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)
58 struct dlm_lock_name
{
60 unsigned char name
[DLM_LOCKID_NAME_MAX
];
63 struct dlm_master_list_entry
{
64 struct list_head list
;
65 struct list_head hb_events
;
72 unsigned long maybe_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
73 unsigned long vote_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
74 unsigned long response_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
75 unsigned long node_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
78 enum dlm_mle_type type
;
79 struct o2hb_callback_func mle_hb_up
;
80 struct o2hb_callback_func mle_hb_down
;
82 struct dlm_lock_resource
*mleres
;
83 struct dlm_lock_name mlename
;
94 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
95 LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
96 LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
98 #define DLM_RECOVERY_LOCK_NAME "$RECOVERY"
99 #define DLM_RECOVERY_LOCK_NAME_LEN 9
101 static inline int dlm_is_recovery_lock(const char *lock_name
, int name_len
)
103 if (name_len
== DLM_RECOVERY_LOCK_NAME_LEN
&&
104 memcmp(lock_name
, DLM_RECOVERY_LOCK_NAME
, name_len
)==0)
109 #define DLM_RECO_STATE_ACTIVE 0x0001
110 #define DLM_RECO_STATE_FINALIZE 0x0002
112 struct dlm_recovery_ctxt
114 struct list_head resources
;
115 struct list_head received
;
116 struct list_head node_data
;
120 unsigned long node_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
121 wait_queue_head_t event
;
124 enum dlm_ctxt_state
{
127 DLM_CTXT_IN_SHUTDOWN
,
133 struct list_head list
;
134 struct hlist_head
**lockres_hash
;
135 struct list_head dirty_list
;
136 struct list_head purge_list
;
137 struct list_head pending_asts
;
138 struct list_head pending_basts
;
139 struct list_head tracking_list
;
140 unsigned int purge_count
;
143 spinlock_t track_lock
;
148 wait_queue_head_t dlm_join_events
;
149 unsigned long live_nodes_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
150 unsigned long domain_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
151 unsigned long recovery_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
152 struct dlm_recovery_ctxt reco
;
153 spinlock_t master_lock
;
154 struct hlist_head
**master_hash
;
155 struct list_head master_list
;
156 struct list_head mle_hb_events
;
158 /* these give a really vague idea of the system load */
159 atomic_t local_resources
;
160 atomic_t remote_resources
;
161 atomic_t unknown_resources
;
163 struct dlm_debug_ctxt
*dlm_debug_ctxt
;
164 struct dentry
*dlm_debugfs_subroot
;
166 /* NOTE: Next three are protected by dlm_domain_lock */
167 struct kref dlm_refs
;
168 enum dlm_ctxt_state dlm_state
;
169 unsigned int num_joins
;
171 struct o2hb_callback_func dlm_hb_up
;
172 struct o2hb_callback_func dlm_hb_down
;
173 struct task_struct
*dlm_thread_task
;
174 struct task_struct
*dlm_reco_thread_task
;
175 struct workqueue_struct
*dlm_worker
;
176 wait_queue_head_t dlm_thread_wq
;
177 wait_queue_head_t dlm_reco_thread_wq
;
178 wait_queue_head_t ast_wq
;
179 wait_queue_head_t migration_wq
;
181 struct work_struct dispatched_work
;
182 struct list_head work_list
;
183 spinlock_t work_lock
;
184 struct list_head dlm_domain_handlers
;
185 struct list_head dlm_eviction_callbacks
;
