1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * dlmcommon.h
4 *
5 * Copyright (C) 2004 Oracle. All rights reserved.
6 */
7
8 #ifndef DLMCOMMON_H
9 #define DLMCOMMON_H
10
11 #include <linux/kref.h>
12
13 #define DLM_HB_NODE_DOWN_PRI (0xf000000)
14 #define DLM_HB_NODE_UP_PRI (0x8000000)
15
16 #define DLM_LOCKID_NAME_MAX 32
17
18 #define DLM_LOCK_RES_OWNER_UNKNOWN O2NM_MAX_NODES
19
20 #define DLM_HASH_SIZE_DEFAULT (1 << 17)
21 #if DLM_HASH_SIZE_DEFAULT < PAGE_SIZE
22 # define DLM_HASH_PAGES 1
23 #else
24 # define DLM_HASH_PAGES (DLM_HASH_SIZE_DEFAULT / PAGE_SIZE)
25 #endif
26 #define DLM_BUCKETS_PER_PAGE (PAGE_SIZE / sizeof(struct hlist_head))
27 #define DLM_HASH_BUCKETS (DLM_HASH_PAGES * DLM_BUCKETS_PER_PAGE)
28
29 /* Intended to make it easier for us to switch out hash functions */
30 #define dlm_lockid_hash(_n, _l) full_name_hash(NULL, _n, _l)
31
32 enum dlm_mle_type {
33 DLM_MLE_BLOCK = 0,
34 DLM_MLE_MASTER = 1,
35 DLM_MLE_MIGRATION = 2,
36 DLM_MLE_NUM_TYPES = 3,
37 };
38
39 struct dlm_master_list_entry {
40 struct hlist_node master_hash_node;
41 struct list_head hb_events;
42 struct dlm_ctxt *dlm;
43 spinlock_t spinlock;
44 wait_queue_head_t wq;
45 atomic_t woken;
46 struct kref mle_refs;
47 int inuse;
48 unsigned long maybe_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
49 unsigned long vote_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
50 unsigned long response_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
51 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
52 u8 master;
53 u8 new_master;
54 enum dlm_mle_type type;
55 struct o2hb_callback_func mle_hb_up;
56 struct o2hb_callback_func mle_hb_down;
57 struct dlm_lock_resource *mleres;
58 unsigned char mname[DLM_LOCKID_NAME_MAX];
59 unsigned int mnamelen;
60 unsigned int mnamehash;
61 };
62
63 enum dlm_ast_type {
64 DLM_AST = 0,
65 DLM_BAST = 1,
66 DLM_ASTUNLOCK = 2,
67 };
68
69
70 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
71 LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
72 LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
73
74 #define DLM_RECOVERY_LOCK_NAME "$RECOVERY"
75 #define DLM_RECOVERY_LOCK_NAME_LEN 9
76
dlm_is_recovery_lock(const char * lock_name,int name_len)77 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
78 {
79 if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
80 memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
81 return 1;
82 return 0;
83 }
84
85 #define DLM_RECO_STATE_ACTIVE 0x0001
86 #define DLM_RECO_STATE_FINALIZE 0x0002
87
88 struct dlm_recovery_ctxt
89 {
90 struct list_head resources;
91 struct list_head node_data;
92 u8 new_master;
93 u8 dead_node;
94 u16 state;
95 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
96 wait_queue_head_t event;
97 };
98
99 enum dlm_ctxt_state {
100 DLM_CTXT_NEW = 0,
101 DLM_CTXT_JOINED = 1,
102 DLM_CTXT_IN_SHUTDOWN = 2,
103 DLM_CTXT_LEAVING = 3,
104 };
105
106 struct dlm_ctxt
107 {
108 struct list_head list;
109 struct hlist_head **lockres_hash;
110 struct list_head dirty_list;
111 struct list_head purge_list;
112 struct list_head pending_asts;
113 struct list_head pending_basts;
114 struct list_head tracking_list;
115 unsigned int purge_count;
116 spinlock_t spinlock;
117 spinlock_t ast_lock;
118 spinlock_t track_lock;
119 char *name;
120 u8 node_num;
121 u32 key;
122 u8 joining_node;
123 u8 migrate_done; /* set to 1 means node has migrated all lock resources */
124 wait_queue_head_t dlm_join_events;
125 unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
126 unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
127 unsigned long exit_domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
128 unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
129 struct dlm_recovery_ctxt reco;
130 spinlock_t master_lock;
131 struct hlist_head **master_hash;
132 struct list_head mle_hb_events;
133
134 /* these give a really vague idea of the system load */
135 atomic_t mle_tot_count[DLM_MLE_NUM_TYPES];
136 atomic_t mle_cur_count[DLM_MLE_NUM_TYPES];
137 atomic_t res_tot_count;
138 atomic_t res_cur_count;
139
140 struct dentry *dlm_debugfs_subroot;
141
142 /* NOTE: Next three are protected by dlm_domain_lock */
143 struct kref dlm_refs;
144 enum dlm_ctxt_state dlm_state;
