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1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * dlmcommon.h
5  *
6  * Copyright (C) 2004 Oracle.  All rights reserved.
7  *
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.
12  *
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.
17  *
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.
22  *
23  */
24
25 #ifndef DLMCOMMON_H
26 #define DLMCOMMON_H
27
28 #include <linux/kref.h>
29
30 #define DLM_HB_NODE_DOWN_PRI     (0xf000000)
31 #define DLM_HB_NODE_UP_PRI       (0x8000000)
32
33 #define DLM_LOCKID_NAME_MAX    32
34
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
39
40 #define DLM_HASH_BITS     7
41 #define DLM_HASH_SIZE     (1 << DLM_HASH_BITS)
42 #define DLM_HASH_MASK     (DLM_HASH_SIZE - 1)
43
44 enum dlm_ast_type {
45         DLM_AST = 0,
46         DLM_BAST,
47         DLM_ASTUNLOCK
48 };
49
50
51 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
52                          LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
53                          LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
54
55 #define DLM_RECOVERY_LOCK_NAME       "$RECOVERY"
56 #define DLM_RECOVERY_LOCK_NAME_LEN   9
57
58 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
59 {
60         if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
61             memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
62                 return 1;
63         return 0;
64 }
65
66 #define DLM_RECO_STATE_ACTIVE  0x0001
67
68 struct dlm_recovery_ctxt
69 {
70         struct list_head resources;
71         struct list_head received;
72         struct list_head node_data;
73         u8  new_master;
74         u8  dead_node;
75         u16 state;
76         unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
77         wait_queue_head_t event;
78 };
79
80 enum dlm_ctxt_state {
81         DLM_CTXT_NEW = 0,
82         DLM_CTXT_JOINED,
83         DLM_CTXT_IN_SHUTDOWN,
84         DLM_CTXT_LEAVING,
85 };
86
87 struct dlm_ctxt
88 {
89         struct list_head list;
90         struct list_head *resources;
91         struct list_head dirty_list;
92         struct list_head purge_list;
93         struct list_head pending_asts;
94         struct list_head pending_basts;
95         unsigned int purge_count;
96         spinlock_t spinlock;
97         spinlock_t ast_lock;
98         char *name;
99         u8 node_num;
100         u32 key;
101         u8  joining_node;
102         wait_queue_head_t dlm_join_events;
103         unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
104         unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
105         unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
106         struct dlm_recovery_ctxt reco;
107         spinlock_t master_lock;
108         struct list_head master_list;
109         struct list_head mle_hb_events;
110
111         /* these give a really vague idea of the system load */
112         atomic_t local_resources;
113         atomic_t remote_resources;
114         atomic_t unknown_resources;
115
116         /* NOTE: Next three are protected by dlm_domain_lock */
117         struct kref dlm_refs;
118         enum dlm_ctxt_state dlm_state;
119         unsigned int num_joins;
120
121         struct o2hb_callback_func dlm_hb_up;
122         struct o2hb_callback_func dlm_hb_down;
123         struct task_struct *dlm_thread_task;
124         struct task_struct *dlm_reco_thread_task;
125         wait_queue_head_t dlm_thread_wq;
126         wait_queue_head_t dlm_reco_thread_wq;
127         wait_queue_head_t ast_wq;
128         wait_queue_head_t migration_wq;
129
130         struct work_struct dispatched_work;
131         struct list_head work_list;
132         spinlock_t work_lock;
133         struct list_head dlm_domain_handlers;
134         struct list_head        dlm_eviction_callbacks;
135 };
136
137 /* these keventd work queue items are for less-frequently
138  * called functions that cannot be directly called from the
139  * net message handlers for some reason, usually because
140  * they need to send net messages of their own. */
