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6714d8e8 KH |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * dlmdomain.c | |
5 | * | |
6 | * defines domain join / leave apis | |
7 | * | |
8 | * Copyright (C) 2004 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | * | |
25 | */ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/highmem.h> | |
6714d8e8 KH |
31 | #include <linux/init.h> |
32 | #include <linux/spinlock.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/err.h> | |
6325b4a2 | 35 | #include <linux/debugfs.h> |
174cd4b1 | 36 | #include <linux/sched/signal.h> |
6714d8e8 KH |
37 | |
38 | #include "cluster/heartbeat.h" | |
39 | #include "cluster/nodemanager.h" | |
40 | #include "cluster/tcp.h" | |
41 | ||
42 | #include "dlmapi.h" | |
43 | #include "dlmcommon.h" | |
6714d8e8 | 44 | #include "dlmdomain.h" |
6325b4a2 | 45 | #include "dlmdebug.h" |
6714d8e8 | 46 | |
6714d8e8 KH |
47 | #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN) |
48 | #include "cluster/masklog.h" | |
49 | ||
1faf2894 SE |
50 | /* |
51 | * ocfs2 node maps are array of long int, which limits to send them freely | |
52 | * across the wire due to endianness issues. To workaround this, we convert | |
53 | * long ints to byte arrays. Following 3 routines are helper functions to | |
54 | * set/test/copy bits within those array of bytes | |
55 | */ | |
56 | static inline void byte_set_bit(u8 nr, u8 map[]) | |
57 | { | |
58 | map[nr >> 3] |= (1UL << (nr & 7)); | |
59 | } | |
60 | ||
61 | static inline int byte_test_bit(u8 nr, u8 map[]) | |
62 | { | |
63 | return ((1UL << (nr & 7)) & (map[nr >> 3])) != 0; | |
64 | } | |
65 | ||
66 | static inline void byte_copymap(u8 dmap[], unsigned long smap[], | |
67 | unsigned int sz) | |
68 | { | |
69 | unsigned int nn; | |
70 | ||
71 | if (!sz) | |
72 | return; | |
73 | ||
74 | memset(dmap, 0, ((sz + 7) >> 3)); | |
75 | for (nn = 0 ; nn < sz; nn++) | |
76 | if (test_bit(nn, smap)) | |
77 | byte_set_bit(nn, dmap); | |
78 | } | |
79 | ||
03d864c0 DP |
80 | static void dlm_free_pagevec(void **vec, int pages) |
81 | { | |
82 | while (pages--) | |
83 | free_page((unsigned long)vec[pages]); | |
84 | kfree(vec); | |
85 | } | |
86 | ||
87 | static void **dlm_alloc_pagevec(int pages) | |
88 | { | |
6da2ec56 | 89 | void **vec = kmalloc_array(pages, sizeof(void *), GFP_KERNEL); |
03d864c0 DP |
90 | int i; |
91 | ||
92 | if (!vec) | |
93 | return NULL; | |
94 | ||
95 | for (i = 0; i < pages; i++) | |
96 | if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL))) | |
97 | goto out_free; | |
c8f33b6e | 98 | |
685f1adb | 99 | mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n", |
f5a923d1 MF |
100 | pages, (unsigned long)DLM_HASH_PAGES, |
101 | (unsigned long)DLM_BUCKETS_PER_PAGE); | |
03d864c0 DP |
102 | return vec; |
103 | out_free: | |
104 | dlm_free_pagevec(vec, i); | |
105 | return NULL; | |
106 | } | |
107 | ||
6714d8e8 KH |
108 | /* |
109 | * | |
110 | * spinlock lock ordering: if multiple locks are needed, obey this ordering: | |
111 | * dlm_domain_lock | |
112 | * struct dlm_ctxt->spinlock | |
113 | * struct dlm_lock_resource->spinlock | |
114 | * struct dlm_ctxt->master_lock | |
115 | * struct dlm_ctxt->ast_lock | |
116 | * dlm_master_list_entry->spinlock | |
117 | * dlm_lock->spinlock | |
118 | * | |
119 | */ | |
120 | ||
34af946a | 121 | DEFINE_SPINLOCK(dlm_domain_lock); |
6714d8e8 KH |
122 | LIST_HEAD(dlm_domains); |
123 | static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events); | |
124 | ||
d24fbcda JB |
125 | /* |
126 | * The supported protocol version for DLM communication. Running domains | |
127 | * will have a negotiated version with the same major number and a minor | |
128 | * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should | |
129 | * be used to determine what a running domain is actually using. | |
ea203441 SM |
130 | * |
131 | * New in version 1.1: | |
132 | * - Message DLM_QUERY_REGION added to support global heartbeat | |
18cfdf1b | 133 | * - Message DLM_QUERY_NODEINFO added to allow online node removes |
bddefdee SM |
134 | * New in version 1.2: |
135 | * - Message DLM_BEGIN_EXIT_DOMAIN_MSG added to mark start of exit domain | |
60d663cb | 136 | * New in version 1.3: |
137 | * - Message DLM_DEREF_LOCKRES_DONE added to inform non-master that the | |
138 | * refmap is cleared | |
d24fbcda JB |
139 | */ |
140 | static const struct dlm_protocol_version dlm_protocol = { | |
141 | .pv_major = 1, | |
60d663cb | 142 | .pv_minor = 3, |
d24fbcda JB |
143 | }; |
144 | ||
6714d8e8 KH |
145 | #define DLM_DOMAIN_BACKOFF_MS 200 |
146 | ||
d74c9803 KH |
147 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
148 | void **ret_data); | |
149 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, | |
150 | void **ret_data); | |
151 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, | |
152 | void **ret_data); | |
ea203441 SM |
153 | static int dlm_query_region_handler(struct o2net_msg *msg, u32 len, |
154 | void *data, void **ret_data); | |
d74c9803 KH |
155 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