145 unsigned int num_joins;
146
147 struct o2hb_callback_func dlm_hb_up;
148 struct o2hb_callback_func dlm_hb_down;
149 struct task_struct *dlm_thread_task;
150 struct task_struct *dlm_reco_thread_task;
151 struct workqueue_struct *dlm_worker;
152 wait_queue_head_t dlm_thread_wq;
153 wait_queue_head_t dlm_reco_thread_wq;
154 wait_queue_head_t ast_wq;
155 wait_queue_head_t migration_wq;
156
157 struct work_struct dispatched_work;
158 struct list_head work_list;
159 spinlock_t work_lock;
160 struct list_head dlm_domain_handlers;
161 struct list_head dlm_eviction_callbacks;
162
163 /* The filesystem specifies this at domain registration. We
164 * cache it here to know what to tell other nodes. */
165 struct dlm_protocol_version fs_locking_proto;
166 /* This is the inter-dlm communication version */
167 struct dlm_protocol_version dlm_locking_proto;
168 };
169
dlm_lockres_hash(struct dlm_ctxt * dlm,unsigned i)170 static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
171 {
172 return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE);
173 }
174
dlm_master_hash(struct dlm_ctxt * dlm,unsigned i)175 static inline struct hlist_head *dlm_master_hash(struct dlm_ctxt *dlm,
176 unsigned i)
177 {
178 return dlm->master_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] +
179 (i % DLM_BUCKETS_PER_PAGE);
180 }
181
182 /* these keventd work queue items are for less-frequently
183 * called functions that cannot be directly called from the
184 * net message handlers for some reason, usually because
185 * they need to send net messages of their own. */
186 void dlm_dispatch_work(struct work_struct *work);
187
188 struct dlm_lock_resource;
189 struct dlm_work_item;
190
191 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
192
193 struct dlm_request_all_locks_priv
194 {
195 u8 reco_master;
196 u8 dead_node;
197 };
198
199 struct dlm_mig_lockres_priv
200 {
201 struct dlm_lock_resource *lockres;
202 u8 real_master;
203 u8 extra_ref;
204 };
205
206 struct dlm_assert_master_priv
207 {
208 struct dlm_lock_resource *lockres;
209 u8 request_from;
210 u32 flags;
211 unsigned ignore_higher:1;
212 };
213
214 struct dlm_deref_lockres_priv
215 {
216 struct dlm_lock_resource *deref_res;
217 u8 deref_node;
218 };
219
220 struct dlm_work_item
221 {
222 struct list_head list;
223 dlm_workfunc_t *func;
224 struct dlm_ctxt *dlm;
225 void *data;
226 union {
227 struct dlm_request_all_locks_priv ral;
228 struct dlm_mig_lockres_priv ml;
229 struct dlm_assert_master_priv am;
230 struct dlm_deref_lockres_priv dl;
231 } u;
232 };
233
dlm_init_work_item(struct dlm_ctxt * dlm,struct dlm_work_item * i,dlm_workfunc_t * f,void * data)234 static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
235 struct dlm_work_item *i,
236 dlm_workfunc_t *f, void *data)
237 {
238 memset(i, 0, sizeof(*i));
239 i->func = f;
240 INIT_LIST_HEAD(&i->list);
241 i->data = data;
242 i->dlm = dlm; /* must have already done a dlm_grab on this! */
243 }
244
245
246
__dlm_set_joining_node(struct dlm_ctxt * dlm,u8 node)247 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
248 u8 node)
249 {
250 assert_spin_locked(&dlm->spinlock);
251
252 dlm->joining_node = node;
253 wake_up(&dlm->dlm_join_events);
254 }
255
256 #define DLM_LOCK_RES_UNINITED 0x00000001
257 #define DLM_LOCK_RES_RECOVERING 0x00000002
258 #define DLM_LOCK_RES_READY 0x00000004
259 #define DLM_LOCK_RES_DIRTY 0x00000008
260 #define DLM_LOCK_RES_IN_PROGRESS 0x00000010
261 #define DLM_LOCK_RES_MIGRATING 0x00000020
262 #define DLM_LOCK_RES_DROPPING_REF 0x00000040
263 #define DLM_LOCK_RES_BLOCK_DIRTY 0x00001000
264 #define DLM_LOCK_RES_SETREF_INPROG 0x00002000
265 #define DLM_LOCK_RES_RECOVERY_WAITING 0x00004000
266
267 /* max milliseconds to wait to sync up a network failure with a node death */
268 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
269
270 #define DLM_PURGE_INTERVAL_MS (8 * 1000)
271
272 struct dlm_lock_resource
273 {
274 /* WARNING: Please see the comment in dlm_init_lockres before
275 * adding fields here. */
276 struct hlist_node hash_node;
277 struct qstr lockname;
278 struct kref refs;
279
280 /*
281 * Please keep granted, converting, and blocked in this order,
282 * as some funcs want to iterate over all lists.
