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 /* Ensure we revalidate the attributes and page cache! */
407 spin_lock(&inode->i_lock);
408 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
409 spin_unlock(&inode->i_lock);
410 trace_nfs4_set_delegation(inode, res->delegation_type);
413 spin_unlock(&clp->cl_lock);
414 if (delegation != NULL)
415 nfs_free_delegation(delegation);
417 nfs_do_return_delegation(inode, freeme, 0);
422 * Basic procedure for returning a delegation to the server
424 static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync)
426 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
427 struct nfs_inode *nfsi = NFS_I(inode);
430 if (delegation == NULL)
433 if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
435 err = nfs_delegation_claim_opens(inode, &delegation->stateid,
437 if (!issync || err != -EAGAIN)
440 * Guard against state recovery
442 err = nfs4_wait_clnt_recover(clp);
446 nfs_abort_delegation_return(delegation, clp);
449 if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode)))
452 err = nfs_do_return_delegation(inode, delegation, issync);
457 static bool nfs_delegation_need_return(struct nfs_delegation *delegation)
461 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
463 if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags))
465 if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) {
468 spin_lock(&delegation->lock);
469 inode = delegation->inode;
470 if (inode && list_empty(&NFS_I(inode)->open_files))
472 spin_unlock(&delegation->lock);
479 * nfs_client_return_marked_delegations - return previously marked delegations
480 * @clp: nfs_client to process
482 * Note that this function is designed to be called by the state
483 * manager thread. For this reason, it cannot flush the dirty data,
484 * since that could deadlock in case of a state recovery error.
486 * Returns zero on success, or a negative errno value.
488 int nfs_client_return_marked_delegations(struct nfs_client *clp)
490 struct nfs_delegation *delegation;
491 struct nfs_server *server;
497 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
498 list_for_each_entry_rcu(delegation, &server->delegations,
500 if (!nfs_delegation_need_return(delegation))
502 if (!nfs_sb_active(server->super))
504 inode = nfs_delegation_grab_inode(delegation);
507 nfs_sb_deactive(server->super);
510 delegation = nfs_start_delegation_return_locked(NFS_I(inode));
513 err = nfs_end_delegation_return(inode, delegation, 0);
515 nfs_sb_deactive(server->super);
518 set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
527 * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens
528 * @inode: inode to process
530 * Does not protect against delegation reclaims, therefore really only safe
531 * to be called from nfs4_clear_inode().
533 void nfs_inode_return_delegation_noreclaim(struct inode *inode)
535 struct nfs_delegation *delegation;
537 delegation = nfs_inode_detach_delegation(inode);
538 if (delegation != NULL)
539 nfs_do_return_delegation(inode, delegation, 1);
543 * nfs_inode_return_delegation - synchronously return a delegation
544 * @inode: inode to process
546 * This routine will always flush any dirty data to disk on the
547 * assumption that if we need to return the delegation, then
548 * we should stop caching.
550 * Returns zero on success, or a negative errno value.