156 | void **ret_data); | |
d24fbcda JB |
157 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, |
158 | struct dlm_protocol_version *request); | |
6714d8e8 KH |
159 | |
160 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm); | |
161 | ||
e9f0b6a6 | 162 | void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) |
6714d8e8 | 163 | { |
e9f0b6a6 SM |
164 | if (hlist_unhashed(&res->hash_node)) |
165 | return; | |
166 | ||
167 | mlog(0, "%s: Unhash res %.*s\n", dlm->name, res->lockname.len, | |
168 | res->lockname.name); | |
169 | hlist_del_init(&res->hash_node); | |
170 | dlm_lockres_put(res); | |
6714d8e8 KH |
171 | } |
172 | ||
e9f0b6a6 | 173 | void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) |
6714d8e8 | 174 | { |
81f2094a | 175 | struct hlist_head *bucket; |
6714d8e8 KH |
176 | |
177 | assert_spin_locked(&dlm->spinlock); | |
178 | ||
612645f7 | 179 | bucket = dlm_lockres_hash(dlm, res->lockname.hash); |
6714d8e8 KH |
180 | |
181 | /* get a reference for our hashtable */ | |
182 | dlm_lockres_get(res); | |
183 | ||
81f2094a | 184 | hlist_add_head(&res->hash_node, bucket); |
e9f0b6a6 SM |
185 | |
186 | mlog(0, "%s: Hash res %.*s\n", dlm->name, res->lockname.len, | |
187 | res->lockname.name); | |
6714d8e8 KH |
188 | } |
189 | ||
ba2bf218 KH |
190 | struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm, |
191 | const char *name, | |
192 | unsigned int len, | |
193 | unsigned int hash) | |
6714d8e8 | 194 | { |
81f2094a | 195 | struct hlist_head *bucket; |
df53cd3b | 196 | struct dlm_lock_resource *res; |
6714d8e8 | 197 | |
ef6b689b | 198 | mlog(0, "%.*s\n", len, name); |
6714d8e8 KH |
199 | |
200 | assert_spin_locked(&dlm->spinlock); | |
201 | ||
03d864c0 DP |
202 | bucket = dlm_lockres_hash(dlm, hash); |
203 | ||
df53cd3b | 204 | hlist_for_each_entry(res, bucket, hash_node) { |
4198985f DP |
205 | if (res->lockname.name[0] != name[0]) |
206 | continue; | |
207 | if (unlikely(res->lockname.len != len)) | |
208 | continue; | |
209 | if (memcmp(res->lockname.name + 1, name + 1, len - 1)) | |
210 | continue; | |
211 | dlm_lockres_get(res); | |
212 | return res; | |
6714d8e8 | 213 | } |
4198985f | 214 | return NULL; |
6714d8e8 KH |
215 | } |
216 | ||
ba2bf218 KH |
217 | /* intended to be called by functions which do not care about lock |
218 | * resources which are being purged (most net _handler functions). | |
219 | * this will return NULL for any lock resource which is found but | |
220 | * currently in the process of dropping its mastery reference. | |
221 | * use __dlm_lookup_lockres_full when you need the lock resource | |
222 | * regardless (e.g. dlm_get_lock_resource) */ | |
223 | struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, | |
224 | const char *name, | |
225 | unsigned int len, | |
226 | unsigned int hash) | |
227 | { | |
228 | struct dlm_lock_resource *res = NULL; | |
229 | ||
ef6b689b | 230 | mlog(0, "%.*s\n", len, name); |
ba2bf218 KH |
231 | |
232 | assert_spin_locked(&dlm->spinlock); | |
233 | ||
234 | res = __dlm_lookup_lockres_full(dlm, name, len, hash); | |
235 | if (res) { | |
236 | spin_lock(&res->spinlock); | |
237 | if (res->state & DLM_LOCK_RES_DROPPING_REF) { | |
238 | spin_unlock(&res->spinlock); | |
239 | dlm_lockres_put(res); | |
240 | return NULL; | |
241 | } | |
242 | spin_unlock(&res->spinlock); | |
243 | } | |
244 | ||
245 | return res; | |
246 | } | |
247 | ||
6714d8e8 KH |
248 | struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, |
249 | const char *name, | |
250 | unsigned int len) | |
251 | { | |
252 | struct dlm_lock_resource *res; | |
a3d33291 | 253 | unsigned int hash = dlm_lockid_hash(name, len); |
6714d8e8 KH |
254 | |
255 | spin_lock(&dlm->spinlock); | |
a3d33291 | 256 | res = __dlm_lookup_lockres(dlm, name, len, hash); |
6714d8e8 KH |
257 | spin_unlock(&dlm->spinlock); |
258 | return res; | |
259 | } | |
260 | ||
261 | static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len) | |
262 | { | |
df53cd3b | 263 | struct dlm_ctxt *tmp; |
6714d8e8 KH |
264 | |
265 | assert_spin_locked(&dlm_domain_lock); | |
266 | ||
267 | /* tmp->name here is always NULL terminated, | |
268 | * but domain may not be! */ | |
df53cd3b | 269 | list_for_each_entry(tmp, &dlm_domains, list) { |
6714d8e8 KH |
270 | if (strlen(tmp->name) == len && |
271 | memcmp(tmp->name, domain, len)==0) | |
df53cd3b | 272 | return tmp; |
6714d8e8 KH |
273 | } |
274 | ||
df53cd3b | 275 | return NULL; |
6714d8e8 KH |
276 | } |
277 | ||
278 | /* For null terminated domain strings ONLY */ | |
279 | static struct dlm_ctxt * __dlm_lookup_domain(const char *domain) | |
280 | { | |
281 | assert_spin_locked(&dlm_domain_lock); | |
282 | ||
283 | return __dlm_lookup_domain_full(domain, strlen(domain)); | |
284 | } | |
285 | ||
286 | ||
287 | /* returns true on one of two conditions: | |
288 | * 1) the domain does not exist | |
289 | * 2) the domain exists and it's state is "joined" */ | |
290 | static int dlm_wait_on_domain_helper(const char *domain) | |
291 | { | |
292 | int ret = 0; | |
293 | struct dlm_ctxt *tmp = NULL; | |