283 *
284 * All four lists are protected by the hash's reference.
285 */
286 struct list_head granted;
287 struct list_head converting;
288 struct list_head blocked;
289 struct list_head purge;
290
291 /*
292 * These two lists require you to hold an additional reference
293 * while they are on the list.
294 */
295 struct list_head dirty;
296 struct list_head recovering; // dlm_recovery_ctxt.resources list
297
298 /* Added during init and removed during release */
299 struct list_head tracking; /* dlm->tracking_list */
300
301 /* unused lock resources have their last_used stamped and are
302 * put on a list for the dlm thread to run. */
303 unsigned long last_used;
304
305 struct dlm_ctxt *dlm;
306
307 unsigned migration_pending:1;
308 atomic_t asts_reserved;
309 spinlock_t spinlock;
310 wait_queue_head_t wq;
311 u8 owner; //node which owns the lock resource, or unknown
312 u16 state;
313 char lvb[DLM_LVB_LEN];
314 unsigned int inflight_locks;
315 unsigned int inflight_assert_workers;
316 unsigned long refmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
317 };
318
319 struct dlm_migratable_lock
320 {
321 __be64 cookie;
322
323 /* these 3 are just padding for the in-memory structure, but
324 * list and flags are actually used when sent over the wire */
325 __be16 pad1;
326 u8 list; // 0=granted, 1=converting, 2=blocked
327 u8 flags;
328
329 s8 type;
330 s8 convert_type;
331 s8 highest_blocked;
332 u8 node;
333 }; // 16 bytes
334
335 struct dlm_lock
336 {
337 struct dlm_migratable_lock ml;
338
339 struct list_head list;
340 struct list_head ast_list;
341 struct list_head bast_list;
342 struct dlm_lock_resource *lockres;
343 spinlock_t spinlock;
344 struct kref lock_refs;
345
346 // ast and bast must be callable while holding a spinlock!
347 dlm_astlockfunc_t *ast;
348 dlm_bastlockfunc_t *bast;
349 void *astdata;
350 struct dlm_lockstatus *lksb;
351 unsigned ast_pending:1,
352 bast_pending:1,
353 convert_pending:1,
354 lock_pending:1,
355 cancel_pending:1,
356 unlock_pending:1,
357 lksb_kernel_allocated:1;
358 };
359
360 enum dlm_lockres_list {
361 DLM_GRANTED_LIST = 0,
362 DLM_CONVERTING_LIST = 1,
363 DLM_BLOCKED_LIST = 2,
364 };
365
dlm_lvb_is_empty(char * lvb)366 static inline int dlm_lvb_is_empty(char *lvb)
367 {
368 int i;
369 for (i=0; i<DLM_LVB_LEN; i++)
370 if (lvb[i])
371 return 0;
372 return 1;
373 }
374
dlm_list_in_text(enum dlm_lockres_list idx)375 static inline char *dlm_list_in_text(enum dlm_lockres_list idx)
376 {
377 if (idx == DLM_GRANTED_LIST)
378 return "granted";
379 else if (idx == DLM_CONVERTING_LIST)
380 return "converting";
381 else if (idx == DLM_BLOCKED_LIST)
382 return "blocked";
383 else
384 return "unknown";
385 }
386
387 static inline struct list_head *
dlm_list_idx_to_ptr(struct dlm_lock_resource * res,enum dlm_lockres_list idx)388 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
389 {
390 struct list_head *ret = NULL;
391 if (idx == DLM_GRANTED_LIST)
392 ret = &res->granted;