187 /* The filesystem specifies this at domain registration. We
188 * cache it here to know what to tell other nodes. */
189 struct dlm_protocol_version fs_locking_proto
;
190 /* This is the inter-dlm communication version */
191 struct dlm_protocol_version dlm_locking_proto
;
194 static inline struct hlist_head
*dlm_lockres_hash(struct dlm_ctxt
*dlm
, unsigned i
)
196 return dlm
->lockres_hash
[(i
/ DLM_BUCKETS_PER_PAGE
) % DLM_HASH_PAGES
] + (i
% DLM_BUCKETS_PER_PAGE
);
199 static inline struct hlist_head
*dlm_master_hash(struct dlm_ctxt
*dlm
,
202 return dlm
->master_hash
[(i
/ DLM_BUCKETS_PER_PAGE
) % DLM_HASH_PAGES
] +
203 (i
% DLM_BUCKETS_PER_PAGE
);
206 /* these keventd work queue items are for less-frequently
207 * called functions that cannot be directly called from the
208 * net message handlers for some reason, usually because
209 * they need to send net messages of their own. */
210 void dlm_dispatch_work(struct work_struct
*work
);
212 struct dlm_lock_resource
;
213 struct dlm_work_item
;
215 typedef void (dlm_workfunc_t
)(struct dlm_work_item
*, void *);
217 struct dlm_request_all_locks_priv
223 struct dlm_mig_lockres_priv
225 struct dlm_lock_resource
*lockres
;
230 struct dlm_assert_master_priv
232 struct dlm_lock_resource
*lockres
;
235 unsigned ignore_higher
:1;
238 struct dlm_deref_lockres_priv
240 struct dlm_lock_resource
*deref_res
;
246 struct list_head list
;
247 dlm_workfunc_t
*func
;
248 struct dlm_ctxt
*dlm
;
251 struct dlm_request_all_locks_priv ral
;
252 struct dlm_mig_lockres_priv ml
;
253 struct dlm_assert_master_priv am
;
254 struct dlm_deref_lockres_priv dl
;
258 static inline void dlm_init_work_item(struct dlm_ctxt
*dlm
,
259 struct dlm_work_item
*i
,
260 dlm_workfunc_t
*f
, void *data
)
262 memset(i
, 0, sizeof(*i
));
264 INIT_LIST_HEAD(&i
->list
);
266 i
->dlm
= dlm
; /* must have already done a dlm_grab on this! */
271 static inline void __dlm_set_joining_node(struct dlm_ctxt
*dlm
,
274 assert_spin_locked(&dlm
->spinlock
);
276 dlm
->joining_node
= node
;
277 wake_up(&dlm
->dlm_join_events
);
280 #define DLM_LOCK_RES_UNINITED 0x00000001
281 #define DLM_LOCK_RES_RECOVERING 0x00000002
282 #define DLM_LOCK_RES_READY 0x00000004
283 #define DLM_LOCK_RES_DIRTY 0x00000008
284 #define DLM_LOCK_RES_IN_PROGRESS 0x00000010
285 #define DLM_LOCK_RES_MIGRATING 0x00000020
286 #define DLM_LOCK_RES_DROPPING_REF 0x00000040
287 #define DLM_LOCK_RES_BLOCK_DIRTY 0x00001000
288 #define DLM_LOCK_RES_SETREF_INPROG 0x00002000
290 /* max milliseconds to wait to sync up a network failure with a node death */
291 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
293 #define DLM_PURGE_INTERVAL_MS (8 * 1000)
295 struct dlm_lock_resource
297 /* WARNING: Please see the comment in dlm_init_lockres before
298 * adding fields here. */
299 struct hlist_node hash_node
;
300 struct qstr lockname
;
304 * Please keep granted, converting, and blocked in this order,
305 * as some funcs want to iterate over all lists.
307 * All four lists are protected by the hash's reference.
309 struct list_head granted
;
310 struct list_head converting
;
311 struct list_head blocked
;
312 struct list_head purge
;
315 * These two lists require you to hold an additional reference
316 * while they are on the list.
