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_SIZE_DEFAULT (1 << 14)
41 #if DLM_HASH_SIZE_DEFAULT < PAGE_SIZE
42 # define DLM_HASH_PAGES 1
44 # define DLM_HASH_PAGES (DLM_HASH_SIZE_DEFAULT / PAGE_SIZE)
46 #define DLM_BUCKETS_PER_PAGE (PAGE_SIZE / sizeof(struct hlist_head))
47 #define DLM_HASH_BUCKETS (DLM_HASH_PAGES * DLM_BUCKETS_PER_PAGE)
49 /* Intended to make it easier for us to switch out hash functions */
50 #define dlm_lockid_hash(_n, _l) full_name_hash(_n, _l)
59 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
60 LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
61 LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
63 #define DLM_RECOVERY_LOCK_NAME "$RECOVERY"
64 #define DLM_RECOVERY_LOCK_NAME_LEN 9
66 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
68 if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
69 memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
74 #define DLM_RECO_STATE_ACTIVE 0x0001
76 struct dlm_recovery_ctxt
78 struct list_head resources;
79 struct list_head received;
80 struct list_head node_data;
84 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
85 wait_queue_head_t event;
97 struct list_head list;
98 struct hlist_head **lockres_hash;
99 struct list_head dirty_list;
100 struct list_head purge_list;
101 struct list_head pending_asts;
102 struct list_head pending_basts;
103 unsigned int purge_count;
110 wait_queue_head_t dlm_join_events;
111 unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
112 unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
113 unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
114 struct dlm_recovery_ctxt reco;
115 spinlock_t master_lock;
116 struct list_head master_list;
117 struct list_head mle_hb_events;
119 /* these give a really vague idea of the system load */
120 atomic_t local_resources;
121 atomic_t remote_resources;
122 atomic_t unknown_resources;
124 /* NOTE: Next three are protected by dlm_domain_lock */
125 struct kref dlm_refs;
126 enum dlm_ctxt_state dlm_state;
127 unsigned int num_joins;
129 struct o2hb_callback_func dlm_hb_up;
130 struct o2hb_callback_func dlm_hb_down;
131 struct task_struct *dlm_thread_task;
132 struct task_struct *dlm_reco_thread_task;
133 wait_queue_head_t dlm_thread_wq;
134 wait_queue_head_t dlm_reco_thread_wq;
135 wait_queue_head_t ast_wq;
136 wait_queue_head_t migration_wq;
138 struct work_struct dispatched_work;
139 struct list_head work_list;
140 spinlock_t work_lock;
141 struct list_head dlm_domain_handlers;
142 struct list_head dlm_eviction_callbacks;
145 static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
147 return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE);
150 /* these keventd work queue items are for less-frequently
151 * called functions that cannot be directly called from the
152 * net message handlers for some reason, usually because
153 * they need to send net messages of their own. */
154 void dlm_dispatch_work(void *data);
156 struct dlm_lock_resource;
157 struct dlm_work_item;
159 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
161 struct dlm_request_all_locks_priv
167 struct dlm_mig_lockres_priv
169 struct dlm_lock_resource *lockres;
173 struct dlm_assert_master_priv
175 struct dlm_lock_resource *lockres;
178 unsigned ignore_higher:1;
184 struct list_head list;
185 dlm_workfunc_t *func;
186 struct dlm_ctxt *dlm;
189 struct dlm_request_all_locks_priv ral;
190 struct dlm_mig_lockres_priv ml;
191 struct dlm_assert_master_priv am;
195 static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
196 struct dlm_work_item *i,
197 dlm_workfunc_t *f, void *data)
199 memset(i, 0, sizeof(*i));
201 INIT_LIST_HEAD(&i->list);
203 i->dlm = dlm; /* must have already done a dlm_grab on this! */
208 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
211 assert_spin_locked(&dlm->spinlock);
213 dlm->joining_node = node;
214 wake_up(&dlm->dlm_join_events);
217 #define DLM_LOCK_RES_UNINITED 0x00000001
218 #define DLM_LOCK_RES_RECOVERING 0x00000002
219 #define DLM_LOCK_RES_READY 0x00000004
220 #define DLM_LOCK_RES_DIRTY 0x00000008
221 #define DLM_LOCK_RES_IN_PROGRESS 0x00000010
222 #define DLM_LOCK_RES_MIGRATING 0x00000020
224 /* max milliseconds to wait to sync up a network failure with a node death */
225 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
227 #define DLM_PURGE_INTERVAL_MS (8 * 1000)
229 struct dlm_lock_resource
231 /* WARNING: Please see the comment in dlm_init_lockres before
232 * adding fields here. */
233 struct hlist_node hash_node;
234 struct qstr lockname;
237 /* please keep these next 3 in this order
238 * some funcs want to iterate over all lists */
239 struct list_head granted;
240 struct list_head converting;
241 struct list_head blocked;
243 struct list_head dirty;
244 struct list_head recovering; // dlm_recovery_ctxt.resources list
246 /* unused lock resources have their last_used stamped and are
247 * put on a list for the dlm thread to run. */
248 struct list_head purge;
249 unsigned long last_used;
251 unsigned migration_pending:1;
252 atomic_t asts_reserved;
254 wait_queue_head_t wq;
255 u8 owner; //node which owns the lock resource, or unknown
257 char lvb[DLM_LVB_LEN];
260 struct dlm_migratable_lock
264 /* these 3 are just padding for the in-memory structure, but
265 * list and flags are actually used when sent over the wire */
267 u8 list; // 0=granted, 1=converting, 2=blocked
278 struct dlm_migratable_lock ml;
280 struct list_head list;
281 struct list_head ast_list;
282 struct list_head bast_list;
283 struct dlm_lock_resource *lockres;
285 struct kref lock_refs;
287 // ast and bast must be callable while holding a spinlock!
