blob: c4eccd499db8a3eedc3ce024765325985e4fee00 [file] [log] [blame]
Thomas Gleixner328970d2019-05-24 12:04:05 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Masahiro Yamadafa60ce22021-05-06 18:06:44 -07002/*
Kurt Hackel6714d8e2005-12-15 14:31:23 -08003 * dlmdomain.c
4 *
5 * defines domain join / leave apis
6 *
7 * Copyright (C) 2004 Oracle. All rights reserved.
Kurt Hackel6714d8e2005-12-15 14:31:23 -08008 */
9
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/slab.h>
13#include <linux/highmem.h>
Kurt Hackel6714d8e2005-12-15 14:31:23 -080014#include <linux/init.h>
15#include <linux/spinlock.h>
16#include <linux/delay.h>
17#include <linux/err.h>
Sunil Mushran6325b4a2008-03-10 15:16:22 -070018#include <linux/debugfs.h>
Ingo Molnar174cd4b2017-02-02 19:15:33 +010019#include <linux/sched/signal.h>
Kurt Hackel6714d8e2005-12-15 14:31:23 -080020
Masahiro Yamadaca322fb2020-01-30 22:11:40 -080021#include "../cluster/heartbeat.h"
22#include "../cluster/nodemanager.h"
23#include "../cluster/tcp.h"
Kurt Hackel6714d8e2005-12-15 14:31:23 -080024
25#include "dlmapi.h"
26#include "dlmcommon.h"
Kurt Hackel6714d8e2005-12-15 14:31:23 -080027#include "dlmdomain.h"
Sunil Mushran6325b4a2008-03-10 15:16:22 -070028#include "dlmdebug.h"
Kurt Hackel6714d8e2005-12-15 14:31:23 -080029
Kurt Hackel6714d8e2005-12-15 14:31:23 -080030#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
Masahiro Yamadaca322fb2020-01-30 22:11:40 -080031#include "../cluster/masklog.h"
Kurt Hackel6714d8e2005-12-15 14:31:23 -080032
Srinivas Eeda1faf2892007-01-29 15:31:35 -080033/*
34 * ocfs2 node maps are array of long int, which limits to send them freely
35 * across the wire due to endianness issues. To workaround this, we convert
36 * long ints to byte arrays. Following 3 routines are helper functions to
37 * set/test/copy bits within those array of bytes
38 */
39static inline void byte_set_bit(u8 nr, u8 map[])
40{
41 map[nr >> 3] |= (1UL << (nr & 7));
42}
43
44static inline int byte_test_bit(u8 nr, u8 map[])
45{
46 return ((1UL << (nr & 7)) & (map[nr >> 3])) != 0;
47}
48
49static inline void byte_copymap(u8 dmap[], unsigned long smap[],
50 unsigned int sz)
51{
52 unsigned int nn;
53
54 if (!sz)
55 return;
56
57 memset(dmap, 0, ((sz + 7) >> 3));
58 for (nn = 0 ; nn < sz; nn++)
59 if (test_bit(nn, smap))
60 byte_set_bit(nn, dmap);
61}
62
Daniel Phillips03d864c2006-03-10 18:08:16 -080063static void dlm_free_pagevec(void **vec, int pages)
64{
65 while (pages--)
66 free_page((unsigned long)vec[pages]);
67 kfree(vec);
68}
69
70static void **dlm_alloc_pagevec(int pages)
71{
Kees Cook6da2ec52018-06-12 13:55:00 -070072 void **vec = kmalloc_array(pages, sizeof(void *), GFP_KERNEL);
Daniel Phillips03d864c2006-03-10 18:08:16 -080073 int i;
74
75 if (!vec)
76 return NULL;
77
78 for (i = 0; i < pages; i++)
79 if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL)))
80 goto out_free;
Joel Beckerc8f33b62006-03-16 17:40:37 -080081
Mark Fasheh685f1ad2006-03-23 11:23:29 -080082 mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
Mark Fashehf5a923d2006-11-28 15:13:18 -080083 pages, (unsigned long)DLM_HASH_PAGES,
84 (unsigned long)DLM_BUCKETS_PER_PAGE);
Daniel Phillips03d864c2006-03-10 18:08:16 -080085 return vec;
86out_free:
87 dlm_free_pagevec(vec, i);
88 return NULL;
89}
90
Kurt Hackel6714d8e2005-12-15 14:31:23 -080091/*
92 *
93 * spinlock lock ordering: if multiple locks are needed, obey this ordering:
94 * dlm_domain_lock
95 * struct dlm_ctxt->spinlock
96 * struct dlm_lock_resource->spinlock
97 * struct dlm_ctxt->master_lock
98 * struct dlm_ctxt->ast_lock
99 * dlm_master_list_entry->spinlock
100 * dlm_lock->spinlock
101 *
102 */
103
Ingo Molnar34af9462006-06-27 02:53:55 -0700104DEFINE_SPINLOCK(dlm_domain_lock);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800105LIST_HEAD(dlm_domains);
106static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events);
107
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800108/*
109 * The supported protocol version for DLM communication. Running domains
110 * will have a negotiated version with the same major number and a minor
111 * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should
112 * be used to determine what a running domain is actually using.
Sunil Mushranea203442010-10-09 10:26:23 -0700113 *
114 * New in version 1.1:
115 * - Message DLM_QUERY_REGION added to support global heartbeat
Sunil Mushran18cfdf12010-10-07 16:47:03 -0700116 * - Message DLM_QUERY_NODEINFO added to allow online node removes
Sunil Mushranbddefde2011-05-19 14:34:11 -0700117 * New in version 1.2:
118 * - Message DLM_BEGIN_EXIT_DOMAIN_MSG added to mark start of exit domain
xuejiufei60d663c2016-03-15 14:53:08 -0700119 * New in version 1.3:
120 * - Message DLM_DEREF_LOCKRES_DONE added to inform non-master that the
121 * refmap is cleared
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800122 */
123static const struct dlm_protocol_version dlm_protocol = {
124 .pv_major = 1,
xuejiufei60d663c2016-03-15 14:53:08 -0700125 .pv_minor = 3,
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800126};
127
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800128#define DLM_DOMAIN_BACKOFF_MS 200
129
Kurt Hackeld74c9802007-01-17 17:04:25 -0800130static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
131 void **ret_data);
132static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
133 void **ret_data);
134static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
135 void **ret_data);
Sunil Mushranea203442010-10-09 10:26:23 -0700136static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
137 void *data, void **ret_data);
Kurt Hackeld74c9802007-01-17 17:04:25 -0800138static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
139 void **ret_data);
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800140static int dlm_protocol_compare(struct dlm_protocol_version *existing,
141 struct dlm_protocol_version *request);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800142
143static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm);
144
Sunil Mushrane9f0b6a2011-07-24 10:27:54 -0700145void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800146{
Sunil Mushrane9f0b6a2011-07-24 10:27:54 -0700147 if (hlist_unhashed(&res->hash_node))
148 return;
149
150 mlog(0, "%s: Unhash res %.*s\n", dlm->name, res->lockname.len,
151 res->lockname.name);
152 hlist_del_init(&res->hash_node);
153 dlm_lockres_put(res);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800154}
155
Sunil Mushrane9f0b6a2011-07-24 10:27:54 -0700156void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800157{
Mark Fasheh81f20942006-02-28 17:31:22 -0800158 struct hlist_head *bucket;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800159
160 assert_spin_locked(&dlm->spinlock);
161
Al Viro612645f2016-07-20 16:27:42 -0400162 bucket = dlm_lockres_hash(dlm, res->lockname.hash);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800163
164 /* get a reference for our hashtable */
165 dlm_lockres_get(res);
166
Mark Fasheh81f20942006-02-28 17:31:22 -0800167 hlist_add_head(&res->hash_node, bucket);
Sunil Mushrane9f0b6a2011-07-24 10:27:54 -0700168
169 mlog(0, "%s: Hash res %.*s\n", dlm->name, res->lockname.len,
170 res->lockname.name);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800171}
172
Kurt Hackelba2bf212006-12-01 14:47:20 -0800173struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm,
174 const char *name,
175 unsigned int len,
176 unsigned int hash)
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800177{
Mark Fasheh81f20942006-02-28 17:31:22 -0800178 struct hlist_head *bucket;
Dong Fangdf53cd32013-09-11 14:19:50 -0700179 struct dlm_lock_resource *res;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800180
Tao Maef6b6892011-02-21 11:10:44 +0800181 mlog(0, "%.*s\n", len, name);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800182
183 assert_spin_locked(&dlm->spinlock);
184
Daniel Phillips03d864c2006-03-10 18:08:16 -0800185 bucket = dlm_lockres_hash(dlm, hash);
186
Dong Fangdf53cd32013-09-11 14:19:50 -0700187 hlist_for_each_entry(res, bucket, hash_node) {
Daniel Phillips41989852006-03-10 13:31:47 -0800188 if (res->lockname.name[0] != name[0])
189 continue;
190 if (unlikely(res->lockname.len != len))
191 continue;
192 if (memcmp(res->lockname.name + 1, name + 1, len - 1))
193 continue;
194 dlm_lockres_get(res);
195 return res;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800196 }
Daniel Phillips41989852006-03-10 13:31:47 -0800197 return NULL;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800198}
199
Kurt Hackelba2bf212006-12-01 14:47:20 -0800200/* intended to be called by functions which do not care about lock
201 * resources which are being purged (most net _handler functions).
202 * this will return NULL for any lock resource which is found but
203 * currently in the process of dropping its mastery reference.
