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ocfs2: calculate lockid hash values outside of the spinlock
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ocfs2 / dlm / dlmcommon.h
CommitLineData
6714d8e8
KH		 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
81f2094a 40#define DLM_HASH_BUCKETS (PAGE_SIZE / sizeof(struct hlist_head))
6714d8e8 41
a3d33291
MF		 42/* Intended to make it easier for us to switch out hash functions */
43#define dlm_lockid_hash(_n, _l) full_name_hash(_n, _l)
44
6714d8e8
KH		 45enum dlm_ast_type {
46 DLM_AST = 0,
47 DLM_BAST,
48 DLM_ASTUNLOCK
49};
50
51
52#define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
53 LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
54 LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
55
56#define DLM_RECOVERY_LOCK_NAME "$RECOVERY"
57#define DLM_RECOVERY_LOCK_NAME_LEN 9
58
59static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
60{
61 if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
62 memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
63 return 1;
64 return 0;
65}
66
67#define DLM_RECO_STATE_ACTIVE 0x0001
68
69struct dlm_recovery_ctxt
70{
71 struct list_head resources;
72 struct list_head received;
73 struct list_head node_data;
74 u8 new_master;
75 u8 dead_node;
76 u16 state;
77 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
78 wait_queue_head_t event;
79};
80
81enum dlm_ctxt_state {
82 DLM_CTXT_NEW = 0,
83 DLM_CTXT_JOINED,
84 DLM_CTXT_IN_SHUTDOWN,
85 DLM_CTXT_LEAVING,
86};
87
88struct dlm_ctxt
89{
90 struct list_head list;
81f2094a 91 struct hlist_head *lockres_hash;
6714d8e8
KH		 92 struct list_head dirty_list;
93 struct list_head purge_list;
94 struct list_head pending_asts;
95 struct list_head pending_basts;
96 unsigned int purge_count;
97 spinlock_t spinlock;
98 spinlock_t ast_lock;
99 char *name;
100 u8 node_num;
101 u32 key;
102 u8 joining_node;
103 wait_queue_head_t dlm_join_events;
104 unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
105 unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
106 unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
107 struct dlm_recovery_ctxt reco;
108 spinlock_t master_lock;
109 struct list_head master_list;
110 struct list_head mle_hb_events;
111
112 /* these give a really vague idea of the system load */
113 atomic_t local_resources;
114 atomic_t remote_resources;
115 atomic_t unknown_resources;
116
117 /* NOTE: Next three are protected by dlm_domain_lock */
118 struct kref dlm_refs;
119 enum dlm_ctxt_state dlm_state;
120 unsigned int num_joins;
121
122 struct o2hb_callback_func dlm_hb_up;
123 struct o2hb_callback_func dlm_hb_down;
124 struct task_struct *dlm_thread_task;
125 struct task_struct *dlm_reco_thread_task;
126 wait_queue_head_t dlm_thread_wq;
127 wait_queue_head_t dlm_reco_thread_wq;
128 wait_queue_head_t ast_wq;
129 wait_queue_head_t migration_wq;
130
131 struct work_struct dispatched_work;
132 struct list_head work_list;
133 spinlock_t work_lock;
134 struct list_head dlm_domain_handlers;
135 struct list_head dlm_eviction_callbacks;
136};
137
138/* these keventd work queue items are for less-frequently
139 * called functions that cannot be directly called from the
140 * net message handlers for some reason, usually because
141 * they need to send net messages of their own. */
142void dlm_dispatch_work(void *data);
143
144struct dlm_lock_resource;
