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
75 #define DLM_RECO_STATE_FINALIZE 0x0002
77 struct dlm_recovery_ctxt
79 struct list_head resources;
80 struct list_head received;
81 struct list_head node_data;
85 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
86 wait_queue_head_t event;
98 struct list_head list;
99 struct hlist_head **lockres_hash;
100 struct list_head dirty_list;
101 struct list_head purge_list;
102 struct list_head pending_asts;
103 struct list_head pending_basts;
104 unsigned int purge_count;
111 wait_queue_head_t dlm_join_events;
112 unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
113 unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
114 unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
115 struct dlm_recovery_ctxt reco;
116 spinlock_t master_lock;
117 struct list_head master_list;
118 struct list_head mle_hb_events;
120 /* these give a really vague idea of the system load */
121 atomic_t local_resources;
122 atomic_t remote_resources;
123 atomic_t unknown_resources;
125 /* NOTE: Next three are protected by dlm_domain_lock */
126 struct kref dlm_refs;
127 enum dlm_ctxt_state dlm_state;
128 unsigned int num_joins;
130 struct o2hb_callback_func dlm_hb_up;
131 struct o2hb_callback_func dlm_hb_down;
132 struct task_struct *dlm_thread_task;
133 struct task_struct *dlm_reco_thread_task;
134 struct workqueue_struct *dlm_worker;
135 wait_queue_head_t dlm_thread_wq;
136 wait_queue_head_t dlm_reco_thread_wq;
137 wait_queue_head_t ast_wq;
138 wait_queue_head_t migration_wq;
140 struct work_struct dispatched_work;
141 struct list_head work_list;
142 spinlock_t work_lock;
143 struct list_head dlm_domain_handlers;
144 struct list_head dlm_eviction_callbacks;
147 static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
149 return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE);
152 /* these keventd work queue items are for less-frequently
153 * called functions that cannot be directly called from the
154 * net message handlers for some reason, usually because
155 * they need to send net messages of their own. */
156 void dlm_dispatch_work(struct work_struct *work);
158 struct dlm_lock_resource;
159 struct dlm_work_item;
161 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
163 struct dlm_request_all_locks_priv
169 struct dlm_mig_lockres_priv
171 struct dlm_lock_resource *lockres;
175 struct dlm_assert_master_priv
177 struct dlm_lock_resource *lockres;
180 unsigned ignore_higher:1;
186 struct list_head list;
187 dlm_workfunc_t *func;
188 struct dlm_ctxt *dlm;
191 struct dlm_request_all_locks_priv ral;
192 struct dlm_mig_lockres_priv ml;
193 struct dlm_assert_master_priv am;
197 static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
198 struct dlm_work_item *i,
199 dlm_workfunc_t *f, void *data)
201 memset(i, 0, sizeof(*i));
203 INIT_LIST_HEAD(&i->list);
205 i->dlm = dlm; /* must have already done a dlm_grab on this! */
210 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
213 assert_spin_locked(&dlm->spinlock);
215 dlm->joining_node = node;
216 wake_up(&dlm->dlm_join_events);
219 #define DLM_LOCK_RES_UNINITED 0x00000001
220 #define DLM_LOCK_RES_RECOVERING 0x00000002
221 #define DLM_LOCK_RES_READY 0x00000004
222 #define DLM_LOCK_RES_DIRTY 0x00000008
223 #define DLM_LOCK_RES_IN_PROGRESS 0x00000010
224 #define DLM_LOCK_RES_MIGRATING 0x00000020
226 /* max milliseconds to wait to sync up a network failure with a node death */
227 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
229 #define DLM_PURGE_INTERVAL_MS (8 * 1000)
231 struct dlm_lock_resource
233 /* WARNING: Please see the comment in dlm_init_lockres before
234 * adding fields here. */
235 struct hlist_node hash_node;
236 struct qstr lockname;
240 * Please keep granted, converting, and blocked in this order,
241 * as some funcs want to iterate over all lists.
243 * All four lists are protected by the hash's reference.
245 struct list_head granted;
246 struct list_head converting;
247 struct list_head blocked;
248 struct list_head purge;
251 * These two lists require you to hold an additional reference
252 * while they are on the list.