393 else if (idx == DLM_CONVERTING_LIST)
394 ret = &res->converting;
395 else if (idx == DLM_BLOCKED_LIST)
396 ret = &res->blocked;
397 else
398 BUG();
399 return ret;
400 }
401
402
403
404
405 struct dlm_node_iter
406 {
407 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
408 int curnode;
409 };
410
411
412 enum {
413 DLM_MASTER_REQUEST_MSG = 500,
414 DLM_UNUSED_MSG1 = 501,
415 DLM_ASSERT_MASTER_MSG = 502,
416 DLM_CREATE_LOCK_MSG = 503,
417 DLM_CONVERT_LOCK_MSG = 504,
418 DLM_PROXY_AST_MSG = 505,
419 DLM_UNLOCK_LOCK_MSG = 506,
420 DLM_DEREF_LOCKRES_MSG = 507,
421 DLM_MIGRATE_REQUEST_MSG = 508,
422 DLM_MIG_LOCKRES_MSG = 509,
423 DLM_QUERY_JOIN_MSG = 510,
424 DLM_ASSERT_JOINED_MSG = 511,
425 DLM_CANCEL_JOIN_MSG = 512,
426 DLM_EXIT_DOMAIN_MSG = 513,
427 DLM_MASTER_REQUERY_MSG = 514,
428 DLM_LOCK_REQUEST_MSG = 515,
429 DLM_RECO_DATA_DONE_MSG = 516,
430 DLM_BEGIN_RECO_MSG = 517,
431 DLM_FINALIZE_RECO_MSG = 518,
432 DLM_QUERY_REGION = 519,
433 DLM_QUERY_NODEINFO = 520,
434 DLM_BEGIN_EXIT_DOMAIN_MSG = 521,
435 DLM_DEREF_LOCKRES_DONE = 522,
436 };
437
438 struct dlm_reco_node_data
439 {
440 int state;
441 u8 node_num;
442 struct list_head list;
443 };
444
445 enum {
446 DLM_RECO_NODE_DATA_DEAD = -1,
447 DLM_RECO_NODE_DATA_INIT = 0,
448 DLM_RECO_NODE_DATA_REQUESTING = 1,
449 DLM_RECO_NODE_DATA_REQUESTED = 2,
450 DLM_RECO_NODE_DATA_RECEIVING = 3,
451 DLM_RECO_NODE_DATA_DONE = 4,
452 DLM_RECO_NODE_DATA_FINALIZE_SENT = 5,
453 };
454
455
456 enum {
457 DLM_MASTER_RESP_NO = 0,
458 DLM_MASTER_RESP_YES = 1,
459 DLM_MASTER_RESP_MAYBE = 2,
460 DLM_MASTER_RESP_ERROR = 3,
461 };
462
463
464 struct dlm_master_request
465 {
466 u8 node_idx;
467 u8 namelen;
468 __be16 pad1;
469 __be32 flags;
470
471 u8 name[O2NM_MAX_NAME_LEN];
472 };
473
474 #define DLM_ASSERT_RESPONSE_REASSERT 0x00000001
475 #define DLM_ASSERT_RESPONSE_MASTERY_REF 0x00000002
476
477 #define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
478 #define DLM_ASSERT_MASTER_REQUERY 0x00000002
479 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
480 struct dlm_assert_master
481 {
482 u8 node_idx;
483 u8 namelen;
484 __be16 pad1;
485 __be32 flags;
486
487 u8 name[O2NM_MAX_NAME_LEN];
488 };
489
490 #define DLM_MIGRATE_RESPONSE_MASTERY_REF 0x00000001
491
492 struct dlm_migrate_request
493 {
494 u8 master;
495 u8 new_master;
496 u8 namelen;
497 u8 pad1;
498 __be32 pad2;
499 u8 name[O2NM_MAX_NAME_LEN];
500 };
501
502 struct dlm_master_requery
503 {
504 u8 pad1;
505 u8 pad2;
506 u8 node_idx;
507 u8 namelen;
508 __be32 pad3;
509 u8 name[O2NM_MAX_NAME_LEN];
510 };
511
512 #define DLM_MRES_RECOVERY 0x01
513 #define DLM_MRES_MIGRATION 0x02
514 #define DLM_MRES_ALL_DONE 0x04
515
516 /*
517 * We would like to get one whole lockres into a single network
518 * message whenever possible. Generally speaking, there will be
519 * at most one dlm_lock on a lockres for each node in the cluster,
520 * plus (infrequently) any additional locks coming in from userdlm.