318 struct list_head dirty
;
319 struct list_head recovering
; // dlm_recovery_ctxt.resources list
321 /* Added during init and removed during release */
322 struct list_head tracking
; /* dlm->tracking_list */
324 /* unused lock resources have their last_used stamped and are
325 * put on a list for the dlm thread to run. */
326 unsigned long last_used
;
328 struct dlm_ctxt
*dlm
;
330 unsigned migration_pending
:1;
331 atomic_t asts_reserved
;
333 wait_queue_head_t wq
;
334 u8 owner
; //node which owns the lock resource, or unknown
336 char lvb
[DLM_LVB_LEN
];
337 unsigned int inflight_locks
;
338 unsigned long refmap
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
341 struct dlm_migratable_lock
345 /* these 3 are just padding for the in-memory structure, but
346 * list and flags are actually used when sent over the wire */
348 u8 list
; // 0=granted, 1=converting, 2=blocked
359 struct dlm_migratable_lock ml
;
361 struct list_head list
;
362 struct list_head ast_list
;
363 struct list_head bast_list
;
364 struct dlm_lock_resource
*lockres
;
366 struct kref lock_refs
;
368 // ast and bast must be callable while holding a spinlock!
369 dlm_astlockfunc_t
*ast
;
370 dlm_bastlockfunc_t
*bast
;
372 struct dlm_lockstatus
*lksb
;
373 unsigned ast_pending
:1,
379 lksb_kernel_allocated
:1;
383 #define DLM_LKSB_UNUSED1 0x01
384 #define DLM_LKSB_PUT_LVB 0x02
385 #define DLM_LKSB_GET_LVB 0x04
386 #define DLM_LKSB_UNUSED2 0x08
387 #define DLM_LKSB_UNUSED3 0x10
388 #define DLM_LKSB_UNUSED4 0x20
389 #define DLM_LKSB_UNUSED5 0x40
390 #define DLM_LKSB_UNUSED6 0x80
393 enum dlm_lockres_list
{
394 DLM_GRANTED_LIST
= 0,
399 static inline int dlm_lvb_is_empty(char *lvb
)
402 for (i
=0; i
<DLM_LVB_LEN
; i
++)
408 static inline struct list_head
*
409 dlm_list_idx_to_ptr(struct dlm_lock_resource
*res
, enum dlm_lockres_list idx
)
411 struct list_head
*ret
= NULL
;
412 if (idx
== DLM_GRANTED_LIST
)
414 else if (idx
== DLM_CONVERTING_LIST
)
415 ret
= &res
->converting
;
416 else if (idx
== DLM_BLOCKED_LIST
)
428 unsigned long node_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
434 DLM_MASTER_REQUEST_MSG
= 500,
435 DLM_UNUSED_MSG1
, /* 501 */
436 DLM_ASSERT_MASTER_MSG
, /* 502 */
437 DLM_CREATE_LOCK_MSG
, /* 503 */
438 DLM_CONVERT_LOCK_MSG
, /* 504 */
439 DLM_PROXY_AST_MSG
, /* 505 */
440 DLM_UNLOCK_LOCK_MSG
, /* 506 */
441 DLM_DEREF_LOCKRES_MSG
, /* 507 */
442 DLM_MIGRATE_REQUEST_MSG
, /* 508 */
443 DLM_MIG_LOCKRES_MSG
, /* 509 */
444 DLM_QUERY_JOIN_MSG
, /* 510 */
445 DLM_ASSERT_JOINED_MSG
, /* 511 */
446 DLM_CANCEL_JOIN_MSG
, /* 512 */
447 DLM_EXIT_DOMAIN_MSG
, /* 513 */
448 DLM_MASTER_REQUERY_MSG
, /* 514 */
449 DLM_LOCK_REQUEST_MSG
, /* 515 */
450 DLM_RECO_DATA_DONE_MSG
, /* 516 */
451 DLM_BEGIN_RECO_MSG
, /* 517 */
452 DLM_FINALIZE_RECO_MSG
/* 518 */
455 struct dlm_reco_node_data
459 struct list_head list
;
463 DLM_RECO_NODE_DATA_DEAD
= -1,
464 DLM_RECO_NODE_DATA_INIT
= 0,
465 DLM_RECO_NODE_DATA_REQUESTING
,
466 DLM_RECO_NODE_DATA_REQUESTED
,
467 DLM_RECO_NODE_DATA_RECEIVING