294 | ||
295 | spin_lock(&dlm_domain_lock); | |
296 | ||
297 | tmp = __dlm_lookup_domain(domain); | |
298 | if (!tmp) | |
299 | ret = 1; | |
300 | else if (tmp->dlm_state == DLM_CTXT_JOINED) | |
301 | ret = 1; | |
302 | ||
303 | spin_unlock(&dlm_domain_lock); | |
304 | return ret; | |
305 | } | |
306 | ||
307 | static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm) | |
308 | { | |
6325b4a2 SM |
309 | dlm_destroy_debugfs_subroot(dlm); |
310 | ||
81f2094a | 311 | if (dlm->lockres_hash) |
03d864c0 | 312 | dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES); |
6714d8e8 | 313 | |
e2b66ddc SM |
314 | if (dlm->master_hash) |
315 | dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES); | |
316 | ||
d787ab09 | 317 | kfree(dlm->name); |
6714d8e8 KH |
318 | kfree(dlm); |
319 | } | |
320 | ||
321 | /* A little strange - this function will be called while holding | |
322 | * dlm_domain_lock and is expected to be holding it on the way out. We | |
323 | * will however drop and reacquire it multiple times */ | |
324 | static void dlm_ctxt_release(struct kref *kref) | |
325 | { | |
326 | struct dlm_ctxt *dlm; | |
327 | ||
328 | dlm = container_of(kref, struct dlm_ctxt, dlm_refs); | |
329 | ||
330 | BUG_ON(dlm->num_joins); | |
331 | BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED); | |
332 | ||
333 | /* we may still be in the list if we hit an error during join. */ | |
334 | list_del_init(&dlm->list); | |
335 | ||
336 | spin_unlock(&dlm_domain_lock); | |
337 | ||
338 | mlog(0, "freeing memory from domain %s\n", dlm->name); | |
339 | ||
340 | wake_up(&dlm_domain_events); | |
341 | ||
342 | dlm_free_ctxt_mem(dlm); | |
343 | ||
344 | spin_lock(&dlm_domain_lock); | |
345 | } | |
346 | ||
347 | void dlm_put(struct dlm_ctxt *dlm) | |
348 | { | |
349 | spin_lock(&dlm_domain_lock); | |
350 | kref_put(&dlm->dlm_refs, dlm_ctxt_release); | |
351 | spin_unlock(&dlm_domain_lock); | |
352 | } | |
353 | ||
354 | static void __dlm_get(struct dlm_ctxt *dlm) | |
355 | { | |
356 | kref_get(&dlm->dlm_refs); | |
357 | } | |
358 | ||
359 | /* given a questionable reference to a dlm object, gets a reference if | |
360 | * it can find it in the list, otherwise returns NULL in which case | |
361 | * you shouldn't trust your pointer. */ | |
362 | struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm) | |
363 | { | |
df53cd3b DF |
364 | struct dlm_ctxt *target; |
365 | struct dlm_ctxt *ret = NULL; | |
6714d8e8 KH |
366 | |
367 | spin_lock(&dlm_domain_lock); | |
368 | ||
df53cd3b | 369 | list_for_each_entry(target, &dlm_domains, list) { |
6714d8e8 KH |
370 | if (target == dlm) { |
371 | __dlm_get(target); | |
df53cd3b | 372 | ret = target; |
6714d8e8 KH |
373 | break; |
374 | } | |
6714d8e8 KH |
375 | } |
376 | ||
377 | spin_unlock(&dlm_domain_lock); | |
378 | ||
df53cd3b | 379 | return ret; |
6714d8e8 KH |
380 | } |
381 | ||
382 | int dlm_domain_fully_joined(struct dlm_ctxt *dlm) | |
383 | { | |
384 | int ret; | |
385 | ||
386 | spin_lock(&dlm_domain_lock); | |
387 | ret = (dlm->dlm_state == DLM_CTXT_JOINED) || | |
388 | (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN); | |
389 | spin_unlock(&dlm_domain_lock); | |
390 | ||
391 | return ret; | |
392 | } | |
393 | ||
3156d267 KH |
394 | static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm) |
395 | { | |
396 | if (dlm->dlm_worker) { | |
3156d267 KH |
397 | destroy_workqueue(dlm->dlm_worker); |
398 | dlm->dlm_worker = NULL; | |
399 | } | |
400 | } | |
401 | ||
6714d8e8 KH |
402 | static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm) |
403 | { | |
404 | dlm_unregister_domain_handlers(dlm); | |
007dce53 | 405 | dlm_debug_shutdown(dlm); |
6714d8e8 KH |
406 | dlm_complete_thread(dlm); |
407 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 408 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
409 | |
410 | /* We've left the domain. Now we can take ourselves out of the | |
411 | * list and allow the kref stuff to help us free the | |
412 | * memory. */ | |
413 | spin_lock(&dlm_domain_lock); | |
414 | list_del_init(&dlm->list); | |
415 | spin_unlock(&dlm_domain_lock); | |
416 | ||
417 | /* Wake up anyone waiting for us to remove this domain */ | |
418 | wake_up(&dlm_domain_events); | |
419 | } | |
420 | ||
ba2bf218 | 421 | static int dlm_migrate_all_locks(struct dlm_ctxt *dlm) |
6714d8e8 | 422 | { |
ba2bf218 | 423 | int i, num, n, ret = 0; |
6714d8e8 | 424 | struct dlm_lock_resource *res; |
ba2bf218 KH |
425 | struct hlist_node *iter; |
426 | struct hlist_head *bucket; | |
427 | int dropped; | |
6714d8e8 KH |
428 | |
429 | mlog(0, "Migrating locks from domain %s\n", dlm->name); | |
ba2bf218 KH |
430 | |
431 | num = 0; | |
6714d8e8 | 432 | spin_lock(&dlm->spinlock); |
81f2094a | 433 | for (i = 0; i < DLM_HASH_BUCKETS; i++) { |
ba2bf218 KH |
434 | redo_bucket: |
435 | n = 0; | |
436 | bucket = dlm_lockres_hash(dlm, i); | |
437 | iter = bucket->first; | |
438 | while (iter) { | |
439 | n++; | |
440 | res = hlist_entry(iter, struct dlm_lock_resource, | |
441 | hash_node); | |