288 dlm_astlockfunc_t *ast;
289 dlm_bastlockfunc_t *bast;
291 struct dlm_lockstatus *lksb;
292 unsigned ast_pending:1,
298 lksb_kernel_allocated:1;
302 #define DLM_LKSB_UNUSED1 0x01
303 #define DLM_LKSB_PUT_LVB 0x02
304 #define DLM_LKSB_GET_LVB 0x04
305 #define DLM_LKSB_UNUSED2 0x08
306 #define DLM_LKSB_UNUSED3 0x10
307 #define DLM_LKSB_UNUSED4 0x20
308 #define DLM_LKSB_UNUSED5 0x40
309 #define DLM_LKSB_UNUSED6 0x80
312 enum dlm_lockres_list {
313 DLM_GRANTED_LIST = 0,
318 static inline struct list_head *
319 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
321 struct list_head *ret = NULL;
322 if (idx == DLM_GRANTED_LIST)
324 else if (idx == DLM_CONVERTING_LIST)
325 ret = &res->converting;
326 else if (idx == DLM_BLOCKED_LIST)
338 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
344 DLM_MASTER_REQUEST_MSG = 500,
345 DLM_UNUSED_MSG1, /* 501 */
346 DLM_ASSERT_MASTER_MSG, /* 502 */
347 DLM_CREATE_LOCK_MSG, /* 503 */
348 DLM_CONVERT_LOCK_MSG, /* 504 */
349 DLM_PROXY_AST_MSG, /* 505 */
350 DLM_UNLOCK_LOCK_MSG, /* 506 */
351 DLM_UNUSED_MSG2, /* 507 */
352 DLM_MIGRATE_REQUEST_MSG, /* 508 */
353 DLM_MIG_LOCKRES_MSG, /* 509 */
354 DLM_QUERY_JOIN_MSG, /* 510 */
355 DLM_ASSERT_JOINED_MSG, /* 511 */
356 DLM_CANCEL_JOIN_MSG, /* 512 */
357 DLM_EXIT_DOMAIN_MSG, /* 513 */
358 DLM_MASTER_REQUERY_MSG, /* 514 */
359 DLM_LOCK_REQUEST_MSG, /* 515 */
360 DLM_RECO_DATA_DONE_MSG, /* 516 */
361 DLM_BEGIN_RECO_MSG, /* 517 */
362 DLM_FINALIZE_RECO_MSG /* 518 */
365 struct dlm_reco_node_data
369 struct list_head list;
373 DLM_RECO_NODE_DATA_DEAD = -1,
374 DLM_RECO_NODE_DATA_INIT = 0,
375 DLM_RECO_NODE_DATA_REQUESTING,
376 DLM_RECO_NODE_DATA_REQUESTED,
377 DLM_RECO_NODE_DATA_RECEIVING,
378 DLM_RECO_NODE_DATA_DONE,
379 DLM_RECO_NODE_DATA_FINALIZE_SENT,
384 DLM_MASTER_RESP_NO = 0,
386 DLM_MASTER_RESP_MAYBE,
387 DLM_MASTER_RESP_ERROR
391 struct dlm_master_request
398 u8 name[O2NM_MAX_NAME_LEN];
401 #define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
402 #define DLM_ASSERT_MASTER_REQUERY 0x00000002
403 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
404 struct dlm_assert_master
411 u8 name[O2NM_MAX_NAME_LEN];
414 struct dlm_migrate_request
421 u8 name[O2NM_MAX_NAME_LEN];
424 struct dlm_master_requery
431 u8 name[O2NM_MAX_NAME_LEN];
434 #define DLM_MRES_RECOVERY 0x01
435 #define DLM_MRES_MIGRATION 0x02
436 #define DLM_MRES_ALL_DONE 0x04
439 * We would like to get one whole lockres into a single network
440 * message whenever possible. Generally speaking, there will be
441 * at most one dlm_lock on a lockres for each node in the cluster,
442 * plus (infrequently) any additional locks coming in from userdlm.