141 void dlm_dispatch_work(void *data);
142
143 struct dlm_lock_resource;
144 struct dlm_work_item;
145
146 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
147
148 struct dlm_request_all_locks_priv
149 {
150         u8 reco_master;
151         u8 dead_node;
152 };
153
154 struct dlm_mig_lockres_priv
155 {
156         struct dlm_lock_resource *lockres;
157         u8 real_master;
158 };
159
160 struct dlm_assert_master_priv
161 {
162         struct dlm_lock_resource *lockres;
163         u8 request_from;
164         u32 flags;
165         unsigned ignore_higher:1;
166 };
167
168
169 struct dlm_work_item
170 {
171         struct list_head list;
172         dlm_workfunc_t *func;
173         struct dlm_ctxt *dlm;
174         void *data;
175         union {
176                 struct dlm_request_all_locks_priv ral;
177                 struct dlm_mig_lockres_priv ml;
178                 struct dlm_assert_master_priv am;
179         } u;
180 };
181
182 static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
183                                       struct dlm_work_item *i,
184                                       dlm_workfunc_t *f, void *data)
185 {
186         memset(i, 0, sizeof(*i));
187         i->func = f;
188         INIT_LIST_HEAD(&i->list);
189         i->data = data;
190         i->dlm = dlm;  /* must have already done a dlm_grab on this! */
191 }
192
193
194
195 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
196                                           u8 node)
197 {
198         assert_spin_locked(&dlm->spinlock);
199
200         dlm->joining_node = node;
201         wake_up(&dlm->dlm_join_events);
202 }
203
204 #define DLM_LOCK_RES_UNINITED             0x00000001
205 #define DLM_LOCK_RES_RECOVERING           0x00000002
206 #define DLM_LOCK_RES_READY                0x00000004
207 #define DLM_LOCK_RES_DIRTY                0x00000008
208 #define DLM_LOCK_RES_IN_PROGRESS          0x00000010
209 #define DLM_LOCK_RES_MIGRATING            0x00000020
210
211 /* max milliseconds to wait to sync up a network failure with a node death */
212 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
213
214 #define DLM_PURGE_INTERVAL_MS   (8 * 1000)
215
216 struct dlm_lock_resource
217 {
218         /* WARNING: Please see the comment in dlm_init_lockres before
219          * adding fields here. */
220         struct list_head list;
221         struct kref      refs;
222
223         /* please keep these next 3 in this order
224          * some funcs want to iterate over all lists */
225         struct list_head granted;
226         struct list_head converting;
227         struct list_head blocked;
228
229         struct list_head dirty;
230         struct list_head recovering; // dlm_recovery_ctxt.resources list
231
232         /* unused lock resources have their last_used stamped and are
233          * put on a list for the dlm thread to run. */
234         struct list_head purge;
235         unsigned long    last_used;
236
237         unsigned migration_pending:1;
238         atomic_t asts_reserved;
239         spinlock_t spinlock;
240         wait_queue_head_t wq;
241         u8  owner;              //node which owns the lock resource, or unknown
242         u16 state;
243         struct qstr lockname;
244         char lvb[DLM_LVB_LEN];
245 };
246
247 struct dlm_migratable_lock
248 {
249         __be64 cookie;
250
251         /* these 3 are just padding for the in-memory structure, but
252          * list and flags are actually used when sent over the wire */
253         __be16 pad1;
254         u8 list;  // 0=granted, 1=converting, 2=blocked
255         u8 flags;
256
257         s8 type;
258         s8 convert_type;
259         s8 highest_blocked;
260         u8 node;
261 };  // 16 bytes
262
263 struct dlm_lock
264 {
265         struct dlm_migratable_lock ml;
266
267         struct list_head list;
268         struct list_head ast_list;
269         struct list_head bast_list;
270         struct dlm_lock_resource *lockres;
271         spinlock_t spinlock;
272         struct kref lock_refs;
273
274         // ast and bast must be callable while holding a spinlock!