204 * use __dlm_lookup_lockres_full when you need the lock resource
205 * regardless (e.g. dlm_get_lock_resource) */
206struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
207 const char *name,
208 unsigned int len,
209 unsigned int hash)
210{
211 struct dlm_lock_resource *res = NULL;
212
Tao Maef6b6892011-02-21 11:10:44 +0800213 mlog(0, "%.*s\n", len, name);
Kurt Hackelba2bf212006-12-01 14:47:20 -0800214
215 assert_spin_locked(&dlm->spinlock);
216
217 res = __dlm_lookup_lockres_full(dlm, name, len, hash);
218 if (res) {
219 spin_lock(&res->spinlock);
220 if (res->state & DLM_LOCK_RES_DROPPING_REF) {
221 spin_unlock(&res->spinlock);
222 dlm_lockres_put(res);
223 return NULL;
224 }
225 spin_unlock(&res->spinlock);
226 }
227
228 return res;
229}
230
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800231struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
232 const char *name,
233 unsigned int len)
234{
235 struct dlm_lock_resource *res;
Mark Fasheha3d33292006-03-09 17:55:56 -0800236 unsigned int hash = dlm_lockid_hash(name, len);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800237
238 spin_lock(&dlm->spinlock);
Mark Fasheha3d33292006-03-09 17:55:56 -0800239 res = __dlm_lookup_lockres(dlm, name, len, hash);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800240 spin_unlock(&dlm->spinlock);
241 return res;
242}
243
244static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len)
245{
Dong Fangdf53cd32013-09-11 14:19:50 -0700246 struct dlm_ctxt *tmp;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800247
248 assert_spin_locked(&dlm_domain_lock);
249
250 /* tmp->name here is always NULL terminated,
251 * but domain may not be! */
Dong Fangdf53cd32013-09-11 14:19:50 -0700252 list_for_each_entry(tmp, &dlm_domains, list) {
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800253 if (strlen(tmp->name) == len &&
254 memcmp(tmp->name, domain, len)==0)
Dong Fangdf53cd32013-09-11 14:19:50 -0700255 return tmp;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800256 }
257
Dong Fangdf53cd32013-09-11 14:19:50 -0700258 return NULL;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800259}
260
261/* For null terminated domain strings ONLY */
262static struct dlm_ctxt * __dlm_lookup_domain(const char *domain)
263{
264 assert_spin_locked(&dlm_domain_lock);
265
266 return __dlm_lookup_domain_full(domain, strlen(domain));
267}
268
269
270/* returns true on one of two conditions:
271 * 1) the domain does not exist
272 * 2) the domain exists and it's state is "joined" */
273static int dlm_wait_on_domain_helper(const char *domain)
274{
275 int ret = 0;
276 struct dlm_ctxt *tmp = NULL;
277
278 spin_lock(&dlm_domain_lock);
279
280 tmp = __dlm_lookup_domain(domain);
281 if (!tmp)
282 ret = 1;
283 else if (tmp->dlm_state == DLM_CTXT_JOINED)
284 ret = 1;
285
286 spin_unlock(&dlm_domain_lock);
287 return ret;
288}
289
290static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
291{
Sunil Mushran6325b4a2008-03-10 15:16:22 -0700292 dlm_destroy_debugfs_subroot(dlm);
293
Mark Fasheh81f20942006-02-28 17:31:22 -0800294 if (dlm->lockres_hash)
Daniel Phillips03d864c2006-03-10 18:08:16 -0800295 dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800296
Sunil Mushrane2b66dd2009-02-26 15:00:40 -0800297 if (dlm->master_hash)
298 dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
299
Tim Gardnerd787ab02013-02-21 16:42:44 -0800300 kfree(dlm->name);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800301 kfree(dlm);
302}
303
304/* A little strange - this function will be called while holding
305 * dlm_domain_lock and is expected to be holding it on the way out. We
306 * will however drop and reacquire it multiple times */
307static void dlm_ctxt_release(struct kref *kref)
308{
309 struct dlm_ctxt *dlm;
310
311 dlm = container_of(kref, struct dlm_ctxt, dlm_refs);
312
313 BUG_ON(dlm->num_joins);
314 BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED);
315
316 /* we may still be in the list if we hit an error during join. */
317 list_del_init(&dlm->list);
318
319 spin_unlock(&dlm_domain_lock);
320
321 mlog(0, "freeing memory from domain %s\n", dlm->name);
322
323 wake_up(&dlm_domain_events);
324
325 dlm_free_ctxt_mem(dlm);
326
327 spin_lock(&dlm_domain_lock);
328}
329
330void dlm_put(struct dlm_ctxt *dlm)
331{
332 spin_lock(&dlm_domain_lock);
333 kref_put(&dlm->dlm_refs, dlm_ctxt_release);
334 spin_unlock(&dlm_domain_lock);
335}
336
337static void __dlm_get(struct dlm_ctxt *dlm)
338{
339 kref_get(&dlm->dlm_refs);
340}
341
342/* given a questionable reference to a dlm object, gets a reference if
343 * it can find it in the list, otherwise returns NULL in which case
344 * you shouldn't trust your pointer. */
345struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm)
346{
Dong Fangdf53cd32013-09-11 14:19:50 -0700347 struct dlm_ctxt *target;
348 struct dlm_ctxt *ret = NULL;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800349
350 spin_lock(&dlm_domain_lock);
351
Dong Fangdf53cd32013-09-11 14:19:50 -0700352 list_for_each_entry(target, &dlm_domains, list) {
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800353 if (target == dlm) {
354 __dlm_get(target);
Dong Fangdf53cd32013-09-11 14:19:50 -0700355 ret = target;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800356 break;
357 }
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800358 }
359
360 spin_unlock(&dlm_domain_lock);
361
Dong Fangdf53cd32013-09-11 14:19:50 -0700362 return ret;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800363}
364
365int dlm_domain_fully_joined(struct dlm_ctxt *dlm)
366{
367 int ret;
368
369 spin_lock(&dlm_domain_lock);
370 ret = (dlm->dlm_state == DLM_CTXT_JOINED) ||
371 (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN);
372 spin_unlock(&dlm_domain_lock);
373
374 return ret;
375}
376
Kurt Hackel3156d262006-05-01 14:39:29 -0700377static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm)
378{
379 if (dlm->dlm_worker) {
Kurt Hackel3156d262006-05-01 14:39:29 -0700380 destroy_workqueue(dlm->dlm_worker);
381 dlm->dlm_worker = NULL;
382 }
383}
384
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800385static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm)
386{
387 dlm_unregister_domain_handlers(dlm);
388 dlm_complete_thread(dlm);
389 dlm_complete_recovery_thread(dlm);
Kurt Hackel3156d262006-05-01 14:39:29 -0700390 dlm_destroy_dlm_worker(dlm);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800391
392 /* We've left the domain. Now we can take ourselves out of the
393 * list and allow the kref stuff to help us free the
394 * memory. */
395 spin_lock(&dlm_domain_lock);
396 list_del_init(&dlm->list);
397 spin_unlock(&dlm_domain_lock);
398
399 /* Wake up anyone waiting for us to remove this domain */
400 wake_up(&dlm_domain_events);
401}
402
Kurt Hackelba2bf212006-12-01 14:47:20 -0800403static int dlm_migrate_all_locks(struct dlm_ctxt *dlm)
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800404{
Kurt Hackelba2bf212006-12-01 14:47:20 -0800405 int i, num, n, ret = 0;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800406 struct dlm_lock_resource *res;
Kurt Hackelba2bf212006-12-01 14:47:20 -0800407 struct hlist_node *iter;
408 struct hlist_head *bucket;
409 int dropped;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800410
411 mlog(0, "Migrating locks from domain %s\n", dlm->name);
Kurt Hackelba2bf212006-12-01 14:47:20 -0800412
413 num = 0;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800414 spin_lock(&dlm->spinlock);
Mark Fasheh81f20942006-02-28 17:31:22 -0800415 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
Kurt Hackelba2bf212006-12-01 14:47:20 -0800416redo_bucket:
417 n = 0;
418 bucket = dlm_lockres_hash(dlm, i);
419 iter = bucket->first;
420 while (iter) {
421 n++;
422 res = hlist_entry(iter, struct dlm_lock_resource,
423 hash_node);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800424 dlm_lockres_get(res);
Kurt Hackelba2bf212006-12-01 14:47:20 -0800425 /* migrate, if necessary. this will drop the dlm
426 * spinlock and retake it if it does migration. */
427 dropped = dlm_empty_lockres(dlm, res);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800428
Kurt Hackelba2bf212006-12-01 14:47:20 -0800429 spin_lock(&res->spinlock);
Sunil Mushran66effd32011-05-19 14:34:12 -0700430 if (dropped)
431 __dlm_lockres_calc_usage(dlm, res);
432 else
433 iter = res->hash_node.next;
Kurt Hackelba2bf212006-12-01 14:47:20 -0800434 spin_unlock(&res->spinlock);
435
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800436 dlm_lockres_put(res);
Kurt Hackelba2bf212006-12-01 14:47:20 -0800437
Sunil Mushran66effd32011-05-19 14:34:12 -0700438 if (dropped) {
439 cond_resched_lock(&dlm->spinlock);
Kurt Hackelba2bf212006-12-01 14:47:20 -0800440 goto redo_bucket;
Sunil Mushran66effd32011-05-19 14:34:12 -0700441 }
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800442 }
Sunil Mushran0d01af62007-04-17 13:32:20 -0700443 cond_resched_lock(&dlm->spinlock);
Kurt Hackelba2bf212006-12-01 14:47:20 -0800444 num += n;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800445 }
piaojun60c7ec92018-04-05 16:19:11 -0700446
447 if (!num) {
448 if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
449 mlog(0, "%s: perhaps there are more lock resources "
450 "need to be migrated after dlm recovery\n", dlm->name);
451 ret = -EAGAIN;
452 } else {
453 mlog(0, "%s: we won't do dlm recovery after migrating "
454 "all lock resources\n", dlm->name);
455 dlm->migrate_done = 1;
456 }
457 }
458
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800459 spin_unlock(&dlm->spinlock);
Kurt Hackelba2bf212006-12-01 14:47:20 -0800460 wake_up(&dlm->dlm_thread_wq);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800461
Kurt Hackelba2bf212006-12-01 14:47:20 -0800462 /* let the dlm thread take care of purging, keep scanning until
463 * nothing remains in the hash */
464 if (num) {
465 mlog(0, "%s: %d lock resources in hash last pass\n",
466 dlm->name, num);
467 ret = -EAGAIN;
468 }
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800469 mlog(0, "DONE Migrating locks from domain %s\n", dlm->name);
Kurt Hackelba2bf212006-12-01 14:47:20 -0800470 return ret;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800471}
472
473static int dlm_no_joining_node(struct dlm_ctxt *dlm)
474{
475 int ret;
476
477 spin_lock(&dlm->spinlock);
478 ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN;
479 spin_unlock(&dlm->spinlock);
480
481 return ret;
482}
483
Sunil Mushranbddefde2011-05-19 14:34:11 -0700484static int dlm_begin_exit_domain_handler(struct o2net_msg *msg, u32 len,
485 void *data, void **ret_data)
486{
487 struct dlm_ctxt *dlm = data;
488 unsigned int node;
489 struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
490
491 if (!dlm_grab(dlm))
492 return 0;
493
494 node = exit_msg->node_idx;
495 mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm->name, node);
496
497 spin_lock(&dlm->spinlock);
498 set_bit(node, dlm->exit_domain_map);
499 spin_unlock(&dlm->spinlock);
500
501 dlm_put(dlm);
502
503 return 0;
504}
505
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800506static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm)
507{
508 /* Yikes, a double spinlock! I need domain_lock for the dlm
509 * state and the dlm spinlock for join state... Sorry! */
510again:
511 spin_lock(&dlm_domain_lock);
512 spin_lock(&dlm->spinlock);
513
514 if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
515 mlog(0, "Node %d is joining, we wait on it.\n",
516 dlm->joining_node);
517 spin_unlock(&dlm->spinlock);
518 spin_unlock(&dlm_domain_lock);
519
520 wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm));
521 goto again;
522 }
523
524 dlm->dlm_state = DLM_CTXT_LEAVING;
525 spin_unlock(&dlm->spinlock);
526 spin_unlock(&dlm_domain_lock);
527}
528
529static void __dlm_print_nodes(struct dlm_ctxt *dlm)
530{
Sunil Mushran8decab32011-07-24 10:23:54 -0700531 int node = -1, num = 0;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800532
533 assert_spin_locked(&dlm->spinlock);
534
Sunil Mushran8decab32011-07-24 10:23:54 -0700535 printk("( ");
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800536 while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
537 node + 1)) < O2NM_MAX_NODES) {
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700538 printk("%d ", node);
Sunil Mushran8decab32011-07-24 10:23:54 -0700539 ++num;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800540 }
Sunil Mushran8decab32011-07-24 10:23:54 -0700541 printk(") %u nodes\n", num);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800542}
543
Kurt Hackeld74c9802007-01-17 17:04:25 -0800544static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
545 void **ret_data)
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800546{
547 struct dlm_ctxt *dlm = data;
548 unsigned int node;
549 struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
550
Tao Maef6b6892011-02-21 11:10:44 +0800551 mlog(0, "%p %u %p", msg, len, data);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800552
553 if (!dlm_grab(dlm))
554 return 0;
555
556 node = exit_msg->node_idx;
557
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800558 spin_lock(&dlm->spinlock);
559 clear_bit(node, dlm->domain_map);
Sunil Mushranbddefde2011-05-19 14:34:11 -0700560 clear_bit(node, dlm->exit_domain_map);
Sunil Mushran8decab32011-07-24 10:23:54 -0700561 printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s ", node, dlm->name);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800562 __dlm_print_nodes(dlm);
563
564 /* notify anything attached to the heartbeat events */
565 dlm_hb_event_notify_attached(dlm, node, 0);
566
567 spin_unlock(&dlm->spinlock);
568
569 dlm_put(dlm);
570
571 return 0;
572}
573
Sunil Mushranbddefde2011-05-19 14:34:11 -0700574static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, u32 msg_type,
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800575 unsigned int node)
576{
577 int status;
578 struct dlm_exit_domain leave_msg;
579
Sunil Mushranbddefde2011-05-19 14:34:11 -0700580 mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm->name,
581 msg_type, node);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800582
583 memset(&leave_msg, 0, sizeof(leave_msg));
584 leave_msg.node_idx = dlm->node_num;
585
Sunil Mushranbddefde2011-05-19 14:34:11 -0700586 status = o2net_send_message(msg_type, dlm->key, &leave_msg,
587 sizeof(leave_msg), node, NULL);
Wengang Wanga5196ec2010-03-30 12:09:22 +0800588 if (status < 0)
Sunil Mushranbddefde2011-05-19 14:34:11 -0700589 mlog(ML_ERROR, "Error %d sending domain exit message %u "
590 "to node %u on domain %s\n", status, msg_type, node,
591 dlm->name);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800592
593 return status;
594}
595
Sunil Mushranbddefde2011-05-19 14:34:11 -0700596static void dlm_begin_exit_domain(struct dlm_ctxt *dlm)
597{
598 int node = -1;
599
600 /* Support for begin exit domain was added in 1.2 */
601 if (dlm->dlm_locking_proto.pv_major == 1 &&
602 dlm->dlm_locking_proto.pv_minor < 2)
603 return;
604
605 /*
606 * Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely
607 * informational. Meaning if a node does not receive the message,
608 * so be it.