444 * struct _dlm_lockres_page
446 * dlm_migratable_lockres mres;
447 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
448 * u8 pad[DLM_MIG_LOCKRES_RESERVED];
451 * from ../cluster/tcp.h
452 * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
453 * (roughly 4080 bytes)
454 * and sizeof(dlm_migratable_lockres) = 112 bytes
455 * and sizeof(dlm_migratable_lock) = 16 bytes
457 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
458 * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
460 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
461 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
462 * NET_MAX_PAYLOAD_BYTES
463 * (240 * 16) + 112 + 128 = 4080
465 * So a lockres would need more than 240 locks before it would
466 * use more than one network packet to recover. Not too bad.
468 #define DLM_MAX_MIGRATABLE_LOCKS 240
470 struct dlm_migratable_lockres
474 u8 num_locks; // locks sent in this structure
476 __be32 total_locks; // locks to be sent for this migration cookie
477 __be64 mig_cookie; // cookie for this lockres migration
478 // or zero if not needed
480 u8 lockname[DLM_LOCKID_NAME_MAX];
484 struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112
486 #define DLM_MIG_LOCKRES_MAX_LEN \
487 (sizeof(struct dlm_migratable_lockres) + \
488 (sizeof(struct dlm_migratable_lock) * \
489 DLM_MAX_MIGRATABLE_LOCKS) )
491 /* from above, 128 bytes
492 * for some undetermined future use */
493 #define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \
494 DLM_MIG_LOCKRES_MAX_LEN)
496 struct dlm_create_lock
506 u8 name[O2NM_MAX_NAME_LEN];
509 struct dlm_convert_lock
519 u8 name[O2NM_MAX_NAME_LEN];
523 #define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
525 struct dlm_unlock_lock
534 u8 name[O2NM_MAX_NAME_LEN];
538 #define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
550 u8 name[O2NM_MAX_NAME_LEN];
554 #define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
556 #define DLM_MOD_KEY (0x666c6172)
557 enum dlm_query_join_response {
563 struct dlm_lock_request
571 struct dlm_reco_data_done
579 /* eventually we can use this to attempt
580 * lvb recovery based on each node's info */
581 u8 reco_lvb[DLM_LVB_LEN];
584 struct dlm_begin_reco
593 struct dlm_query_join_request
598 u8 domain[O2NM_MAX_NAME_LEN];
601 struct dlm_assert_joined
606 u8 domain[O2NM_MAX_NAME_LEN];
609 struct dlm_cancel_join
614 u8 domain[O2NM_MAX_NAME_LEN];
617 struct dlm_exit_domain
623 struct dlm_finalize_reco
631 static inline enum dlm_status
632 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
634 enum dlm_status status = DLM_NORMAL;
636 assert_spin_locked(&res->spinlock);
638 if (res->state & DLM_LOCK_RES_RECOVERING)
639 status = DLM_RECOVERING;
640 else if (res->state & DLM_LOCK_RES_MIGRATING)
641 status = DLM_MIGRATING;
642 else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
643 status = DLM_FORWARD;
648 static inline u8 dlm_get_lock_cookie_node(u64 cookie)
652 ret = (u8)(cookie & 0xffULL);
656 static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
658 unsigned long long ret;
659 ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
663 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
664 struct dlm_lockstatus *lksb);
665 void dlm_lock_get(struct dlm_lock *lock);
666 void dlm_lock_put(struct dlm_lock *lock);
668 void dlm_lock_attach_lockres(struct dlm_lock *lock,
669 struct dlm_lock_resource *res);
671 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
672 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
673 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
675 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
676 struct dlm_lock *lock);
677 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
678 struct dlm_lock *lock);
680 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
681 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
682 struct dlm_lock *lock);
683 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
684 struct dlm_lock *lock);
686 int dlm_launch_thread(struct dlm_ctxt *dlm);
687 void dlm_complete_thread(struct dlm_ctxt *dlm);
688 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
689 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
690 void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
691 void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
692 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
693 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
695 void dlm_put(struct dlm_ctxt *dlm);
696 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
697 int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
699 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
700 struct dlm_lock_resource *res);
701 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
702 struct dlm_lock_resource *res);
703 void dlm_purge_lockres(struct dlm_ctxt *dlm,
704 struct dlm_lock_resource *lockres);
705 static inline void dlm_lockres_get(struct dlm_lock_resource *res)
707 /* This is called on every lookup, so it might be worth
709 kref_get(&res->refs);
711 void dlm_lockres_put(struct dlm_lock_resource *res);
712 void __dlm_unhash_lockres(struct dlm_lock_resource *res);
713 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