275         dlm_astlockfunc_t *ast;
276         dlm_bastlockfunc_t *bast;
277         void *astdata;
278         struct dlm_lockstatus *lksb;
279         unsigned ast_pending:1,
280                  bast_pending:1,
281                  convert_pending:1,
282                  lock_pending:1,
283                  cancel_pending:1,
284                  unlock_pending:1,
285                  lksb_kernel_allocated:1;
286 };
287
288
289 #define DLM_LKSB_UNUSED1           0x01
290 #define DLM_LKSB_PUT_LVB           0x02
291 #define DLM_LKSB_GET_LVB           0x04
292 #define DLM_LKSB_UNUSED2           0x08
293 #define DLM_LKSB_UNUSED3           0x10
294 #define DLM_LKSB_UNUSED4           0x20
295 #define DLM_LKSB_UNUSED5           0x40
296 #define DLM_LKSB_UNUSED6           0x80
297
298
299 enum dlm_lockres_list {
300         DLM_GRANTED_LIST = 0,
301         DLM_CONVERTING_LIST,
302         DLM_BLOCKED_LIST
303 };
304
305 static inline struct list_head *
306 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
307 {
308         struct list_head *ret = NULL;
309         if (idx == DLM_GRANTED_LIST)
310                 ret = &res->granted;
311         else if (idx == DLM_CONVERTING_LIST)
312                 ret = &res->converting;
313         else if (idx == DLM_BLOCKED_LIST)
314                 ret = &res->blocked;
315         else
316                 BUG();
317         return ret;
318 }
319
320
321
322
323 struct dlm_node_iter
324 {
325         unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
326         int curnode;
327 };
328
329
330 enum {
331         DLM_MASTER_REQUEST_MSG    = 500,
332         DLM_UNUSED_MSG1,         /* 501 */
333         DLM_ASSERT_MASTER_MSG,   /* 502 */
334         DLM_CREATE_LOCK_MSG,     /* 503 */
335         DLM_CONVERT_LOCK_MSG,    /* 504 */
336         DLM_PROXY_AST_MSG,       /* 505 */
337         DLM_UNLOCK_LOCK_MSG,     /* 506 */
338         DLM_UNUSED_MSG2,         /* 507 */
339         DLM_MIGRATE_REQUEST_MSG, /* 508 */
340         DLM_MIG_LOCKRES_MSG,     /* 509 */
341         DLM_QUERY_JOIN_MSG,      /* 510 */
342         DLM_ASSERT_JOINED_MSG,   /* 511 */
343         DLM_CANCEL_JOIN_MSG,     /* 512 */
344         DLM_EXIT_DOMAIN_MSG,     /* 513 */
345         DLM_MASTER_REQUERY_MSG,  /* 514 */
346         DLM_LOCK_REQUEST_MSG,    /* 515 */
347         DLM_RECO_DATA_DONE_MSG,  /* 516 */
348         DLM_BEGIN_RECO_MSG,      /* 517 */
349         DLM_FINALIZE_RECO_MSG    /* 518 */
350 };
351
352 struct dlm_reco_node_data
353 {
354         int state;
355         u8 node_num;
356         struct list_head list;
357 };
358
359 enum {
360         DLM_RECO_NODE_DATA_DEAD = -1,
361         DLM_RECO_NODE_DATA_INIT = 0,
362         DLM_RECO_NODE_DATA_REQUESTING,
363         DLM_RECO_NODE_DATA_REQUESTED,
364         DLM_RECO_NODE_DATA_RECEIVING,
365         DLM_RECO_NODE_DATA_DONE,
366         DLM_RECO_NODE_DATA_FINALIZE_SENT,
367 };
368
369
370 enum {
371         DLM_MASTER_RESP_NO = 0,
372         DLM_MASTER_RESP_YES,
373         DLM_MASTER_RESP_MAYBE,
374         DLM_MASTER_RESP_ERROR
375 };
376
377
378 struct dlm_master_request
379 {
380         u8 node_idx;
381         u8 namelen;
382         __be16 pad1;
383         __be32 flags;
384
385         u8 name[O2NM_MAX_NAME_LEN];
386 };
387
388 #define DLM_ASSERT_MASTER_MLE_CLEANUP      0x00000001
389 #define DLM_ASSERT_MASTER_REQUERY          0x00000002
390 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
391 struct dlm_assert_master
392 {
393         u8 node_idx;
394         u8 namelen;
395         __be16 pad1;
396         __be32 flags;
397
398         u8 name[O2NM_MAX_NAME_LEN];
399 };
400
401 struct dlm_migrate_request
402 {
403         u8 master;
404         u8 new_master;
405         u8 namelen;
406         u8 pad1;
407         __be32 pad2;
408         u8 name[O2NM_MAX_NAME_LEN];
409 };
410
411 struct dlm_master_requery
412 {
413         u8 pad1;
414         u8 pad2;
415         u8 node_idx;
416         u8 namelen;
417         __be32 pad3;
418         u8 name[O2NM_MAX_NAME_LEN];
419 };
420
421 #define DLM_MRES_RECOVERY   0x01
422 #define DLM_MRES_MIGRATION  0x02
423 #define DLM_MRES_ALL_DONE   0x04
424
425 /*
426  * We would like to get one whole lockres into a single network
427  * message whenever possible.  Generally speaking, there will be
428  * at most one dlm_lock on a lockres for each node in the cluster,
429  * plus (infrequently) any additional locks coming in from userdlm.
