]> www.pilppa.org Git - linux-2.6-omap-h63xx.git/blob - fs/ocfs2/dlm/dlmcommon.h
[PATCH] ocfs2: Alloc at least a page for the DLM hash
[linux-2.6-omap-h63xx.git] / fs / ocfs2 / dlm / dlmcommon.h
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_SIZE_DEFAULT   (1 << 14)
41 #if DLM_HASH_SIZE_DEFAULT < PAGE_SIZE
42 # define DLM_HASH_PAGES         1
43 #else
44 # define DLM_HASH_PAGES         (DLM_HASH_SIZE_DEFAULT / PAGE_SIZE)
45 #endif
46 #define DLM_BUCKETS_PER_PAGE    (PAGE_SIZE / sizeof(struct hlist_head))
47 #define DLM_HASH_BUCKETS        (DLM_HASH_PAGES * DLM_BUCKETS_PER_PAGE)
48
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)
51
52 enum dlm_ast_type {
53         DLM_AST = 0,
54         DLM_BAST,
55         DLM_ASTUNLOCK
56 };
57
58
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)
62
63 #define DLM_RECOVERY_LOCK_NAME       "$RECOVERY"
64 #define DLM_RECOVERY_LOCK_NAME_LEN   9
65
66 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
67 {
68         if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
69             memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
70                 return 1;
71         return 0;
72 }
73
74 #define DLM_RECO_STATE_ACTIVE  0x0001
75
76 struct dlm_recovery_ctxt
77 {
78         struct list_head resources;
79         struct list_head received;
80         struct list_head node_data;
81         u8  new_master;
82         u8  dead_node;
83         u16 state;
84         unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
85         wait_queue_head_t event;
86 };
87
88 enum dlm_ctxt_state {
89         DLM_CTXT_NEW = 0,
90         DLM_CTXT_JOINED,
91         DLM_CTXT_IN_SHUTDOWN,
92         DLM_CTXT_LEAVING,
93 };
94
95 struct dlm_ctxt
96 {
97         struct list_head list;
98         struct hlist_head **lockres_hash;
99         struct list_head dirty_list;
100         struct list_head purge_list;
101         struct list_head pending_asts;
102         struct list_head pending_basts;
103         unsigned int purge_count;
104         spinlock_t spinlock;
105         spinlock_t ast_lock;
106         char *name;
107         u8 node_num;
108         u32 key;
109         u8  joining_node;
110         wait_queue_head_t dlm_join_events;
111         unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
112         unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
113         unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
114         struct dlm_recovery_ctxt reco;
115         spinlock_t master_lock;
116         struct list_head master_list;
117         struct list_head mle_hb_events;
118
119         /* these give a really vague idea of the system load */
120         atomic_t local_resources;
121         atomic_t remote_resources;
122         atomic_t unknown_resources;
123
124         /* NOTE: Next three are protected by dlm_domain_lock */
125         struct kref dlm_refs;
126         enum dlm_ctxt_state dlm_state;
127         unsigned int num_joins;
128
129         struct o2hb_callback_func dlm_hb_up;
130         struct o2hb_callback_func dlm_hb_down;
131         struct task_struct *dlm_thread_task;
132         struct task_struct *dlm_reco_thread_task;
133         wait_queue_head_t dlm_thread_wq;
134         wait_queue_head_t dlm_reco_thread_wq;
135         wait_queue_head_t ast_wq;
136         wait_queue_head_t migration_wq;
137
138         struct work_struct dispatched_work;
139         struct list_head work_list;
140         spinlock_t work_lock;
141         struct list_head dlm_domain_handlers;
142         struct list_head        dlm_eviction_callbacks;
143 };
144
145 static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
146 {
147         return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE);
148 }
149
150 /* these keventd work queue items are for less-frequently
151  * called functions that cannot be directly called from the
152  * net message handlers for some reason, usually because
153  * they need to send net messages of their own. */
154 void dlm_dispatch_work(void *data);
155
156 struct dlm_lock_resource;