714 struct dlm_lock_resource *res);
715 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
719 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
723 int dlm_is_host_down(int errno);
724 void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
725 struct dlm_lock_resource *res,
727 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
730 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
732 unsigned int namelen);
734 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
735 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
736 void dlm_do_local_ast(struct dlm_ctxt *dlm,
737 struct dlm_lock_resource *res,
738 struct dlm_lock *lock);
739 int dlm_do_remote_ast(struct dlm_ctxt *dlm,
740 struct dlm_lock_resource *res,
741 struct dlm_lock *lock);
742 void dlm_do_local_bast(struct dlm_ctxt *dlm,
743 struct dlm_lock_resource *res,
744 struct dlm_lock *lock,
746 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
747 struct dlm_lock_resource *res,
748 struct dlm_lock *lock,
750 int blocked_type, int flags);
751 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
752 struct dlm_lock_resource *res,
753 struct dlm_lock *lock,
756 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
760 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
761 struct dlm_lock_resource *res,
762 struct dlm_lock *lock,
765 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
769 void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
770 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
772 u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
773 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
774 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
777 int dlm_nm_init(struct dlm_ctxt *dlm);
778 int dlm_heartbeat_init(struct dlm_ctxt *dlm);
779 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
780 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
782 int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
783 int dlm_migrate_lockres(struct dlm_ctxt *dlm,
784 struct dlm_lock_resource *res,
786 int dlm_finish_migration(struct dlm_ctxt *dlm,
787 struct dlm_lock_resource *res,
789 void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
790 struct dlm_lock_resource *res);
791 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
793 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
794 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
795 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
796 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
797 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
798 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
799 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
800 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
801 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
802 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
803 u8 nodenum, u8 *real_master);
804 int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
805 struct dlm_lock_resource *res, u8 *real_master);
808 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
809 struct dlm_lock_resource *res,
815 int dlm_send_one_lockres(struct dlm_ctxt *dlm,
816 struct dlm_lock_resource *res,
817 struct dlm_migratable_lockres *mres,
820 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
821 struct dlm_lock_resource *res);
823 /* will exit holding res->spinlock, but may drop in function */
824 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
825 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
827 /* will exit holding res->spinlock, but may drop in function */
828 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
830 __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
831 DLM_LOCK_RES_RECOVERING|
832 DLM_LOCK_RES_MIGRATING));
836 int dlm_init_mle_cache(void);
837 void dlm_destroy_mle_cache(void);
838 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
839 void dlm_clean_master_list(struct dlm_ctxt *dlm,
841 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
844 static inline const char * dlm_lock_mode_name(int mode)
858 static inline int dlm_lock_compatible(int existing, int request)
860 /* NO_LOCK compatible with all */
861 if (request == LKM_NLMODE ||
862 existing == LKM_NLMODE)
865 /* EX incompatible with all non-NO_LOCK */
866 if (request == LKM_EXMODE)
869 /* request must be PR, which is compatible with PR */
870 if (existing == LKM_PRMODE)
876 static inline int dlm_lock_on_list(struct list_head *head,
877 struct dlm_lock *lock)
879 struct list_head *iter;
880 struct dlm_lock *tmplock;
882 list_for_each(iter, head) {
883 tmplock = list_entry(iter, struct dlm_lock, list);
891 static inline enum dlm_status dlm_err_to_dlm_status(int err)
896 else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
898 else if (err == -EINVAL)
900 else if (err == -ENAMETOOLONG)
908 static inline void dlm_node_iter_init(unsigned long *map,
909 struct dlm_node_iter *iter)
911 memcpy(iter->node_map, map, sizeof(iter->node_map));
915 static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
918 bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
919 if (bit >= O2NM_MAX_NODES) {
920 iter->curnode = O2NM_MAX_NODES;
929 #endif /* DLMCOMMON_H */