(clp)) {
1003 nfs_inode_mark_test_expired_delegation(server,inode);
1005 nfs_sb_deactive(server->super);
1009 nfs_sb_deactive(server->super);
1016 void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
1017 const nfs4_stateid *stateid)
1019 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1020 struct nfs_delegation *delegation;
1024 delegation = rcu_dereference(NFS_I(inode)->delegation);
1026 nfs4_stateid_match_other(&delegation->stateid, stateid)) {
1027 nfs_mark_test_expired_delegation(NFS_SERVER(inode), delegation);
1032 nfs4_schedule_state_manager(clp);
1036 * nfs_delegations_present - check for existence of delegations
1037 * @clp: client state handle
1039 * Returns one if there are any nfs_delegation structures attached
1040 * to this nfs_client.
1042 int nfs_delegations_present(struct nfs_client *clp)
1044 struct nfs_server *server;
1048 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1049 if (!list_empty(&server->delegations)) {
1058 * nfs4_copy_delegation_stateid - Copy inode's state ID information
1059 * @inode: inode to check
1060 * @flags: delegation type requirement
1061 * @dst: stateid data structure to fill in
1062 * @cred: optional argument to retrieve credential
1064 * Returns "true" and fills in "dst->data" * if inode had a delegation,
1065 * otherwise "false" is returned.
1067 bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags,
1068 nfs4_stateid *dst, struct rpc_cred **cred)
1070 struct nfs_inode *nfsi = NFS_I(inode);
1071 struct nfs_delegation *delegation;
1074 flags &= FMODE_READ|FMODE_WRITE;
1076 delegation = rcu_dereference(nfsi->delegation);
1077 ret = nfs4_is_valid_delegation(delegation, flags);
1079 nfs4_stateid_copy(dst, &delegation->stateid);
1080 nfs_mark_delegation_referenced(delegation);
1082 *cred = get_rpccred(delegation->cred);
1089 * nfs4_delegation_flush_on_close - Check if we must flush file on close
1090 * @inode: inode to check
1092 * This function checks the number of outstanding writes to the file
1093 * against the delegation 'space_limit' field to see if
1094 * the spec requires us to flush the file on close.
1096 bool nfs4_delegation_flush_on_close(const struct inode *inode)
1098 struct nfs_inode *nfsi = NFS_I(inode);
1099 struct nfs_delegation *delegation;
1103 delegation = rcu_dereference(nfsi->delegation);
1104 if (delegation == NULL || !(delegation->type & FMODE_WRITE))
1106 if (atomic_long_read(&nfsi->nrequests) < delegation->pagemod_limit)