6714d8e8 | 442 | dlm_lockres_get(res); |
ba2bf218 KH |
443 | /* migrate, if necessary. this will drop the dlm |
444 | * spinlock and retake it if it does migration. */ | |
445 | dropped = dlm_empty_lockres(dlm, res); | |
446 | ||
447 | spin_lock(&res->spinlock); | |
66effd3c SM |
448 | if (dropped) |
449 | __dlm_lockres_calc_usage(dlm, res); | |
450 | else | |
451 | iter = res->hash_node.next; | |
ba2bf218 KH |
452 | spin_unlock(&res->spinlock); |
453 | ||
6714d8e8 | 454 | dlm_lockres_put(res); |
ba2bf218 | 455 | |
66effd3c SM |
456 | if (dropped) { |
457 | cond_resched_lock(&dlm->spinlock); | |
ba2bf218 | 458 | goto redo_bucket; |
66effd3c | 459 | } |
6714d8e8 | 460 | } |
0d01af6e | 461 | cond_resched_lock(&dlm->spinlock); |
ba2bf218 | 462 | num += n; |
6714d8e8 | 463 | } |
60c7ec9e | 464 | |
465 | if (!num) { | |
466 | if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) { | |
467 | mlog(0, "%s: perhaps there are more lock resources " | |
468 | "need to be migrated after dlm recovery\n", dlm->name); | |
469 | ret = -EAGAIN; | |
470 | } else { | |
471 | mlog(0, "%s: we won't do dlm recovery after migrating " | |
472 | "all lock resources\n", dlm->name); | |
473 | dlm->migrate_done = 1; | |
474 | } | |
475 | } | |
476 | ||
6714d8e8 | 477 | spin_unlock(&dlm->spinlock); |
ba2bf218 KH |
478 | wake_up(&dlm->dlm_thread_wq); |
479 | ||
480 | /* let the dlm thread take care of purging, keep scanning until | |
481 | * nothing remains in the hash */ | |
482 | if (num) { | |
483 | mlog(0, "%s: %d lock resources in hash last pass\n", | |
484 | dlm->name, num); | |
485 | ret = -EAGAIN; | |
486 | } | |
6714d8e8 | 487 | mlog(0, "DONE Migrating locks from domain %s\n", dlm->name); |
ba2bf218 | 488 | return ret; |
6714d8e8 KH |
489 | } |
490 | ||
491 | static int dlm_no_joining_node(struct dlm_ctxt *dlm) | |
492 | { | |
493 | int ret; | |
494 | ||
495 | spin_lock(&dlm->spinlock); | |
496 | ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN; | |
497 | spin_unlock(&dlm->spinlock); | |
498 | ||
499 | return ret; | |
500 | } | |
501 | ||
bddefdee SM |
502 | static int dlm_begin_exit_domain_handler(struct o2net_msg *msg, u32 len, |
503 | void *data, void **ret_data) | |
504 | { | |
505 | struct dlm_ctxt *dlm = data; | |
506 | unsigned int node; | |
507 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; | |
508 | ||
509 | if (!dlm_grab(dlm)) | |
510 | return 0; | |
511 | ||
512 | node = exit_msg->node_idx; | |
513 | mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm->name, node); | |
514 | ||
515 | spin_lock(&dlm->spinlock); | |
516 | set_bit(node, dlm->exit_domain_map); | |
517 | spin_unlock(&dlm->spinlock); | |
518 | ||
519 | dlm_put(dlm); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
6714d8e8 KH |
524 | static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm) |
525 | { | |
526 | /* Yikes, a double spinlock! I need domain_lock for the dlm | |
527 | * state and the dlm spinlock for join state... Sorry! */ | |
528 | again: | |
529 | spin_lock(&dlm_domain_lock); | |
530 | spin_lock(&dlm->spinlock); | |
531 | ||
532 | if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { | |
533 | mlog(0, "Node %d is joining, we wait on it.\n", | |
534 | dlm->joining_node); | |
535 | spin_unlock(&dlm->spinlock); | |
536 | spin_unlock(&dlm_domain_lock); | |
537 | ||
538 | wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm)); | |
539 | goto again; | |
540 | } | |
541 | ||
542 | dlm->dlm_state = DLM_CTXT_LEAVING; | |
543 | spin_unlock(&dlm->spinlock); | |
544 | spin_unlock(&dlm_domain_lock); | |
545 | } | |
546 | ||
547 | static void __dlm_print_nodes(struct dlm_ctxt *dlm) | |
548 | { | |
8decab3c | 549 | int node = -1, num = 0; |
6714d8e8 KH |
550 | |
551 | assert_spin_locked(&dlm->spinlock); | |
552 | ||
8decab3c | 553 | printk("( "); |
6714d8e8 KH |
554 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, |
555 | node + 1)) < O2NM_MAX_NODES) { | |
781ee3e2 | 556 | printk("%d ", node); |
8decab3c | 557 | ++num; |
6714d8e8 | 558 | } |
8decab3c | 559 | printk(") %u nodes\n", num); |
6714d8e8 KH |
560 | } |
561 | ||
d74c9803 KH |
562 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
563 | void **ret_data) | |
6714d8e8 KH |
564 | { |
565 | struct dlm_ctxt *dlm = data; | |
566 | unsigned int node; | |
567 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; | |
568 | ||
ef6b689b | 569 | mlog(0, "%p %u %p", msg, len, data); |
6714d8e8 KH |
570 | |
571 | if (!dlm_grab(dlm)) | |
572 | return 0; | |
573 | ||
574 | node = exit_msg->node_idx; | |
575 | ||
6714d8e8 KH |
576 | spin_lock(&dlm->spinlock); |
577 | clear_bit(node, dlm->domain_map); | |
bddefdee | 578 | clear_bit(node, dlm->exit_domain_map); |
8decab3c | 579 | printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s ", node, dlm->name); |
6714d8e8 KH |
580 | __dlm_print_nodes(dlm); |
581 | ||
582 | /* notify anything attached to the heartbeat events */ | |
583 | dlm_hb_event_notify_attached(dlm, node, 0); | |
584 | ||
585 | spin_unlock(&dlm->spinlock); | |
586 | ||
587 | dlm_put(dlm); | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