,
468 DLM_RECO_NODE_DATA_DONE
,
469 DLM_RECO_NODE_DATA_FINALIZE_SENT
,
474 DLM_MASTER_RESP_NO
= 0,
476 DLM_MASTER_RESP_MAYBE
,
477 DLM_MASTER_RESP_ERROR
481 struct dlm_master_request
488 u8 name
[O2NM_MAX_NAME_LEN
];
491 #define DLM_ASSERT_RESPONSE_REASSERT 0x00000001
492 #define DLM_ASSERT_RESPONSE_MASTERY_REF 0x00000002
494 #define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
495 #define DLM_ASSERT_MASTER_REQUERY 0x00000002
496 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
497 struct dlm_assert_master
504 u8 name
[O2NM_MAX_NAME_LEN
];
507 #define DLM_MIGRATE_RESPONSE_MASTERY_REF 0x00000001
509 struct dlm_migrate_request
516 u8 name
[O2NM_MAX_NAME_LEN
];
519 struct dlm_master_requery
526 u8 name
[O2NM_MAX_NAME_LEN
];
529 #define DLM_MRES_RECOVERY 0x01
530 #define DLM_MRES_MIGRATION 0x02
531 #define DLM_MRES_ALL_DONE 0x04
534 * We would like to get one whole lockres into a single network
535 * message whenever possible. Generally speaking, there will be
536 * at most one dlm_lock on a lockres for each node in the cluster,
537 * plus (infrequently) any additional locks coming in from userdlm.
539 * struct _dlm_lockres_page
541 * dlm_migratable_lockres mres;
542 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
543 * u8 pad[DLM_MIG_LOCKRES_RESERVED];
546 * from ../cluster/tcp.h
547 * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
548 * (roughly 4080 bytes)
549 * and sizeof(dlm_migratable_lockres) = 112 bytes
550 * and sizeof(dlm_migratable_lock) = 16 bytes
552 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
553 * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
555 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
556 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
557 * NET_MAX_PAYLOAD_BYTES
558 * (240 * 16) + 112 + 128 = 4080
560 * So a lockres would need more than 240 locks before it would
561 * use more than one network packet to recover. Not too bad.
563 #define DLM_MAX_MIGRATABLE_LOCKS 240
565 struct dlm_migratable_lockres
569 u8 num_locks
; // locks sent in this structure
571 __be32 total_locks
; // locks to be sent for this migration cookie
572 __be64 mig_cookie
; // cookie for this lockres migration
573 // or zero if not needed
575 u8 lockname
[DLM_LOCKID_NAME_MAX
];
579 struct dlm_migratable_lock ml
[0]; // 16 bytes each, begins at byte 112
581 #define DLM_MIG_LOCKRES_MAX_LEN \
582 (sizeof(struct dlm_migratable_lockres) + \
583 (sizeof(struct dlm_migratable_lock) * \
584 DLM_MAX_MIGRATABLE_LOCKS) )
586 /* from above, 128 bytes
587 * for some undetermined future use */
588 #define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \
589 DLM_MIG_LOCKRES_MAX_LEN)
591 struct dlm_create_lock
601 u8 name
[O2NM_MAX_NAME_LEN
];
604 struct dlm_convert_lock
614 u8 name
[O2NM_MAX_NAME_LEN
];
618 #define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
620 struct dlm_unlock_lock
629 u8 name
[O2NM_MAX_NAME_LEN
];
633 #define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
645 u8 name
[O2NM_MAX_NAME_LEN
];