145struct dlm_work_item;
146
147typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
148
149struct dlm_request_all_locks_priv
150{
151 u8 reco_master;
152 u8 dead_node;
153};
154
155struct dlm_mig_lockres_priv
156{
157 struct dlm_lock_resource *lockres;
158 u8 real_master;
159};
160
161struct dlm_assert_master_priv
162{
163 struct dlm_lock_resource *lockres;
164 u8 request_from;
165 u32 flags;
166 unsigned ignore_higher:1;
167};
168
169
170struct dlm_work_item
171{
172 struct list_head list;
173 dlm_workfunc_t *func;
174 struct dlm_ctxt *dlm;
175 void *data;
176 union {
177 struct dlm_request_all_locks_priv ral;
178 struct dlm_mig_lockres_priv ml;
179 struct dlm_assert_master_priv am;
180 } u;
181};
182
183static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
184 struct dlm_work_item *i,
185 dlm_workfunc_t *f, void *data)
186{
187 memset(i, 0, sizeof(*i));
188 i->func = f;
189 INIT_LIST_HEAD(&i->list);
190 i->data = data;
191 i->dlm = dlm; /* must have already done a dlm_grab on this! */
192}
193
194
195
196static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
197 u8 node)
198{
199 assert_spin_locked(&dlm->spinlock);
200
201 dlm->joining_node = node;
202 wake_up(&dlm->dlm_join_events);
203}
204
205#define DLM_LOCK_RES_UNINITED 0x00000001
206#define DLM_LOCK_RES_RECOVERING 0x00000002
207#define DLM_LOCK_RES_READY 0x00000004
208#define DLM_LOCK_RES_DIRTY 0x00000008
209#define DLM_LOCK_RES_IN_PROGRESS 0x00000010
210#define DLM_LOCK_RES_MIGRATING 0x00000020
211
44465a7d
KH		 212/* max milliseconds to wait to sync up a network failure with a node death */
213#define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
214
6714d8e8
KH		 215#define DLM_PURGE_INTERVAL_MS (8 * 1000)
216
217struct dlm_lock_resource
218{
219 /* WARNING: Please see the comment in dlm_init_lockres before
220 * adding fields here. */
81f2094a 221 struct hlist_node hash_node;
65c491d8 222 struct qstr lockname;
6714d8e8
KH		 223 struct kref refs;
224
225 /* please keep these next 3 in this order
226 * some funcs want to iterate over all lists */
227 struct list_head granted;
228 struct list_head converting;
229 struct list_head blocked;
230
231 struct list_head dirty;
232 struct list_head recovering; // dlm_recovery_ctxt.resources list
233
234 /* unused lock resources have their last_used stamped and are
235 * put on a list for the dlm thread to run. */
236 struct list_head purge;
237 unsigned long last_used;
238
239 unsigned migration_pending:1;
240 atomic_t asts_reserved;
241 spinlock_t spinlock;
242 wait_queue_head_t wq;
243 u8 owner; //node which owns the lock resource, or unknown
244 u16 state;
6714d8e8
KH		 245 char lvb[DLM_LVB_LEN];
246};
247
248struct dlm_migratable_lock
249{
250 __be64 cookie;
251
252 /* these 3 are just padding for the in-memory structure, but
253 * list and flags are actually used when sent over the wire */
254 __be16 pad1;
255 u8 list; // 0=granted, 1=converting, 2=blocked
256 u8 flags;
257
258 s8 type;
259 s8 convert_type;
260 s8 highest_blocked;
261 u8 node;
262}; // 16 bytes
263
264struct dlm_lock
265{
266 struct dlm_migratable_lock ml;
267
268 struct list_head list;
269 struct list_head ast_list;
270 struct list_head bast_list;
271 struct dlm_lock_resource *lockres;
272 spinlock_t spinlock;
273 struct kref lock_refs;
274
275 // ast and bast must be callable while holding a spinlock!