bddefdee | 592 | static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, u32 msg_type, |
6714d8e8 KH |
593 | unsigned int node) |
594 | { | |
595 | int status; | |
596 | struct dlm_exit_domain leave_msg; | |
597 | ||
bddefdee SM |
598 | mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm->name, |
599 | msg_type, node); | |
6714d8e8 KH |
600 | |
601 | memset(&leave_msg, 0, sizeof(leave_msg)); | |
602 | leave_msg.node_idx = dlm->node_num; | |
603 | ||
bddefdee SM |
604 | status = o2net_send_message(msg_type, dlm->key, &leave_msg, |
605 | sizeof(leave_msg), node, NULL); | |
a5196ec5 | 606 | if (status < 0) |
bddefdee SM |
607 | mlog(ML_ERROR, "Error %d sending domain exit message %u " |
608 | "to node %u on domain %s\n", status, msg_type, node, | |
609 | dlm->name); | |
6714d8e8 KH |
610 | |
611 | return status; | |
612 | } | |
613 | ||
bddefdee SM |
614 | static void dlm_begin_exit_domain(struct dlm_ctxt *dlm) |
615 | { | |
616 | int node = -1; | |
617 | ||
618 | /* Support for begin exit domain was added in 1.2 */ | |
619 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
620 | dlm->dlm_locking_proto.pv_minor < 2) | |
621 | return; | |
622 | ||
623 | /* | |
624 | * Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely | |
625 | * informational. Meaning if a node does not receive the message, | |
626 | * so be it. | |
627 | */ | |
628 | spin_lock(&dlm->spinlock); | |
629 | while (1) { | |
630 | node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, node + 1); | |
631 | if (node >= O2NM_MAX_NODES) | |
632 | break; | |
633 | if (node == dlm->node_num) | |
634 | continue; | |
635 | ||
636 | spin_unlock(&dlm->spinlock); | |
637 | dlm_send_one_domain_exit(dlm, DLM_BEGIN_EXIT_DOMAIN_MSG, node); | |
638 | spin_lock(&dlm->spinlock); | |
639 | } | |
640 | spin_unlock(&dlm->spinlock); | |
641 | } | |
6714d8e8 KH |
642 | |
643 | static void dlm_leave_domain(struct dlm_ctxt *dlm) | |
644 | { | |
645 | int node, clear_node, status; | |
646 | ||
647 | /* At this point we've migrated away all our locks and won't | |
648 | * accept mastership of new ones. The dlm is responsible for | |
649 | * almost nothing now. We make sure not to confuse any joining | |
650 | * nodes and then commence shutdown procedure. */ | |
651 | ||
652 | spin_lock(&dlm->spinlock); | |
653 | /* Clear ourselves from the domain map */ | |
654 | clear_bit(dlm->node_num, dlm->domain_map); | |
655 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, | |
656 | 0)) < O2NM_MAX_NODES) { | |
657 | /* Drop the dlm spinlock. This is safe wrt the domain_map. | |
658 | * -nodes cannot be added now as the | |
659 | * query_join_handlers knows to respond with OK_NO_MAP | |
660 | * -we catch the right network errors if a node is | |
661 | * removed from the map while we're sending him the | |
662 | * exit message. */ | |
663 | spin_unlock(&dlm->spinlock); | |
664 | ||
665 | clear_node = 1; | |
666 | ||
bddefdee SM |
667 | status = dlm_send_one_domain_exit(dlm, DLM_EXIT_DOMAIN_MSG, |
668 | node); | |
6714d8e8 KH |
669 | if (status < 0 && |
670 | status != -ENOPROTOOPT && | |
671 | status != -ENOTCONN) { | |
672 | mlog(ML_NOTICE, "Error %d sending domain exit message " | |
673 | "to node %d\n", status, node); | |
674 | ||
675 | /* Not sure what to do here but lets sleep for | |
676 | * a bit in case this was a transient | |
677 | * error... */ | |
678 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
679 | clear_node = 0; | |
680 | } | |
681 | ||
682 | spin_lock(&dlm->spinlock); | |
683 | /* If we're not clearing the node bit then we intend | |
684 | * to loop back around to try again. */ | |
685 | if (clear_node) | |
686 | clear_bit(node, dlm->domain_map); | |
687 | } | |
688 | spin_unlock(&dlm->spinlock); | |
689 | } | |
690 | ||
6714d8e8 KH |
691 | void dlm_unregister_domain(struct dlm_ctxt *dlm) |
692 | { | |
693 | int leave = 0; | |
29576f8b | 694 | struct dlm_lock_resource *res; |
6714d8e8 KH |
695 | |
696 | spin_lock(&dlm_domain_lock); | |
697 | BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED); | |
698 | BUG_ON(!dlm->num_joins); | |
699 | ||
700 | dlm->num_joins--; | |
701 | if (!dlm->num_joins) { | |
702 | /* We mark it "in shutdown" now so new register | |
703 | * requests wait until we've completely left the | |
704 | * domain. Don't use DLM_CTXT_LEAVING yet as we still | |
705 | * want new domain joins to communicate with us at | |
706 | * least until we've completed migration of our | |
707 | * resources. */ | |
708 | dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN; | |
709 | leave = 1; | |
710 | } | |
711 | spin_unlock(&dlm_domain_lock); | |
712 | ||
713 | if (leave) { | |
714 | mlog(0, "shutting down domain %s\n", dlm->name); | |
bddefdee | 715 | dlm_begin_exit_domain(dlm); |
6714d8e8 KH |
716 | |
717 | /* We changed dlm state, notify the thread */ | |
718 | dlm_kick_thread(dlm, NULL); | |
719 | ||
ba2bf218 | 720 | while (dlm_migrate_all_locks(dlm)) { |
2f5bf1f2 SM |
721 | /* Give dlm_thread time to purge the lockres' */ |
722 | msleep(500); | |