649 #define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
651 #define DLM_MOD_KEY (0x666c6172)
652 enum dlm_query_join_response_code
{
656 JOIN_PROTOCOL_MISMATCH
,
659 struct dlm_query_join_packet
{
660 u8 code
; /* Response code. dlm_minor and fs_minor
661 are only valid if this is JOIN_OK */
662 u8 dlm_minor
; /* The minor version of the protocol the
664 u8 fs_minor
; /* The minor version of the protocol the
665 filesystem is speaking. */
669 union dlm_query_join_response
{
671 struct dlm_query_join_packet packet
;
674 struct dlm_lock_request
682 struct dlm_reco_data_done
690 /* eventually we can use this to attempt
691 * lvb recovery based on each node's info */
692 u8 reco_lvb
[DLM_LVB_LEN
];
695 struct dlm_begin_reco
704 #define BITS_PER_BYTE 8
705 #define BITS_TO_BYTES(bits) (((bits)+BITS_PER_BYTE-1)/BITS_PER_BYTE)
707 struct dlm_query_join_request
712 struct dlm_protocol_version dlm_proto
;
713 struct dlm_protocol_version fs_proto
;
714 u8 domain
[O2NM_MAX_NAME_LEN
];
715 u8 node_map
[BITS_TO_BYTES(O2NM_MAX_NODES
)];
718 struct dlm_assert_joined
723 u8 domain
[O2NM_MAX_NAME_LEN
];
726 struct dlm_cancel_join
731 u8 domain
[O2NM_MAX_NAME_LEN
];
734 struct dlm_exit_domain
740 struct dlm_finalize_reco
749 struct dlm_deref_lockres
756 u8 name
[O2NM_MAX_NAME_LEN
];
759 static inline enum dlm_status
760 __dlm_lockres_state_to_status(struct dlm_lock_resource
*res
)
762 enum dlm_status status
= DLM_NORMAL
;
764 assert_spin_locked(&res
->spinlock
);
766 if (res
->state
& DLM_LOCK_RES_RECOVERING
)
767 status
= DLM_RECOVERING
;
768 else if (res
->state
& DLM_LOCK_RES_MIGRATING
)
769 status
= DLM_MIGRATING
;
770 else if (res
->state
& DLM_LOCK_RES_IN_PROGRESS
)
771 status
= DLM_FORWARD
;
776 static inline u8
dlm_get_lock_cookie_node(u64 cookie
)
780 ret
= (u8
)(cookie
& 0xffULL
);
784 static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie
)
786 unsigned long long ret
;
787 ret
= ((unsigned long long)cookie
) & 0x00ffffffffffffffULL
;
791 struct dlm_lock
* dlm_new_lock(int type
, u8 node
, u64 cookie
,
792 struct dlm_lockstatus
*lksb
);
793 void dlm_lock_get(struct dlm_lock
*lock
);
794 void dlm_lock_put(struct dlm_lock
*lock
);
796 void dlm_lock_attach_lockres(struct dlm_lock
*lock
,
797 struct dlm_lock_resource
*res
);
799 int dlm_create_lock_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
801 int dlm_convert_lock_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
803 int dlm_proxy_ast_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
806 void dlm_revert_pending_convert(struct dlm_lock_resource
*res
,
807 struct dlm_lock
*lock
);
808 void dlm_revert_pending_lock(struct dlm_lock_resource
*res
,
809 struct dlm_lock
*lock
);
811 int dlm_unlock_lock_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
813 void dlm_commit_pending_cancel(struct dlm_lock_resource
*res
,
814 struct dlm_lock
*lock
);
815 void dlm_commit_pending_unlock(struct dlm_lock_resource
*res
,
816 struct dlm_lock
*lock
);
818 int dlm_launch_thread(struct dlm_ctxt
*dlm
);
