1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Copyright (C) 2004 Oracle. All rights reserved.
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public
19 * License along with this program; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 021110-1307, USA.
28 #include <linux/kref.h>
30 #define DLM_HB_NODE_DOWN_PRI (0xf000000)
31 #define DLM_HB_NODE_UP_PRI (0x8000000)
33 #define DLM_LOCKID_NAME_MAX 32
35 #define DLM_DOMAIN_NAME_MAX_LEN 255
36 #define DLM_LOCK_RES_OWNER_UNKNOWN O2NM_MAX_NODES
37 #define DLM_THREAD_SHUFFLE_INTERVAL 5 // flush everything every 5 passes
38 #define DLM_THREAD_MS 200 // flush at least every 200 ms
40 #define DLM_HASH_BITS 7
41 #define DLM_HASH_SIZE (1 << DLM_HASH_BITS)
42 #define DLM_HASH_MASK (DLM_HASH_SIZE - 1)
51 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
52 LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
53 LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
55 #define DLM_RECOVERY_LOCK_NAME "$RECOVERY"
56 #define DLM_RECOVERY_LOCK_NAME_LEN 9
58 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
60 if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
61 memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
66 #define DLM_RECO_STATE_ACTIVE 0x0001
68 struct dlm_recovery_ctxt
70 struct list_head resources;
71 struct list_head received;
72 struct list_head node_data;
76 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
77 wait_queue_head_t event;
89 struct list_head list;
90 struct list_head *resources;
91 struct list_head dirty_list;
92 struct list_head purge_list;
93 struct list_head pending_asts;
94 struct list_head pending_basts;
95 unsigned int purge_count;
102 wait_queue_head_t dlm_join_events;
103 unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
104 unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
105 unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
106 struct dlm_recovery_ctxt reco;
107 spinlock_t master_lock;
108 struct list_head master_list;
109 struct list_head mle_hb_events;
111 /* these give a really vague idea of the system load */
112 atomic_t local_resources;
113 atomic_t remote_resources;
114 atomic_t unknown_resources;
116 /* NOTE: Next three are protected by dlm_domain_lock */
117 struct kref dlm_refs;
118 enum dlm_ctxt_state dlm_state;
119 unsigned int num_joins;
121 struct o2hb_callback_func dlm_hb_up;
122 struct o2hb_callback_func dlm_hb_down;
123 struct task_struct *dlm_thread_task;
124 struct task_struct *dlm_reco_thread_task;
125 wait_queue_head_t dlm_thread_wq;
126 wait_queue_head_t dlm_reco_thread_wq;
127 wait_queue_head_t ast_wq;
128 wait_queue_head_t migration_wq;
130 struct work_struct dispatched_work;
131 struct list_head work_list;
132 spinlock_t work_lock;
133 struct list_head dlm_domain_handlers;
134 struct list_head dlm_eviction_callbacks;
137 /* these keventd work queue items are for less-frequently
138 * called functions that cannot be directly called from the
139 * net message handlers for some reason, usually because
140 * they need to send net messages of their own. */
141 void dlm_dispatch_work(void *data);
143 struct dlm_lock_resource;
144 struct dlm_work_item;
146 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
148 struct dlm_request_all_locks_priv
154 struct dlm_mig_lockres_priv
156 struct dlm_lock_resource *lockres;
160 struct dlm_assert_master_priv
162 struct dlm_lock_resource *lockres;
165 unsigned ignore_higher:1;
171 struct list_head list;
172 dlm_workfunc_t *func;
173 struct dlm_ctxt *dlm;
176 struct dlm_request_all_locks_priv ral;
177 struct dlm_mig_lockres_priv ml;
178 struct dlm_assert_master_priv am;
182 static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
183 struct dlm_work_item *i,
184 dlm_workfunc_t *f, void *data)
186 memset(i, 0, sizeof(*i));
188 INIT_LIST_HEAD(&i->list);
190 i->dlm = dlm; /* must have already done a dlm_grab on this! */
195 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
198 assert_spin_locked(&dlm->spinlock);
200 dlm->joining_node = node;
201 wake_up(&dlm->dlm_join_events);
204 #define DLM_LOCK_RES_UNINITED 0x00000001
205 #define DLM_LOCK_RES_RECOVERING 0x00000002
206 #define DLM_LOCK_RES_READY 0x00000004
207 #define DLM_LOCK_RES_DIRTY 0x00000008
