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 (1 << 14)
41 #define DLM_HASH_PAGES (DLM_HASH_SIZE / PAGE_SIZE)
42 #define DLM_BUCKETS_PER_PAGE (PAGE_SIZE / sizeof(struct hlist_head))
43 #define DLM_HASH_BUCKETS (DLM_HASH_PAGES * DLM_BUCKETS_PER_PAGE)
45 /* Intended to make it easier for us to switch out hash functions */
46 #define dlm_lockid_hash(_n, _l) full_name_hash(_n, _l)
55 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
56 LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
57 LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
59 #define DLM_RECOVERY_LOCK_NAME "$RECOVERY"
60 #define DLM_RECOVERY_LOCK_NAME_LEN 9
62 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
64 if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
65 memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
70 #define DLM_RECO_STATE_ACTIVE 0x0001
72 struct dlm_recovery_ctxt
74 struct list_head resources;
75 struct list_head received;
76 struct list_head node_data;
80 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
81 wait_queue_head_t event;
93 struct list_head list;
94 struct hlist_head **lockres_hash;
95 struct list_head dirty_list;
96 struct list_head purge_list;
97 struct list_head pending_asts;
98 struct list_head pending_basts;
99 unsigned int purge_count;
106 wait_queue_head_t dlm_join_events;
107 unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
108 unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
109 unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
110 struct dlm_recovery_ctxt reco;
111 spinlock_t master_lock;
112 struct list_head master_list;
113 struct list_head mle_hb_events;
115 /* these give a really vague idea of the system load */
116 atomic_t local_resources;
117 atomic_t remote_resources;
118 atomic_t unknown_resources;
120 /* NOTE: Next three are protected by dlm_domain_lock */
121 struct kref dlm_refs;
122 enum dlm_ctxt_state dlm_state;
123 unsigned int num_joins;
125 struct o2hb_callback_func dlm_hb_up;
126 struct o2hb_callback_func dlm_hb_down;
127 struct task_struct *dlm_thread_task;
128 struct task_struct *dlm_reco_thread_task;
129 wait_queue_head_t dlm_thread_wq;
130 wait_queue_head_t dlm_reco_thread_wq;
131 wait_queue_head_t ast_wq;
132 wait_queue_head_t migration_wq;
134 struct work_struct dispatched_work;
135 struct list_head work_list;
136 spinlock_t work_lock;
137 struct list_head dlm_domain_handlers;
138 struct list_head dlm_eviction_callbacks;
141 static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
143 return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE);
146 /* these keventd work queue items are for less-frequently
147 * called functions that cannot be directly called from the
148 * net message handlers for some reason, usually because
149 * they need to send net messages of their own. */
150 void dlm_dispatch_work(void *data);
152 struct dlm_lock_resource;
153 struct dlm_work_item;
155 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
157 struct dlm_request_all_locks_priv
163 struct dlm_mig_lockres_priv
165 struct dlm_lock_resource *lockres;
169 struct dlm_assert_master_priv
171 struct dlm_lock_resource *lockres;
174 unsigned ignore_higher:1;
180 struct list_head list;
181 dlm_workfunc_t *func;
182 struct dlm_ctxt *dlm;
185 struct dlm_request_all_locks_priv ral;
186 struct dlm_mig_lockres_priv ml;
187 struct dlm_assert_master_priv am;
191 static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
192 struct dlm_work_item *i,
193 dlm_workfunc_t *f, void *data)
195 memset(i, 0, sizeof(*i));
197 INIT_LIST_HEAD(&i->list);
199 i->dlm = dlm; /* must have already done a dlm_grab on this! */
204 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
207 assert_spin_locked(&dlm->spinlock);
209 dlm->joining_node = node;
210 wake_up(&dlm->dlm_join_events);
213 #define DLM_LOCK_RES_UNINITED 0x00000001
214 #define DLM_LOCK_RES_RECOVERING 0x00000002
215 #define DLM_LOCK_RES_READY 0x00000004
216 #define DLM_LOCK_RES_DIRTY 0x00000008
217 #define DLM_LOCK_RES_IN_PROGRESS 0x00000010
218 #define DLM_LOCK_RES_MIGRATING 0x00000020
220 /* max milliseconds to wait to sync up a network failure with a node death */
221 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
223 #define DLM_PURGE_INTERVAL_MS (8 * 1000)
225 struct dlm_lock_resource
227 /* WARNING: Please see the comment in dlm_init_lockres before
228 * adding fields here. */
229 struct hlist_node hash_node;
230 struct qstr lockname;
233 /* please keep these next 3 in this order
234 * some funcs want to iterate over all lists */
235 struct list_head granted;
236 struct list_head converting;
237 struct list_head blocked;
239 struct list_head dirty;
240 struct list_head recovering; // dlm_recovery_ctxt.resources list
242 /* unused lock resources have their last_used stamped and are
243 * put on a list for the dlm thread to run. */
244 struct list_head purge;
245 unsigned long last_used;
247 unsigned migration_pending:1;
248 atomic_t asts_reserved;
250 wait_queue_head_t wq;
251 u8 owner; //node which owns the lock resource, or unknown
253 char lvb[DLM_LVB_LEN];
256 struct dlm_migratable_lock
260 /* these 3 are just padding for the in-memory structure, but
261 * list and flags are actually used when sent over the wire */
263 u8 list; // 0=granted, 1=converting, 2=blocked
274 struct dlm_migratable_lock ml;
276 struct list_head list;
277 struct list_head ast_list;
278 struct list_head bast_list;
279 struct dlm_lock_resource *lockres;
281 struct kref lock_refs;
283 // ast and bast must be callable while holding a spinlock!