819 void dlm_complete_thread(struct dlm_ctxt
*dlm
);
820 int dlm_launch_recovery_thread(struct dlm_ctxt
*dlm
);
821 void dlm_complete_recovery_thread(struct dlm_ctxt
*dlm
);
822 void dlm_wait_for_recovery(struct dlm_ctxt
*dlm
);
823 void dlm_kick_recovery_thread(struct dlm_ctxt
*dlm
);
824 int dlm_is_node_dead(struct dlm_ctxt
*dlm
, u8 node
);
825 int dlm_wait_for_node_death(struct dlm_ctxt
*dlm
, u8 node
, int timeout
);
826 int dlm_wait_for_node_recovery(struct dlm_ctxt
*dlm
, u8 node
, int timeout
);
828 void dlm_put(struct dlm_ctxt
*dlm
);
829 struct dlm_ctxt
*dlm_grab(struct dlm_ctxt
*dlm
);
830 int dlm_domain_fully_joined(struct dlm_ctxt
*dlm
);
832 void __dlm_lockres_calc_usage(struct dlm_ctxt
*dlm
,
833 struct dlm_lock_resource
*res
);
834 void dlm_lockres_calc_usage(struct dlm_ctxt
*dlm
,
835 struct dlm_lock_resource
*res
);
836 static inline void dlm_lockres_get(struct dlm_lock_resource
*res
)
838 /* This is called on every lookup, so it might be worth
840 kref_get(&res
->refs
);
842 void dlm_lockres_put(struct dlm_lock_resource
*res
);
843 void __dlm_unhash_lockres(struct dlm_lock_resource
*res
);
844 void __dlm_insert_lockres(struct dlm_ctxt
*dlm
,
845 struct dlm_lock_resource
*res
);
846 struct dlm_lock_resource
* __dlm_lookup_lockres_full(struct dlm_ctxt
*dlm
,
850 struct dlm_lock_resource
* __dlm_lookup_lockres(struct dlm_ctxt
*dlm
,
854 struct dlm_lock_resource
* dlm_lookup_lockres(struct dlm_ctxt
*dlm
,
858 int dlm_is_host_down(int errno
);
859 void dlm_change_lockres_owner(struct dlm_ctxt
*dlm
,
860 struct dlm_lock_resource
*res
,
862 struct dlm_lock_resource
* dlm_get_lock_resource(struct dlm_ctxt
*dlm
,
866 struct dlm_lock_resource
*dlm_new_lockres(struct dlm_ctxt
*dlm
,
868 unsigned int namelen
);
870 #define dlm_lockres_set_refmap_bit(bit,res) \
871 __dlm_lockres_set_refmap_bit(bit,res,__FILE__,__LINE__)
872 #define dlm_lockres_clear_refmap_bit(bit,res) \
873 __dlm_lockres_clear_refmap_bit(bit,res,__FILE__,__LINE__)
875 static inline void __dlm_lockres_set_refmap_bit(int bit
,
876 struct dlm_lock_resource
*res
,
880 //printk("%s:%d:%.*s: setting bit %d\n", file, line,
881 // res->lockname.len, res->lockname.name, bit);
882 set_bit(bit
, res
->refmap
);
885 static inline void __dlm_lockres_clear_refmap_bit(int bit
,
886 struct dlm_lock_resource
*res
,
890 //printk("%s:%d:%.*s: clearing bit %d\n", file, line,
891 // res->lockname.len, res->lockname.name, bit);
892 clear_bit(bit
, res
->refmap
);
895 void __dlm_lockres_drop_inflight_ref(struct dlm_ctxt
*dlm
,
896 struct dlm_lock_resource
*res
,
899 void __dlm_lockres_grab_inflight_ref(struct dlm_ctxt
*dlm
,
900 struct dlm_lock_resource
*res
,
904 #define dlm_lockres_drop_inflight_ref(d,r) \
905 __dlm_lockres_drop_inflight_ref(d,r,__FILE__,__LINE__)
906 #define dlm_lockres_grab_inflight_ref(d,r) \
907 __dlm_lockres_grab_inflight_ref(d,r,0,__FILE__,__LINE__)
908 #define dlm_lockres_grab_inflight_ref_new(d,r) \
909 __dlm_lockres_grab_inflight_ref(d,r,1,__FILE__,__LINE__)
911 void dlm_queue_ast(struct dlm_ctxt