157 struct dlm_work_item;
158
159 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
160
161 struct dlm_request_all_locks_priv
162 {
163         u8 reco_master;
164         u8 dead_node;
165 };
166
167 struct dlm_mig_lockres_priv
168 {
169         struct dlm_lock_resource *lockres;
170         u8 real_master;
171 };
172
173 struct dlm_assert_master_priv
174 {
175         struct dlm_lock_resource *lockres;
176         u8 request_from;
177         u32 flags;
178         unsigned ignore_higher:1;
179 };
180
181
182 struct dlm_work_item
183 {
184         struct list_head list;
185         dlm_workfunc_t *func;
186         struct dlm_ctxt *dlm;
187         void *data;
188         union {
189                 struct dlm_request_all_locks_priv ral;
190                 struct dlm_mig_lockres_priv ml;
191                 struct dlm_assert_master_priv am;
192         } u;
193 };
194
195 static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
196                                       struct dlm_work_item *i,
197                                       dlm_workfunc_t *f, void *data)
198 {
199         memset(i, 0, sizeof(*i));
200         i->func = f;
201         INIT_LIST_HEAD(&i->list);
202         i->data = data;
203         i->dlm = dlm;  /* must have already done a dlm_grab on this! */
204 }
205
206
207
208 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
209                                           u8 node)
210 {
211         assert_spin_locked(&dlm->spinlock);
212
213         dlm->joining_node = node;
214         wake_up(&dlm->dlm_join_events);
215 }
216
217 #define DLM_LOCK_RES_UNINITED             0x00000001
218 #define DLM_LOCK_RES_RECOVERING           0x00000002
219 #define DLM_LOCK_RES_READY                0x00000004
220 #define DLM_LOCK_RES_DIRTY                0x00000008
221 #define DLM_LOCK_RES_IN_PROGRESS          0x00000010
222 #define DLM_LOCK_RES_MIGRATING            0x00000020
223
224 /* max milliseconds to wait to sync up a network failure with a node death */
225 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
226
227 #define DLM_PURGE_INTERVAL_MS   (8 * 1000)
228
229 struct dlm_lock_resource
230 {
231         /* WARNING: Please see the comment in dlm_init_lockres before
232          * adding fields here. */
233         struct hlist_node hash_node;
234         struct qstr lockname;
235         struct kref      refs;
236
237         /* please keep these next 3 in this order
238          * some funcs want to iterate over all lists */
239         struct list_head granted;
240         struct list_head converting;
241         struct list_head blocked;
242
243         struct list_head dirty;
244         struct list_head recovering; // dlm_recovery_ctxt.resources list
245
246         /* unused lock resources have their last_used stamped and are
247          * put on a list for the dlm thread to run. */
248         struct list_head purge;
249         unsigned long    last_used;
250
251         unsigned migration_pending:1;
252         atomic_t asts_reserved;
253         spinlock_t spinlock;
254         wait_queue_head_t wq;
255         u8  owner;              //node which owns the lock resource, or unknown
256         u16 state;
257         char lvb[DLM_LVB_LEN];
258 };
259
260 struct dlm_migratable_lock
261 {
262         __be64 cookie;
263
264         /* these 3 are just padding for the in-memory structure, but
265          * list and flags are actually used when sent over the wire */
266         __be16 pad1;
267         u8 list;  // 0=granted, 1=converting, 2=blocked
268         u8 flags;
269
270         s8 type;
271         s8 convert_type;
272         s8 highest_blocked;
273         u8 node;
274 };  // 16 bytes
275
276 struct dlm_lock
277 {
278         struct dlm_migratable_lock ml;
279
280         struct list_head list;
281         struct list_head ast_list;
282         struct list_head bast_list;
283         struct dlm_lock_resource *lockres;
284         spinlock_t spinlock;
285         struct kref lock_refs;
286
287         // ast and bast must be callable while holding a spinlock!