609 */
610 spin_lock(&dlm->spinlock);
611 while (1) {
612 node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, node + 1);
613 if (node >= O2NM_MAX_NODES)
614 break;
615 if (node == dlm->node_num)
616 continue;
617
618 spin_unlock(&dlm->spinlock);
619 dlm_send_one_domain_exit(dlm, DLM_BEGIN_EXIT_DOMAIN_MSG, node);
620 spin_lock(&dlm->spinlock);
621 }
622 spin_unlock(&dlm->spinlock);
623}
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800624
625static void dlm_leave_domain(struct dlm_ctxt *dlm)
626{
627 int node, clear_node, status;
628
629 /* At this point we've migrated away all our locks and won't
630 * accept mastership of new ones. The dlm is responsible for
631 * almost nothing now. We make sure not to confuse any joining
632 * nodes and then commence shutdown procedure. */
633
634 spin_lock(&dlm->spinlock);
635 /* Clear ourselves from the domain map */
636 clear_bit(dlm->node_num, dlm->domain_map);
637 while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
638 0)) < O2NM_MAX_NODES) {
639 /* Drop the dlm spinlock. This is safe wrt the domain_map.
640 * -nodes cannot be added now as the
641 * query_join_handlers knows to respond with OK_NO_MAP
642 * -we catch the right network errors if a node is
643 * removed from the map while we're sending him the
644 * exit message. */
645 spin_unlock(&dlm->spinlock);
646
647 clear_node = 1;
648
Sunil Mushranbddefde2011-05-19 14:34:11 -0700649 status = dlm_send_one_domain_exit(dlm, DLM_EXIT_DOMAIN_MSG,
650 node);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800651 if (status < 0 &&
652 status != -ENOPROTOOPT &&
653 status != -ENOTCONN) {
654 mlog(ML_NOTICE, "Error %d sending domain exit message "
655 "to node %d\n", status, node);
656
657 /* Not sure what to do here but lets sleep for
658 * a bit in case this was a transient
659 * error... */
660 msleep(DLM_DOMAIN_BACKOFF_MS);
661 clear_node = 0;
662 }
663
664 spin_lock(&dlm->spinlock);
665 /* If we're not clearing the node bit then we intend
666 * to loop back around to try again. */
667 if (clear_node)
668 clear_bit(node, dlm->domain_map);
669 }
670 spin_unlock(&dlm->spinlock);
671}
672
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800673void dlm_unregister_domain(struct dlm_ctxt *dlm)
674{
675 int leave = 0;
Sunil Mushran29576f82008-03-10 15:16:21 -0700676 struct dlm_lock_resource *res;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800677
678 spin_lock(&dlm_domain_lock);
679 BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED);
680 BUG_ON(!dlm->num_joins);
681
682 dlm->num_joins--;
683 if (!dlm->num_joins) {
684 /* We mark it "in shutdown" now so new register
685 * requests wait until we've completely left the
686 * domain. Don't use DLM_CTXT_LEAVING yet as we still
687 * want new domain joins to communicate with us at
688 * least until we've completed migration of our
689 * resources. */
690 dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN;
691 leave = 1;
692 }
693 spin_unlock(&dlm_domain_lock);
694
695 if (leave) {
696 mlog(0, "shutting down domain %s\n", dlm->name);
Sunil Mushranbddefde2011-05-19 14:34:11 -0700697 dlm_begin_exit_domain(dlm);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800698
699 /* We changed dlm state, notify the thread */
700 dlm_kick_thread(dlm, NULL);
701
Kurt Hackelba2bf212006-12-01 14:47:20 -0800702 while (dlm_migrate_all_locks(dlm)) {
Sunil Mushran2f5bf1f2007-03-22 17:08:32 -0700703 /* Give dlm_thread time to purge the lockres' */
704 msleep(500);
Kurt Hackelba2bf212006-12-01 14:47:20 -0800705 mlog(0, "%s: more migration to do\n", dlm->name);
706 }
Sunil Mushran29576f82008-03-10 15:16:21 -0700707
708 /* This list should be empty. If not, print remaining lockres */
709 if (!list_empty(&dlm->tracking_list)) {
710 mlog(ML_ERROR, "Following lockres' are still on the "
711 "tracking list:\n");
712 list_for_each_entry(res, &dlm->tracking_list, tracking)
713 dlm_print_one_lock_resource(res);
714 }
715
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800716 dlm_mark_domain_leaving(dlm);
717 dlm_leave_domain(dlm);
Sunil Mushran8decab32011-07-24 10:23:54 -0700718 printk(KERN_NOTICE "o2dlm: Leaving domain %s\n", dlm->name);
Srinivas Eeda5dad6c32010-09-21 16:27:26 -0700719 dlm_force_free_mles(dlm);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800720 dlm_complete_dlm_shutdown(dlm);
721 }
722 dlm_put(dlm);
723}
724EXPORT_SYMBOL_GPL(dlm_unregister_domain);
725
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800726static int dlm_query_join_proto_check(char *proto_type, int node,
727 struct dlm_protocol_version *ours,
728 struct dlm_protocol_version *request)
729{
730 int rc;
731 struct dlm_protocol_version proto = *request;
732
733 if (!dlm_protocol_compare(ours, &proto)) {
734 mlog(0,
735 "node %u wanted to join with %s locking protocol "
736 "%u.%u, we respond with %u.%u\n",
737 node, proto_type,
738 request->pv_major,
739 request->pv_minor,
740 proto.pv_major, proto.pv_minor);
741 request->pv_minor = proto.pv_minor;
742 rc = 0;
743 } else {
744 mlog(ML_NOTICE,
745 "Node %u wanted to join with %s locking "
746 "protocol %u.%u, but we have %u.%u, disallowing\n",
747 node, proto_type,
748 request->pv_major,
749 request->pv_minor,
750 ours->pv_major,
751 ours->pv_minor);
752 rc = 1;
753 }
754
755 return rc;
756}
757
Joel Becker0f71b7b2008-02-12 14:56:25 -0800758/*
759 * struct dlm_query_join_packet is made up of four one-byte fields. They
760 * are effectively in big-endian order already. However, little-endian
761 * machines swap them before putting the packet on the wire (because
762 * query_join's response is a status, and that status is treated as a u32
763 * on the wire). Thus, a big-endian and little-endian machines will treat
764 * this structure differently.
765 *
766 * The solution is to have little-endian machines swap the structure when
767 * converting from the structure to the u32 representation. This will
768 * result in the structure having the correct format on the wire no matter
769 * the host endian format.
770 */
771static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet,
772 u32 *wire)
773{
774 union dlm_query_join_response response;
775
776 response.packet = *packet;
Al Viro85158412012-04-12 18:47:13 -0400777 *wire = be32_to_cpu(response.intval);
Joel Becker0f71b7b2008-02-12 14:56:25 -0800778}
779
780static void dlm_query_join_wire_to_packet(u32 wire,
781 struct dlm_query_join_packet *packet)
782{
783 union dlm_query_join_response response;
784
785 response.intval = cpu_to_be32(wire);
786 *packet = response.packet;
787}
788
Kurt Hackeld74c9802007-01-17 17:04:25 -0800789static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
790 void **ret_data)
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800791{
792 struct dlm_query_join_request *query;
Joel Becker0f71b7b2008-02-12 14:56:25 -0800793 struct dlm_query_join_packet packet = {
794 .code = JOIN_DISALLOW,
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800795 };
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800796 struct dlm_ctxt *dlm = NULL;
Joel Becker0f71b7b2008-02-12 14:56:25 -0800797 u32 response;
Srinivas Eeda1faf2892007-01-29 15:31:35 -0800798 u8 nodenum;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800799
800 query = (struct dlm_query_join_request *) msg->buf;
801
802 mlog(0, "node %u wants to join domain %s\n", query->node_idx,
803 query->domain);
804
805 /*
806 * If heartbeat doesn't consider the node live, tell it
807 * to back off and try again. This gives heartbeat a chance
808 * to catch up.
809 */
Joseph Qi70e82a12014-10-09 15:25:13 -0700810 if (!o2hb_check_node_heartbeating_no_sem(query->node_idx)) {
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800811 mlog(0, "node %u is not in our live map yet\n",
812 query->node_idx);
813
Joel Becker0f71b7b2008-02-12 14:56:25 -0800814 packet.code = JOIN_DISALLOW;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800815 goto respond;
816 }
817
Joel Becker0f71b7b2008-02-12 14:56:25 -0800818 packet.code = JOIN_OK_NO_MAP;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800819
820 spin_lock(&dlm_domain_lock);
821 dlm = __dlm_lookup_domain_full(query->domain, query->name_len);
Srinivas Eeda1faf2892007-01-29 15:31:35 -0800822 if (!dlm)
823 goto unlock_respond;
824
825 /*
826 * There is a small window where the joining node may not see the
827 * node(s) that just left but still part of the cluster. DISALLOW
828 * join request if joining node has different node map.
829 */
830 nodenum=0;
831 while (nodenum < O2NM_MAX_NODES) {
832 if (test_bit(nodenum, dlm->domain_map)) {
833 if (!byte_test_bit(nodenum, query->node_map)) {
Sunil Mushrane4968472007-01-29 15:37:02 -0800834 mlog(0, "disallow join as node %u does not "
835 "have node %u in its nodemap\n",
836 query->node_idx, nodenum);
Joel Becker0f71b7b2008-02-12 14:56:25 -0800837 packet.code = JOIN_DISALLOW;
Srinivas Eeda1faf2892007-01-29 15:31:35 -0800838 goto unlock_respond;
839 }
840 }
841 nodenum++;
842 }
843
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800844 /* Once the dlm ctxt is marked as leaving then we don't want
Sunil Mushran2bd63212010-01-25 16:57:38 -0800845 * to be put in someone's domain map.
