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_BUCKETS (PAGE_SIZE / sizeof(struct hlist_head))
49 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
50 LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
51 LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
53 #define DLM_RECOVERY_LOCK_NAME "$RECOVERY"
54 #define DLM_RECOVERY_LOCK_NAME_LEN 9
56 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
58 if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
59 memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
64 #define DLM_RECO_STATE_ACTIVE 0x0001
66 struct dlm_recovery_ctxt
68 struct list_head resources;
69 struct list_head received;
70 struct list_head node_data;
74 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
75 wait_queue_head_t event;
87 struct list_head list;
88 struct hlist_head *lockres_hash;
89 struct list_head dirty_list;
90 struct list_head purge_list;
91 struct list_head pending_asts;
92 struct list_head pending_basts;
93 unsigned int purge_count;
100 wait_queue_head_t dlm_join_events;
101 unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
102 unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
103 unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
104 struct dlm_recovery_ctxt reco;
105 spinlock_t master_lock;
106 struct list_head master_list;
107 struct list_head mle_hb_events;
109 /* these give a really vague idea of the system load */
110 atomic_t local_resources;
111 atomic_t remote_resources;
112 atomic_t unknown_resources;
114 /* NOTE: Next three are protected by dlm_domain_lock */
115 struct kref dlm_refs;
116 enum dlm_ctxt_state dlm_state;
117 unsigned int num_joins;
119 struct o2hb_callback_func dlm_hb_up;
120 struct o2hb_callback_func dlm_hb_down;
121 struct task_struct *dlm_thread_task;
122 struct task_struct *dlm_reco_thread_task;
123 wait_queue_head_t dlm_thread_wq;
124 wait_queue_head_t dlm_reco_thread_wq;
125 wait_queue_head_t ast_wq;
126 wait_queue_head_t migration_wq;
128 struct work_struct dispatched_work;
129 struct list_head work_list;
130 spinlock_t work_lock;
131 struct list_head dlm_domain_handlers;
132 struct list_head dlm_eviction_callbacks;
135 /* these keventd work queue items are for less-frequently
136 * called functions that cannot be directly called from the
137 * net message handlers for some reason, usually because
138 * they need to send net messages of their own. */
139 void dlm_dispatch_work(void *data);
141 struct dlm_lock_resource;
142 struct dlm_work_item;
144 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
146 struct dlm_request_all_locks_priv
152 struct dlm_mig_lockres_priv
154 struct dlm_lock_resource *lockres;
158 struct dlm_assert_master_priv
160 struct dlm_lock_resource *lockres;
163 unsigned ignore_higher:1;
169 struct list_head list;
170 dlm_workfunc_t *func;
171 struct dlm_ctxt *dlm;
174 struct dlm_request_all_locks_priv ral;
175 struct dlm_mig_lockres_priv ml;
176 struct dlm_assert_master_priv am;
180 static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
181 struct dlm_work_item *i,
182 dlm_workfunc_t *f, void *data)
184 memset(i, 0, sizeof(*i));
186 INIT_LIST_HEAD(&i->list);
188 i->dlm = dlm; /* must have already done a dlm_grab on this! */
193 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
196 assert_spin_locked(&dlm->spinlock);
198 dlm->joining_node = node;
199 wake_up(&dlm->dlm_join_events);
202 #define DLM_LOCK_RES_UNINITED 0x00000001
203 #define DLM_LOCK_RES_RECOVERING 0x00000002
204 #define DLM_LOCK_RES_READY 0x00000004
205 #define DLM_LOCK_RES_DIRTY 0x00000008
206 #define DLM_LOCK_RES_IN_PROGRESS 0x00000010
207 #define DLM_LOCK_RES_MIGRATING 0x00000020
209 /* max milliseconds to wait to sync up a network failure with a node death */
210 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
212 #define DLM_PURGE_INTERVAL_MS (8 * 1000)
214 struct dlm_lock_resource
216 /* WARNING: Please see the comment in dlm_init_lockres before
217 * adding fields here. */
218 struct hlist_node hash_node;
221 /* please keep these next 3 in this order
222 * some funcs want to iterate over all lists */
223 struct list_head granted;
224 struct list_head converting;
225 struct list_head blocked;
227 struct list_head dirty;
228 struct list_head recovering; // dlm_recovery_ctxt.resources list
230 /* unused lock resources have their last_used stamped and are
231 * put on a list for the dlm thread to run. */
232 struct list_head purge;
233 unsigned long last_used;
235 unsigned migration_pending:1;
236 atomic_t asts_reserved;
238 wait_queue_head_t wq;
239 u8 owner; //node which owns the lock resource, or unknown
241 struct qstr lockname;
242 char lvb[DLM_LVB_LEN];
245 struct dlm_migratable_lock
249 /* these 3 are just padding for the in-memory structure, but
250 * list and flags are actually used when sent over the wire */
252 u8 list; // 0=granted, 1=converting, 2=blocked
263 struct dlm_migratable_lock ml;
265 struct list_head list;
266 struct list_head ast_list;
267 struct list_head bast_list;
268 struct dlm_lock_resource *lockres;
270 struct kref lock_refs;
272 // ast and bast must be callable while holding a spinlock!