288         dlm_astlockfunc_t *ast;
289         dlm_bastlockfunc_t *bast;
290         void *astdata;
291         struct dlm_lockstatus *lksb;
292         unsigned ast_pending:1,
293                  bast_pending:1,
294                  convert_pending:1,
295                  lock_pending:1,
296                  cancel_pending:1,
297                  unlock_pending:1,
298                  lksb_kernel_allocated:1;
299 };
300
301
302 #define DLM_LKSB_UNUSED1           0x01
303 #define DLM_LKSB_PUT_LVB           0x02
304 #define DLM_LKSB_GET_LVB           0x04
305 #define DLM_LKSB_UNUSED2           0x08
306 #define DLM_LKSB_UNUSED3           0x10
307 #define DLM_LKSB_UNUSED4           0x20
308 #define DLM_LKSB_UNUSED5           0x40
309 #define DLM_LKSB_UNUSED6           0x80
310
311
312 enum dlm_lockres_list {
313         DLM_GRANTED_LIST = 0,
314         DLM_CONVERTING_LIST,
315         DLM_BLOCKED_LIST
316 };
317
318 static inline struct list_head *
319 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
320 {
321         struct list_head *ret = NULL;
322         if (idx == DLM_GRANTED_LIST)
323                 ret = &res->granted;
324         else if (idx == DLM_CONVERTING_LIST)
325                 ret = &res->converting;
326         else if (idx == DLM_BLOCKED_LIST)
327                 ret = &res->blocked;
328         else
329                 BUG();
330         return ret;
331 }
332
333
334
335
336 struct dlm_node_iter
337 {
338         unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
339         int curnode;
340 };
341
342
343 enum {
344         DLM_MASTER_REQUEST_MSG    = 500,
345         DLM_UNUSED_MSG1,         /* 501 */
346         DLM_ASSERT_MASTER_MSG,   /* 502 */
347         DLM_CREATE_LOCK_MSG,     /* 503 */
348         DLM_CONVERT_LOCK_MSG,    /* 504 */
349         DLM_PROXY_AST_MSG,       /* 505 */
350         DLM_UNLOCK_LOCK_MSG,     /* 506 */
351         DLM_UNUSED_MSG2,         /* 507 */
352         DLM_MIGRATE_REQUEST_MSG, /* 508 */
353         DLM_MIG_LOCKRES_MSG,     /* 509 */
354         DLM_QUERY_JOIN_MSG,      /* 510 */
355         DLM_ASSERT_JOINED_MSG,   /* 511 */
356         DLM_CANCEL_JOIN_MSG,     /* 512 */
357         DLM_EXIT_DOMAIN_MSG,     /* 513 */
358         DLM_MASTER_REQUERY_MSG,  /* 514 */
359         DLM_LOCK_REQUEST_MSG,    /* 515 */
360         DLM_RECO_DATA_DONE_MSG,  /* 516 */
361         DLM_BEGIN_RECO_MSG,      /* 517 */
362         DLM_FINALIZE_RECO_MSG    /* 518 */
363 };
364
365 struct dlm_reco_node_data
366 {
367         int state;
368         u8 node_num;
369         struct list_head list;
370 };
371
372 enum {
373         DLM_RECO_NODE_DATA_DEAD = -1,
374         DLM_RECO_NODE_DATA_INIT = 0,
375         DLM_RECO_NODE_DATA_REQUESTING,
376         DLM_RECO_NODE_DATA_REQUESTED,
377         DLM_RECO_NODE_DATA_RECEIVING,
378         DLM_RECO_NODE_DATA_DONE,
379         DLM_RECO_NODE_DATA_FINALIZE_SENT,
380 };
381
382
383 enum {
384         DLM_MASTER_RESP_NO = 0,
385         DLM_MASTER_RESP_YES,
386         DLM_MASTER_RESP_MAYBE,
387         DLM_MASTER_RESP_ERROR
388 };
389
390
391 struct dlm_master_request
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 #define DLM_ASSERT_MASTER_MLE_CLEANUP      0x00000001
402 #define DLM_ASSERT_MASTER_REQUERY          0x00000002
403 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
404 struct dlm_assert_master
405 {
406         u8 node_idx;
407         u8 namelen;
408         __be16 pad1;
409         __be32 flags;
410
411         u8 name[O2NM_MAX_NAME_LEN];
412 };
413
414 struct dlm_migrate_request
415 {
416         u8 master;
417         u8 new_master;
418         u8 namelen;
419         u8 pad1;
420         __be32 pad2;
421         u8 name[O2NM_MAX_NAME_LEN];
422 };
423
424 struct dlm_master_requery
425 {
426         u8 pad1;
427         u8 pad2;
428         u8 node_idx;
429         u8 namelen;
430         __be32 pad3;
431         u8 name[O2NM_MAX_NAME_LEN];
432 };
433
434 #define DLM_MRES_RECOVERY   0x01
435 #define DLM_MRES_MIGRATION  0x02
436 #define DLM_MRES_ALL_DONE   0x04
437
438 /*
439  * We would like to get one whole lockres into a single network
440  * message whenever possible.  Generally speaking, there will be
441  * at most one dlm_lock on a lockres for each node in the cluster,
442  * plus (infrequently) any additional locks coming in from userdlm.