208 #define DLM_LOCK_RES_IN_PROGRESS 0x00000010
209 #define DLM_LOCK_RES_MIGRATING 0x00000020
211 /* max milliseconds to wait to sync up a network failure with a node death */
212 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
214 #define DLM_PURGE_INTERVAL_MS (8 * 1000)
216 struct dlm_lock_resource
218 /* WARNING: Please see the comment in dlm_init_lockres before
219 * adding fields here. */
220 struct list_head list;
223 /* please keep these next 3 in this order
224 * some funcs want to iterate over all lists */
225 struct list_head granted;
226 struct list_head converting;
227 struct list_head blocked;
229 struct list_head dirty;
230 struct list_head recovering; // dlm_recovery_ctxt.resources list
232 /* unused lock resources have their last_used stamped and are
233 * put on a list for the dlm thread to run. */
234 struct list_head purge;
235 unsigned long last_used;
237 unsigned migration_pending:1;
238 atomic_t asts_reserved;
240 wait_queue_head_t wq;
241 u8 owner; //node which owns the lock resource, or unknown
243 struct qstr lockname;
244 char lvb[DLM_LVB_LEN];
247 struct dlm_migratable_lock
251 /* these 3 are just padding for the in-memory structure, but
252 * list and flags are actually used when sent over the wire */
254 u8 list; // 0=granted, 1=converting, 2=blocked
265 struct dlm_migratable_lock ml;
267 struct list_head list;
268 struct list_head ast_list;
269 struct list_head bast_list;
270 struct dlm_lock_resource *lockres;
272 struct kref lock_refs;
274 // ast and bast must be callable while holding a spinlock!
275 dlm_astlockfunc_t *ast;
276 dlm_bastlockfunc_t *bast;
278 struct dlm_lockstatus *lksb;
279 unsigned ast_pending:1,
285 lksb_kernel_allocated:1;
289 #define DLM_LKSB_UNUSED1 0x01
290 #define DLM_LKSB_PUT_LVB 0x02
291 #define DLM_LKSB_GET_LVB 0x04
292 #define DLM_LKSB_UNUSED2 0x08
293 #define DLM_LKSB_UNUSED3 0x10
294 #define DLM_LKSB_UNUSED4 0x20
295 #define DLM_LKSB_UNUSED5 0x40
296 #define DLM_LKSB_UNUSED6 0x80
299 enum dlm_lockres_list {
300 DLM_GRANTED_LIST = 0,
305 static inline struct list_head *
306 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
308 struct list_head *ret = NULL;
309 if (idx == DLM_GRANTED_LIST)
311 else if (idx == DLM_CONVERTING_LIST)
312 ret = &res->converting;
313 else if (idx == DLM_BLOCKED_LIST)
325 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
331 DLM_MASTER_REQUEST_MSG = 500,
332 DLM_UNUSED_MSG1, /* 501 */
333 DLM_ASSERT_MASTER_MSG, /* 502 */
334 DLM_CREATE_LOCK_MSG, /* 503 */
335 DLM_CONVERT_LOCK_MSG, /* 504 */
336 DLM_PROXY_AST_MSG, /* 505 */
337 DLM_UNLOCK_LOCK_MSG, /* 506 */
338 DLM_UNUSED_MSG2, /* 507 */
339 DLM_MIGRATE_REQUEST_MSG, /* 508 */
340 DLM_MIG_LOCKRES_MSG, /* 509 */
341 DLM_QUERY_JOIN_MSG, /* 510 */
342 DLM_ASSERT_JOINED_MSG, /* 511 */
343 DLM_CANCEL_JOIN_MSG, /* 512 */
344 DLM_EXIT_DOMAIN_MSG, /* 513 */
345 DLM_MASTER_REQUERY_MSG, /* 514 */
346 DLM_LOCK_REQUEST_MSG, /* 515 */
347 DLM_RECO_DATA_DONE_MSG, /* 516 */
348 DLM_BEGIN_RECO_MSG, /* 517 */
349 DLM_FINALIZE_RECO_MSG /* 518 */
352 struct dlm_reco_node_data
356 struct list_head list;
360 DLM_RECO_NODE_DATA_DEAD = -1,
361 DLM_RECO_NODE_DATA_INIT = 0,
362 DLM_RECO_NODE_DATA_REQUESTING,
363 DLM_RECO_NODE_DATA_REQUESTED,
364 DLM_RECO_NODE_DATA_RECEIVING,
365 DLM_RECO_NODE_DATA_DONE,
366 DLM_RECO_NODE_DATA_FINALIZE_SENT,
371 DLM_MASTER_RESP_NO = 0,
373 DLM_MASTER_RESP_MAYBE,
374 DLM_MASTER_RESP_ERROR
378 struct dlm_master_request
385 u8 name[O2NM_MAX_NAME_LEN];
388 #define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
389 #define DLM_ASSERT_MASTER_REQUERY 0x00000002
390 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
391 struct dlm_assert_master
398 u8 name[O2NM_MAX_NAME_LEN];
401 struct dlm_migrate_request
408 u8 name[O2NM_MAX_NAME_LEN];
411 struct dlm_master_requery
418 u8 name[O2NM_MAX_NAME_LEN];
421 #define DLM_MRES_RECOVERY 0x01
422 #define DLM_MRES_MIGRATION 0x02
423 #define DLM_MRES_ALL_DONE 0x04
426 * We would like to get one whole lockres into a single network
427 * message whenever possible. Generally speaking, there will be
428 * at most one dlm_lock on a lockres for each node in the cluster,
429 * plus (infrequently) any additional locks coming in from userdlm.