ba2bf218 KH |
723 | mlog(0, "%s: more migration to do\n", dlm->name); |
724 | } | |
29576f8b SM |
725 | |
726 | /* This list should be empty. If not, print remaining lockres */ | |
727 | if (!list_empty(&dlm->tracking_list)) { | |
728 | mlog(ML_ERROR, "Following lockres' are still on the " | |
729 | "tracking list:\n"); | |
730 | list_for_each_entry(res, &dlm->tracking_list, tracking) | |
731 | dlm_print_one_lock_resource(res); | |
732 | } | |
733 | ||
6714d8e8 KH |
734 | dlm_mark_domain_leaving(dlm); |
735 | dlm_leave_domain(dlm); | |
8decab3c | 736 | printk(KERN_NOTICE "o2dlm: Leaving domain %s\n", dlm->name); |
5dad6c39 | 737 | dlm_force_free_mles(dlm); |
6714d8e8 KH |
738 | dlm_complete_dlm_shutdown(dlm); |
739 | } | |
740 | dlm_put(dlm); | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(dlm_unregister_domain); | |
743 | ||
d24fbcda JB |
744 | static int dlm_query_join_proto_check(char *proto_type, int node, |
745 | struct dlm_protocol_version *ours, | |
746 | struct dlm_protocol_version *request) | |
747 | { | |
748 | int rc; | |
749 | struct dlm_protocol_version proto = *request; | |
750 | ||
751 | if (!dlm_protocol_compare(ours, &proto)) { | |
752 | mlog(0, | |
753 | "node %u wanted to join with %s locking protocol " | |
754 | "%u.%u, we respond with %u.%u\n", | |
755 | node, proto_type, | |
756 | request->pv_major, | |
757 | request->pv_minor, | |
758 | proto.pv_major, proto.pv_minor); | |
759 | request->pv_minor = proto.pv_minor; | |
760 | rc = 0; | |
761 | } else { | |
762 | mlog(ML_NOTICE, | |
763 | "Node %u wanted to join with %s locking " | |
764 | "protocol %u.%u, but we have %u.%u, disallowing\n", | |
765 | node, proto_type, | |
766 | request->pv_major, | |
767 | request->pv_minor, | |
768 | ours->pv_major, | |
769 | ours->pv_minor); | |
770 | rc = 1; | |
771 | } | |
772 | ||
773 | return rc; | |
774 | } | |
775 | ||
0f71b7b4 JB |
776 | /* |
777 | * struct dlm_query_join_packet is made up of four one-byte fields. They | |
778 | * are effectively in big-endian order already. However, little-endian | |
779 | * machines swap them before putting the packet on the wire (because | |
780 | * query_join's response is a status, and that status is treated as a u32 | |
781 | * on the wire). Thus, a big-endian and little-endian machines will treat | |
782 | * this structure differently. | |
783 | * | |
784 | * The solution is to have little-endian machines swap the structure when | |
785 | * converting from the structure to the u32 representation. This will | |
786 | * result in the structure having the correct format on the wire no matter | |
787 | * the host endian format. | |
788 | */ | |
789 | static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet, | |
790 | u32 *wire) | |
791 | { | |
792 | union dlm_query_join_response response; | |
793 | ||
794 | response.packet = *packet; | |
85158410 | 795 | *wire = be32_to_cpu(response.intval); |
0f71b7b4 JB |
796 | } |
797 | ||
798 | static void dlm_query_join_wire_to_packet(u32 wire, | |
799 | struct dlm_query_join_packet *packet) | |
800 | { | |
801 | union dlm_query_join_response response; | |
802 | ||
803 | response.intval = cpu_to_be32(wire); | |
804 | *packet = response.packet; | |
805 | } | |
806 | ||
d74c9803 KH |
807 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
808 | void **ret_data) | |
6714d8e8 KH |
809 | { |
810 | struct dlm_query_join_request *query; | |
0f71b7b4 JB |
811 | struct dlm_query_join_packet packet = { |
812 | .code = JOIN_DISALLOW, | |
d24fbcda | 813 | }; |
6714d8e8 | 814 | struct dlm_ctxt *dlm = NULL; |
0f71b7b4 | 815 | u32 response; |
1faf2894 | 816 | u8 nodenum; |
6714d8e8 KH |
817 | |
818 | query = (struct dlm_query_join_request *) msg->buf; | |
819 | ||
820 | mlog(0, "node %u wants to join domain %s\n", query->node_idx, | |
821 | query->domain); | |
822 | ||
823 | /* | |
824 | * If heartbeat doesn't consider the node live, tell it | |
825 | * to back off and try again. This gives heartbeat a chance | |
826 | * to catch up. | |
827 | */ | |
70e82a12 | 828 | if (!o2hb_check_node_heartbeating_no_sem(query->node_idx)) { |
6714d8e8 KH |
829 | mlog(0, "node %u is not in our live map yet\n", |
830 | query->node_idx); | |
831 | ||
0f71b7b4 | 832 | packet.code = JOIN_DISALLOW; |
6714d8e8 KH |
833 | goto respond; |
834 | } | |
835 | ||
0f71b7b4 | 836 | packet.code = JOIN_OK_NO_MAP; |
6714d8e8 KH |
837 | |
838 | spin_lock(&dlm_domain_lock); | |
839 | dlm = __dlm_lookup_domain_full(query->domain, query->name_len); | |
1faf2894 SE |
840 | if (!dlm) |
841 | goto unlock_respond; | |
842 | ||
843 | /* | |
844 | * There is a small window where the joining node may not see the | |
845 | * node(s) that just left but still part of the cluster. DISALLOW | |
846 | * join request if joining node has different node map. | |
847 | */ | |
848 | nodenum=0; | |
849 | while (nodenum < O2NM_MAX_NODES) { | |
850 | if (test_bit(nodenum, dlm->domain_map)) { | |
851 | if (!byte_test_bit(nodenum, query->node_map)) { | |
e4968476 SM |
852 | mlog(0, "disallow join as node %u does not " |