443  *
444  * struct _dlm_lockres_page
445  * {
446  *      dlm_migratable_lockres mres;
447  *      dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
448  *      u8 pad[DLM_MIG_LOCKRES_RESERVED];
449  * };
450  *
451  * from ../cluster/tcp.h
452  *    NET_MAX_PAYLOAD_BYTES  (4096 - sizeof(net_msg))
453  *    (roughly 4080 bytes)
454  * and sizeof(dlm_migratable_lockres) = 112 bytes
455  * and sizeof(dlm_migratable_lock) = 16 bytes
456  *
457  * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
458  * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
459  *
460  *  (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
461  *     sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
462  *        NET_MAX_PAYLOAD_BYTES
463  *  (240 * 16) + 112 + 128 = 4080
464  *
465  * So a lockres would need more than 240 locks before it would
466  * use more than one network packet to recover.  Not too bad.
467  */
468 #define DLM_MAX_MIGRATABLE_LOCKS   240
469
470 struct dlm_migratable_lockres
471 {
472         u8 master;
473         u8 lockname_len;
474         u8 num_locks;    // locks sent in this structure
475         u8 flags;
476         __be32 total_locks; // locks to be sent for this migration cookie
477         __be64 mig_cookie;  // cookie for this lockres migration
478                          // or zero if not needed
479         // 16 bytes
480         u8 lockname[DLM_LOCKID_NAME_MAX];
481         // 48 bytes
482         u8 lvb[DLM_LVB_LEN];
483         // 112 bytes
484         struct dlm_migratable_lock ml[0];  // 16 bytes each, begins at byte 112
485 };
486 #define DLM_MIG_LOCKRES_MAX_LEN  \
487         (sizeof(struct dlm_migratable_lockres) + \
488          (sizeof(struct dlm_migratable_lock) * \
489           DLM_MAX_MIGRATABLE_LOCKS) )
490
491 /* from above, 128 bytes
492  * for some undetermined future use */
493 #define DLM_MIG_LOCKRES_RESERVED   (NET_MAX_PAYLOAD_BYTES - \
494                                     DLM_MIG_LOCKRES_MAX_LEN)
495
496 struct dlm_create_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
509 struct dlm_convert_lock
510 {
511         __be64 cookie;
512
513         __be32 flags;
514         u8 pad1;
515         u8 node_idx;
516         s8 requested_type;
517         u8 namelen;
518
519         u8 name[O2NM_MAX_NAME_LEN];
520
521         s8 lvb[0];
522 };
523 #define DLM_CONVERT_LOCK_MAX_LEN  (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
524
525 struct dlm_unlock_lock
526 {
527         __be64 cookie;
528
529         __be32 flags;
530         __be16 pad1;
531         u8 node_idx;
532         u8 namelen;
533
534         u8 name[O2NM_MAX_NAME_LEN];
535
536         s8 lvb[0];
537 };
538 #define DLM_UNLOCK_LOCK_MAX_LEN  (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
539
540 struct dlm_proxy_ast
541 {
542         __be64 cookie;
543
544         __be32 flags;
545         u8 node_idx;
546         u8 type;
547         u8 blocked_type;
548         u8 namelen;
549
550         u8 name[O2NM_MAX_NAME_LEN];
551
552         s8 lvb[0];
553 };
554 #define DLM_PROXY_AST_MAX_LEN  (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
555
556 #define DLM_MOD_KEY (0x666c6172)
557 enum dlm_query_join_response {
558         JOIN_DISALLOW = 0,
559         JOIN_OK,
560         JOIN_OK_NO_MAP,
561 };
562
563 struct dlm_lock_request
564 {
565         u8 node_idx;
566         u8 dead_node;
567         __be16 pad1;
568         __be32 pad2;
569 };
570
571 struct dlm_reco_data_done
572 {
573         u8 node_idx;
574         u8 dead_node;
575         __be16 pad1;
576         __be32 pad2;
577
578         /* unused for now */
579         /* eventually we can use this to attempt
580          * lvb recovery based on each node's info */
581         u8 reco_lvb[DLM_LVB_LEN];
582 };
583
584 struct dlm_begin_reco
585 {
586         u8 node_idx;
587         u8 dead_node;
588         __be16 pad1;
589         __be32 pad2;
590 };
591
592
593 struct dlm_query_join_request
594 {
595         u8 node_idx;
596         u8 pad1[2];
597         u8 name_len;
598         u8 domain[O2NM_MAX_NAME_LEN];
599 };
600
601 struct dlm_assert_joined
602 {
603         u8 node_idx;
604         u8 pad1[2];
605         u8 name_len;
606         u8 domain[O2NM_MAX_NAME_LEN];
607 };
608
609 struct dlm_cancel_join
610 {
611         u8 node_idx;
612         u8 pad1[2];
613         u8 name_len;
614         u8 domain[O2NM_MAX_NAME_LEN];
615 };
616
617 struct dlm_exit_domain
618 {
619         u8 node_idx;
620         u8 pad1[3];
621 };
622
623 struct dlm_finalize_reco
624 {
625         u8 node_idx;
626         u8 dead_node;
627         __be16 pad1;
628         __be32 pad2;
629 };
630
631 static inline enum dlm_status
632 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
633 {
634         enum dlm_status status = DLM_NORMAL;
635
636         assert_spin_locked(&res->spinlock);
637
638         if (res->state & DLM_LOCK_RES_RECOVERING)
639                 status = DLM_RECOVERING;
640         else if (res->state & DLM_LOCK_RES_MIGRATING)
641                 status = DLM_MIGRATING;
642         else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
643                 status = DLM_FORWARD;
644
645         return status;
646 }
647
648 static inline u8 dlm_get_lock_cookie_node(u64 cookie)
649 {
650         u8 ret;
651         cookie >>= 56;
652         ret = (u8)(cookie & 0xffULL);
653         return ret;
654 }
655
656 static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
657 {
658         unsigned long long ret;
659         ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
660         return ret;
661 }
662