521 *
522 * struct _dlm_lockres_page
523 * {
524 * dlm_migratable_lockres mres;
525 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
526 * u8 pad[DLM_MIG_LOCKRES_RESERVED];
527 * };
528 *
529 * from ../cluster/tcp.h
530 * O2NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
531 * (roughly 4080 bytes)
532 * and sizeof(dlm_migratable_lockres) = 112 bytes
533 * and sizeof(dlm_migratable_lock) = 16 bytes
534 *
535 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
536 * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
537 *
538 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
539 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
540 * NET_MAX_PAYLOAD_BYTES
541 * (240 * 16) + 112 + 128 = 4080
542 *
543 * So a lockres would need more than 240 locks before it would
544 * use more than one network packet to recover. Not too bad.
545 */
546 #define DLM_MAX_MIGRATABLE_LOCKS 240
547
548 struct dlm_migratable_lockres
549 {
550 u8 master;
551 u8 lockname_len;
552 u8 num_locks; // locks sent in this structure
553 u8 flags;
554 __be32 total_locks; // locks to be sent for this migration cookie
555 __be64 mig_cookie; // cookie for this lockres migration
556 // or zero if not needed
557 // 16 bytes
558 u8 lockname[DLM_LOCKID_NAME_MAX];
559 // 48 bytes
560 u8 lvb[DLM_LVB_LEN];
561 // 112 bytes
562 struct dlm_migratable_lock ml[]; // 16 bytes each, begins at byte 112
563 };
564 #define DLM_MIG_LOCKRES_MAX_LEN \
565 (sizeof(struct dlm_migratable_lockres) + \
566 (sizeof(struct dlm_migratable_lock) * \
567 DLM_MAX_MIGRATABLE_LOCKS) )
568
569 /* from above, 128 bytes
570 * for some undetermined future use */
571 #define DLM_MIG_LOCKRES_RESERVED (O2NET_MAX_PAYLOAD_BYTES - \
572 DLM_MIG_LOCKRES_MAX_LEN)
573
574 struct dlm_create_lock
575 {
576 __be64 cookie;
577
578 __be32 flags;
579 u8 pad1;
580 u8 node_idx;
581 s8 requested_type;
582 u8 namelen;
583
584 u8 name[O2NM_MAX_NAME_LEN];
585 };
586
587 struct dlm_convert_lock
588 {
589 __be64 cookie;
590
591 __be32 flags;
592 u8 pad1;
593 u8 node_idx;
594 s8 requested_type;
595 u8 namelen;
596
597 u8 name[O2NM_MAX_NAME_LEN];
598
599 s8 lvb[];
600 };
601 #define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
602
603 struct dlm_unlock_lock
604 {
605 __be64 cookie;
606
607 __be32 flags;
608 __be16 pad1;
609 u8 node_idx;
610 u8 namelen;
611
612 u8 name[O2NM_MAX_NAME_LEN];
613
614 s8 lvb[];
615 };
616 #define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
617
618 struct dlm_proxy_ast
619 {
620 __be64 cookie;
621
622 __be32 flags;
623 u8 node_idx;
624 u8 type;
625 u8 blocked_type;
626 u8 namelen;
627
628 u8 name[O2NM_MAX_NAME_LEN];
629
630 s8 lvb[];
631 };
632 #define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
633
634 #define DLM_MOD_KEY (0x666c6172)
635 enum dlm_query_join_response_code {
636 JOIN_DISALLOW = 0,
637 JOIN_OK = 1,
638 JOIN_OK_NO_MAP = 2,
639 JOIN_PROTOCOL_MISMATCH = 3,
640 };
641
642 struct dlm_query_join_packet {
643 u8 code; /* Response code. dlm_minor and fs_minor
644 are only valid if this is JOIN_OK */
645 u8 dlm_minor; /* The minor version of the protocol the
646 dlm is speaking. */
647 u8 fs_minor; /* The minor version of the protocol the
648 filesystem is speaking. */
649 u8 reserved;
650 };
651
652 union dlm_query_join_response {
653 __be32 intval;
654 struct dlm_query_join_packet packet;
655 };
656
657 struct dlm_lock_request
658 {
659 u8 node_idx;
660 u8 dead_node;
661 __be16 pad1;
662 __be32 pad2;
663 };
664
665 struct dlm_reco_data_done
666 {
667 u8 node_idx;
668 u8 dead_node;
669 __be16 pad1;
670 __be32 pad2;
671
672 /* unused for now */
673 /* eventually we can use this to attempt
674 * lvb recovery based on each node's info */
675 u8 reco_lvb[DLM_LVB_LEN];
676 };
677
678 struct dlm_begin_reco
679 {
680 u8 node_idx;
681 u8 dead_node;
682 __be16 pad1;
683 __be32 pad2;
684 };
685
686 struct dlm_query_join_request
687 {
688 u8 node_idx;
689 u8 pad1[2];
690 u8 name_len;
691 struct dlm_protocol_version dlm_proto;
692 struct dlm_protocol_version fs_proto;
693 u8 domain[O2NM_MAX_NAME_LEN];
694 u8 node_map[BITS_TO_BYTES(O2NM_MAX_NODES)];
695 };
696
697 struct dlm_assert_joined
698 {
699 u8 node_idx;
700 u8 pad1[2];
701 u8 name_len;
702 u8 domain[O2NM_MAX_NAME_LEN];
703 };
704
705 struct dlm_cancel_join
706 {
707 u8 node_idx;
708 u8 pad1[2];
709 u8 name_len;
710 u8 domain[O2NM_MAX_NAME_LEN];
711 };
712
713 struct dlm_query_region {
714 u8 qr_node;
715 u8 qr_numregions;
716 u8 qr_namelen;