273 dlm_astlockfunc_t *ast;
274 dlm_bastlockfunc_t *bast;
276 struct dlm_lockstatus *lksb;
277 unsigned ast_pending:1,
283 lksb_kernel_allocated:1;
287 #define DLM_LKSB_UNUSED1 0x01
288 #define DLM_LKSB_PUT_LVB 0x02
289 #define DLM_LKSB_GET_LVB 0x04
290 #define DLM_LKSB_UNUSED2 0x08
291 #define DLM_LKSB_UNUSED3 0x10
292 #define DLM_LKSB_UNUSED4 0x20
293 #define DLM_LKSB_UNUSED5 0x40
294 #define DLM_LKSB_UNUSED6 0x80
297 enum dlm_lockres_list {
298 DLM_GRANTED_LIST = 0,
303 static inline struct list_head *
304 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
306 struct list_head *ret = NULL;
307 if (idx == DLM_GRANTED_LIST)
309 else if (idx == DLM_CONVERTING_LIST)
310 ret = &res->converting;
311 else if (idx == DLM_BLOCKED_LIST)
323 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
329 DLM_MASTER_REQUEST_MSG = 500,
330 DLM_UNUSED_MSG1, /* 501 */
331 DLM_ASSERT_MASTER_MSG, /* 502 */
332 DLM_CREATE_LOCK_MSG, /* 503 */
333 DLM_CONVERT_LOCK_MSG, /* 504 */
334 DLM_PROXY_AST_MSG, /* 505 */
335 DLM_UNLOCK_LOCK_MSG, /* 506 */
336 DLM_UNUSED_MSG2, /* 507 */
337 DLM_MIGRATE_REQUEST_MSG, /* 508 */
338 DLM_MIG_LOCKRES_MSG, /* 509 */
339 DLM_QUERY_JOIN_MSG, /* 510 */
340 DLM_ASSERT_JOINED_MSG, /* 511 */
341 DLM_CANCEL_JOIN_MSG, /* 512 */
342 DLM_EXIT_DOMAIN_MSG, /* 513 */
343 DLM_MASTER_REQUERY_MSG, /* 514 */
344 DLM_LOCK_REQUEST_MSG, /* 515 */
345 DLM_RECO_DATA_DONE_MSG, /* 516 */
346 DLM_BEGIN_RECO_MSG, /* 517 */
347 DLM_FINALIZE_RECO_MSG /* 518 */
350 struct dlm_reco_node_data
354 struct list_head list;
358 DLM_RECO_NODE_DATA_DEAD = -1,
359 DLM_RECO_NODE_DATA_INIT = 0,
360 DLM_RECO_NODE_DATA_REQUESTING,
361 DLM_RECO_NODE_DATA_REQUESTED,
362 DLM_RECO_NODE_DATA_RECEIVING,
363 DLM_RECO_NODE_DATA_DONE,
364 DLM_RECO_NODE_DATA_FINALIZE_SENT,
369 DLM_MASTER_RESP_NO = 0,
371 DLM_MASTER_RESP_MAYBE,
372 DLM_MASTER_RESP_ERROR
376 struct dlm_master_request
383 u8 name[O2NM_MAX_NAME_LEN];
386 #define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
387 #define DLM_ASSERT_MASTER_REQUERY 0x00000002
388 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
389 struct dlm_assert_master
396 u8 name[O2NM_MAX_NAME_LEN];
399 struct dlm_migrate_request
406 u8 name[O2NM_MAX_NAME_LEN];
409 struct dlm_master_requery
416 u8 name[O2NM_MAX_NAME_LEN];
419 #define DLM_MRES_RECOVERY 0x01
420 #define DLM_MRES_MIGRATION 0x02
421 #define DLM_MRES_ALL_DONE 0x04
424 * We would like to get one whole lockres into a single network
425 * message whenever possible. Generally speaking, there will be
426 * at most one dlm_lock on a lockres for each node in the cluster,
427 * plus (infrequently) any additional locks coming in from userdlm.