663 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
664                                struct dlm_lockstatus *lksb);
665 void dlm_lock_get(struct dlm_lock *lock);
666 void dlm_lock_put(struct dlm_lock *lock);
667
668 void dlm_lock_attach_lockres(struct dlm_lock *lock,
669                              struct dlm_lock_resource *res);
670
671 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
672 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
673 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
674
675 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
676                                 struct dlm_lock *lock);
677 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
678                              struct dlm_lock *lock);
679
680 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
681 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
682                                struct dlm_lock *lock);
683 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
684                                struct dlm_lock *lock);
685
686 int dlm_launch_thread(struct dlm_ctxt *dlm);
687 void dlm_complete_thread(struct dlm_ctxt *dlm);
688 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
689 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
690 void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
691 void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
692 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
693 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
694
695 void dlm_put(struct dlm_ctxt *dlm);
696 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
697 int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
698
699 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
700                               struct dlm_lock_resource *res);
701 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
702                             struct dlm_lock_resource *res);
703 void dlm_purge_lockres(struct dlm_ctxt *dlm,
704                        struct dlm_lock_resource *lockres);
705 static inline void dlm_lockres_get(struct dlm_lock_resource *res)
706 {
707         /* This is called on every lookup, so it might be worth
708          * inlining. */
709         kref_get(&res->refs);
710 }
711 void dlm_lockres_put(struct dlm_lock_resource *res);
712 void __dlm_unhash_lockres(struct dlm_lock_resource *res);
713 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
714                           struct dlm_lock_resource *res);
715 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
716                                                 const char *name,
717                                                 unsigned int len,
718                                                 unsigned int hash);
719 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
720                                               const char *name,
721                                               unsigned int len);
722
723 int dlm_is_host_down(int errno);
724 void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
725                               struct dlm_lock_resource *res,
726                               u8 owner);
727 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
728                                                  const char *lockid,
729                                                  int flags);
730 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
731                                           const char *name,
732                                           unsigned int namelen);
733
734 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
735 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
736 void dlm_do_local_ast(struct dlm_ctxt *dlm,
737                       struct dlm_lock_resource *res,
738                       struct dlm_lock *lock);
739 int dlm_do_remote_ast(struct dlm_ctxt *dlm,
740                       struct dlm_lock_resource *res,
741                       struct dlm_lock *lock);
742 void dlm_do_local_bast(struct dlm_ctxt *dlm,
743                        struct dlm_lock_resource *res,
744                        struct dlm_lock *lock,
745                        int blocked_type);
746 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
747                            struct dlm_lock_resource *res,
748                            struct dlm_lock *lock,
749                            int msg_type,
750                            int blocked_type, int flags);
751 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
752                                       struct dlm_lock_resource *res,
753                                       struct dlm_lock *lock,
754                                       int blocked_type)
755 {
756         return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
757                                       blocked_type, 0);
758 }
759
760 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
761                                      struct dlm_lock_resource *res,
762                                      struct dlm_lock *lock,
763                                      int flags)
764 {
765         return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
766                                       0, flags);
767 }
768
769 void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
770 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
771
772 u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
773 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
774 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
775
776
777 int dlm_nm_init(struct dlm_ctxt *dlm);