Kurt Hackele2faea42006-01-12 14:24:55 -0800846 * Also, explicitly disallow joining at certain troublesome
847 * times (ie. during recovery). */
Dan Carpenterb3e3e5a2014-12-10 15:42:07 -0800848 if (dlm->dlm_state != DLM_CTXT_LEAVING) {
Kurt Hackele2faea42006-01-12 14:24:55 -0800849 int bit = query->node_idx;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800850 spin_lock(&dlm->spinlock);
851
852 if (dlm->dlm_state == DLM_CTXT_NEW &&
853 dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) {
854 /*If this is a brand new context and we
855 * haven't started our join process yet, then
856 * the other node won the race. */
Joel Becker0f71b7b2008-02-12 14:56:25 -0800857 packet.code = JOIN_OK_NO_MAP;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800858 } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
859 /* Disallow parallel joins. */
Joel Becker0f71b7b2008-02-12 14:56:25 -0800860 packet.code = JOIN_DISALLOW;
Kurt Hackele2faea42006-01-12 14:24:55 -0800861 } else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
Sunil Mushrane4968472007-01-29 15:37:02 -0800862 mlog(0, "node %u trying to join, but recovery "
Kurt Hackele2faea42006-01-12 14:24:55 -0800863 "is ongoing.\n", bit);
Joel Becker0f71b7b2008-02-12 14:56:25 -0800864 packet.code = JOIN_DISALLOW;
Kurt Hackele2faea42006-01-12 14:24:55 -0800865 } else if (test_bit(bit, dlm->recovery_map)) {
Sunil Mushrane4968472007-01-29 15:37:02 -0800866 mlog(0, "node %u trying to join, but it "
Kurt Hackele2faea42006-01-12 14:24:55 -0800867 "still needs recovery.\n", bit);
Joel Becker0f71b7b2008-02-12 14:56:25 -0800868 packet.code = JOIN_DISALLOW;
Kurt Hackele2faea42006-01-12 14:24:55 -0800869 } else if (test_bit(bit, dlm->domain_map)) {
Sunil Mushrane4968472007-01-29 15:37:02 -0800870 mlog(0, "node %u trying to join, but it "
Kurt Hackele2faea42006-01-12 14:24:55 -0800871 "is still in the domain! needs recovery?\n",
872 bit);
Joel Becker0f71b7b2008-02-12 14:56:25 -0800873 packet.code = JOIN_DISALLOW;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800874 } else {
875 /* Alright we're fully a part of this domain
876 * so we keep some state as to who's joining
877 * and indicate to him that needs to be fixed
878 * up. */
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800879
880 /* Make sure we speak compatible locking protocols. */
881 if (dlm_query_join_proto_check("DLM", bit,
882 &dlm->dlm_locking_proto,
883 &query->dlm_proto)) {
Joel Becker0f71b7b2008-02-12 14:56:25 -0800884 packet.code = JOIN_PROTOCOL_MISMATCH;
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800885 } else if (dlm_query_join_proto_check("fs", bit,
886 &dlm->fs_locking_proto,
887 &query->fs_proto)) {
Joel Becker0f71b7b2008-02-12 14:56:25 -0800888 packet.code = JOIN_PROTOCOL_MISMATCH;
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800889 } else {
Joel Becker0f71b7b2008-02-12 14:56:25 -0800890 packet.dlm_minor = query->dlm_proto.pv_minor;
891 packet.fs_minor = query->fs_proto.pv_minor;
892 packet.code = JOIN_OK;
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800893 __dlm_set_joining_node(dlm, query->node_idx);
894 }
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800895 }
896
897 spin_unlock(&dlm->spinlock);
898 }
Srinivas Eeda1faf2892007-01-29 15:31:35 -0800899unlock_respond:
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800900 spin_unlock(&dlm_domain_lock);
901
902respond:
Joel Becker0f71b7b2008-02-12 14:56:25 -0800903 mlog(0, "We respond with %u\n", packet.code);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800904
Joel Becker0f71b7b2008-02-12 14:56:25 -0800905 dlm_query_join_packet_to_wire(&packet, &response);
906 return response;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800907}
908
Kurt Hackeld74c9802007-01-17 17:04:25 -0800909static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
910 void **ret_data)
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800911{
912 struct dlm_assert_joined *assert;
913 struct dlm_ctxt *dlm = NULL;
914
915 assert = (struct dlm_assert_joined *) msg->buf;
916
917 mlog(0, "node %u asserts join on domain %s\n", assert->node_idx,
918 assert->domain);
919
920 spin_lock(&dlm_domain_lock);
921 dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len);
922 /* XXX should we consider no dlm ctxt an error? */
923 if (dlm) {
924 spin_lock(&dlm->spinlock);
925
926 /* Alright, this node has officially joined our
927 * domain. Set him in the map and clean up our
928 * leftover join state. */
929 BUG_ON(dlm->joining_node != assert->node_idx);
Xue jiufei01c62222014-06-04 16:06:14 -0700930
931 if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
932 mlog(0, "dlm recovery is ongoing, disallow join\n");
933 spin_unlock(&dlm->spinlock);
934 spin_unlock(&dlm_domain_lock);
935 return -EAGAIN;
936 }
937
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800938 set_bit(assert->node_idx, dlm->domain_map);
Sunil Mushranbddefde2011-05-19 14:34:11 -0700939 clear_bit(assert->node_idx, dlm->exit_domain_map);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800940 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
941
Sunil Mushran8decab32011-07-24 10:23:54 -0700942 printk(KERN_NOTICE "o2dlm: Node %u joins domain %s ",
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700943 assert->node_idx, dlm->name);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800944 __dlm_print_nodes(dlm);
945
946 /* notify anything attached to the heartbeat events */
947 dlm_hb_event_notify_attached(dlm, assert->node_idx, 1);
948
949 spin_unlock(&dlm->spinlock);
950 }
951 spin_unlock(&dlm_domain_lock);
952
953 return 0;
954}
955
Sunil Mushranea203442010-10-09 10:26:23 -0700956static int dlm_match_regions(struct dlm_ctxt *dlm,
Sunil Mushran770c4d82011-02-21 14:25:25 -0800957 struct dlm_query_region *qr,
958 char *local, int locallen)
Sunil Mushranea203442010-10-09 10:26:23 -0700959{
Sunil Mushran770c4d82011-02-21 14:25:25 -0800960 char *remote = qr->qr_regions;
Sunil Mushranea203442010-10-09 10:26:23 -0700961 char *l, *r;
962 int localnr, i, j, foundit;
963 int status = 0;
964
965 if (!o2hb_global_heartbeat_active()) {
966 if (qr->qr_numregions) {
967 mlog(ML_ERROR, "Domain %s: Joining node %d has global "
968 "heartbeat enabled but local node %d does not\n",
969 qr->qr_domain, qr->qr_node, dlm->node_num);
970 status = -EINVAL;
971 }
972 goto bail;
973 }
974
975 if (o2hb_global_heartbeat_active() && !qr->qr_numregions) {
976 mlog(ML_ERROR, "Domain %s: Local node %d has global "
977 "heartbeat enabled but joining node %d does not\n",
978 qr->qr_domain, dlm->node_num, qr->qr_node);
979 status = -EINVAL;
980 goto bail;
981 }
982
983 r = remote;
984 for (i = 0; i < qr->qr_numregions; ++i) {
985 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r);
986 r += O2HB_MAX_REGION_NAME_LEN;
987 }
988
Sunil Mushran770c4d82011-02-21 14:25:25 -0800989 localnr = min(O2NM_MAX_REGIONS, locallen/O2HB_MAX_REGION_NAME_LEN);
990 localnr = o2hb_get_all_regions(local, (u8)localnr);
Sunil Mushranea203442010-10-09 10:26:23 -0700991
992 /* compare local regions with remote */
993 l = local;
994 for (i = 0; i < localnr; ++i) {
995 foundit = 0;
996 r = remote;
997 for (j = 0; j <= qr->qr_numregions; ++j) {
998 if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) {
999 foundit = 1;
1000 break;
1001 }
1002 r += O2HB_MAX_REGION_NAME_LEN;
1003 }
1004 if (!foundit) {
1005 status = -EINVAL;
1006 mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
1007 "in local node %d but not in joining node %d\n",
1008 qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l,
1009 dlm->node_num, qr->qr_node);
1010 goto bail;
1011 }
1012 l += O2HB_MAX_REGION_NAME_LEN;
1013 }
1014
1015 /* compare remote with local regions */
1016 r = remote;
1017 for (i = 0; i < qr->qr_numregions; ++i) {
1018 foundit = 0;
1019 l = local;
1020 for (j = 0; j < localnr; ++j) {
1021 if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) {
1022 foundit = 1;
1023 break;
1024 }
1025 l += O2HB_MAX_REGION_NAME_LEN;
1026 }
1027 if (!foundit) {
1028 status = -EINVAL;
1029 mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
1030 "in joining node %d but not in local node %d\n",
1031 qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r,
1032 qr->qr_node, dlm->node_num);
1033 goto bail;
1034 }
1035 r += O2HB_MAX_REGION_NAME_LEN;
1036 }
1037
1038bail:
Sunil Mushranea203442010-10-09 10:26:23 -07001039 return status;
1040}
1041
1042static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map)
1043{
1044 struct dlm_query_region *qr = NULL;
1045 int status, ret = 0, i;
1046 char *p;
1047
Yury Norovb5c7e7e2021-08-14 14:17:03 -07001048 if (find_first_bit(node_map, O2NM_MAX_NODES) >= O2NM_MAX_NODES)
Sunil Mushranea203442010-10-09 10:26:23 -07001049 goto bail;
1050
1051 qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL);
1052 if (!qr) {
1053 ret = -ENOMEM;
1054 mlog_errno(ret);
1055 goto bail;
1056 }
1057
1058 qr->qr_node = dlm->node_num;
1059 qr->qr_namelen = strlen(dlm->name);
1060 memcpy(qr->qr_domain, dlm->name, qr->qr_namelen);
1061 /* if local hb, the numregions will be zero */
1062 if (o2hb_global_heartbeat_active())
1063 qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions,
1064 O2NM_MAX_REGIONS);
1065
1066 p = qr->qr_regions;
1067 for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN)
1068 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p);
1069
1070 i = -1;
1071 while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
1072 i + 1)) < O2NM_MAX_NODES) {
1073 if (i == dlm->node_num)
1074 continue;
1075
1076 mlog(0, "Sending regions to node %d\n", i);
1077
1078 ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr,
1079 sizeof(struct dlm_query_region),
1080 i, &status);
1081 if (ret >= 0)
1082 ret = status;
1083 if (ret) {
1084 mlog(ML_ERROR, "Region mismatch %d, node %d\n",
1085 ret, i);
1086 break;
1087 }
1088 }
1089
1090bail:
1091 kfree(qr);
1092 return ret;
1093}
1094
1095static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
1096 void *data, void **ret_data)
1097{
1098 struct dlm_query_region *qr;
1099 struct dlm_ctxt *dlm = NULL;
Sunil Mushran770c4d82011-02-21 14:25:25 -08001100 char *local = NULL;
Sunil Mushranea203442010-10-09 10:26:23 -07001101 int status = 0;
Sunil Mushranea203442010-10-09 10:26:23 -07001102
1103 qr = (struct dlm_query_region *) msg->buf;
1104
1105 mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node,
1106 qr->qr_domain);
1107
Sunil Mushran770c4d82011-02-21 14:25:25 -08001108 /* buffer used in dlm_mast_regions() */
1109 local = kmalloc(sizeof(qr->qr_regions), GFP_KERNEL);
Zhonghua Guoa35ad97c2014-04-03 14:47:02 -07001110 if (!local)
1111 return -ENOMEM;
Sunil Mushran770c4d82011-02-21 14:25:25 -08001112
Sunil Mushranea203442010-10-09 10:26:23 -07001113 status = -EINVAL;
1114
1115 spin_lock(&dlm_domain_lock);
1116 dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen);
1117 if (!dlm) {
1118 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1119 "before join domain\n", qr->qr_node, qr->qr_domain);
Zhonghua Guoa35ad97c2014-04-03 14:47:02 -07001120 goto out_domain_lock;
Sunil Mushranea203442010-10-09 10:26:23 -07001121 }
1122
1123 spin_lock(&dlm->spinlock);
Sunil Mushranea203442010-10-09 10:26:23 -07001124 if (dlm->joining_node != qr->qr_node) {
1125 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1126 "but joining node is %d\n", qr->qr_node, qr->qr_domain,
1127 dlm->joining_node);
Zhonghua Guoa35ad97c2014-04-03 14:47:02 -07001128 goto out_dlm_lock;
Sunil Mushranea203442010-10-09 10:26:23 -07001129 }
1130
1131 /* Support for global heartbeat was added in 1.1 */
1132 if (dlm->dlm_locking_proto.pv_major == 1 &&