431 * struct _dlm_lockres_page
433 * dlm_migratable_lockres mres;
434 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
435 * u8 pad[DLM_MIG_LOCKRES_RESERVED];
438 * from ../cluster/tcp.h
439 * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
440 * (roughly 4080 bytes)
441 * and sizeof(dlm_migratable_lockres) = 112 bytes
442 * and sizeof(dlm_migratable_lock) = 16 bytes
444 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
445 * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
447 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
448 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
449 * NET_MAX_PAYLOAD_BYTES
450 * (240 * 16) + 112 + 128 = 4080
452 * So a lockres would need more than 240 locks before it would
453 * use more than one network packet to recover. Not too bad.
455 #define DLM_MAX_MIGRATABLE_LOCKS 240
457 struct dlm_migratable_lockres
461 u8 num_locks; // locks sent in this structure
463 __be32 total_locks; // locks to be sent for this migration cookie
464 __be64 mig_cookie; // cookie for this lockres migration
465 // or zero if not needed
467 u8 lockname[DLM_LOCKID_NAME_MAX];
471 struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112
473 #define DLM_MIG_LOCKRES_MAX_LEN \
474 (sizeof(struct dlm_migratable_lockres) + \
475 (sizeof(struct dlm_migratable_lock) * \
476 DLM_MAX_MIGRATABLE_LOCKS) )
478 /* from above, 128 bytes
479 * for some undetermined future use */
480 #define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \
481 DLM_MIG_LOCKRES_MAX_LEN)
483 struct dlm_create_lock
493 u8 name[O2NM_MAX_NAME_LEN];
496 struct dlm_convert_lock
506 u8 name[O2NM_MAX_NAME_LEN];
510 #define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
512 struct dlm_unlock_lock
521 u8 name[O2NM_MAX_NAME_LEN];
525 #define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
537 u8 name[O2NM_MAX_NAME_LEN];
541 #define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
543 #define DLM_MOD_KEY (0x666c6172)
544 enum dlm_query_join_response {
550 struct dlm_lock_request
558 struct dlm_reco_data_done
566 /* eventually we can use this to attempt
567 * lvb recovery based on each node's info */
568 u8 reco_lvb[DLM_LVB_LEN];
571 struct dlm_begin_reco
580 struct dlm_query_join_request
585 u8 domain[O2NM_MAX_NAME_LEN];
588 struct dlm_assert_joined
593 u8 domain[O2NM_MAX_NAME_LEN];
596 struct dlm_cancel_join
601 u8 domain[O2NM_MAX_NAME_LEN];
604 struct dlm_exit_domain
610 struct dlm_finalize_reco
618 static inline enum dlm_status
619 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
621 enum dlm_status status = DLM_NORMAL;
623 assert_spin_locked(&res->spinlock);
625 if (res->state & DLM_LOCK_RES_RECOVERING)
626 status = DLM_RECOVERING;
627 else if (res->state & DLM_LOCK_RES_MIGRATING)
628 status = DLM_MIGRATING;
629 else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
630 status = DLM_FORWARD;
635 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
636 struct dlm_lockstatus *lksb);
637 void dlm_lock_get(struct dlm_lock *lock);
638 void dlm_lock_put(struct dlm_lock *lock);
640 void dlm_lock_attach_lockres(struct dlm_lock *lock,
641 struct dlm_lock_resource *res);
643 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
644 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
645 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
647 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
648 struct dlm_lock *lock);
649 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
650 struct dlm_lock *lock);
652 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
653 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
654 struct dlm_lock *lock);
655 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
656 struct dlm_lock *lock);
658 int dlm_launch_thread(struct dlm_ctxt *dlm);
659 void dlm_complete_thread(struct dlm_ctxt *dlm);
660 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
661 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
662 void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
663 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
664 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
666 void dlm_put(struct dlm_ctxt *dlm);
667 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
668 int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
670 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
671 struct dlm_lock_resource *res);
672 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
673 struct dlm_lock_resource *res);
674 void dlm_purge_lockres(struct dlm_ctxt *dlm,
675 struct dlm_lock_resource *lockres);
676 void dlm_lockres_get(struct dlm_lock_resource *res);
677 void dlm_lockres_put(struct dlm_lock_resource *res);
678 void __dlm_unhash_lockres(struct dlm_lock_resource *res);
679 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
680 struct dlm_lock_resource *res);
681 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