853 | "have node %u in its nodemap\n", | |
854 | query->node_idx, nodenum); | |
0f71b7b4 | 855 | packet.code = JOIN_DISALLOW; |
1faf2894 SE |
856 | goto unlock_respond; |
857 | } | |
858 | } | |
859 | nodenum++; | |
860 | } | |
861 | ||
6714d8e8 | 862 | /* Once the dlm ctxt is marked as leaving then we don't want |
2bd63216 | 863 | * to be put in someone's domain map. |
e2faea4c KH |
864 | * Also, explicitly disallow joining at certain troublesome |
865 | * times (ie. during recovery). */ | |
b3e3e5af | 866 | if (dlm->dlm_state != DLM_CTXT_LEAVING) { |
e2faea4c | 867 | int bit = query->node_idx; |
6714d8e8 KH |
868 | spin_lock(&dlm->spinlock); |
869 | ||
870 | if (dlm->dlm_state == DLM_CTXT_NEW && | |
871 | dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) { | |
872 | /*If this is a brand new context and we | |
873 | * haven't started our join process yet, then | |
874 | * the other node won the race. */ | |
0f71b7b4 | 875 | packet.code = JOIN_OK_NO_MAP; |
6714d8e8 KH |
876 | } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { |
877 | /* Disallow parallel joins. */ | |
0f71b7b4 | 878 | packet.code = JOIN_DISALLOW; |
e2faea4c | 879 | } else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) { |
e4968476 | 880 | mlog(0, "node %u trying to join, but recovery " |
e2faea4c | 881 | "is ongoing.\n", bit); |
0f71b7b4 | 882 | packet.code = JOIN_DISALLOW; |
e2faea4c | 883 | } else if (test_bit(bit, dlm->recovery_map)) { |
e4968476 | 884 | mlog(0, "node %u trying to join, but it " |
e2faea4c | 885 | "still needs recovery.\n", bit); |
0f71b7b4 | 886 | packet.code = JOIN_DISALLOW; |
e2faea4c | 887 | } else if (test_bit(bit, dlm->domain_map)) { |
e4968476 | 888 | mlog(0, "node %u trying to join, but it " |
e2faea4c KH |
889 | "is still in the domain! needs recovery?\n", |
890 | bit); | |
0f71b7b4 | 891 | packet.code = JOIN_DISALLOW; |
6714d8e8 KH |
892 | } else { |
893 | /* Alright we're fully a part of this domain | |
894 | * so we keep some state as to who's joining | |
895 | * and indicate to him that needs to be fixed | |
896 | * up. */ | |
d24fbcda JB |
897 | |
898 | /* Make sure we speak compatible locking protocols. */ | |
899 | if (dlm_query_join_proto_check("DLM", bit, | |
900 | &dlm->dlm_locking_proto, | |
901 | &query->dlm_proto)) { | |
0f71b7b4 | 902 | packet.code = JOIN_PROTOCOL_MISMATCH; |
d24fbcda JB |
903 | } else if (dlm_query_join_proto_check("fs", bit, |
904 | &dlm->fs_locking_proto, | |
905 | &query->fs_proto)) { | |
0f71b7b4 | 906 | packet.code = JOIN_PROTOCOL_MISMATCH; |
d24fbcda | 907 | } else { |
0f71b7b4 JB |
908 | packet.dlm_minor = query->dlm_proto.pv_minor; |
909 | packet.fs_minor = query->fs_proto.pv_minor; | |
910 | packet.code = JOIN_OK; | |
d24fbcda JB |
911 | __dlm_set_joining_node(dlm, query->node_idx); |
912 | } | |
6714d8e8 KH |
913 | } |
914 | ||
915 | spin_unlock(&dlm->spinlock); | |
916 | } | |
1faf2894 | 917 | unlock_respond: |
6714d8e8 KH |
918 | spin_unlock(&dlm_domain_lock); |
919 | ||
920 | respond: | |
0f71b7b4 | 921 | mlog(0, "We respond with %u\n", packet.code); |
6714d8e8 | 922 | |
0f71b7b4 JB |
923 | dlm_query_join_packet_to_wire(&packet, &response); |
924 | return response; | |
6714d8e8 KH |
925 | } |
926 | ||
d74c9803 KH |
927 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, |
928 | void **ret_data) | |
6714d8e8 KH |
929 | { |
930 | struct dlm_assert_joined *assert; | |
931 | struct dlm_ctxt *dlm = NULL; | |
932 | ||
933 | assert = (struct dlm_assert_joined *) msg->buf; | |
934 | ||
935 | mlog(0, "node %u asserts join on domain %s\n", assert->node_idx, | |
936 | assert->domain); | |
937 | ||
938 | spin_lock(&dlm_domain_lock); | |
939 | dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len); | |
940 | /* XXX should we consider no dlm ctxt an error? */ | |
941 | if (dlm) { | |
942 | spin_lock(&dlm->spinlock); | |
943 | ||
944 | /* Alright, this node has officially joined our | |
945 | * domain. Set him in the map and clean up our | |
946 | * leftover join state. */ | |
947 | BUG_ON(dlm->joining_node != assert->node_idx); | |
01c6222f X |
948 | |
949 | if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) { | |
950 | mlog(0, "dlm recovery is ongoing, disallow join\n"); | |
951 | spin_unlock(&dlm->spinlock); | |
952 | spin_unlock(&dlm_domain_lock); | |
953 | return -EAGAIN; | |
954 | } | |
955 | ||
6714d8e8 | 956 | set_bit(assert->node_idx, dlm->domain_map); |
bddefdee | 957 | clear_bit(assert->node_idx, dlm->exit_domain_map); |
6714d8e8 KH |
958 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); |
959 | ||
8decab3c | 960 | printk(KERN_NOTICE "o2dlm: Node %u joins domain %s ", |
781ee3e2 | 961 | assert->node_idx, dlm->name); |
6714d8e8 KH |
962 | __dlm_print_nodes(dlm); |
963 | ||
964 | /* notify anything attached to the heartbeat events */ | |
965 | dlm_hb_event_notify_attached(dlm, assert->node_idx, 1); | |
966 | ||
967 | spin_unlock(&dlm->spinlock); | |
968 | } | |
969 | spin_unlock(&dlm_domain_lock); | |
970 | ||
971 | return 0; | |
972 | } | |
973 | ||
ea203441 | 974 | static int dlm_match_regions(struct dlm_ctxt *dlm, |