429 * struct _dlm_lockres_page
431 * dlm_migratable_lockres mres;
432 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
433 * u8 pad[DLM_MIG_LOCKRES_RESERVED];
436 * from ../cluster/tcp.h
437 * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
438 * (roughly 4080 bytes)
439 * and sizeof(dlm_migratable_lockres) = 112 bytes
440 * and sizeof(dlm_migratable_lock) = 16 bytes
442 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
443 * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
445 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
446 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
447 * NET_MAX_PAYLOAD_BYTES
448 * (240 * 16) + 112 + 128 = 4080
450 * So a lockres would need more than 240 locks before it would
451 * use more than one network packet to recover. Not too bad.
453 #define DLM_MAX_MIGRATABLE_LOCKS 240
455 struct dlm_migratable_lockres
459 u8 num_locks; // locks sent in this structure
461 __be32 total_locks; // locks to be sent for this migration cookie
462 __be64 mig_cookie; // cookie for this lockres migration
463 // or zero if not needed
465 u8 lockname[DLM_LOCKID_NAME_MAX];
469 struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112
471 #define DLM_MIG_LOCKRES_MAX_LEN \
472 (sizeof(struct dlm_migratable_lockres) + \
473 (sizeof(struct dlm_migratable_lock) * \
474 DLM_MAX_MIGRATABLE_LOCKS) )
476 /* from above, 128 bytes
477 * for some undetermined future use */
478 #define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \
479 DLM_MIG_LOCKRES_MAX_LEN)
481 struct dlm_create_lock
491 u8 name[O2NM_MAX_NAME_LEN];
494 struct dlm_convert_lock
504 u8 name[O2NM_MAX_NAME_LEN];
508 #define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
510 struct dlm_unlock_lock
519 u8 name[O2NM_MAX_NAME_LEN];
523 #define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
535 u8 name[O2NM_MAX_NAME_LEN];
539 #define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
541 #define DLM_MOD_KEY (0x666c6172)
542 enum dlm_query_join_response {
548 struct dlm_lock_request
556 struct dlm_reco_data_done
564 /* eventually we can use this to attempt
565 * lvb recovery based on each node's info */
566 u8 reco_lvb[DLM_LVB_LEN];
569 struct dlm_begin_reco
578 struct dlm_query_join_request
583 u8 domain[O2NM_MAX_NAME_LEN];
586 struct dlm_assert_joined
591 u8 domain[O2NM_MAX_NAME_LEN];
594 struct dlm_cancel_join
599 u8 domain[O2NM_MAX_NAME_LEN];
602 struct dlm_exit_domain
608 struct dlm_finalize_reco
616 static inline enum dlm_status
617 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
619 enum dlm_status status = DLM_NORMAL;
621 assert_spin_locked(&res->spinlock);
623 if (res->state & DLM_LOCK_RES_RECOVERING)
624 status = DLM_RECOVERING;
625 else if (res->state & DLM_LOCK_RES_MIGRATING)
626 status = DLM_MIGRATING;
627 else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
628 status = DLM_FORWARD;
633 static inline u8 dlm_get_lock_cookie_node(u64 cookie)
637 ret = (u8)(cookie & 0xffULL);
641 static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
643 unsigned long long ret;
644 ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
648 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
649 struct dlm_lockstatus *lksb);
650 void dlm_lock_get(struct dlm_lock *lock);
651 void dlm_lock_put(struct dlm_lock *lock);
653 void dlm_lock_attach_lockres(struct dlm_lock *lock,
654 struct dlm_lock_resource *res);
656 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
657 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
658 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
660 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
661 struct dlm_lock *lock);
662 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
663 struct dlm_lock *lock);
665 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
666 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
667 struct dlm_lock *lock);
668 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
669 struct dlm_lock *lock);
671 int dlm_launch_thread(struct dlm_ctxt *dlm);
672 void dlm_complete_thread(struct dlm_ctxt *dlm);
673 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
674 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
675 void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
676 void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
677 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
678 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
680 void dlm_put(struct dlm_ctxt *dlm);
681 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
682 int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
684 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
685 struct dlm_lock_resource *res);
686 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
687 struct dlm_lock_resource *res);
688 void dlm_purge_lockres(struct dlm_ctxt *dlm,
689 struct dlm_lock_resource *lockres);
690 void dlm_lockres_get(struct dlm_lock_resource *res);
691 void dlm_lockres_put(struct dlm_lock_resource *res);
692 void __dlm_unhash_lockres(struct dlm_lock_resource *res);
693 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
694 struct dlm_lock_resource *res);