276 dlm_astlockfunc_t *ast;
277 dlm_bastlockfunc_t *bast;
278 void *astdata;
279 struct dlm_lockstatus *lksb;
280 unsigned ast_pending:1,
281 bast_pending:1,
282 convert_pending:1,
283 lock_pending:1,
284 cancel_pending:1,
285 unlock_pending:1,
286 lksb_kernel_allocated:1;
287};
288
289
290#define DLM_LKSB_UNUSED1 0x01
291#define DLM_LKSB_PUT_LVB 0x02
292#define DLM_LKSB_GET_LVB 0x04
293#define DLM_LKSB_UNUSED2 0x08
294#define DLM_LKSB_UNUSED3 0x10
295#define DLM_LKSB_UNUSED4 0x20
296#define DLM_LKSB_UNUSED5 0x40
297#define DLM_LKSB_UNUSED6 0x80
298
299
300enum dlm_lockres_list {
301 DLM_GRANTED_LIST = 0,
302 DLM_CONVERTING_LIST,
303 DLM_BLOCKED_LIST
304};
305
306static inline struct list_head *
307dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
308{
309 struct list_head *ret = NULL;
310 if (idx == DLM_GRANTED_LIST)
311 ret = &res->granted;
312 else if (idx == DLM_CONVERTING_LIST)
313 ret = &res->converting;
314 else if (idx == DLM_BLOCKED_LIST)
315 ret = &res->blocked;
316 else
317 BUG();
318 return ret;
319}
320
321
322
323
324struct dlm_node_iter
325{
326 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
327 int curnode;
328};
329
330
331enum {
332 DLM_MASTER_REQUEST_MSG = 500,
333 DLM_UNUSED_MSG1, /* 501 */
334 DLM_ASSERT_MASTER_MSG, /* 502 */
335 DLM_CREATE_LOCK_MSG, /* 503 */
336 DLM_CONVERT_LOCK_MSG, /* 504 */
337 DLM_PROXY_AST_MSG, /* 505 */
338 DLM_UNLOCK_LOCK_MSG, /* 506 */
339 DLM_UNUSED_MSG2, /* 507 */
340 DLM_MIGRATE_REQUEST_MSG, /* 508 */
341 DLM_MIG_LOCKRES_MSG, /* 509 */
342 DLM_QUERY_JOIN_MSG, /* 510 */
343 DLM_ASSERT_JOINED_MSG, /* 511 */
344 DLM_CANCEL_JOIN_MSG, /* 512 */
345 DLM_EXIT_DOMAIN_MSG, /* 513 */
346 DLM_MASTER_REQUERY_MSG, /* 514 */
347 DLM_LOCK_REQUEST_MSG, /* 515 */
348 DLM_RECO_DATA_DONE_MSG, /* 516 */
349 DLM_BEGIN_RECO_MSG, /* 517 */
350 DLM_FINALIZE_RECO_MSG /* 518 */
351};
352
353struct dlm_reco_node_data
354{
355 int state;
356 u8 node_num;
357 struct list_head list;
358};
359
360enum {
361 DLM_RECO_NODE_DATA_DEAD = -1,
362 DLM_RECO_NODE_DATA_INIT = 0,
363 DLM_RECO_NODE_DATA_REQUESTING,
364 DLM_RECO_NODE_DATA_REQUESTED,
365 DLM_RECO_NODE_DATA_RECEIVING,
366 DLM_RECO_NODE_DATA_DONE,
367 DLM_RECO_NODE_DATA_FINALIZE_SENT,
368};
369
370
371enum {
372 DLM_MASTER_RESP_NO = 0,
373 DLM_MASTER_RESP_YES,
374 DLM_MASTER_RESP_MAYBE,
375 DLM_MASTER_RESP_ERROR
376};
377
378
379struct dlm_master_request
380{
381 u8 node_idx;
382 u8 namelen;
383 __be16 pad1;
384 __be32 flags;
385
386 u8 name[O2NM_MAX_NAME_LEN];
387};
388
389#define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
390#define DLM_ASSERT_MASTER_REQUERY 0x00000002
391#define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
392struct dlm_assert_master
393{
394 u8 node_idx;
395 u8 namelen;
396 __be16 pad1;
397 __be32 flags;
398
399 u8 name[O2NM_MAX_NAME_LEN];
400};
401
402struct dlm_migrate_request
403{
404 u8 master;
405 u8 new_master;
406 u8 namelen;
407 u8 pad1;
408 __be32 pad2;
409 u8 name[O2NM_MAX_NAME_LEN];
410};
411
412struct dlm_master_requery
413{
414 u8 pad1;
415 u8 pad2;
416 u8 node_idx;
417 u8 namelen;
418 __be32 pad3;
419 u8 name[O2NM_MAX_NAME_LEN];
420};
421
422#define DLM_MRES_RECOVERY 0x01
423#define DLM_MRES_MIGRATION 0x02
424#define DLM_MRES_ALL_DONE 0x04
425
426/*
427 * We would like to get one whole lockres into a single network
428 * message whenever possible. Generally speaking, there will be
429 * at most one dlm_lock on a lockres for each node in the cluster,
430 * plus (infrequently) any additional locks coming in from userdlm.