1133 dlm->dlm_locking_proto.pv_minor == 0) {
1134 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1135 "but active dlm protocol is %d.%d\n", qr->qr_node,
1136 qr->qr_domain, dlm->dlm_locking_proto.pv_major,
1137 dlm->dlm_locking_proto.pv_minor);
Zhonghua Guoa35ad97c2014-04-03 14:47:02 -07001138 goto out_dlm_lock;
Sunil Mushranea203442010-10-09 10:26:23 -07001139 }
1140
Sunil Mushran770c4d82011-02-21 14:25:25 -08001141 status = dlm_match_regions(dlm, qr, local, sizeof(qr->qr_regions));
Sunil Mushranea203442010-10-09 10:26:23 -07001142
Zhonghua Guoa35ad97c2014-04-03 14:47:02 -07001143out_dlm_lock:
1144 spin_unlock(&dlm->spinlock);
1145
1146out_domain_lock:
Sunil Mushranea203442010-10-09 10:26:23 -07001147 spin_unlock(&dlm_domain_lock);
1148
Sunil Mushran770c4d82011-02-21 14:25:25 -08001149 kfree(local);
1150
Sunil Mushranea203442010-10-09 10:26:23 -07001151 return status;
1152}
1153
Sunil Mushran18cfdf12010-10-07 16:47:03 -07001154static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn)
1155{
1156 struct o2nm_node *local;
1157 struct dlm_node_info *remote;
1158 int i, j;
1159 int status = 0;
1160
1161 for (j = 0; j < qn->qn_numnodes; ++j)
1162 mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum,
1163 &(qn->qn_nodes[j].ni_ipv4_address),
1164 ntohs(qn->qn_nodes[j].ni_ipv4_port));
1165
1166 for (i = 0; i < O2NM_MAX_NODES && !status; ++i) {
1167 local = o2nm_get_node_by_num(i);
1168 remote = NULL;
1169 for (j = 0; j < qn->qn_numnodes; ++j) {
1170 if (qn->qn_nodes[j].ni_nodenum == i) {
1171 remote = &(qn->qn_nodes[j]);
1172 break;
1173 }
1174 }
1175
1176 if (!local && !remote)
1177 continue;
1178
1179 if ((local && !remote) || (!local && remote))
1180 status = -EINVAL;
1181
1182 if (!status &&
1183 ((remote->ni_nodenum != local->nd_num) ||
1184 (remote->ni_ipv4_port != local->nd_ipv4_port) ||
1185 (remote->ni_ipv4_address != local->nd_ipv4_address)))
1186 status = -EINVAL;
1187
1188 if (status) {
1189 if (remote && !local)
1190 mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
1191 "registered in joining node %d but not in "
1192 "local node %d\n", qn->qn_domain,
1193 remote->ni_nodenum,
1194 &(remote->ni_ipv4_address),
1195 ntohs(remote->ni_ipv4_port),
1196 qn->qn_nodenum, dlm->node_num);
1197 if (local && !remote)
1198 mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
1199 "registered in local node %d but not in "
1200 "joining node %d\n", qn->qn_domain,
1201 local->nd_num, &(local->nd_ipv4_address),
1202 ntohs(local->nd_ipv4_port),
1203 dlm->node_num, qn->qn_nodenum);
1204 BUG_ON((!local && !remote));
1205 }
1206
1207 if (local)
1208 o2nm_node_put(local);
1209 }
1210
1211 return status;
1212}
1213
1214static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map)
1215{
1216 struct dlm_query_nodeinfo *qn = NULL;
1217 struct o2nm_node *node;
1218 int ret = 0, status, count, i;
1219
Yury Norovb5c7e7e2021-08-14 14:17:03 -07001220 if (find_first_bit(node_map, O2NM_MAX_NODES) >= O2NM_MAX_NODES)
Sunil Mushran18cfdf12010-10-07 16:47:03 -07001221 goto bail;
1222
1223 qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL);
1224 if (!qn) {
1225 ret = -ENOMEM;
1226 mlog_errno(ret);
1227 goto bail;
1228 }
1229
1230 for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) {
1231 node = o2nm_get_node_by_num(i);
1232 if (!node)
1233 continue;
1234 qn->qn_nodes[count].ni_nodenum = node->nd_num;
1235 qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port;
1236 qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address;
1237 mlog(0, "Node %3d, %pI4:%u\n", node->nd_num,
1238 &(node->nd_ipv4_address), ntohs(node->nd_ipv4_port));
1239 ++count;
1240 o2nm_node_put(node);
1241 }
1242
1243 qn->qn_nodenum = dlm->node_num;
1244 qn->qn_numnodes = count;
1245 qn->qn_namelen = strlen(dlm->name);
1246 memcpy(qn->qn_domain, dlm->name, qn->qn_namelen);
1247
1248 i = -1;
1249 while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
1250 i + 1)) < O2NM_MAX_NODES) {
1251 if (i == dlm->node_num)
1252 continue;
1253
1254 mlog(0, "Sending nodeinfo to node %d\n", i);
1255
1256 ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
1257 qn, sizeof(struct dlm_query_nodeinfo),
1258 i, &status);
1259 if (ret >= 0)
1260 ret = status;
1261 if (ret) {
1262 mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i);
1263 break;
1264 }
1265 }
1266
1267bail:
1268 kfree(qn);
1269 return ret;
1270}
1271
1272static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len,
1273 void *data, void **ret_data)
1274{
1275 struct dlm_query_nodeinfo *qn;
1276 struct dlm_ctxt *dlm = NULL;
1277 int locked = 0, status = -EINVAL;
1278
1279 qn = (struct dlm_query_nodeinfo *) msg->buf;
1280
1281 mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum,
1282 qn->qn_domain);
1283
1284 spin_lock(&dlm_domain_lock);
1285 dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen);
1286 if (!dlm) {
1287 mlog(ML_ERROR, "Node %d queried nodes on domain %s before "
1288 "join domain\n", qn->qn_nodenum, qn->qn_domain);
1289 goto bail;
1290 }
1291
1292 spin_lock(&dlm->spinlock);
1293 locked = 1;
1294 if (dlm->joining_node != qn->qn_nodenum) {
1295 mlog(ML_ERROR, "Node %d queried nodes on domain %s but "
1296 "joining node is %d\n", qn->qn_nodenum, qn->qn_domain,
1297 dlm->joining_node);
1298 goto bail;
1299 }
1300
1301 /* Support for node query was added in 1.1 */
1302 if (dlm->dlm_locking_proto.pv_major == 1 &&
1303 dlm->dlm_locking_proto.pv_minor == 0) {
1304 mlog(ML_ERROR, "Node %d queried nodes on domain %s "
1305 "but active dlm protocol is %d.%d\n", qn->qn_nodenum,
1306 qn->qn_domain, dlm->dlm_locking_proto.pv_major,
1307 dlm->dlm_locking_proto.pv_minor);
1308 goto bail;
1309 }
1310
1311 status = dlm_match_nodes(dlm, qn);
1312
1313bail:
1314 if (locked)
1315 spin_unlock(&dlm->spinlock);
1316 spin_unlock(&dlm_domain_lock);
1317
1318 return status;
1319}
1320
Kurt Hackeld74c9802007-01-17 17:04:25 -08001321static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
1322 void **ret_data)
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001323{
1324 struct dlm_cancel_join *cancel;
1325 struct dlm_ctxt *dlm = NULL;
1326
1327 cancel = (struct dlm_cancel_join *) msg->buf;
1328
1329 mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx,
1330 cancel->domain);
1331
1332 spin_lock(&dlm_domain_lock);
1333 dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len);
1334
1335 if (dlm) {
1336 spin_lock(&dlm->spinlock);
1337
1338 /* Yikes, this guy wants to cancel his join. No
1339 * problem, we simply cleanup our join state. */
1340 BUG_ON(dlm->joining_node != cancel->node_idx);
1341 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
1342
1343 spin_unlock(&dlm->spinlock);
1344 }
1345 spin_unlock(&dlm_domain_lock);
1346
1347 return 0;
1348}
1349
1350static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm,
1351 unsigned int node)
1352{
1353 int status;
1354 struct dlm_cancel_join cancel_msg;
1355
1356 memset(&cancel_msg, 0, sizeof(cancel_msg));
1357 cancel_msg.node_idx = dlm->node_num;
1358 cancel_msg.name_len = strlen(dlm->name);
1359 memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len);
1360
1361 status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
1362 &cancel_msg, sizeof(cancel_msg), node,
1363 NULL);
1364 if (status < 0) {
Wengang Wanga5196ec2010-03-30 12:09:22 +08001365 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1366 "node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
1367 node);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001368 goto bail;
1369 }
1370
1371bail:
1372 return status;
1373}
1374
1375/* map_size should be in bytes. */
1376static int dlm_send_join_cancels(struct dlm_ctxt *dlm,
1377 unsigned long *node_map,
1378 unsigned int map_size)
1379{
1380 int status, tmpstat;
Jun Piao8d67d3c2016-03-15 14:53:23 -07001381 int node;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001382
1383 if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) *
1384 sizeof(unsigned long))) {
1385 mlog(ML_ERROR,
1386 "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
Andrew Morton3a4780a2008-02-29 01:56:06 -08001387 map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES));
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001388 return -EINVAL;
1389 }
1390
1391 status = 0;
1392 node = -1;
1393 while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
1394 node + 1)) < O2NM_MAX_NODES) {
1395 if (node == dlm->node_num)
1396 continue;
1397
1398 tmpstat = dlm_send_one_join_cancel(dlm, node);
1399 if (tmpstat) {
1400 mlog(ML_ERROR, "Error return %d cancelling join on "
1401 "node %d\n", tmpstat, node);
1402 if (!status)
1403 status = tmpstat;
1404 }
1405 }
1406
1407 if (status)
1408 mlog_errno(status);
1409 return status;
1410}
1411
1412static int dlm_request_join(struct dlm_ctxt *dlm,
1413 int node,
Joel Beckerd24fbcd2008-01-25 17:02:21 -08001414 enum dlm_query_join_response_code *response)
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001415{
Joel Beckerd24fbcd2008-01-25 17:02:21 -08001416 int status;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001417 struct dlm_query_join_request join_msg;
Joel Becker0f71b7b2008-02-12 14:56:25 -08001418 struct dlm_query_join_packet packet;
1419 u32 join_resp;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001420
1421 mlog(0, "querying node %d\n", node);
1422
1423 memset(&join_msg, 0, sizeof(join_msg));
1424 join_msg.node_idx = dlm->node_num;
1425 join_msg.name_len = strlen(dlm->name);
1426 memcpy(join_msg.domain, dlm->name, join_msg.name_len);
Joel Beckerd24fbcd2008-01-25 17:02:21 -08001427 join_msg.dlm_proto = dlm->dlm_locking_proto;
1428 join_msg.fs_proto = dlm->fs_locking_proto;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001429
Srinivas Eeda1faf2892007-01-29 15:31:35 -08001430 /* copy live node map to join message */
1431 byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES);
1432
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001433 status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg,
Wengang Wanga5196ec2010-03-30 12:09:22 +08001434 sizeof(join_msg), node, &join_resp);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001435 if (status < 0 && status != -ENOPROTOOPT) {
Wengang Wanga5196ec2010-03-30 12:09:22 +08001436 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1437 "node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
1438 node);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001439 goto bail;
1440 }
Joel Becker0f71b7b2008-02-12 14:56:25 -08001441 dlm_query_join_wire_to_packet(join_resp, &packet);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001442
1443 /* -ENOPROTOOPT from the net code means the other side isn't
1444 listening for our message type -- that's fine, it means
1445 his dlm isn't up, so we can consider him a 'yes' but not
1446 joined into the domain. */
1447 if (status == -ENOPROTOOPT) {
1448 status = 0;
1449 *response = JOIN_OK_NO_MAP;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001450 } else {
Norton.Zhu72f6fe12015-09-04 15:44:28 -07001451 *response = packet.code;
1452 switch (packet.code) {
1453 case JOIN_DISALLOW:
1454 case JOIN_OK_NO_MAP:
1455 break;
1456 case JOIN_PROTOCOL_MISMATCH:
1457 mlog(ML_NOTICE,
1458 "This node requested DLM locking protocol %u.%u and "
1459 "filesystem locking protocol %u.%u. At least one of "
1460 "the protocol versions on node %d is not compatible, "
1461 "disconnecting\n",
1462 dlm->dlm_locking_proto.pv_major,
1463 dlm->dlm_locking_proto.pv_minor,
1464 dlm->fs_locking_proto.pv_major,
1465 dlm->fs_locking_proto.pv_minor,
1466 node);
1467 status = -EPROTO;
1468 break;
1469 case JOIN_OK:
1470 /* Use the same locking protocol as the remote node */
1471 dlm->dlm_locking_proto.pv_minor = packet.dlm_minor;
1472 dlm->fs_locking_proto.pv_minor = packet.fs_minor;
1473 mlog(0,
1474 "Node %d responds JOIN_OK with DLM locking protocol "
1475 "%u.%u and fs locking protocol %u.%u\n",
1476 node,
1477 dlm->dlm_locking_proto.pv_major,
1478 dlm->dlm_locking_proto.pv_minor,
1479 dlm->fs_locking_proto.pv_major,
1480 dlm->fs_locking_proto.pv_minor);
1481 break;
1482 default:
1483 status = -EINVAL;
1484 mlog(ML_ERROR, "invalid response %d from node %u\n",
1485 packet.code, node);
1486 /* Reset response to JOIN_DISALLOW */
1487 *response = JOIN_DISALLOW;
1488 break;
1489 }
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001490 }
1491
1492 mlog(0, "status %d, node %d response is %d\n", status, node,
Joel Becker0f71b7b2008-02-12 14:56:25 -08001493 *response);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001494
1495bail:
1496 return status;
1497}
1498
1499static int dlm_send_one_join_assert(struct dlm_ctxt *dlm,
1500 unsigned int node)
1501{
1502 int status;
Xue jiufei01c62222014-06-04 16:06:14 -07001503 int ret;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001504 struct dlm_assert_joined assert_msg;
1505
1506 mlog(0, "Sending join assert to node %u\n", node);
1507
1508 memset(&assert_msg, 0, sizeof(assert_msg));
1509 assert_msg.node_idx = dlm->node_num;
1510 assert_msg.name_len = strlen(dlm->name);
1511 memcpy(assert_msg.domain, dlm->name, assert_msg.name_len);
1512
1513 status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
1514 &assert_msg, sizeof(assert_msg), node,
Xue jiufei01c62222014-06-04 16:06:14 -07001515 &ret);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001516 if (status < 0)
Wengang Wanga5196ec2010-03-30 12:09:22 +08001517 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1518 "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
1519 node);
Xue jiufei01c62222014-06-04 16:06:14 -07001520 else
1521 status = ret;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001522
1523 return status;
1524}
1525
1526static void dlm_send_join_asserts(struct dlm_ctxt *dlm,
1527 unsigned long *node_map)
1528{
1529 int status, node, live;
1530
1531 status = 0;
1532 node = -1;
1533 while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
1534 node + 1)) < O2NM_MAX_NODES) {
1535 if (node == dlm->node_num)
1536 continue;
1537
1538 do {
1539 /* It is very important that this message be
1540 * received so we spin until either the node
1541 * has died or it gets the message. */
1542 status = dlm_send_one_join_assert(dlm, node);
1543
1544 spin_lock(&dlm->spinlock);
1545 live = test_bit(node, dlm->live_nodes_map);
1546 spin_unlock(&dlm->spinlock);
1547
1548 if (status) {
1549 mlog(ML_ERROR, "Error return %d asserting "
1550 "join on node %d\n", status, node);
1551
1552 /* give us some time between errors... */
1553 if (live)
1554 msleep(DLM_DOMAIN_BACKOFF_MS);
1555 }
1556 } while (status && live);
1557 }
1558}
1559
1560struct domain_join_ctxt {
1561 unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1562 unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1563};
1564
1565static int dlm_should_restart_join(struct dlm_ctxt *dlm,
1566 struct domain_join_ctxt *ctxt,
Joel Beckerd24fbcd2008-01-25 17:02:21 -08001567 enum dlm_query_join_response_code response)
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001568{
1569 int ret;
1570
1571 if (response == JOIN_DISALLOW) {
1572 mlog(0, "Latest response of disallow -- should restart\n");
1573 return 1;
1574 }
1575
1576 spin_lock(&dlm->spinlock);
1577 /* For now, we restart the process if the node maps have
1578 * changed at all */
1579 ret = memcmp(ctxt->live_map, dlm->live_nodes_map,
1580 sizeof(dlm->live_nodes_map));
1581 spin_unlock(&dlm->spinlock);
1582
1583 if (ret)
1584 mlog(0, "Node maps changed -- should restart\n");
1585
1586 return ret;
1587}
1588
1589static int dlm_try_to_join_domain(struct dlm_ctxt *dlm)
1590{
1591 int status = 0, tmpstat, node;
1592 struct domain_join_ctxt *ctxt;
Joel Beckerd24fbcd2008-01-25 17:02:21 -08001593 enum dlm_query_join_response_code response = JOIN_DISALLOW;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001594
Tao Maef6b6892011-02-21 11:10:44 +08001595 mlog(0, "%p", dlm);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001596
Robert P. J. Daycd861282006-12-13 00:34:52 -08001597 ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001598 if (!ctxt) {
1599 status = -ENOMEM;
1600 mlog_errno(status);
1601 goto bail;
1602 }
1603
1604 /* group sem locking should work for us here -- we're already
1605 * registered for heartbeat events so filling this should be
1606 * atomic wrt getting those handlers called. */
1607 o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map));
1608
1609 spin_lock(&dlm->spinlock);
1610 memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map));
1611
1612 __dlm_set_joining_node(dlm, dlm->node_num);
1613
1614 spin_unlock(&dlm->spinlock);
1615
1616 node = -1;
1617 while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES,
1618 node + 1)) < O2NM_MAX_NODES) {
1619 if (node == dlm->node_num)
1620 continue;
1621
1622 status = dlm_request_join(dlm, node, &response);
1623 if (status < 0) {
1624 mlog_errno(status);
1625 goto bail;
1626 }
1627
1628 /* Ok, either we got a response or the node doesn't have a
1629 * dlm up. */
1630 if (response == JOIN_OK)
1631 set_bit(node, ctxt->yes_resp_map);
1632
1633 if (dlm_should_restart_join(dlm, ctxt, response)) {
1634 status = -EAGAIN;
1635 goto bail;
1636 }
1637 }
1638
1639 mlog(0, "Yay, done querying nodes!\n");
1640
1641 /* Yay, everyone agree's we can join the domain. My domain is
1642 * comprised of all nodes who were put in the
1643 * yes_resp_map. Copy that into our domain map and send a join
1644 * assert message to clean up everyone elses state. */
1645 spin_lock(&dlm->spinlock);
1646 memcpy(dlm->domain_map, ctxt->yes_resp_map,
1647 sizeof(ctxt->yes_resp_map));
1648 set_bit(dlm->node_num, dlm->domain_map);
1649 spin_unlock(&dlm->spinlock);
1650
Sunil Mushran18cfdf12010-10-07 16:47:03 -07001651 /* Support for global heartbeat and node info was added in 1.1 */
Sunil Mushran4da6dc22011-05-04 10:27:10 -07001652 if (dlm->dlm_locking_proto.pv_major > 1 ||
1653 dlm->dlm_locking_proto.pv_minor > 0) {
Sunil Mushran18cfdf12010-10-07 16:47:03 -07001654 status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map);
1655 if (status) {
1656 mlog_errno(status);
1657 goto bail;
1658 }
Sunil Mushranea203442010-10-09 10:26:23 -07001659 status = dlm_send_regions(dlm, ctxt->yes_resp_map);
1660 if (status) {
1661 mlog_errno(status);
1662 goto bail;
1663 }
1664 }
1665
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001666 dlm_send_join_asserts(dlm, ctxt->yes_resp_map);
1667
1668 /* Joined state *must* be set before the joining node
1669 * information, otherwise the query_join handler may read no
1670 * current joiner but a state of NEW and tell joining nodes
1671 * we're not in the domain. */
1672 spin_lock(&dlm_domain_lock);
1673 dlm->dlm_state = DLM_CTXT_JOINED;
1674 dlm->num_joins++;
1675 spin_unlock(&dlm_domain_lock);
1676
1677bail:
1678 spin_lock(&dlm->spinlock);
1679 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
Sunil Mushran8decab32011-07-24 10:23:54 -07001680 if (!status) {
1681 printk(KERN_NOTICE "o2dlm: Joining domain %s ", dlm->name);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001682 __dlm_print_nodes(dlm);
Sunil Mushran8decab32011-07-24 10:23:54 -07001683 }
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001684 spin_unlock(&dlm->spinlock);
1685
1686 if (ctxt) {
1687 /* Do we need to send a cancel message to any nodes? */
1688 if (status < 0) {
1689 tmpstat = dlm_send_join_cancels(dlm,
1690 ctxt->yes_resp_map,
1691 sizeof(ctxt->yes_resp_map));
1692 if (tmpstat < 0)
1693 mlog_errno(tmpstat);
1694 }
1695 kfree(ctxt);
1696 }
1697
1698 mlog(0, "returning %d\n", status);
1699 return status;
1700}
1701
1702static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm)
1703{
Sunil Mushran58a31582010-12-14 14:14:29 -08001704 o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up);
1705 o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001706 o2net_unregister_handler_list(&dlm->dlm_domain_handlers);
1707}
1708
1709static int dlm_register_domain_handlers(struct dlm_ctxt *dlm)
1710{
1711 int status;
1712
1713 mlog(0, "registering handlers.\n");
1714
1715 o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB,
1716 dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI);
Joseph Qicdd09f42015-09-04 15:43:57 -07001717 o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB,
1718 dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI);
1719
Sunil Mushran58a31582010-12-14 14:14:29 -08001720 status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001721 if (status)
1722 goto bail;
1723
Sunil Mushran58a31582010-12-14 14:14:29 -08001724 status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001725 if (status)
1726 goto bail;
1727
1728 status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key,
1729 sizeof(struct dlm_master_request),
1730 dlm_master_request_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001731 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001732 if (status)
1733 goto bail;
1734
1735 status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key,
1736 sizeof(struct dlm_assert_master),
1737 dlm_assert_master_handler,
Kurt Hackel3b8118c2007-01-17 17:05:53 -08001738 dlm, dlm_assert_master_post_handler,
1739 &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001740 if (status)
1741 goto bail;
1742
1743 status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key,
1744 sizeof(struct dlm_create_lock),
1745 dlm_create_lock_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001746 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001747 if (status)
1748 goto bail;
1749
1750 status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key,
1751 DLM_CONVERT_LOCK_MAX_LEN,
1752 dlm_convert_lock_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001753 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001754 if (status)
1755 goto bail;
1756
1757 status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key,
1758 DLM_UNLOCK_LOCK_MAX_LEN,
1759 dlm_unlock_lock_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001760 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001761 if (status)
1762 goto bail;
1763
1764 status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key,
1765 DLM_PROXY_AST_MAX_LEN,
1766 dlm_proxy_ast_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001767 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001768 if (status)
1769 goto bail;
1770
1771 status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key,
1772 sizeof(struct dlm_exit_domain),
1773 dlm_exit_domain_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001774 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001775 if (status)
1776 goto bail;
1777
Kurt Hackelba2bf212006-12-01 14:47:20 -08001778 status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key,
1779 sizeof(struct dlm_deref_lockres),
1780 dlm_deref_lockres_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001781 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackelba2bf212006-12-01 14:47:20 -08001782 if (status)
1783 goto bail;
1784
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001785 status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key,
1786 sizeof(struct dlm_migrate_request),