284 dlm_astlockfunc_t *ast;
285 dlm_bastlockfunc_t *bast;
287 struct dlm_lockstatus *lksb;
288 unsigned ast_pending:1,
294 lksb_kernel_allocated:1;
298 #define DLM_LKSB_UNUSED1 0x01
299 #define DLM_LKSB_PUT_LVB 0x02
300 #define DLM_LKSB_GET_LVB 0x04
301 #define DLM_LKSB_UNUSED2 0x08
302 #define DLM_LKSB_UNUSED3 0x10
303 #define DLM_LKSB_UNUSED4 0x20
304 #define DLM_LKSB_UNUSED5 0x40
305 #define DLM_LKSB_UNUSED6 0x80
308 enum dlm_lockres_list {
309 DLM_GRANTED_LIST = 0,
314 static inline struct list_head *
315 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
317 struct list_head *ret = NULL;
318 if (idx == DLM_GRANTED_LIST)
320 else if (idx == DLM_CONVERTING_LIST)
321 ret = &res->converting;
322 else if (idx == DLM_BLOCKED_LIST)
334 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
340 DLM_MASTER_REQUEST_MSG = 500,
341 DLM_UNUSED_MSG1, /* 501 */
342 DLM_ASSERT_MASTER_MSG, /* 502 */
343 DLM_CREATE_LOCK_MSG, /* 503 */
344 DLM_CONVERT_LOCK_MSG, /* 504 */
345 DLM_PROXY_AST_MSG, /* 505 */
346 DLM_UNLOCK_LOCK_MSG, /* 506 */
347 DLM_UNUSED_MSG2, /* 507 */
348 DLM_MIGRATE_REQUEST_MSG, /* 508 */
349 DLM_MIG_LOCKRES_MSG, /* 509 */
350 DLM_QUERY_JOIN_MSG, /* 510 */
351 DLM_ASSERT_JOINED_MSG, /* 511 */
352 DLM_CANCEL_JOIN_MSG, /* 512 */
353 DLM_EXIT_DOMAIN_MSG, /* 513 */
354 DLM_MASTER_REQUERY_MSG, /* 514 */
355 DLM_LOCK_REQUEST_MSG, /* 515 */
356 DLM_RECO_DATA_DONE_MSG, /* 516 */
357 DLM_BEGIN_RECO_MSG, /* 517 */
358 DLM_FINALIZE_RECO_MSG /* 518 */
361 struct dlm_reco_node_data
365 struct list_head list;
369 DLM_RECO_NODE_DATA_DEAD = -1,
370 DLM_RECO_NODE_DATA_INIT = 0,
371 DLM_RECO_NODE_DATA_REQUESTING,
372 DLM_RECO_NODE_DATA_REQUESTED,
373 DLM_RECO_NODE_DATA_RECEIVING,
374 DLM_RECO_NODE_DATA_DONE,
375 DLM_RECO_NODE_DATA_FINALIZE_SENT,
380 DLM_MASTER_RESP_NO = 0,
382 DLM_MASTER_RESP_MAYBE,
383 DLM_MASTER_RESP_ERROR
387 struct dlm_master_request
394 u8 name[O2NM_MAX_NAME_LEN];
397 #define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
398 #define DLM_ASSERT_MASTER_REQUERY 0x00000002
399 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
400 struct dlm_assert_master
407 u8 name[O2NM_MAX_NAME_LEN];
410 struct dlm_migrate_request
417 u8 name[O2NM_MAX_NAME_LEN];
420 struct dlm_master_requery
427 u8 name[O2NM_MAX_NAME_LEN];
430 #define DLM_MRES_RECOVERY 0x01
431 #define DLM_MRES_MIGRATION 0x02
432 #define DLM_MRES_ALL_DONE 0x04
435 * We would like to get one whole lockres into a single network
436 * message whenever possible. Generally speaking, there will be
437 * at most one dlm_lock on a lockres for each node in the cluster,
438 * plus (infrequently) any additional locks coming in from userdlm.