431 *
432 * struct _dlm_lockres_page
433 * {
434 * dlm_migratable_lockres mres;
435 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
436 * u8 pad[DLM_MIG_LOCKRES_RESERVED];
437 * };
438 *
439 * from ../cluster/tcp.h
440 * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
441 * (roughly 4080 bytes)
442 * and sizeof(dlm_migratable_lockres) = 112 bytes
443 * and sizeof(dlm_migratable_lock) = 16 bytes
444 *
445 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
446 * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
447 *
448 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
449 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
450 * NET_MAX_PAYLOAD_BYTES
451 * (240 * 16) + 112 + 128 = 4080
452 *
453 * So a lockres would need more than 240 locks before it would
454 * use more than one network packet to recover. Not too bad.
455 */
456#define DLM_MAX_MIGRATABLE_LOCKS 240
457
458struct dlm_migratable_lockres
459{
460 u8 master;
461 u8 lockname_len;
462 u8 num_locks; // locks sent in this structure
463 u8 flags;
464 __be32 total_locks; // locks to be sent for this migration cookie
465 __be64 mig_cookie; // cookie for this lockres migration
466 // or zero if not needed
467 // 16 bytes
468 u8 lockname[DLM_LOCKID_NAME_MAX];
469 // 48 bytes
470 u8 lvb[DLM_LVB_LEN];
471 // 112 bytes
472 struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112
473};
474#define DLM_MIG_LOCKRES_MAX_LEN \
475 (sizeof(struct dlm_migratable_lockres) + \
476 (sizeof(struct dlm_migratable_lock) * \
477 DLM_MAX_MIGRATABLE_LOCKS) )
478
479/* from above, 128 bytes
480 * for some undetermined future use */
481#define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \
482 DLM_MIG_LOCKRES_MAX_LEN)
483
484struct dlm_create_lock
485{
486 __be64 cookie;
487
488 __be32 flags;
489 u8 pad1;
490 u8 node_idx;
491 s8 requested_type;
492 u8 namelen;
493
494 u8 name[O2NM_MAX_NAME_LEN];
495};
496
497struct dlm_convert_lock
498{
499 __be64 cookie;
500
501 __be32 flags;
502 u8 pad1;
503 u8 node_idx;
504 s8 requested_type;
505 u8 namelen;
506
507 u8 name[O2NM_MAX_NAME_LEN];
508
509 s8 lvb[0];
510};
511#define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
512
513struct dlm_unlock_lock
514{
515 __be64 cookie;
516
517 __be32 flags;
518 __be16 pad1;
519 u8 node_idx;
520 u8 namelen;
521
522 u8 name[O2NM_MAX_NAME_LEN];
523
524 s8 lvb[0];
525};
526#define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
527
528struct dlm_proxy_ast
529{
530 __be64 cookie;
531
532 __be32 flags;
533 u8 node_idx;
534 u8 type;
535 u8 blocked_type;
536 u8 namelen;
537
538 u8 name[O2NM_MAX_NAME_LEN];
539
540 s8 lvb[0];
541};
542#define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
543
544#define DLM_MOD_KEY (0x666c6172)
545enum dlm_query_join_response {
546 JOIN_DISALLOW = 0,
547 JOIN_OK,
548 JOIN_OK_NO_MAP,
549};
550
551struct dlm_lock_request
552{
553 u8 node_idx;
554 u8 dead_node;
555 __be16 pad1;
556 __be32 pad2;
557};
558
559struct dlm_reco_data_done
560{
561 u8 node_idx;
562 u8 dead_node;
563 __be16 pad1;
564 __be32 pad2;
565
566 /* unused for now */
567 /* eventually we can use this to attempt
568 * lvb recovery based on each node's info */
569 u8 reco_lvb[DLM_LVB_LEN];
570};
571
572struct dlm_begin_reco
573{
574 u8 node_idx;
575 u8 dead_node;
576 __be16 pad1;
577 __be32 pad2;
578};
579
580
581struct dlm_query_join_request
582{
583 u8 node_idx;
584 u8 pad1[2];
585 u8 name_len;
586 u8 domain[O2NM_MAX_NAME_LEN];
587};
588
589struct dlm_assert_joined
590{
591 u8 node_idx;
592 u8 pad1[2];
593 u8 name_len;
594 u8 domain[O2NM_MAX_NAME_LEN];
595};
596
597struct dlm_cancel_join
598{
599 u8 node_idx;
600 u8 pad1[2];
601 u8 name_len;
602 u8 domain[O2NM_MAX_NAME_LEN];
603};
604
605struct dlm_exit_domain
606{
607 u8 node_idx;
608 u8 pad1[3];
609};
610
611struct dlm_finalize_reco
612{
613 u8 node_idx;
614 u8 dead_node;
615 __be16 pad1;
616 __be32 pad2;
617};
618
619static inline enum dlm_status
620__dlm_lockres_state_to_status(struct dlm_lock_resource *res)
621{
622 enum dlm_status status = DLM_NORMAL;
623
624 assert_spin_locked(&res->spinlock);
625
626 if (res->state & DLM_LOCK_RES_RECOVERING)
627 status = DLM_RECOVERING;
628 else if (res->state & DLM_LOCK_RES_MIGRATING)
629 status = DLM_MIGRATING;
630 else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
631 status = DLM_FORWARD;
632
633 return status;
634}
635
29004858
KH		 636static inline u8 dlm_get_lock_cookie_node(u64 cookie)
637{
638 u8 ret;
639 cookie >>= 56;