552 int nfs4_inode_return_delegation(struct inode *inode)
554 struct nfs_inode *nfsi = NFS_I(inode);
555 struct nfs_delegation *delegation;
559 delegation = nfs_start_delegation_return(nfsi);
560 if (delegation != NULL)
561 err = nfs_end_delegation_return(inode, delegation, 1);
565 static void nfs_mark_return_if_closed_delegation(struct nfs_server *server,
566 struct nfs_delegation *delegation)
568 set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags);
569 set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
572 static void nfs_mark_return_delegation(struct nfs_server *server,
573 struct nfs_delegation *delegation)
575 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
576 set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
579 static bool nfs_server_mark_return_all_delegations(struct nfs_server *server)
581 struct nfs_delegation *delegation;
584 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
585 nfs_mark_return_delegation(server, delegation);
591 static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
593 struct nfs_server *server;
596 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
597 nfs_server_mark_return_all_delegations(server);
601 static void nfs_delegation_run_state_manager(struct nfs_client *clp)
603 if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
604 nfs4_schedule_state_manager(clp);
608 * nfs_expire_all_delegations
609 * @clp: client to process
612 void nfs_expire_all_delegations(struct nfs_client *clp)
614 nfs_client_mark_return_all_delegations(clp);
615 nfs_delegation_run_state_manager(clp);
619 * nfs_super_return_all_delegations - return delegations for one superblock
623 void nfs_server_return_all_delegations(struct nfs_server *server)
625 struct nfs_client *clp = server->nfs_client;
632 need_wait = nfs_server_mark_return_all_delegations(server);
636 nfs4_schedule_state_manager(clp);
637 nfs4_wait_clnt_recover(clp);
641 static void nfs_mark_return_unused_delegation_types(struct nfs_server *server,
644 struct nfs_delegation *delegation;
646 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
647 if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE))
649 if (delegation->type & flags)
650 nfs_mark_return_if_closed_delegation(server, delegation);
654 static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp,
657 struct nfs_server *server;
660 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
661 nfs_mark_return_unused_delegation_types(server, flags);
665 static void nfs_mark_delegation_revoked(struct nfs_server *server,
666 struct nfs_delegation *delegation)
668 set_bit(NFS_DELEGATION_REVOKED, &delegation->flags);
669 delegation->stateid.type = NFS4_INVALID_STATEID_TYPE;
670 nfs_mark_return_delegation(server, delegation);
673 static bool nfs_revoke_delegation(struct inode *inode,
674 const nfs4_stateid *stateid)
676 struct nfs_delegation *delegation;
681 delegation = rcu_dereference(NFS_I(inode)->delegation);
682 if (delegation == NULL)
684 if (stateid == NULL) {
685 nfs4_stateid_copy(&tmp, &delegation->stateid);
687 } else if (!nfs4_stateid_match(stateid, &delegation->stateid))
689 nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation);
694 nfs_inode_find_state_and_recover(inode, stateid);
698 void nfs_remove_bad_delegation(struct inode *inode,
699 const nfs4_stateid *stateid)
701 struct nfs_delegation *delegation;
703 if (!nfs_revoke_delegation(inode, stateid))
705 delegation = nfs_inode_detach_delegation(inode);
707 nfs_free_delegation(delegation);
709 EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation);
712 * nfs_expire_unused_delegation_types
713 * @clp: client to process
714 * @flags: delegation types to expire
717 void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags)
719 nfs_client_mark_return_unused_delegation_types(clp, flags);
720 nfs_delegation_run_state_manager(clp);
723 static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server)
725 struct nfs_delegation *delegation;
727 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
728 if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
730 nfs_mark_return_if_closed_delegation(server, delegation);
735 * nfs_expire_unreferenced_delegations - Eliminate unused delegations
736 * @clp: nfs_client to process
739 void nfs_expire_unreferenced_delegations(struct nfs_client *clp)
741 struct nfs_server *server;
744 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
745 nfs_mark_return_unreferenced_delegations(server);
748 nfs_delegation_run_state_manager(clp);
752 * nfs_async_inode_return_delegation - asynchronously return a delegation
753 * @inode: inode to process
754 * @stateid: state ID information
756 * Returns zero on success, or a negative errno value.