695 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
698 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
702 int dlm_is_host_down(int errno);
703 void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
704 struct dlm_lock_resource *res,
706 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
709 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
711 unsigned int namelen);
713 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
714 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
715 void dlm_do_local_ast(struct dlm_ctxt *dlm,
716 struct dlm_lock_resource *res,
717 struct dlm_lock *lock);
718 int dlm_do_remote_ast(struct dlm_ctxt *dlm,
719 struct dlm_lock_resource *res,
720 struct dlm_lock *lock);
721 void dlm_do_local_bast(struct dlm_ctxt *dlm,
722 struct dlm_lock_resource *res,
723 struct dlm_lock *lock,
725 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
726 struct dlm_lock_resource *res,
727 struct dlm_lock *lock,
729 int blocked_type, int flags);
730 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
731 struct dlm_lock_resource *res,
732 struct dlm_lock *lock,
735 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
739 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
740 struct dlm_lock_resource *res,
741 struct dlm_lock *lock,
744 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
748 void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
749 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
751 u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
752 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
753 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
756 int dlm_nm_init(struct dlm_ctxt *dlm);
757 int dlm_heartbeat_init(struct dlm_ctxt *dlm);
758 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
759 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
761 int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
762 int dlm_migrate_lockres(struct dlm_ctxt *dlm,
763 struct dlm_lock_resource *res,
765 int dlm_finish_migration(struct dlm_ctxt *dlm,
766 struct dlm_lock_resource *res,
768 void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
769 struct dlm_lock_resource *res);
770 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
772 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
773 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
774 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
775 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
776 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
777 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
778 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
779 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
780 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
781 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
782 u8 nodenum, u8 *real_master);
783 int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
784 struct dlm_lock_resource *res, u8 *real_master);
787 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
788 struct dlm_lock_resource *res,
794 int dlm_send_one_lockres(struct dlm_ctxt *dlm,
795 struct dlm_lock_resource *res,
796 struct dlm_migratable_lockres *mres,
799 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
800 struct dlm_lock_resource *res);
802 /* will exit holding res->spinlock, but may drop in function */
803 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
804 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
806 /* will exit holding res->spinlock, but may drop in function */
807 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
809 __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
810 DLM_LOCK_RES_RECOVERING|
811 DLM_LOCK_RES_MIGRATING));
815 int dlm_init_mle_cache(void);
816 void dlm_destroy_mle_cache(void);
817 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
818 void dlm_clean_master_list(struct dlm_ctxt *dlm,
820 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
823 static inline const char * dlm_lock_mode_name(int mode)
837 static inline int dlm_lock_compatible(int existing, int request)
839 /* NO_LOCK compatible with all */
840 if (request == LKM_NLMODE ||
841 existing == LKM_NLMODE)
844 /* EX incompatible with all non-NO_LOCK */
845 if (request == LKM_EXMODE)
848 /* request must be PR, which is compatible with PR */
849 if (existing == LKM_PRMODE)
855 static inline int dlm_lock_on_list(struct list_head *head,
856 struct dlm_lock *lock)
858 struct list_head *iter;
859 struct dlm_lock *tmplock;
861 list_for_each(iter, head) {
862 tmplock = list_entry(iter, struct dlm_lock, list);
870 static inline enum dlm_status dlm_err_to_dlm_status(int err)
875 else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
877 else if (err == -EINVAL)
879 else if (err == -ENAMETOOLONG)
887 static inline void dlm_node_iter_init(unsigned long *map,
888 struct dlm_node_iter *iter)
890 memcpy(iter->node_map, map, sizeof(iter->node_map));
894 static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
897 bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
898 if (bit >= O2NM_MAX_NODES) {
899 iter->curnode = O2NM_MAX_NODES;
908 #endif /* DLMCOMMON_H */