254 struct list_head dirty;
255 struct list_head recovering; // dlm_recovery_ctxt.resources list
257 /* unused lock resources have their last_used stamped and are
258 * put on a list for the dlm thread to run. */
259 unsigned long last_used;
261 unsigned migration_pending:1;
262 atomic_t asts_reserved;
264 wait_queue_head_t wq;
265 u8 owner; //node which owns the lock resource, or unknown
267 char lvb[DLM_LVB_LEN];
270 struct dlm_migratable_lock
274 /* these 3 are just padding for the in-memory structure, but
275 * list and flags are actually used when sent over the wire */
277 u8 list; // 0=granted, 1=converting, 2=blocked
288 struct dlm_migratable_lock ml;
290 struct list_head list;
291 struct list_head ast_list;
292 struct list_head bast_list;
293 struct dlm_lock_resource *lockres;
295 struct kref lock_refs;
297 // ast and bast must be callable while holding a spinlock!
298 dlm_astlockfunc_t *ast;
299 dlm_bastlockfunc_t *bast;
301 struct dlm_lockstatus *lksb;
302 unsigned ast_pending:1,
308 lksb_kernel_allocated:1;
312 #define DLM_LKSB_UNUSED1 0x01
313 #define DLM_LKSB_PUT_LVB 0x02
314 #define DLM_LKSB_GET_LVB 0x04
315 #define DLM_LKSB_UNUSED2 0x08
316 #define DLM_LKSB_UNUSED3 0x10
317 #define DLM_LKSB_UNUSED4 0x20
318 #define DLM_LKSB_UNUSED5 0x40
319 #define DLM_LKSB_UNUSED6 0x80
322 enum dlm_lockres_list {
323 DLM_GRANTED_LIST = 0,
328 static inline int dlm_lvb_is_empty(char *lvb)
331 for (i=0; i<DLM_LVB_LEN; i++)
337 static inline struct list_head *
338 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
340 struct list_head *ret = NULL;
341 if (idx == DLM_GRANTED_LIST)
343 else if (idx == DLM_CONVERTING_LIST)
344 ret = &res->converting;
345 else if (idx == DLM_BLOCKED_LIST)
357 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
363 DLM_MASTER_REQUEST_MSG = 500,
364 DLM_UNUSED_MSG1, /* 501 */
365 DLM_ASSERT_MASTER_MSG, /* 502 */
366 DLM_CREATE_LOCK_MSG, /* 503 */
367 DLM_CONVERT_LOCK_MSG, /* 504 */
368 DLM_PROXY_AST_MSG, /* 505 */
369 DLM_UNLOCK_LOCK_MSG, /* 506 */
370 DLM_UNUSED_MSG2, /* 507 */
371 DLM_MIGRATE_REQUEST_MSG, /* 508 */
372 DLM_MIG_LOCKRES_MSG, /* 509 */
373 DLM_QUERY_JOIN_MSG, /* 510 */
374 DLM_ASSERT_JOINED_MSG, /* 511 */
375 DLM_CANCEL_JOIN_MSG, /* 512 */
376 DLM_EXIT_DOMAIN_MSG, /* 513 */
377 DLM_MASTER_REQUERY_MSG, /* 514 */
378 DLM_LOCK_REQUEST_MSG, /* 515 */
379 DLM_RECO_DATA_DONE_MSG, /* 516 */
380 DLM_BEGIN_RECO_MSG, /* 517 */
381 DLM_FINALIZE_RECO_MSG /* 518 */
384 struct dlm_reco_node_data
388 struct list_head list;
392 DLM_RECO_NODE_DATA_DEAD = -1,
393 DLM_RECO_NODE_DATA_INIT = 0,
394 DLM_RECO_NODE_DATA_REQUESTING,
395 DLM_RECO_NODE_DATA_REQUESTED,
396 DLM_RECO_NODE_DATA_RECEIVING,
397 DLM_RECO_NODE_DATA_DONE,
398 DLM_RECO_NODE_DATA_FINALIZE_SENT,
403 DLM_MASTER_RESP_NO = 0,
405 DLM_MASTER_RESP_MAYBE,
406 DLM_MASTER_RESP_ERROR
410 struct dlm_master_request
417 u8 name[O2NM_MAX_NAME_LEN];
420 #define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
421 #define DLM_ASSERT_MASTER_REQUERY 0x00000002
422 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
423 struct dlm_assert_master
430 u8 name[O2NM_MAX_NAME_LEN];
433 struct dlm_migrate_request
440 u8 name[O2NM_MAX_NAME_LEN];
443 struct dlm_master_requery
450 u8 name[O2NM_MAX_NAME_LEN];
453 #define DLM_MRES_RECOVERY 0x01
454 #define DLM_MRES_MIGRATION 0x02
455 #define DLM_MRES_ALL_DONE 0x04
458 * We would like to get one whole lockres into a single network
459 * message whenever possible. Generally speaking, there will be
460 * at most one dlm_lock on a lockres for each node in the cluster,
461 * plus (infrequently) any additional locks coming in from userdlm.