717 u8 pad1;
718 u8 qr_domain[O2NM_MAX_NAME_LEN];
719 u8 qr_regions[O2HB_MAX_REGION_NAME_LEN * O2NM_MAX_REGIONS];
720 };
721
722 struct dlm_node_info {
723 u8 ni_nodenum;
724 u8 pad1;
725 __be16 ni_ipv4_port;
726 __be32 ni_ipv4_address;
727 };
728
729 struct dlm_query_nodeinfo {
730 u8 qn_nodenum;
731 u8 qn_numnodes;
732 u8 qn_namelen;
733 u8 pad1;
734 u8 qn_domain[O2NM_MAX_NAME_LEN];
735 struct dlm_node_info qn_nodes[O2NM_MAX_NODES];
736 };
737
738 struct dlm_exit_domain
739 {
740 u8 node_idx;
741 u8 pad1[3];
742 };
743
744 struct dlm_finalize_reco
745 {
746 u8 node_idx;
747 u8 dead_node;
748 u8 flags;
749 u8 pad1;
750 __be32 pad2;
751 };
752
753 struct dlm_deref_lockres
754 {
755 u32 pad1;
756 u16 pad2;
757 u8 node_idx;
758 u8 namelen;
759
760 u8 name[O2NM_MAX_NAME_LEN];
761 };
762
763 enum {
764 DLM_DEREF_RESPONSE_DONE = 0,
765 DLM_DEREF_RESPONSE_INPROG = 1,
766 };
767
768 struct dlm_deref_lockres_done {
769 u32 pad1;
770 u16 pad2;
771 u8 node_idx;
772 u8 namelen;
773
774 u8 name[O2NM_MAX_NAME_LEN];
775 };
776
777 static inline enum dlm_status
__dlm_lockres_state_to_status(struct dlm_lock_resource * res)778 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
779 {
780 enum dlm_status status = DLM_NORMAL;
781
782 assert_spin_locked(&res->spinlock);
783
784 if (res->state & (DLM_LOCK_RES_RECOVERING|
785 DLM_LOCK_RES_RECOVERY_WAITING))
786 status = DLM_RECOVERING;
787 else if (res->state & DLM_LOCK_RES_MIGRATING)
788 status = DLM_MIGRATING;
789 else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
790 status = DLM_FORWARD;
791
792 return status;
793 }
794
dlm_get_lock_cookie_node(u64 cookie)795 static inline u8 dlm_get_lock_cookie_node(u64 cookie)
796 {
797 u8 ret;
798 cookie >>= 56;
799 ret = (u8)(cookie & 0xffULL);
800 return ret;
801 }
802
dlm_get_lock_cookie_seq(u64 cookie)803 static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
804 {
805 unsigned long long ret;
806 ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
807 return ret;
808 }
809
810 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
811 struct dlm_lockstatus *lksb);
812 void dlm_lock_get(struct dlm_lock *lock);
813 void dlm_lock_put(struct dlm_lock *lock);
814
815 void dlm_lock_attach_lockres(struct dlm_lock *lock,
816 struct dlm_lock_resource *res);
817
818 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data,
819 void **ret_data);
820 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data,
821 void **ret_data);
822 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data,
823 void **ret_data);
824
825 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
826 struct dlm_lock *lock);
827 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
828 struct dlm_lock *lock);
829
830 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data,
831 void **ret_data);
832 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
833 struct dlm_lock *lock);
834 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
835 struct dlm_lock *lock);
836
837 int dlm_launch_thread(struct dlm_ctxt *dlm);
838 void dlm_complete_thread(struct dlm_ctxt *dlm);
839 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
840 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
841 void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
842 void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
843 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
844 void dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
845 void dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout);
846
847 void dlm_put(struct dlm_ctxt *dlm);
848 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
849 int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
850
851 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
852 struct dlm_lock_resource *res);
853 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
854 struct dlm_lock_resource *res);
dlm_lockres_get(struct dlm_lock_resource * res)855 static inline void dlm_lockres_get(struct dlm_lock_resource *res)
856 {
857 /* This is called on every lookup, so it might be worth
858 * inlining. */
859 kref_get(&res->refs);
860 }
861 void dlm_lockres_put(struct dlm_lock_resource *res);
862 void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
863 void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
864 struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm,
865 const char *name,
866 unsigned int len,
867 unsigned int hash);