440 * struct _dlm_lockres_page
442 * dlm_migratable_lockres mres;
443 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
444 * u8 pad[DLM_MIG_LOCKRES_RESERVED];
447 * from ../cluster/tcp.h
448 * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
449 * (roughly 4080 bytes)
450 * and sizeof(dlm_migratable_lockres) = 112 bytes
451 * and sizeof(dlm_migratable_lock) = 16 bytes
453 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
454 * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
456 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
457 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
458 * NET_MAX_PAYLOAD_BYTES
459 * (240 * 16) + 112 + 128 = 4080
461 * So a lockres would need more than 240 locks before it would
462 * use more than one network packet to recover. Not too bad.
464 #define DLM_MAX_MIGRATABLE_LOCKS 240
466 struct dlm_migratable_lockres
470 u8 num_locks; // locks sent in this structure
472 __be32 total_locks; // locks to be sent for this migration cookie
473 __be64 mig_cookie; // cookie for this lockres migration
474 // or zero if not needed
476 u8 lockname[DLM_LOCKID_NAME_MAX];
480 struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112
482 #define DLM_MIG_LOCKRES_MAX_LEN \
483 (sizeof(struct dlm_migratable_lockres) + \
484 (sizeof(struct dlm_migratable_lock) * \
485 DLM_MAX_MIGRATABLE_LOCKS) )
487 /* from above, 128 bytes
488 * for some undetermined future use */
489 #define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \
490 DLM_MIG_LOCKRES_MAX_LEN)
492 struct dlm_create_lock
502 u8 name[O2NM_MAX_NAME_LEN];
505 struct dlm_convert_lock
515 u8 name[O2NM_MAX_NAME_LEN];
519 #define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
521 struct dlm_unlock_lock
530 u8 name[O2NM_MAX_NAME_LEN];
534 #define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
546 u8 name[O2NM_MAX_NAME_LEN];
550 #define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
552 #define DLM_MOD_KEY (0x666c6172)
553 enum dlm_query_join_response {
559 struct dlm_lock_request
567 struct dlm_reco_data_done
575 /* eventually we can use this to attempt
576 * lvb recovery based on each node's info */
577 u8 reco_lvb[DLM_LVB_LEN];
580 struct dlm_begin_reco
589 struct dlm_query_join_request
594 u8 domain[O2NM_MAX_NAME_LEN];
597 struct dlm_assert_joined
602 u8 domain[O2NM_MAX_NAME_LEN];
605 struct dlm_cancel_join
610 u8 domain[O2NM_MAX_NAME_LEN];
613 struct dlm_exit_domain
619 struct dlm_finalize_reco
627 static inline enum dlm_status
628 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
630 enum dlm_status status = DLM_NORMAL;
632 assert_spin_locked(&res->spinlock);
634 if (res->state & DLM_LOCK_RES_RECOVERING)
635 status = DLM_RECOVERING;
636 else if (res->state & DLM_LOCK_RES_MIGRATING)
637 status = DLM_MIGRATING;
638 else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
639 status = DLM_FORWARD;
644 static inline u8 dlm_get_lock_cookie_node(u64 cookie)
648 ret = (u8)(cookie & 0xffULL);
652 static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
654 unsigned long long ret;
655 ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
659 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
660 struct dlm_lockstatus *lksb);
661 void dlm_lock_get(struct dlm_lock *lock);
662 void dlm_lock_put(struct dlm_lock *lock);
664 void dlm_lock_attach_lockres(struct dlm_lock *lock,
665 struct dlm_lock_resource *res);
667 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
668 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
669 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
671 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
672 struct dlm_lock *lock);
673 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
674 struct dlm_lock *lock);
676 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
677 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
678 struct dlm_lock *lock);
679 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
680 struct dlm_lock *lock);
682 int dlm_launch_thread(struct dlm_ctxt *dlm);
683 void dlm_complete_thread(struct dlm_ctxt *dlm);
684 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
685 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
686 void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
687 void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
688 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
689 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
691 void dlm_put(struct dlm_ctxt *dlm);
692 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
693 int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
695 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
696 struct dlm_lock_resource *res);
697 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
698 struct dlm_lock_resource *res);
699 void dlm_purge_lockres(struct dlm_ctxt *dlm,
700 struct dlm_lock_resource *lockres);
701 static inline void dlm_lockres_get(struct dlm_lock_resource *res)
703 /* This is called on every lookup, so it might be worth
705 kref_get(&res->refs);
707 void dlm_lockres_put(struct dlm_lock_resource *res);
708 void __dlm_unhash_lockres(struct dlm_lock_resource *res);
709 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