*dlm
, struct dlm_lock
*lock
);
912 void dlm_queue_bast(struct dlm_ctxt
*dlm
, struct dlm_lock
*lock
);
913 void dlm_do_local_ast(struct dlm_ctxt
*dlm
,
914 struct dlm_lock_resource
*res
,
915 struct dlm_lock
*lock
);
916 int dlm_do_remote_ast(struct dlm_ctxt
*dlm
,
917 struct dlm_lock_resource
*res
,
918 struct dlm_lock
*lock
);
919 void dlm_do_local_bast(struct dlm_ctxt
*dlm
,
920 struct dlm_lock_resource
*res
,
921 struct dlm_lock
*lock
,
923 int dlm_send_proxy_ast_msg(struct dlm_ctxt
*dlm
,
924 struct dlm_lock_resource
*res
,
925 struct dlm_lock
*lock
,
927 int blocked_type
, int flags
);
928 static inline int dlm_send_proxy_bast(struct dlm_ctxt
*dlm
,
929 struct dlm_lock_resource
*res
,
930 struct dlm_lock
*lock
,
933 return dlm_send_proxy_ast_msg(dlm
, res
, lock
, DLM_BAST
,
937 static inline int dlm_send_proxy_ast(struct dlm_ctxt
*dlm
,
938 struct dlm_lock_resource
*res
,
939 struct dlm_lock
*lock
,
942 return dlm_send_proxy_ast_msg(dlm
, res
, lock
, DLM_AST
,
946 void dlm_print_one_lock_resource(struct dlm_lock_resource
*res
);
947 void __dlm_print_one_lock_resource(struct dlm_lock_resource
*res
);
949 u8
dlm_nm_this_node(struct dlm_ctxt
*dlm
);
950 void dlm_kick_thread(struct dlm_ctxt
*dlm
, struct dlm_lock_resource
*res
);
951 void __dlm_dirty_lockres(struct dlm_ctxt
*dlm
, struct dlm_lock_resource
*res
);
954 int dlm_nm_init(struct dlm_ctxt
*dlm
);
955 int dlm_heartbeat_init(struct dlm_ctxt
*dlm
);
956 void dlm_hb_node_down_cb(struct o2nm_node
*node
, int idx
, void *data
);
957 void dlm_hb_node_up_cb(struct o2nm_node
*node
, int idx
, void *data
);
959 int dlm_empty_lockres(struct dlm_ctxt
*dlm
, struct dlm_lock_resource
*res
);
960 int dlm_finish_migration(struct dlm_ctxt
*dlm
,
961 struct dlm_lock_resource
*res
,
963 void dlm_lockres_release_ast(struct dlm_ctxt
*dlm
,
964 struct dlm_lock_resource
*res
);
965 void __dlm_lockres_reserve_ast(struct dlm_lock_resource
*res
);
967 int dlm_master_request_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
969 int dlm_assert_master_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
971 void dlm_assert_master_post_handler(int status
, void *data
, void *ret_data
);
972 int dlm_deref_lockres_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
974 int dlm_migrate_request_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
976 int dlm_mig_lockres_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
978 int dlm_master_requery_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
980 int dlm_request_all_locks_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
982 int dlm_reco_data_done_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
984 int dlm_begin_reco_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
986 int dlm_finalize_reco_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
988 int dlm_do_master_requery(struct dlm_ctxt
*dlm
, struct dlm_lock_resource
*res
,
989 u8 nodenum
, u8
*real_master
);
992 int dlm_dispatch_assert_master(struct dlm_ctxt
*dlm
,
993 struct dlm_lock_resource
*res