758 int nfs_async_inode_return_delegation(struct inode *inode,
759 const nfs4_stateid *stateid)
761 struct nfs_server *server = NFS_SERVER(inode);
762 struct nfs_client *clp = server->nfs_client;
763 struct nfs_delegation *delegation;
766 delegation = rcu_dereference(NFS_I(inode)->delegation);
767 if (delegation == NULL)
769 if (stateid != NULL &&
770 !clp->cl_mvops->match_stateid(&delegation->stateid, stateid))
772 nfs_mark_return_delegation(server, delegation);
775 nfs_delegation_run_state_manager(clp);
782 static struct inode *
783 nfs_delegation_find_inode_server(struct nfs_server *server,
784 const struct nfs_fh *fhandle)
786 struct nfs_delegation *delegation;
787 struct inode *res = NULL;
789 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
790 spin_lock(&delegation->lock);
791 if (delegation->inode != NULL &&
792 nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
793 res = igrab(delegation->inode);
795 spin_unlock(&delegation->lock);
803 * nfs_delegation_find_inode - retrieve the inode associated with a delegation
804 * @clp: client state handle
805 * @fhandle: filehandle from a delegation recall
807 * Returns pointer to inode matching "fhandle," or NULL if a matching inode
810 struct inode *nfs_delegation_find_inode(struct nfs_client *clp,
811 const struct nfs_fh *fhandle)
813 struct nfs_server *server;
814 struct inode *res = NULL;
817 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
818 res = nfs_delegation_find_inode_server(server, fhandle);
826 static void nfs_delegation_mark_reclaim_server(struct nfs_server *server)
828 struct nfs_delegation *delegation;
830 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
832 * If the delegation may have been admin revoked, then we
835 if (test_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags))
837 set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
842 * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed
843 * @clp: nfs_client to process
846 void nfs_delegation_mark_reclaim(struct nfs_client *clp)
848 struct nfs_server *server;
851 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
852 nfs_delegation_mark_reclaim_server(server);
857 * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done
858 * @clp: nfs_client to process
861 void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
863 struct nfs_delegation *delegation;
864 struct nfs_server *server;
869 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
870 list_for_each_entry_rcu(delegation, &server->delegations,
872 if (test_bit(NFS_DELEGATION_INODE_FREEING,
873 &delegation->flags) ||
874 test_bit(NFS_DELEGATION_RETURNING,
875 &delegation->flags) ||
876 test_bit(NFS_DELEGATION_NEED_RECLAIM,
877 &delegation->flags) == 0)
879 if (!nfs_sb_active(server->super))
881 inode = nfs_delegation_grab_inode(delegation);
884 nfs_sb_deactive(server->super);
887 delegation = nfs_start_delegation_return_locked(NFS_I(inode));
889 if (delegation != NULL) {
890 delegation = nfs_detach_delegation(NFS_I(inode),
892 if (delegation != NULL)
893 nfs_free_delegation(delegation);
896 nfs_sb_deactive(server->super);
903 static inline bool nfs4_server_rebooted(const struct nfs_client *clp)
905 return (clp->cl_state & (BIT(NFS4CLNT_CHECK_LEASE) |
906 BIT(NFS4CLNT_LEASE_EXPIRED) |
907 BIT(NFS4CLNT_SESSION_RESET))) != 0;
910 static void nfs_mark_test_expired_delegation(struct nfs_server *server,
911 struct nfs_delegation *delegation)
913 if (delegation->stateid.type == NFS4_INVALID_STATEID_TYPE)
915 clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
916 set_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
917 set_bit(NFS4CLNT_DELEGATION_EXPIRED, &server->nfs_client->cl_state);
920 static void nfs_inode_mark_test_expired_delegation(struct nfs_server *server,
923 struct nfs_delegation *delegation;
926 delegation = rcu_dereference(NFS_I(inode)->delegation);
928 nfs_mark_test_expired_delegation(server, delegation);
933 static void nfs_delegation_mark_test_expired_server(struct nfs_server *server)
935 struct nfs_delegation *delegation;
937 list_for_each_entry_rcu(delegation, &server->delegations, super_list)
938 nfs_mark_test_expired_delegation(server, delegation);
942 * nfs_mark_test_expired_all_delegations - mark all delegations for testing
943 * @clp: nfs_client to process
945 * Iterates through all the delegations associated with this server and
946 * marks them as needing to be checked for validity.