710 struct dlm_lock_resource *res);
711 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
715 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
719 int dlm_is_host_down(int errno);
720 void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
721 struct dlm_lock_resource *res,
723 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
726 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
728 unsigned int namelen);
730 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
731 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
732 void dlm_do_local_ast(struct dlm_ctxt *dlm,
733 struct dlm_lock_resource *res,
734 struct dlm_lock *lock);
735 int dlm_do_remote_ast(struct dlm_ctxt *dlm,
736 struct dlm_lock_resource *res,
737 struct dlm_lock *lock);
738 void dlm_do_local_bast(struct dlm_ctxt *dlm,
739 struct dlm_lock_resource *res,
740 struct dlm_lock *lock,
742 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
743 struct dlm_lock_resource *res,
744 struct dlm_lock *lock,
746 int blocked_type, int flags);
747 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
748 struct dlm_lock_resource *res,
749 struct dlm_lock *lock,
752 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
756 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
757 struct dlm_lock_resource *res,
758 struct dlm_lock *lock,
761 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
765 void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
766 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
768 u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
769 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
770 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
773 int dlm_nm_init(struct dlm_ctxt *dlm);
774 int dlm_heartbeat_init(struct dlm_ctxt *dlm);
775 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
776 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
778 int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
779 int dlm_migrate_lockres(struct dlm_ctxt *dlm,
780 struct dlm_lock_resource *res,
782 int dlm_finish_migration(struct dlm_ctxt *dlm,
783 struct dlm_lock_resource *res,
785 void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
786 struct dlm_lock_resource *res);
787 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
789 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
790 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
791 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
792 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
793 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
794 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
795 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
796 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
797 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
798 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
799 u8 nodenum, u8 *real_master);
800 int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
801 struct dlm_lock_resource *res, u8 *real_master);
804 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
805 struct dlm_lock_resource *res,
811 int dlm_send_one_lockres(struct dlm_ctxt *dlm,
812 struct dlm_lock_resource *res,
813 struct dlm_migratable_lockres *mres,
816 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
817 struct dlm_lock_resource *res);
819 /* will exit holding res->spinlock, but may drop in function */
820 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
821 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
823 /* will exit holding res->spinlock, but may drop in function */
824 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
826 __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
827 DLM_LOCK_RES_RECOVERING|
828 DLM_LOCK_RES_MIGRATING));
832 int dlm_init_mle_cache(void);
833 void dlm_destroy_mle_cache(void);
834 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
835 void dlm_clean_master_list(struct dlm_ctxt *dlm,
837 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
840 static inline const char * dlm_lock_mode_name(int mode)
854 static inline int dlm_lock_compatible(int existing, int request)
856 /* NO_LOCK compatible with all */
857 if (request == LKM_NLMODE ||
858 existing == LKM_NLMODE)
861 /* EX incompatible with all non-NO_LOCK */
862 if (request == LKM_EXMODE)
865 /* request must be PR, which is compatible with PR */
866 if (existing == LKM_PRMODE)
872 static inline int dlm_lock_on_list(struct list_head *head,
873 struct dlm_lock *lock)
875 struct list_head *iter;
876 struct dlm_lock *tmplock;
878 list_for_each(iter, head) {
879 tmplock = list_entry(iter, struct dlm_lock, list);
887 static inline enum dlm_status dlm_err_to_dlm_status(int err)
892 else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
894 else if (err == -EINVAL)
896 else if (err == -ENAMETOOLONG)
904 static inline void dlm_node_iter_init(unsigned long *map,
905 struct dlm_node_iter *iter)
907 memcpy(iter->node_map, map, sizeof(iter->node_map));
911 static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
914 bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
915 if (bit >= O2NM_MAX_NODES) {
916 iter->curnode = O2NM_MAX_NODES;
925 #endif /* DLMCOMMON_H */