868 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
869 const char *name,
870 unsigned int len,
871 unsigned int hash);
872 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
873 const char *name,
874 unsigned int len);
875
876 int dlm_is_host_down(int errno);
877
878 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
879 const char *lockid,
880 int namelen,
881 int flags);
882 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
883 const char *name,
884 unsigned int namelen);
885
886 void dlm_lockres_set_refmap_bit(struct dlm_ctxt *dlm,
887 struct dlm_lock_resource *res, int bit);
888 void dlm_lockres_clear_refmap_bit(struct dlm_ctxt *dlm,
889 struct dlm_lock_resource *res, int bit);
890
891 void dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
892 struct dlm_lock_resource *res);
893 void dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
894 struct dlm_lock_resource *res);
895
896 void __dlm_lockres_grab_inflight_worker(struct dlm_ctxt *dlm,
897 struct dlm_lock_resource *res);
898
899 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
900 void __dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
901 void __dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
902 void dlm_do_local_ast(struct dlm_ctxt *dlm,
903 struct dlm_lock_resource *res,
904 struct dlm_lock *lock);
905 int dlm_do_remote_ast(struct dlm_ctxt *dlm,
906 struct dlm_lock_resource *res,
907 struct dlm_lock *lock);
908 void dlm_do_local_bast(struct dlm_ctxt *dlm,
909 struct dlm_lock_resource *res,
910 struct dlm_lock *lock,
911 int blocked_type);
912 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
913 struct dlm_lock_resource *res,
914 struct dlm_lock *lock,
915 int msg_type,
916 int blocked_type, int flags);
dlm_send_proxy_bast(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,int blocked_type)917 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
918 struct dlm_lock_resource *res,
919 struct dlm_lock *lock,
920 int blocked_type)
921 {
922 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
923 blocked_type, 0);
924 }
925
dlm_send_proxy_ast(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,int flags)926 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
927 struct dlm_lock_resource *res,
928 struct dlm_lock *lock,
929 int flags)
930 {
931 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
932 0, flags);
933 }
934
935 void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
936 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
937
938 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
939 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
940
941
942 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
943 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
944
945 int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
946 int dlm_finish_migration(struct dlm_ctxt *dlm,
947 struct dlm_lock_resource *res,
948 u8 old_master);
949 void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
950 struct dlm_lock_resource *res);
951 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
952
953 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data,
954 void **ret_data);
955 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data,
956 void **ret_data);
957 void dlm_assert_master_post_handler(int status, void *data, void *ret_data);
958 int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
959 void **ret_data);
960 int dlm_deref_lockres_done_handler(struct o2net_msg *msg, u32 len, void *data,
961 void **ret_data);
962 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data,
963 void **ret_data);
964 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
965 void **ret_data);
966 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
967 void **ret_data);
968 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data,
969 void **ret_data);
970 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data,
971 void **ret_data);
972 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data,
973 void **ret_data);
974 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data,
975 void **ret_data);
976 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
977 u8 nodenum, u8 *real_master);
978
979 void __dlm_do_purge_lockres(struct dlm_ctxt *dlm,
980 struct dlm_lock_resource *res);
981
982 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
983 struct dlm_lock_resource *res,
984 int ignore_higher,
985 u8 request_from,
986 u32 flags);
987
988