463 * struct _dlm_lockres_page
465 * dlm_migratable_lockres mres;
466 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
467 * u8 pad[DLM_MIG_LOCKRES_RESERVED];
470 * from ../cluster/tcp.h
471 * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
472 * (roughly 4080 bytes)
473 * and sizeof(dlm_migratable_lockres) = 112 bytes
474 * and sizeof(dlm_migratable_lock) = 16 bytes
476 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
477 * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
479 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
480 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
481 * NET_MAX_PAYLOAD_BYTES
482 * (240 * 16) + 112 + 128 = 4080
484 * So a lockres would need more than 240 locks before it would
485 * use more than one network packet to recover. Not too bad.
487 #define DLM_MAX_MIGRATABLE_LOCKS 240
489 struct dlm_migratable_lockres
493 u8 num_locks; // locks sent in this structure
495 __be32 total_locks; // locks to be sent for this migration cookie
496 __be64 mig_cookie; // cookie for this lockres migration
497 // or zero if not needed
499 u8 lockname[DLM_LOCKID_NAME_MAX];
503 struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112
505 #define DLM_MIG_LOCKRES_MAX_LEN \
506 (sizeof(struct dlm_migratable_lockres) + \
507 (sizeof(struct dlm_migratable_lock) * \
508 DLM_MAX_MIGRATABLE_LOCKS) )
510 /* from above, 128 bytes
511 * for some undetermined future use */
512 #define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \
513 DLM_MIG_LOCKRES_MAX_LEN)
515 struct dlm_create_lock
525 u8 name[O2NM_MAX_NAME_LEN];
528 struct dlm_convert_lock
538 u8 name[O2NM_MAX_NAME_LEN];
542 #define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
544 struct dlm_unlock_lock
553 u8 name[O2NM_MAX_NAME_LEN];
557 #define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
569 u8 name[O2NM_MAX_NAME_LEN];
573 #define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
575 #define DLM_MOD_KEY (0x666c6172)
576 enum dlm_query_join_response {
582 struct dlm_lock_request
590 struct dlm_reco_data_done
598 /* eventually we can use this to attempt
599 * lvb recovery based on each node's info */
600 u8 reco_lvb[DLM_LVB_LEN];
603 struct dlm_begin_reco
612 struct dlm_query_join_request
617 u8 domain[O2NM_MAX_NAME_LEN];
620 struct dlm_assert_joined
625 u8 domain[O2NM_MAX_NAME_LEN];
628 struct dlm_cancel_join
633 u8 domain[O2NM_MAX_NAME_LEN];
636 struct dlm_exit_domain
642 struct dlm_finalize_reco
651 static inline enum dlm_status
652 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
654 enum dlm_status status = DLM_NORMAL;
656 assert_spin_locked(&res->spinlock);
658 if (res->state & DLM_LOCK_RES_RECOVERING)
659 status = DLM_RECOVERING;
660 else if (res->state & DLM_LOCK_RES_MIGRATING)
661 status = DLM_MIGRATING;
662 else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
663 status = DLM_FORWARD;
668 static inline u8 dlm_get_lock_cookie_node(u64 cookie)
672 ret = (u8)(cookie & 0xffULL);
676 static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
678 unsigned long long ret;
679 ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
683 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
684 struct dlm_lockstatus *lksb);
685 void dlm_lock_get(struct dlm_lock *lock);
686 void dlm_lock_put(struct dlm_lock *lock);
688 void dlm_lock_attach_lockres(struct dlm_lock *lock,
689 struct dlm_lock_resource *res);
691 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
692 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
693 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
695 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
696 struct dlm_lock *lock);
697 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
698 struct dlm_lock *lock);
700 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
701 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
702 struct dlm_lock *lock);
703 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
704 struct dlm_lock *lock);
706 int dlm_launch_thread(struct dlm_ctxt *dlm);
707 void dlm_complete_thread(struct dlm_ctxt *dlm);
708 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
709 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
710 void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
711 void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
712 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
713 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
714 int dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout);
716 void dlm_put(struct dlm_ctxt *dlm);
717 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
718 int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
720 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
721 struct dlm_lock_resource *res);
722 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
723 struct dlm_lock_resource *res);
724 void dlm_purge_lockres(struct dlm_ctxt *dlm,
725 struct dlm_lock_resource *lockres);
726 static inline void dlm_lockres_get(struct dlm_lock_resource *res)
728 /* This is called on every lookup, so it might be worth
730 kref_get(&res->refs);
732 void dlm_lockres_put(struct dlm_lock_resource *res);
733 void __dlm_unhash_lockres(struct dlm_lock_resource *res);