640 ret = (u8)(cookie & 0xffULL);
641 return ret;
642}
643
644static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
645{
646 unsigned long long ret;
647 ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
648 return ret;
649}
650
6714d8e8
KH		 651struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
652 struct dlm_lockstatus *lksb);
653void dlm_lock_get(struct dlm_lock *lock);
654void dlm_lock_put(struct dlm_lock *lock);
655
656void dlm_lock_attach_lockres(struct dlm_lock *lock,
657 struct dlm_lock_resource *res);
658
659int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
660int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
661int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
662
663void dlm_revert_pending_convert(struct dlm_lock_resource *res,
664 struct dlm_lock *lock);
665void dlm_revert_pending_lock(struct dlm_lock_resource *res,
666 struct dlm_lock *lock);
667
668int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
669void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
670 struct dlm_lock *lock);
671void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
672 struct dlm_lock *lock);
673
674int dlm_launch_thread(struct dlm_ctxt *dlm);
675void dlm_complete_thread(struct dlm_ctxt *dlm);
676int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
677void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
678void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
c03872f5 679void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
e2faea4c 680int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
44465a7d 681int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
6714d8e8
KH		 682
683void dlm_put(struct dlm_ctxt *dlm);
684struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
685int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
686
687void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
688 struct dlm_lock_resource *res);
689void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
690 struct dlm_lock_resource *res);
691void dlm_purge_lockres(struct dlm_ctxt *dlm,
692 struct dlm_lock_resource *lockres);
693void dlm_lockres_get(struct dlm_lock_resource *res);
694void dlm_lockres_put(struct dlm_lock_resource *res);
695void __dlm_unhash_lockres(struct dlm_lock_resource *res);
696void __dlm_insert_lockres(struct dlm_ctxt *dlm,
697 struct dlm_lock_resource *res);
698struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
699 const char *name,
a3d33291
MF		 700 unsigned int len,
701 unsigned int hash);
6714d8e8
KH		 702struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
703 const char *name,
704 unsigned int len);
705
706int dlm_is_host_down(int errno);
707void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
708 struct dlm_lock_resource *res,
709 u8 owner);
710struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
711 const char *lockid,
712 int flags);
713struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
714 const char *name,
715 unsigned int namelen);
716
717void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
718void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
719void dlm_do_local_ast(struct dlm_ctxt *dlm,
720 struct dlm_lock_resource *res,
721 struct dlm_lock *lock);
722int dlm_do_remote_ast(struct dlm_ctxt *dlm,
723 struct dlm_lock_resource *res,
724 struct dlm_lock *lock);
725void dlm_do_local_bast(struct dlm_ctxt *dlm,
726 struct dlm_lock_resource *res,
727 struct dlm_lock *lock,
728 int blocked_type);
729int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
730 struct dlm_lock_resource *res,
731 struct dlm_lock *lock,
732 int msg_type,
733 int blocked_type, int flags);
734static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
735 struct dlm_lock_resource *res,
736 struct dlm_lock *lock,
737 int blocked_type)
738{
739 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
740 blocked_type, 0);
741}
742
743static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
744 struct dlm_lock_resource *res,
745 struct dlm_lock *lock,
746 int flags)
747{
748 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
749 0, flags);
750}
751
752void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
753void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
754
755u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
756void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
757void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
758
759
760int dlm_nm_init(struct dlm_ctxt *dlm);