,
999 int dlm_send_one_lockres(struct dlm_ctxt
*dlm
,
1000 struct dlm_lock_resource
*res
,
1001 struct dlm_migratable_lockres
*mres
,
1004 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt
*dlm
,
1005 struct dlm_lock_resource
*res
);
1007 /* will exit holding res->spinlock, but may drop in function */
1008 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource
*res
, int flags
);
1009 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource
*res
, int flags
);
1011 /* will exit holding res->spinlock, but may drop in function */
1012 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource
*res
)
1014 __dlm_wait_on_lockres_flags(res
, (DLM_LOCK_RES_IN_PROGRESS
|
1015 DLM_LOCK_RES_RECOVERING
|
1016 DLM_LOCK_RES_MIGRATING
));
1019 void __dlm_unlink_mle(struct dlm_ctxt
*dlm
, struct dlm_master_list_entry
*mle
);
1020 void __dlm_insert_mle(struct dlm_ctxt
*dlm
, struct dlm_master_list_entry
*mle
);
1022 /* create/destroy slab caches */
1023 int dlm_init_master_caches(void);
1024 void dlm_destroy_master_caches(void);
1026 int dlm_init_lock_cache(void);
1027 void dlm_destroy_lock_cache(void);
1029 int dlm_init_mle_cache(void);
1030 void dlm_destroy_mle_cache(void);
1032 void dlm_hb_event_notify_attached(struct dlm_ctxt
*dlm
, int idx
, int node_up
);
1033 int dlm_drop_lockres_ref(struct dlm_ctxt
*dlm
,
1034 struct dlm_lock_resource
*res
);
1035 void dlm_clean_master_list(struct dlm_ctxt
*dlm
,
1037 int dlm_lock_basts_flushed(struct dlm_ctxt
*dlm
, struct dlm_lock
*lock
);
1038 int __dlm_lockres_has_locks(struct dlm_lock_resource
*res
);
1039 int __dlm_lockres_unused(struct dlm_lock_resource
*res
);
1041 static inline const char * dlm_lock_mode_name(int mode
)
1055 static inline int dlm_lock_compatible(int existing
, int request
)
1057 /* NO_LOCK compatible with all */
1058 if (request
== LKM_NLMODE
||
1059 existing
== LKM_NLMODE
)
1062 /* EX incompatible with all non-NO_LOCK */
1063 if (request
== LKM_EXMODE
)
1066 /* request must be PR, which is compatible with PR */
1067 if (existing
== LKM_PRMODE
)
1073 static inline int dlm_lock_on_list(struct list_head
*head
,
1074 struct dlm_lock
*lock
)
1076 struct list_head
*iter
;
1077 struct dlm_lock
*tmplock
;
1079 list_for_each(iter
, head
) {
1080 tmplock
= list_entry(iter
, struct dlm_lock
, list
);
1081 if (tmplock
== lock
)
1088 static inline enum dlm_status
dlm_err_to_dlm_status(int err
)
1090 enum dlm_status ret
;
1093 else if (err
== -ETIMEDOUT
|| o2net_link_down(err
, NULL
))
1094 ret
= DLM_NOLOCKMGR
;
1095 else if (err
== -EINVAL
)
1097 else if (err
== -ENAMETOOLONG
)
1105 static inline void dlm_node_iter_init(unsigned long *map
,
1106 struct dlm_node_iter
*iter
)
1108 memcpy(iter
->node_map
, map
, sizeof(iter
->node_map
));
1112 static inline int dlm_node_iter_next(struct dlm_node_iter
*iter
)
1115 bit
= find_next_bit(iter
->node_map
, O2NM_MAX_NODES
, iter
->curnode
+1);
1116 if (bit
>= O2NM_MAX_NODES
) {
1117 iter
->curnode
= O2NM_MAX_NODES
;
1120 iter
->curnode
= bit
;
1126 #endif /* DLMCOMMON_H */