1787 dlm_migrate_request_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001788 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001789 if (status)
1790 goto bail;
1791
1792 status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key,
1793 DLM_MIG_LOCKRES_MAX_LEN,
1794 dlm_mig_lockres_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001795 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001796 if (status)
1797 goto bail;
1798
1799 status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key,
1800 sizeof(struct dlm_master_requery),
1801 dlm_master_requery_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001802 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001803 if (status)
1804 goto bail;
1805
1806 status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key,
1807 sizeof(struct dlm_lock_request),
1808 dlm_request_all_locks_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001809 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001810 if (status)
1811 goto bail;
1812
1813 status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key,
1814 sizeof(struct dlm_reco_data_done),
1815 dlm_reco_data_done_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001816 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001817 if (status)
1818 goto bail;
1819
1820 status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key,
1821 sizeof(struct dlm_begin_reco),
1822 dlm_begin_reco_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001823 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001824 if (status)
1825 goto bail;
1826
1827 status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key,
1828 sizeof(struct dlm_finalize_reco),
1829 dlm_finalize_reco_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08001830 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001831 if (status)
1832 goto bail;
1833
Sunil Mushranbddefde2011-05-19 14:34:11 -07001834 status = o2net_register_handler(DLM_BEGIN_EXIT_DOMAIN_MSG, dlm->key,
1835 sizeof(struct dlm_exit_domain),
1836 dlm_begin_exit_domain_handler,
1837 dlm, NULL, &dlm->dlm_domain_handlers);
xuejiufei60d663c2016-03-15 14:53:08 -07001838 if (status)
1839 goto bail;
Sunil Mushranbddefde2011-05-19 14:34:11 -07001840
xuejiufei60d663c2016-03-15 14:53:08 -07001841 status = o2net_register_handler(DLM_DEREF_LOCKRES_DONE, dlm->key,
1842 sizeof(struct dlm_deref_lockres_done),
1843 dlm_deref_lockres_done_handler,
1844 dlm, NULL, &dlm->dlm_domain_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001845bail:
1846 if (status)
1847 dlm_unregister_domain_handlers(dlm);
1848
1849 return status;
1850}
1851
1852static int dlm_join_domain(struct dlm_ctxt *dlm)
1853{
1854 int status;
Sunil Mushran0dd82142007-01-29 15:44:27 -08001855 unsigned int backoff;
1856 unsigned int total_backoff = 0;
Joseph Qi5afc44e2015-11-05 18:44:13 -08001857 char wq_name[O2NM_MAX_NAME_LEN];
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001858
1859 BUG_ON(!dlm);
1860
1861 mlog(0, "Join domain %s\n", dlm->name);
1862
1863 status = dlm_register_domain_handlers(dlm);
1864 if (status) {
1865 mlog_errno(status);
1866 goto bail;
1867 }
1868
1869 status = dlm_launch_thread(dlm);
1870 if (status < 0) {
1871 mlog_errno(status);
1872 goto bail;
1873 }
1874
1875 status = dlm_launch_recovery_thread(dlm);
1876 if (status < 0) {
1877 mlog_errno(status);
1878 goto bail;
1879 }
1880
Greg Kroah-Hartmane5815952019-07-11 20:53:12 -07001881 dlm_debug_init(dlm);
Zongxun Wang181a9a02014-04-03 14:46:45 -07001882
Joseph Qi5afc44e2015-11-05 18:44:13 -08001883 snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name);
Bhaktipriya Shridhar055fdcf2016-10-07 16:57:17 -07001884 dlm->dlm_worker = alloc_workqueue(wq_name, WQ_MEM_RECLAIM, 0);
Kurt Hackel3156d262006-05-01 14:39:29 -07001885 if (!dlm->dlm_worker) {
1886 status = -ENOMEM;
1887 mlog_errno(status);
1888 goto bail;
1889 }
1890
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001891 do {
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001892 status = dlm_try_to_join_domain(dlm);
1893
1894 /* If we're racing another node to the join, then we
1895 * need to back off temporarily and let them
1896 * complete. */
Sunil Mushran0dd82142007-01-29 15:44:27 -08001897#define DLM_JOIN_TIMEOUT_MSECS 90000
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001898 if (status == -EAGAIN) {
1899 if (signal_pending(current)) {
1900 status = -ERESTARTSYS;
1901 goto bail;
1902 }
1903
Xue jiufei7567c142014-08-06 16:03:56 -07001904 if (total_backoff > DLM_JOIN_TIMEOUT_MSECS) {
Sunil Mushran0dd82142007-01-29 15:44:27 -08001905 status = -ERESTARTSYS;
1906 mlog(ML_NOTICE, "Timed out joining dlm domain "
1907 "%s after %u msecs\n", dlm->name,
Xue jiufei7567c142014-08-06 16:03:56 -07001908 total_backoff);
Sunil Mushran0dd82142007-01-29 15:44:27 -08001909 goto bail;
1910 }
1911
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001912 /*
1913 * <chip> After you!
1914 * <dale> No, after you!
1915 * <chip> I insist!
1916 * <dale> But you first!
1917 * ...
1918 */
1919 backoff = (unsigned int)(jiffies & 0x3);
1920 backoff *= DLM_DOMAIN_BACKOFF_MS;
Sunil Mushran0dd82142007-01-29 15:44:27 -08001921 total_backoff += backoff;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001922 mlog(0, "backoff %d\n", backoff);
1923 msleep(backoff);
1924 }
1925 } while (status == -EAGAIN);
1926
1927 if (status < 0) {
1928 mlog_errno(status);
1929 goto bail;
1930 }
1931
1932 status = 0;
1933bail:
1934 wake_up(&dlm_domain_events);
1935
1936 if (status) {
1937 dlm_unregister_domain_handlers(dlm);
1938 dlm_complete_thread(dlm);
1939 dlm_complete_recovery_thread(dlm);
Kurt Hackel3156d262006-05-01 14:39:29 -07001940 dlm_destroy_dlm_worker(dlm);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001941 }
1942
1943 return status;
1944}
1945
1946static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
1947 u32 key)
1948{
1949 int i;
Sunil Mushran6325b4a2008-03-10 15:16:22 -07001950 int ret;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001951 struct dlm_ctxt *dlm = NULL;
1952
Robert P. J. Daycd861282006-12-13 00:34:52 -08001953 dlm = kzalloc(sizeof(*dlm), GFP_KERNEL);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001954 if (!dlm) {
Joseph Qi190a7722014-10-09 15:24:54 -07001955 ret = -ENOMEM;
1956 mlog_errno(ret);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001957 goto leave;
1958 }
1959
Julia Lawall316ce2b2010-05-14 21:30:48 +02001960 dlm->name = kstrdup(domain, GFP_KERNEL);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001961 if (dlm->name == NULL) {
Joseph Qi190a7722014-10-09 15:24:54 -07001962 ret = -ENOMEM;
1963 mlog_errno(ret);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001964 goto leave;
1965 }
1966
Daniel Phillips03d864c2006-03-10 18:08:16 -08001967 dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES);
Mark Fasheh81f20942006-02-28 17:31:22 -08001968 if (!dlm->lockres_hash) {
Joseph Qi190a7722014-10-09 15:24:54 -07001969 ret = -ENOMEM;
1970 mlog_errno(ret);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001971 goto leave;
1972 }
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001973
Daniel Phillips03d864c2006-03-10 18:08:16 -08001974 for (i = 0; i < DLM_HASH_BUCKETS; i++)
1975 INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i));
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001976
Sunil Mushrane2b66dd2009-02-26 15:00:40 -08001977 dlm->master_hash = (struct hlist_head **)
1978 dlm_alloc_pagevec(DLM_HASH_PAGES);
1979 if (!dlm->master_hash) {
Joseph Qi190a7722014-10-09 15:24:54 -07001980 ret = -ENOMEM;
1981 mlog_errno(ret);
Sunil Mushrane2b66dd2009-02-26 15:00:40 -08001982 goto leave;
1983 }
1984
1985 for (i = 0; i < DLM_HASH_BUCKETS; i++)
1986 INIT_HLIST_HEAD(dlm_master_hash(dlm, i));
1987
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001988 dlm->key = key;
1989 dlm->node_num = o2nm_this_node();
1990
Greg Kroah-Hartman5e7a3ed2019-09-23 15:33:15 -07001991 dlm_create_debugfs_subroot(dlm);
Sunil Mushran6325b4a2008-03-10 15:16:22 -07001992
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001993 spin_lock_init(&dlm->spinlock);
1994 spin_lock_init(&dlm->master_lock);
1995 spin_lock_init(&dlm->ast_lock);
Sunil Mushranb0d4f8172008-12-16 15:49:22 -08001996 spin_lock_init(&dlm->track_lock);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001997 INIT_LIST_HEAD(&dlm->list);
1998 INIT_LIST_HEAD(&dlm->dirty_list);
1999 INIT_LIST_HEAD(&dlm->reco.resources);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002000 INIT_LIST_HEAD(&dlm->reco.node_data);
2001 INIT_LIST_HEAD(&dlm->purge_list);
2002 INIT_LIST_HEAD(&dlm->dlm_domain_handlers);
Sunil Mushran29576f82008-03-10 15:16:21 -07002003 INIT_LIST_HEAD(&dlm->tracking_list);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002004 dlm->reco.state = 0;
2005
2006 INIT_LIST_HEAD(&dlm->pending_asts);
2007 INIT_LIST_HEAD(&dlm->pending_basts);
2008
2009 mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n",
2010 dlm->recovery_map, &(dlm->recovery_map[0]));
2011
2012 memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map));
2013 memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map));
2014 memset(dlm->domain_map, 0, sizeof(dlm->domain_map));
2015
2016 dlm->dlm_thread_task = NULL;
2017 dlm->dlm_reco_thread_task = NULL;
Kurt Hackel3156d262006-05-01 14:39:29 -07002018 dlm->dlm_worker = NULL;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002019 init_waitqueue_head(&dlm->dlm_thread_wq);
2020 init_waitqueue_head(&dlm->dlm_reco_thread_wq);
2021 init_waitqueue_head(&dlm->reco.event);
2022 init_waitqueue_head(&dlm->ast_wq);
2023 init_waitqueue_head(&dlm->migration_wq);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002024 INIT_LIST_HEAD(&dlm->mle_hb_events);
2025
2026 dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN;
2027 init_waitqueue_head(&dlm->dlm_join_events);
2028
piaojun60c7ec92018-04-05 16:19:11 -07002029 dlm->migrate_done = 0;
2030
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002031 dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
2032 dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002033
Sunil Mushran68007912009-02-26 15:00:44 -08002034 atomic_set(&dlm->res_tot_count, 0);
2035 atomic_set(&dlm->res_cur_count, 0);
Sunil Mushran2041d8f2009-02-26 15:00:43 -08002036 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) {
2037 atomic_set(&dlm->mle_tot_count[i], 0);
2038 atomic_set(&dlm->mle_cur_count[i], 0);
2039 }
2040
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002041 spin_lock_init(&dlm->work_lock);
2042 INIT_LIST_HEAD(&dlm->work_list);
David Howellsc4028952006-11-22 14:57:56 +00002043 INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002044
2045 kref_init(&dlm->dlm_refs);
2046 dlm->dlm_state = DLM_CTXT_NEW;
2047
2048 INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks);
2049
2050 mlog(0, "context init: refcount %u\n",
Peter Zijlstra2c935bc2016-11-14 17:29:48 +01002051 kref_read(&dlm->dlm_refs));
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002052
Greg Kroah-Hartman5e7a3ed2019-09-23 15:33:15 -07002053 ret = 0;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002054leave:
Joseph Qi190a7722014-10-09 15:24:54 -07002055 if (ret < 0 && dlm) {
2056 if (dlm->master_hash)
2057 dlm_free_pagevec((void **)dlm->master_hash,
2058 DLM_HASH_PAGES);
2059
2060 if (dlm->lockres_hash)
2061 dlm_free_pagevec((void **)dlm->lockres_hash,
2062 DLM_HASH_PAGES);
2063
2064 kfree(dlm->name);
2065 kfree(dlm);
2066 dlm = NULL;
2067 }
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002068 return dlm;
2069}
2070
2071/*
Joel Beckerd24fbcd2008-01-25 17:02:21 -08002072 * Compare a requested locking protocol version against the current one.