948 void nfs_mark_test_expired_all_delegations(struct nfs_client *clp)
950 struct nfs_server *server;
953 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
954 nfs_delegation_mark_test_expired_server(server);
959 * nfs_reap_expired_delegations - reap expired delegations
960 * @clp: nfs_client to process
962 * Iterates through all the delegations associated with this server and
963 * checks if they have may have been revoked. This function is usually
964 * expected to be called in cases where the server may have lost its
967 void nfs_reap_expired_delegations(struct nfs_client *clp)
969 const struct nfs4_minor_version_ops *ops = clp->cl_mvops;
970 struct nfs_delegation *delegation;
971 struct nfs_server *server;
973 struct rpc_cred *cred;
974 nfs4_stateid stateid;
978 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
979 list_for_each_entry_rcu(delegation, &server->delegations,
981 if (test_bit(NFS_DELEGATION_INODE_FREEING,
982 &delegation->flags) ||
983 test_bit(NFS_DELEGATION_RETURNING,
984 &delegation->flags) ||
985 test_bit(NFS_DELEGATION_TEST_EXPIRED,
986 &delegation->flags) == 0)
988 if (!nfs_sb_active(server->super))
990 inode = nfs_delegation_grab_inode(delegation);
993 nfs_sb_deactive(server->super);
996 cred = get_rpccred_rcu(delegation->cred);
997 nfs4_stateid_copy(&stateid, &delegation->stateid);
998 clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
1001 ops->test_and_free_expired(server, &stateid, cred) < 0) {
1002 nfs_revoke_delegation(inode, &stateid);
1003 nfs_inode_find_state_and_recover(inode, &stateid);
1006 if (nfs4_server_rebooted(clp)) {
1007 nfs_inode_mark_test_expired_delegation(server,inode);
1009 nfs_sb_deactive(server->super);
1013 nfs_sb_deactive(server->super);
1020 void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
1021 const nfs4_stateid *stateid)
1023 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1024 struct nfs_delegation *delegation;
1028 delegation = rcu_dereference(NFS_I(inode)->delegation);
1030 nfs4_stateid_match_other(&delegation->stateid, stateid)) {
1031 nfs_mark_test_expired_delegation(NFS_SERVER(inode), delegation);
1036 nfs4_schedule_state_manager(clp);
1040 * nfs_delegations_present - check for existence of delegations
1041 * @clp: client state handle
1043 * Returns one if there are any nfs_delegation structures attached
1044 * to this nfs_client.
1046 int nfs_delegations_present(struct nfs_client *clp)
1048 struct nfs_server *server;
1052 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1053 if (!list_empty(&server->delegations)) {
1062 * nfs4_copy_delegation_stateid - Copy inode's state ID information
1063 * @inode: inode to check
1064 * @flags: delegation type requirement
1065 * @dst: stateid data structure to fill in
1066 * @cred: optional argument to retrieve credential
1068 * Returns "true" and fills in "dst->data" * if inode had a delegation,
1069 * otherwise "false" is returned.
1071 bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags,
1072 nfs4_stateid *dst, struct rpc_cred **cred)
1074 struct nfs_inode *nfsi = NFS_I(inode);
1075 struct nfs_delegation *delegation;
1078 flags &= FMODE_READ|FMODE_WRITE;
1080 delegation = rcu_dereference(nfsi->delegation);
1081 ret = nfs4_is_valid_delegation(delegation, flags);
1083 nfs4_stateid_copy(dst, &delegation->stateid);
1084 nfs_mark_delegation_referenced(delegation);
1086 *cred = get_rpccred(delegation->cred);
1093 * nfs4_delegation_flush_on_close - Check if we must flush file on close
1094 * @inode: inode to check
1096 * This function checks the number of outstanding writes to the file
1097 * against the delegation 'space_limit' field to see if
1098 * the spec requires us to flush the file on close.
1100 bool nfs4_delegation_flush_on_close(const struct inode *inode)
1102 struct nfs_inode *nfsi = NFS_I(inode);
1103 struct nfs_delegation *delegation;
1107 delegation = rcu_dereference(nfsi->delegation);
1108 if (delegation == NULL || !(delegation->type & FMODE_WRITE))
1110 if (nfsi->nrequests < delegation->pagemod_limit)