430  *
431  * struct _dlm_lockres_page
432  * {
433  *      dlm_migratable_lockres mres;
434  *      dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
435  *      u8 pad[DLM_MIG_LOCKRES_RESERVED];
436  * };
437  *
438  * from ../cluster/tcp.h
439  *    NET_MAX_PAYLOAD_BYTES  (4096 - sizeof(net_msg))
440  *    (roughly 4080 bytes)
441  * and sizeof(dlm_migratable_lockres) = 112 bytes
442  * and sizeof(dlm_migratable_lock) = 16 bytes
443  *
444  * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
445  * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
446  *
447  *  (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
448  *     sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
449  *        NET_MAX_PAYLOAD_BYTES
450  *  (240 * 16) + 112 + 128 = 4080
451  *
452  * So a lockres would need more than 240 locks before it would
453  * use more than one network packet to recover.  Not too bad.
454  */
455 #define DLM_MAX_MIGRATABLE_LOCKS   240
456
457 struct dlm_migratable_lockres
458 {
459         u8 master;
460         u8 lockname_len;
461         u8 num_locks;    // locks sent in this structure
462         u8 flags;
463         __be32 total_locks; // locks to be sent for this migration cookie
464         __be64 mig_cookie;  // cookie for this lockres migration
465                          // or zero if not needed
466         // 16 bytes
467         u8 lockname[DLM_LOCKID_NAME_MAX];
468         // 48 bytes
469         u8 lvb[DLM_LVB_LEN];
470         // 112 bytes
471         struct dlm_migratable_lock ml[0];  // 16 bytes each, begins at byte 112
472 };
473 #define DLM_MIG_LOCKRES_MAX_LEN  \
474         (sizeof(struct dlm_migratable_lockres) + \
475          (sizeof(struct dlm_migratable_lock) * \
476           DLM_MAX_MIGRATABLE_LOCKS) )
477
478 /* from above, 128 bytes
479  * for some undetermined future use */
480 #define DLM_MIG_LOCKRES_RESERVED   (NET_MAX_PAYLOAD_BYTES - \
481                                     DLM_MIG_LOCKRES_MAX_LEN)
482
483 struct dlm_create_lock
484 {
485         __be64 cookie;
486
487         __be32 flags;
488         u8 pad1;
489         u8 node_idx;
490         s8 requested_type;
491         u8 namelen;
492
493         u8 name[O2NM_MAX_NAME_LEN];
494 };
495
496 struct dlm_convert_lock
497 {
498         __be64 cookie;
499
500         __be32 flags;
501         u8 pad1;
502         u8 node_idx;
503         s8 requested_type;
504         u8 namelen;
505
506         u8 name[O2NM_MAX_NAME_LEN];
507
508         s8 lvb[0];
509 };
510 #define DLM_CONVERT_LOCK_MAX_LEN  (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
511
512 struct dlm_unlock_lock
513 {
514         __be64 cookie;
515
516         __be32 flags;
517         __be16 pad1;
518         u8 node_idx;
519         u8 namelen;
520
521         u8 name[O2NM_MAX_NAME_LEN];
522
523         s8 lvb[0];
524 };
525 #define DLM_UNLOCK_LOCK_MAX_LEN  (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
526
527 struct dlm_proxy_ast
528 {
529         __be64 cookie;
530
531         __be32 flags;
532         u8 node_idx;
533         u8 type;
534         u8 blocked_type;
535         u8 namelen;
536
537         u8 name[O2NM_MAX_NAME_LEN];
538
539         s8 lvb[0];
540 };
541 #define DLM_PROXY_AST_MAX_LEN  (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
542
543 #define DLM_MOD_KEY (0x666c6172)
544 enum dlm_query_join_response {
545         JOIN_DISALLOW = 0,
546         JOIN_OK,
547         JOIN_OK_NO_MAP,
548 };
549
550 struct dlm_lock_request
551 {
552         u8 node_idx;
553         u8 dead_node;
554         __be16 pad1;
555         __be32 pad2;
556 };
557
558 struct dlm_reco_data_done
559 {
560         u8 node_idx;
561         u8 dead_node;
562         __be16 pad1;
563         __be32 pad2;
564
565         /* unused for now */
566         /* eventually we can use this to attempt
567          * lvb recovery based on each node's info */
568         u8 reco_lvb[DLM_LVB_LEN];
569 };
570
571 struct dlm_begin_reco
572 {
573         u8 node_idx;
574         u8 dead_node;
575         __be16 pad1;
576         __be32 pad2;
577 };
578
579
580 struct dlm_query_join_request
581 {
582         u8 node_idx;
583         u8 pad1[2];
584         u8 name_len;
585         u8 domain[O2NM_MAX_NAME_LEN];
586 };
587
588 struct dlm_assert_joined
589 {
590         u8 node_idx;
591         u8 pad1[2];
592         u8 name_len;
593         u8 domain[O2NM_MAX_NAME_LEN];
594 };
595
596 struct dlm_cancel_join
597 {
598         u8 node_idx;
599         u8 pad1[2];
600         u8 name_len;
601         u8 domain[O2NM_MAX_NAME_LEN];
602 };
603
604 struct dlm_exit_domain
605 {
606         u8 node_idx;
607         u8 pad1[3];
608 };
609
610 struct dlm_finalize_reco
611 {
612         u8 node_idx;
613         u8 dead_node;
614         __be16 pad1;
615         __be32 pad2;
616 };
617
618 static inline enum dlm_status
619 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
620 {
621         enum dlm_status status = DLM_NORMAL;
622
623         assert_spin_locked(&res->spinlock);
624
625         if (res->state & DLM_LOCK_RES_RECOVERING)
626                 status = DLM_RECOVERING;
627         else if (res->state & DLM_LOCK_RES_MIGRATING)
628                 status = DLM_MIGRATING;
629         else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
630                 status = DLM_FORWARD;
631