778 int dlm_heartbeat_init(struct dlm_ctxt *dlm);
779 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
780 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
781
782 int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
783 int dlm_migrate_lockres(struct dlm_ctxt *dlm,
784                         struct dlm_lock_resource *res,
785                         u8 target);
786 int dlm_finish_migration(struct dlm_ctxt *dlm,
787                          struct dlm_lock_resource *res,
788                          u8 old_master);
789 void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
790                              struct dlm_lock_resource *res);
791 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
792
793 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
794 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
795 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
796 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
797 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
798 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
799 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
800 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
801 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
802 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
803                           u8 nodenum, u8 *real_master);
804 int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
805                                struct dlm_lock_resource *res, u8 *real_master);
806
807
808 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
809                                struct dlm_lock_resource *res,
810                                int ignore_higher,
811                                u8 request_from,
812                                u32 flags);
813
814
815 int dlm_send_one_lockres(struct dlm_ctxt *dlm,
816                          struct dlm_lock_resource *res,
817                          struct dlm_migratable_lockres *mres,
818                          u8 send_to,
819                          u8 flags);
820 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
821                                        struct dlm_lock_resource *res);
822
823 /* will exit holding res->spinlock, but may drop in function */
824 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
825 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
826
827 /* will exit holding res->spinlock, but may drop in function */
828 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
829 {
830         __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
831                                           DLM_LOCK_RES_RECOVERING|
832                                           DLM_LOCK_RES_MIGRATING));
833 }
834
835
836 int dlm_init_mle_cache(void);
837 void dlm_destroy_mle_cache(void);
838 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
839 void dlm_clean_master_list(struct dlm_ctxt *dlm,
840                            u8 dead_node);
841 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
842
843
844 static inline const char * dlm_lock_mode_name(int mode)
845 {
846         switch (mode) {
847                 case LKM_EXMODE:
848                         return "EX";
849                 case LKM_PRMODE:
850                         return "PR";
851                 case LKM_NLMODE:
852                         return "NL";
853         }
854         return "UNKNOWN";
855 }
856
857
858 static inline int dlm_lock_compatible(int existing, int request)
859 {
860         /* NO_LOCK compatible with all */
861         if (request == LKM_NLMODE ||
862             existing == LKM_NLMODE)
863                 return 1;
864
865         /* EX incompatible with all non-NO_LOCK */
866         if (request == LKM_EXMODE)
867                 return 0;
868
869         /* request must be PR, which is compatible with PR */
870         if (existing == LKM_PRMODE)
871                 return 1;
872
873         return 0;
874 }
875
876 static inline int dlm_lock_on_list(struct list_head *head,
877                                    struct dlm_lock *lock)
878 {
879         struct list_head *iter;
880         struct dlm_lock *tmplock;
881
882         list_for_each(iter, head) {
883                 tmplock = list_entry(iter, struct dlm_lock, list);
884                 if (tmplock == lock)
885                         return 1;
886         }
887         return 0;
888 }
889
890
891 static inline enum dlm_status dlm_err_to_dlm_status(int err)
892 {
893         enum dlm_status ret;
894         if (err == -ENOMEM)
895                 ret = DLM_SYSERR;
896         else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
897                 ret = DLM_NOLOCKMGR;
898         else if (err == -EINVAL)
899                 ret = DLM_BADPARAM;
900         else if (err == -ENAMETOOLONG)
901                 ret = DLM_IVBUFLEN;
902         else
903                 ret = DLM_BADARGS;
904         return ret;
905 }
906
907
908 static inline void dlm_node_iter_init(unsigned long *map,
909                                       struct dlm_node_iter *iter)
910 {
911         memcpy(iter->node_map, map, sizeof(iter->node_map));
912         iter->curnode = -1;
913 }
914
915 static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
916 {
917         int bit;
918         bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
919         if (bit >= O2NM_MAX_NODES) {
920                 iter->curnode = O2NM_MAX_NODES;
921                 return -ENOENT;
922         }
923         iter->curnode = bit;
924         return bit;
925 }
926
927
928
929 #endif /* DLMCOMMON_H */