2073 *
2074 * If the major numbers are different, they are incompatible.
2075 * If the current minor is greater than the request, they are incompatible.
2076 * If the current minor is less than or equal to the request, they are
2077 * compatible, and the requester should run at the current minor version.
2078 */
2079static int dlm_protocol_compare(struct dlm_protocol_version *existing,
2080 struct dlm_protocol_version *request)
2081{
2082 if (existing->pv_major != request->pv_major)
2083 return 1;
2084
2085 if (existing->pv_minor > request->pv_minor)
2086 return 1;
2087
2088 if (existing->pv_minor < request->pv_minor)
2089 request->pv_minor = existing->pv_minor;
2090
2091 return 0;
2092}
2093
2094/*
2095 * dlm_register_domain: one-time setup per "domain".
2096 *
2097 * The filesystem passes in the requested locking version via proto.
2098 * If registration was successful, proto will contain the negotiated
2099 * locking protocol.
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002100 */
2101struct dlm_ctxt * dlm_register_domain(const char *domain,
Joel Beckerd24fbcd2008-01-25 17:02:21 -08002102 u32 key,
2103 struct dlm_protocol_version *fs_proto)
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002104{
2105 int ret;
2106 struct dlm_ctxt *dlm = NULL;
2107 struct dlm_ctxt *new_ctxt = NULL;
2108
Dan Carpentere3723572010-07-10 16:33:36 +02002109 if (strlen(domain) >= O2NM_MAX_NAME_LEN) {
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002110 ret = -ENAMETOOLONG;
2111 mlog(ML_ERROR, "domain name length too long\n");
2112 goto leave;
2113 }
2114
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002115 mlog(0, "register called for domain \"%s\"\n", domain);
2116
2117retry:
2118 dlm = NULL;
2119 if (signal_pending(current)) {
2120 ret = -ERESTARTSYS;
2121 mlog_errno(ret);
2122 goto leave;
2123 }
2124
2125 spin_lock(&dlm_domain_lock);
2126
2127 dlm = __dlm_lookup_domain(domain);
2128 if (dlm) {
2129 if (dlm->dlm_state != DLM_CTXT_JOINED) {
2130 spin_unlock(&dlm_domain_lock);
2131
2132 mlog(0, "This ctxt is not joined yet!\n");
2133 wait_event_interruptible(dlm_domain_events,
2134 dlm_wait_on_domain_helper(
2135 domain));
2136 goto retry;
2137 }
2138
Joel Beckerd24fbcd2008-01-25 17:02:21 -08002139 if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) {
Julia Lawall64692722010-05-26 17:58:53 +02002140 spin_unlock(&dlm_domain_lock);
Joel Beckerd24fbcd2008-01-25 17:02:21 -08002141 mlog(ML_ERROR,
2142 "Requested locking protocol version is not "
2143 "compatible with already registered domain "
2144 "\"%s\"\n", domain);
2145 ret = -EPROTO;
2146 goto leave;
2147 }
2148
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002149 __dlm_get(dlm);
2150 dlm->num_joins++;
2151
2152 spin_unlock(&dlm_domain_lock);
2153
2154 ret = 0;
2155 goto leave;
2156 }
2157
2158 /* doesn't exist */
2159 if (!new_ctxt) {
2160 spin_unlock(&dlm_domain_lock);
2161
2162 new_ctxt = dlm_alloc_ctxt(domain, key);
2163 if (new_ctxt)
2164 goto retry;
2165
2166 ret = -ENOMEM;
2167 mlog_errno(ret);
2168 goto leave;
2169 }
2170
2171 /* a little variable switch-a-roo here... */
2172 dlm = new_ctxt;
2173 new_ctxt = NULL;
2174
2175 /* add the new domain */
2176 list_add_tail(&dlm->list, &dlm_domains);
2177 spin_unlock(&dlm_domain_lock);
2178
Joel Beckerd24fbcd2008-01-25 17:02:21 -08002179 /*
2180 * Pass the locking protocol version into the join. If the join
2181 * succeeds, it will have the negotiated protocol set.
2182 */
2183 dlm->dlm_locking_proto = dlm_protocol;
2184 dlm->fs_locking_proto = *fs_proto;
2185
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002186 ret = dlm_join_domain(dlm);
2187 if (ret) {
2188 mlog_errno(ret);
2189 dlm_put(dlm);
2190 goto leave;
2191 }
2192
Joel Beckerd24fbcd2008-01-25 17:02:21 -08002193 /* Tell the caller what locking protocol we negotiated */
2194 *fs_proto = dlm->fs_locking_proto;
2195
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002196 ret = 0;
2197leave:
2198 if (new_ctxt)
2199 dlm_free_ctxt_mem(new_ctxt);
2200
2201 if (ret < 0)
2202 dlm = ERR_PTR(ret);
2203
2204 return dlm;
2205}
2206EXPORT_SYMBOL_GPL(dlm_register_domain);
2207
2208static LIST_HEAD(dlm_join_handlers);
2209
2210static void dlm_unregister_net_handlers(void)
2211{
2212 o2net_unregister_handler_list(&dlm_join_handlers);
2213}
2214
2215static int dlm_register_net_handlers(void)
2216{
2217 int status = 0;
2218
2219 status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
2220 sizeof(struct dlm_query_join_request),
2221 dlm_query_join_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08002222 NULL, NULL, &dlm_join_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002223 if (status)
2224 goto bail;
2225
2226 status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
2227 sizeof(struct dlm_assert_joined),
2228 dlm_assert_joined_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08002229 NULL, NULL, &dlm_join_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002230 if (status)
2231 goto bail;
2232
2233 status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
2234 sizeof(struct dlm_cancel_join),
2235 dlm_cancel_join_handler,
Kurt Hackeld74c9802007-01-17 17:04:25 -08002236 NULL, NULL, &dlm_join_handlers);
Sunil Mushranea203442010-10-09 10:26:23 -07002237 if (status)
2238 goto bail;
2239
2240 status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY,
2241 sizeof(struct dlm_query_region),
2242 dlm_query_region_handler,
2243 NULL, NULL, &dlm_join_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002244
Sunil Mushran18cfdf12010-10-07 16:47:03 -07002245 if (status)
2246 goto bail;
2247
2248 status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
2249 sizeof(struct dlm_query_nodeinfo),
2250 dlm_query_nodeinfo_handler,
2251 NULL, NULL, &dlm_join_handlers);
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002252bail:
2253 if (status < 0)
2254 dlm_unregister_net_handlers();
2255
2256 return status;
2257}
2258
2259/* Domain eviction callback handling.
2260 *
2261 * The file system requires notification of node death *before* the
2262 * dlm completes it's recovery work, otherwise it may be able to
2263 * acquire locks on resources requiring recovery. Since the dlm can
2264 * evict a node from it's domain *before* heartbeat fires, a similar
2265 * mechanism is required. */
2266
2267/* Eviction is not expected to happen often, so a per-domain lock is
2268 * not necessary. Eviction callbacks are allowed to sleep for short
2269 * periods of time. */
2270static DECLARE_RWSEM(dlm_callback_sem);
2271
2272void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm,
2273 int node_num)
2274{
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002275 struct dlm_eviction_cb *cb;
2276
2277 down_read(&dlm_callback_sem);
Dong Fangdf53cd32013-09-11 14:19:50 -07002278 list_for_each_entry(cb, &dlm->dlm_eviction_callbacks, ec_item) {
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002279 cb->ec_func(node_num, cb->ec_data);
2280 }
2281 up_read(&dlm_callback_sem);
2282}
2283
2284void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
2285 dlm_eviction_func *f,
2286 void *data)
2287{
2288 INIT_LIST_HEAD(&cb->ec_item);
2289 cb->ec_func = f;
2290 cb->ec_data = data;
2291}
2292EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb);
2293
2294void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
2295 struct dlm_eviction_cb *cb)
2296{
2297 down_write(&dlm_callback_sem);
2298 list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks);
2299 up_write(&dlm_callback_sem);
2300}
2301EXPORT_SYMBOL_GPL(dlm_register_eviction_cb);
2302
2303void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb)
2304{
2305 down_write(&dlm_callback_sem);
2306 list_del_init(&cb->ec_item);
2307 up_write(&dlm_callback_sem);
2308}
2309EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb);
2310
2311static int __init dlm_init(void)
2312{
2313 int status;
2314
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002315 status = dlm_init_mle_cache();
Sunil Mushran12eb0032008-03-10 15:16:19 -07002316 if (status) {
2317 mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n");
Sunil Mushran724bdca2008-03-10 15:16:20 -07002318 goto error;
2319 }
2320
2321 status = dlm_init_master_caches();
2322 if (status) {
2323 mlog(ML_ERROR, "Could not create o2dlm_lockres and "
2324 "o2dlm_lockname slabcaches\n");
2325 goto error;
2326 }
2327
2328 status = dlm_init_lock_cache();
2329 if (status) {
2330 mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n");
2331 goto error;
Sunil Mushran12eb0032008-03-10 15:16:19 -07002332 }
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002333
2334 status = dlm_register_net_handlers();
2335 if (status) {
Sunil Mushran724bdca2008-03-10 15:16:20 -07002336 mlog(ML_ERROR, "Unable to register network handlers\n");
2337 goto error;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002338 }
2339
Greg Kroah-Hartmane5815952019-07-11 20:53:12 -07002340 dlm_create_debugfs_root();
Sunil Mushran6325b4a2008-03-10 15:16:22 -07002341
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002342 return 0;
Sunil Mushran724bdca2008-03-10 15:16:20 -07002343error:
Sunil Mushran6325b4a2008-03-10 15:16:22 -07002344 dlm_unregister_net_handlers();
Sunil Mushran724bdca2008-03-10 15:16:20 -07002345 dlm_destroy_lock_cache();
2346 dlm_destroy_master_caches();
2347 dlm_destroy_mle_cache();
2348 return -1;
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002349}
2350
2351static void __exit dlm_exit (void)
2352{
Sunil Mushran6325b4a2008-03-10 15:16:22 -07002353 dlm_destroy_debugfs_root();
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002354 dlm_unregister_net_handlers();
Sunil Mushran724bdca2008-03-10 15:16:20 -07002355 dlm_destroy_lock_cache();
2356 dlm_destroy_master_caches();
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002357 dlm_destroy_mle_cache();
2358}
2359
2360MODULE_AUTHOR("Oracle");
2361MODULE_LICENSE("GPL");
Goldwyn Rodriguesff8fb332014-01-21 15:48:20 -08002362MODULE_DESCRIPTION("OCFS2 Distributed Lock Management");
Kurt Hackel6714d8e2005-12-15 14:31:23 -08002363
2364module_init(dlm_init);
2365module_exit(dlm_exit);