761int dlm_heartbeat_init(struct dlm_ctxt *dlm);
762void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
763void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
764
765int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
766int dlm_migrate_lockres(struct dlm_ctxt *dlm,
767 struct dlm_lock_resource *res,
768 u8 target);
769int dlm_finish_migration(struct dlm_ctxt *dlm,
770 struct dlm_lock_resource *res,
771 u8 old_master);
772void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
773 struct dlm_lock_resource *res);
774void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
775
776int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
777int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
778int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
779int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
780int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
781int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
782int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
783int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
784int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
c03872f5
KH		 785int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
786 u8 nodenum, u8 *real_master);
787int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
788 struct dlm_lock_resource *res, u8 *real_master);
789
6714d8e8
KH		 790
791int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
792 struct dlm_lock_resource *res,
793 int ignore_higher,
794 u8 request_from,
795 u32 flags);
796
797
798int dlm_send_one_lockres(struct dlm_ctxt *dlm,
799 struct dlm_lock_resource *res,
800 struct dlm_migratable_lockres *mres,
801 u8 send_to,
802 u8 flags);
803void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
804 struct dlm_lock_resource *res);
805
806/* will exit holding res->spinlock, but may drop in function */
807void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
808void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
809
810/* will exit holding res->spinlock, but may drop in function */
811static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
812{
813 __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
814 DLM_LOCK_RES_RECOVERING|
815 DLM_LOCK_RES_MIGRATING));
816}
817
818
819int dlm_init_mle_cache(void);
820void dlm_destroy_mle_cache(void);
821void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
822void dlm_clean_master_list(struct dlm_ctxt *dlm,
823 u8 dead_node);
824int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
825
826
827static inline const char * dlm_lock_mode_name(int mode)
828{
829 switch (mode) {
830 case LKM_EXMODE:
831 return "EX";
832 case LKM_PRMODE:
833 return "PR";
834 case LKM_NLMODE:
835 return "NL";
836 }
837 return "UNKNOWN";
838}
839
840
841static inline int dlm_lock_compatible(int existing, int request)
842{
843 /* NO_LOCK compatible with all */
844 if (request == LKM_NLMODE ||
845 existing == LKM_NLMODE)
846 return 1;
847
848 /* EX incompatible with all non-NO_LOCK */
849 if (request == LKM_EXMODE)
850 return 0;
851
852 /* request must be PR, which is compatible with PR */
853 if (existing == LKM_PRMODE)
854 return 1;
855
856 return 0;
857}
858
859static inline int dlm_lock_on_list(struct list_head *head,
860 struct dlm_lock *lock)
861{
862 struct list_head *iter;
863 struct dlm_lock *tmplock;
864
865 list_for_each(iter, head) {
866 tmplock = list_entry(iter, struct dlm_lock, list);
867 if (tmplock == lock)
868 return 1;
869 }
870 return 0;
871}
872
873
874static inline enum dlm_status dlm_err_to_dlm_status(int err)
875{
876 enum dlm_status ret;
877 if (err == -ENOMEM)
878 ret = DLM_SYSERR;
879 else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
880 ret = DLM_NOLOCKMGR;
881 else if (err == -EINVAL)
882 ret = DLM_BADPARAM;
883 else if (err == -ENAMETOOLONG)
884 ret = DLM_IVBUFLEN;
885 else
886 ret = DLM_BADARGS;
887 return ret;
888}
889
890
891static inline void dlm_node_iter_init(unsigned long *map,
892 struct dlm_node_iter *iter)
893{
894 memcpy(iter->node_map, map, sizeof(iter->node_map));
895 iter->curnode = -1;
896}
897
898static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
899{
900 int bit;
901 bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
902 if (bit >= O2NM_MAX_NODES) {
903 iter->curnode = O2NM_MAX_NODES;
904 return -ENOENT;
905 }
906 iter->curnode = bit;
907 return bit;
908}
909
910
911
912#endif /* DLMCOMMON_H */
kernel source for telekom puls (alcatel/mediatek)