632         return status;
633 }
634
635 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
636                                struct dlm_lockstatus *lksb);
637 void dlm_lock_get(struct dlm_lock *lock);
638 void dlm_lock_put(struct dlm_lock *lock);
639
640 void dlm_lock_attach_lockres(struct dlm_lock *lock,
641                              struct dlm_lock_resource *res);
642
643 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
644 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
645 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
646
647 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
648                                 struct dlm_lock *lock);
649 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
650                              struct dlm_lock *lock);
651
652 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
653 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
654                                struct dlm_lock *lock);
655 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
656                                struct dlm_lock *lock);
657
658 int dlm_launch_thread(struct dlm_ctxt *dlm);
659 void dlm_complete_thread(struct dlm_ctxt *dlm);
660 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
661 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
662 void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
663 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
664 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
665
666 void dlm_put(struct dlm_ctxt *dlm);
667 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
668 int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
669
670 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
671                               struct dlm_lock_resource *res);
672 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
673                             struct dlm_lock_resource *res);
674 void dlm_purge_lockres(struct dlm_ctxt *dlm,
675                        struct dlm_lock_resource *lockres);
676 void dlm_lockres_get(struct dlm_lock_resource *res);
677 void dlm_lockres_put(struct dlm_lock_resource *res);
678 void __dlm_unhash_lockres(struct dlm_lock_resource *res);
679 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
680                           struct dlm_lock_resource *res);
681 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
682                                                 const char *name,
683                                                 unsigned int len);
684 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
685                                               const char *name,
686                                               unsigned int len);
687
688 int dlm_is_host_down(int errno);
689 void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
690                               struct dlm_lock_resource *res,
691                               u8 owner);
692 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
693                                                  const char *lockid,
694                                                  int flags);
695 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
696                                           const char *name,
697                                           unsigned int namelen);
698
699 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
700 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
701 void dlm_do_local_ast(struct dlm_ctxt *dlm,
702                       struct dlm_lock_resource *res,
703                       struct dlm_lock *lock);
704 int dlm_do_remote_ast(struct dlm_ctxt *dlm,
705                       struct dlm_lock_resource *res,
706                       struct dlm_lock *lock);
707 void dlm_do_local_bast(struct dlm_ctxt *dlm,
708                        struct dlm_lock_resource *res,
709                        struct dlm_lock *lock,
710                        int blocked_type);
711 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
712                            struct dlm_lock_resource *res,
713                            struct dlm_lock *lock,
714                            int msg_type,
715                            int blocked_type, int flags);
716 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
717                                       struct dlm_lock_resource *res,
718                                       struct dlm_lock *lock,
719                                       int blocked_type)
720 {
721         return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
722                                       blocked_type, 0);
723 }
724
725 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
726                                      struct dlm_lock_resource *res,
727                                      struct dlm_lock *lock,
728                                      int flags)
729 {
730         return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
731                                       0, flags);
732 }
733
734 void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
735 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
736
737 u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
738 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
739 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
740
741
742 int dlm_nm_init(struct dlm_ctxt *dlm);