684 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
688 int dlm_is_host_down(int errno);
689 void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
690 struct dlm_lock_resource *res,
692 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
695 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
697 unsigned int namelen);
699 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
700 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
701 void dlm_do_local_ast(struct dlm_ctxt *dlm,
702 struct dlm_lock_resource *res,
703 struct dlm_lock *lock);
704 int dlm_do_remote_ast(struct dlm_ctxt *dlm,
705 struct dlm_lock_resource *res,
706 struct dlm_lock *lock);
707 void dlm_do_local_bast(struct dlm_ctxt *dlm,
708 struct dlm_lock_resource *res,
709 struct dlm_lock *lock,
711 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
712 struct dlm_lock_resource *res,
713 struct dlm_lock *lock,
715 int blocked_type, int flags);
716 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
717 struct dlm_lock_resource *res,
718 struct dlm_lock *lock,
721 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
725 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
726 struct dlm_lock_resource *res,
727 struct dlm_lock *lock,
730 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
734 void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
735 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
737 u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
738 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
739 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
742 int dlm_nm_init(struct dlm_ctxt *dlm);
743 int dlm_heartbeat_init(struct dlm_ctxt *dlm);
744 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
745 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
747 int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
748 int dlm_migrate_lockres(struct dlm_ctxt *dlm,
749 struct dlm_lock_resource *res,
751 int dlm_finish_migration(struct dlm_ctxt *dlm,
752 struct dlm_lock_resource *res,
754 void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
755 struct dlm_lock_resource *res);
756 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
758 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
759 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
760 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
761 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
762 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
763 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
764 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
765 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
766 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
768 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
769 struct dlm_lock_resource *res,
775 int dlm_send_one_lockres(struct dlm_ctxt *dlm,
776 struct dlm_lock_resource *res,
777 struct dlm_migratable_lockres *mres,
780 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
781 struct dlm_lock_resource *res);
783 /* will exit holding res->spinlock, but may drop in function */
784 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
785 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
787 /* will exit holding res->spinlock, but may drop in function */
788 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
790 __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
791 DLM_LOCK_RES_RECOVERING|
792 DLM_LOCK_RES_MIGRATING));
796 int dlm_init_mle_cache(void);
797 void dlm_destroy_mle_cache(void);
798 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
799 void dlm_clean_master_list(struct dlm_ctxt *dlm,
801 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
804 static inline const char * dlm_lock_mode_name(int mode)
818 static inline int dlm_lock_compatible(int existing, int request)
820 /* NO_LOCK compatible with all */
821 if (request == LKM_NLMODE ||
822 existing == LKM_NLMODE)
825 /* EX incompatible with all non-NO_LOCK */
826 if (request == LKM_EXMODE)
829 /* request must be PR, which is compatible with PR */
830 if (existing == LKM_PRMODE)
836 static inline int dlm_lock_on_list(struct list_head *head,
837 struct dlm_lock *lock)
839 struct list_head *iter;
840 struct dlm_lock *tmplock;
842 list_for_each(iter, head) {
843 tmplock = list_entry(iter, struct dlm_lock, list);
851 static inline enum dlm_status dlm_err_to_dlm_status(int err)
856 else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
858 else if (err == -EINVAL)
860 else if (err == -ENAMETOOLONG)
868 static inline void dlm_node_iter_init(unsigned long *map,
869 struct dlm_node_iter *iter)
871 memcpy(iter->node_map, map, sizeof(iter->node_map));
875 static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
878 bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
879 if (bit >= O2NM_MAX_NODES) {
880 iter->curnode = O2NM_MAX_NODES;
889 #endif /* DLMCOMMON_H */