734 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
735 struct dlm_lock_resource *res);
736 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
740 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
744 int dlm_is_host_down(int errno);
745 void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
746 struct dlm_lock_resource *res,
748 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
752 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
754 unsigned int namelen);
756 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
757 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
758 void dlm_do_local_ast(struct dlm_ctxt *dlm,
759 struct dlm_lock_resource *res,
760 struct dlm_lock *lock);
761 int dlm_do_remote_ast(struct dlm_ctxt *dlm,
762 struct dlm_lock_resource *res,
763 struct dlm_lock *lock);
764 void dlm_do_local_bast(struct dlm_ctxt *dlm,
765 struct dlm_lock_resource *res,
766 struct dlm_lock *lock,
768 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
769 struct dlm_lock_resource *res,
770 struct dlm_lock *lock,
772 int blocked_type, int flags);
773 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
774 struct dlm_lock_resource *res,
775 struct dlm_lock *lock,
778 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
782 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
783 struct dlm_lock_resource *res,
784 struct dlm_lock *lock,
787 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
791 void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
792 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
794 u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
795 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
796 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
799 int dlm_nm_init(struct dlm_ctxt *dlm);
800 int dlm_heartbeat_init(struct dlm_ctxt *dlm);
801 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
802 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
804 int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
805 int dlm_migrate_lockres(struct dlm_ctxt *dlm,
806 struct dlm_lock_resource *res,
808 int dlm_finish_migration(struct dlm_ctxt *dlm,
809 struct dlm_lock_resource *res,
811 void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
812 struct dlm_lock_resource *res);
813 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
815 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
816 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
817 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
818 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
819 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
820 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
821 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
822 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
823 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
824 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
825 u8 nodenum, u8 *real_master);
828 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
829 struct dlm_lock_resource *res,
835 int dlm_send_one_lockres(struct dlm_ctxt *dlm,
836 struct dlm_lock_resource *res,
837 struct dlm_migratable_lockres *mres,
840 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
841 struct dlm_lock_resource *res);
843 /* will exit holding res->spinlock, but may drop in function */
844 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
845 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
847 /* will exit holding res->spinlock, but may drop in function */
848 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
850 __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
851 DLM_LOCK_RES_RECOVERING|
852 DLM_LOCK_RES_MIGRATING));
856 int dlm_init_mle_cache(void);
857 void dlm_destroy_mle_cache(void);
858 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
859 void dlm_clean_master_list(struct dlm_ctxt *dlm,
861 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
863 int __dlm_lockres_unused(struct dlm_lock_resource *res);
865 static inline const char * dlm_lock_mode_name(int mode)
879 static inline int dlm_lock_compatible(int existing, int request)
881 /* NO_LOCK compatible with all */
882 if (request == LKM_NLMODE ||
883 existing == LKM_NLMODE)
886 /* EX incompatible with all non-NO_LOCK */
887 if (request == LKM_EXMODE)
890 /* request must be PR, which is compatible with PR */
891 if (existing == LKM_PRMODE)
897 static inline int dlm_lock_on_list(struct list_head *head,
898 struct dlm_lock *lock)
900 struct list_head *iter;
901 struct dlm_lock *tmplock;
903 list_for_each(iter, head) {
904 tmplock = list_entry(iter, struct dlm_lock, list);
912 static inline enum dlm_status dlm_err_to_dlm_status(int err)
917 else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
919 else if (err == -EINVAL)
921 else if (err == -ENAMETOOLONG)
929 static inline void dlm_node_iter_init(unsigned long *map,
930 struct dlm_node_iter *iter)
932 memcpy(iter->node_map, map, sizeof(iter->node_map));
936 static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
939 bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
940 if (bit >= O2NM_MAX_NODES) {
941 iter->curnode = O2NM_MAX_NODES;
950 #endif /* DLMCOMMON_H */