743 int dlm_heartbeat_init(struct dlm_ctxt *dlm);
744 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
745 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
746
747 int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
748 int dlm_migrate_lockres(struct dlm_ctxt *dlm,
749                         struct dlm_lock_resource *res,
750                         u8 target);
751 int dlm_finish_migration(struct dlm_ctxt *dlm,
752                          struct dlm_lock_resource *res,
753                          u8 old_master);
754 void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
755                              struct dlm_lock_resource *res);
756 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
757
758 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
759 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
760 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
761 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
762 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
763 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
764 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
765 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
766 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
767
768 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
769                                struct dlm_lock_resource *res,
770                                int ignore_higher,
771                                u8 request_from,
772                                u32 flags);
773
774
775 int dlm_send_one_lockres(struct dlm_ctxt *dlm,
776                          struct dlm_lock_resource *res,
777                          struct dlm_migratable_lockres *mres,
778                          u8 send_to,
779                          u8 flags);
780 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
781                                        struct dlm_lock_resource *res);
782
783 /* will exit holding res->spinlock, but may drop in function */
784 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
785 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
786
787 /* will exit holding res->spinlock, but may drop in function */
788 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
789 {
790         __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
791                                           DLM_LOCK_RES_RECOVERING|
792                                           DLM_LOCK_RES_MIGRATING));
793 }
794
795
796 int dlm_init_mle_cache(void);
797 void dlm_destroy_mle_cache(void);
798 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
799 void dlm_clean_master_list(struct dlm_ctxt *dlm,
800                            u8 dead_node);
801 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
802
803
804 static inline const char * dlm_lock_mode_name(int mode)
805 {
806         switch (mode) {
807                 case LKM_EXMODE:
808                         return "EX";
809                 case LKM_PRMODE:
810                         return "PR";
811                 case LKM_NLMODE:
812                         return "NL";
813         }
814         return "UNKNOWN";
815 }
816
817
818 static inline int dlm_lock_compatible(int existing, int request)
819 {
820         /* NO_LOCK compatible with all */
821         if (request == LKM_NLMODE ||
822             existing == LKM_NLMODE)
823                 return 1;
824
825         /* EX incompatible with all non-NO_LOCK */
826         if (request == LKM_EXMODE)
827                 return 0;
828
829         /* request must be PR, which is compatible with PR */
830         if (existing == LKM_PRMODE)
831                 return 1;
832
833         return 0;
834 }
835
836 static inline int dlm_lock_on_list(struct list_head *head,
837                                    struct dlm_lock *lock)
838 {
839         struct list_head *iter;
840         struct dlm_lock *tmplock;
841
842         list_for_each(iter, head) {
843                 tmplock = list_entry(iter, struct dlm_lock, list);
844                 if (tmplock == lock)
845                         return 1;
846         }
847         return 0;
848 }
849
850
851 static inline enum dlm_status dlm_err_to_dlm_status(int err)
852 {
853         enum dlm_status ret;
854         if (err == -ENOMEM)
855                 ret = DLM_SYSERR;
856         else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
857                 ret = DLM_NOLOCKMGR;
858         else if (err == -EINVAL)
859                 ret = DLM_BADPARAM;
860         else if (err == -ENAMETOOLONG)
861                 ret = DLM_IVBUFLEN;
862         else
863                 ret = DLM_BADARGS;
864         return ret;
865 }
866
867
868 static inline void dlm_node_iter_init(unsigned long *map,
869                                       struct dlm_node_iter *iter)
870 {
871         memcpy(iter->node_map, map, sizeof(iter->node_map));
872         iter->curnode = -1;
873 }
874
875 static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
876 {
877         int bit;
878         bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
879         if (bit >= O2NM_MAX_NODES) {
880                 iter->curnode = O2NM_MAX_NODES;
881                 return -ENOENT;
882         }
883         iter->curnode = bit;
884         return bit;
885 }
886
887
888
889 #endif /* DLMCOMMON_H */