989 int dlm_send_one_lockres(struct dlm_ctxt *dlm,
990 struct dlm_lock_resource *res,
991 struct dlm_migratable_lockres *mres,
992 u8 send_to,
993 u8 flags);
994 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
995 struct dlm_lock_resource *res);
996
997 /* will exit holding res->spinlock, but may drop in function */
998 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
999
1000 /* will exit holding res->spinlock, but may drop in function */
__dlm_wait_on_lockres(struct dlm_lock_resource * res)1001 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
1002 {
1003 __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
1004 DLM_LOCK_RES_RECOVERING|
1005 DLM_LOCK_RES_RECOVERY_WAITING|
1006 DLM_LOCK_RES_MIGRATING));
1007 }
1008
1009 void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
1010 void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
1011
1012 /* create/destroy slab caches */
1013 int dlm_init_master_caches(void);
1014 void dlm_destroy_master_caches(void);
1015
1016 int dlm_init_lock_cache(void);
1017 void dlm_destroy_lock_cache(void);
1018
1019 int dlm_init_mle_cache(void);
1020 void dlm_destroy_mle_cache(void);
1021
1022 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
1023 int dlm_drop_lockres_ref(struct dlm_ctxt *dlm,
1024 struct dlm_lock_resource *res);
1025 void dlm_clean_master_list(struct dlm_ctxt *dlm,
1026 u8 dead_node);
1027 void dlm_force_free_mles(struct dlm_ctxt *dlm);
1028 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
1029 int __dlm_lockres_has_locks(struct dlm_lock_resource *res);
1030 int __dlm_lockres_unused(struct dlm_lock_resource *res);
1031
dlm_lock_mode_name(int mode)1032 static inline const char * dlm_lock_mode_name(int mode)
1033 {
1034 switch (mode) {
1035 case LKM_EXMODE:
1036 return "EX";
1037 case LKM_PRMODE:
1038 return "PR";
1039 case LKM_NLMODE:
1040 return "NL";
1041 }
1042 return "UNKNOWN";
1043 }
1044
1045
dlm_lock_compatible(int existing,int request)1046 static inline int dlm_lock_compatible(int existing, int request)
1047 {
1048 /* NO_LOCK compatible with all */
1049 if (request == LKM_NLMODE ||
1050 existing == LKM_NLMODE)
1051 return 1;
1052
1053 /* EX incompatible with all non-NO_LOCK */
1054 if (request == LKM_EXMODE)
1055 return 0;
1056
1057 /* request must be PR, which is compatible with PR */
1058 if (existing == LKM_PRMODE)
1059 return 1;
1060
1061 return 0;
1062 }
1063
dlm_lock_on_list(struct list_head * head,struct dlm_lock * lock)1064 static inline int dlm_lock_on_list(struct list_head *head,
1065 struct dlm_lock *lock)
1066 {
1067 struct dlm_lock *tmplock;
1068
1069 list_for_each_entry(tmplock, head, list) {
1070 if (tmplock == lock)
1071 return 1;
1072 }
1073 return 0;
1074 }
1075
1076
dlm_err_to_dlm_status(int err)1077 static inline enum dlm_status dlm_err_to_dlm_status(int err)
1078 {
1079 enum dlm_status ret;
1080 if (err == -ENOMEM)
1081 ret = DLM_SYSERR;
1082 else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
1083 ret = DLM_NOLOCKMGR;
1084 else if (err == -EINVAL)
1085 ret = DLM_BADPARAM;
1086 else if (err == -ENAMETOOLONG)
1087 ret = DLM_IVBUFLEN;
1088 else
1089 ret = DLM_BADARGS;
1090 return ret;
1091 }
1092
1093
dlm_node_iter_init(unsigned long * map,struct dlm_node_iter * iter)1094 static inline void dlm_node_iter_init(unsigned long *map,
1095 struct dlm_node_iter *iter)
1096 {
1097 bitmap_copy(iter->node_map, map, O2NM_MAX_NODES);
1098 iter->curnode = -1;
1099 }
1100
dlm_node_iter_next(struct dlm_node_iter * iter)1101 static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
1102 {
1103 int bit;
1104 bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
1105 if (bit >= O2NM_MAX_NODES) {
1106 iter->curnode = O2NM_MAX_NODES;
1107 return -ENOENT;
1108 }
1109 iter->curnode = bit;
1110 return bit;
1111 }
1112
dlm_set_lockres_owner(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,u8 owner)1113 static inline void dlm_set_lockres_owner(struct dlm_ctxt *dlm,
1114 struct dlm_lock_resource *res,
1115 u8 owner)
1116 {
1117 assert_spin_locked(&res->spinlock);
1118
1119 res->owner = owner;
1120 }
1121
dlm_change_lockres_owner(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,u8 owner)1122 static inline void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
1123 struct dlm_lock_resource *res,
1124 u8 owner)
1125 {
1126 assert_spin_locked(&res->spinlock);
1127
1128 if (owner != res->owner)
1129 dlm_set_lockres_owner(dlm, res, owner);
1130 }
1131
1132 #endif /* DLMCOMMON_H */
1133