770c4d81 SM |
975 | struct dlm_query_region *qr, |
976 | char *local, int locallen) | |
ea203441 | 977 | { |
770c4d81 | 978 | char *remote = qr->qr_regions; |
ea203441 SM |
979 | char *l, *r; |
980 | int localnr, i, j, foundit; | |
981 | int status = 0; | |
982 | ||
983 | if (!o2hb_global_heartbeat_active()) { | |
984 | if (qr->qr_numregions) { | |
985 | mlog(ML_ERROR, "Domain %s: Joining node %d has global " | |
986 | "heartbeat enabled but local node %d does not\n", | |
987 | qr->qr_domain, qr->qr_node, dlm->node_num); | |
988 | status = -EINVAL; | |
989 | } | |
990 | goto bail; | |
991 | } | |
992 | ||
993 | if (o2hb_global_heartbeat_active() && !qr->qr_numregions) { | |
994 | mlog(ML_ERROR, "Domain %s: Local node %d has global " | |
995 | "heartbeat enabled but joining node %d does not\n", | |
996 | qr->qr_domain, dlm->node_num, qr->qr_node); | |
997 | status = -EINVAL; | |
998 | goto bail; | |
999 | } | |
1000 | ||
1001 | r = remote; | |
1002 | for (i = 0; i < qr->qr_numregions; ++i) { | |
1003 | mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r); | |
1004 | r += O2HB_MAX_REGION_NAME_LEN; | |
1005 | } | |
1006 | ||
770c4d81 SM |
1007 | localnr = min(O2NM_MAX_REGIONS, locallen/O2HB_MAX_REGION_NAME_LEN); |
1008 | localnr = o2hb_get_all_regions(local, (u8)localnr); | |
ea203441 SM |
1009 | |
1010 | /* compare local regions with remote */ | |
1011 | l = local; | |
1012 | for (i = 0; i < localnr; ++i) { | |
1013 | foundit = 0; | |
1014 | r = remote; | |
1015 | for (j = 0; j <= qr->qr_numregions; ++j) { | |
1016 | if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) { | |
1017 | foundit = 1; | |
1018 | break; | |
1019 | } | |
1020 | r += O2HB_MAX_REGION_NAME_LEN; | |
1021 | } | |
1022 | if (!foundit) { | |
1023 | status = -EINVAL; | |
1024 | mlog(ML_ERROR, "Domain %s: Region '%.*s' registered " | |
1025 | "in local node %d but not in joining node %d\n", | |
1026 | qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l, | |
1027 | dlm->node_num, qr->qr_node); | |
1028 | goto bail; | |
1029 | } | |
1030 | l += O2HB_MAX_REGION_NAME_LEN; | |
1031 | } | |
1032 | ||
1033 | /* compare remote with local regions */ | |
1034 | r = remote; | |
1035 | for (i = 0; i < qr->qr_numregions; ++i) { | |
1036 | foundit = 0; | |
1037 | l = local; | |
1038 | for (j = 0; j < localnr; ++j) { | |
1039 | if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) { | |
1040 | foundit = 1; | |
1041 | break; | |
1042 | } | |
1043 | l += O2HB_MAX_REGION_NAME_LEN; | |
1044 | } | |
1045 | if (!foundit) { | |
1046 | status = -EINVAL; | |
1047 | mlog(ML_ERROR, "Domain %s: Region '%.*s' registered " | |
1048 | "in joining node %d but not in local node %d\n", | |
1049 | qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r, | |
1050 | qr->qr_node, dlm->node_num); | |
1051 | goto bail; | |
1052 | } | |
1053 | r += O2HB_MAX_REGION_NAME_LEN; | |
1054 | } | |
1055 | ||
1056 | bail: | |
ea203441 SM |
1057 | return status; |
1058 | } | |
1059 | ||
1060 | static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map) | |
1061 | { | |
1062 | struct dlm_query_region *qr = NULL; | |
1063 | int status, ret = 0, i; | |
1064 | char *p; | |
1065 | ||
1066 | if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES) | |
1067 | goto bail; | |
1068 | ||
1069 | qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL); | |
1070 | if (!qr) { | |
1071 | ret = -ENOMEM; | |
1072 | mlog_errno(ret); | |
1073 | goto bail; | |
1074 | } | |
1075 | ||
1076 | qr->qr_node = dlm->node_num; | |
1077 | qr->qr_namelen = strlen(dlm->name); | |
1078 | memcpy(qr->qr_domain, dlm->name, qr->qr_namelen); | |
1079 | /* if local hb, the numregions will be zero */ | |
1080 | if (o2hb_global_heartbeat_active()) | |
1081 | qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions, | |
1082 | O2NM_MAX_REGIONS); | |
1083 | ||
1084 | p = qr->qr_regions; | |
1085 | for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN) | |
1086 | mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p); | |
1087 | ||
1088 | i = -1; | |
1089 | while ((i = find_next_bit(node_map, O2NM_MAX_NODES, | |
1090 | i + 1)) < O2NM_MAX_NODES) { | |
1091 | if (i == dlm->node_num) | |
1092 | continue; | |
1093 | ||
1094 | mlog(0, "Sending regions to node %d\n", i); | |
1095 | ||
1096 | ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr, | |
1097 | sizeof(struct dlm_query_region), | |
1098 | i, &status); | |
1099 | if (ret >= 0) | |
1100 | ret = status; | |
1101 | if (ret) { | |
1102 | mlog(ML_ERROR, "Region mismatch %d, node %d\n", | |
1103 | ret, i); | |
1104 | break; | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | bail: | |
1109 | kfree(qr); | |
1110 | return ret; | |
1111 | } | |
1112 | ||
1113 | static int dlm_query_region_handler(struct o2net_msg *msg, u32 len, | |
1114 | void *data, void **ret_data) | |
1115 | { | |
1116 | struct dlm_query_region *qr; | |
1117 | struct dlm_ctxt *dlm = NULL; | |
770c4d81 | 1118 | char *local = NULL; |
ea203441 | 1119 | int status = 0; |
ea203441 SM |
1120 | |
1121 | qr = (struct dlm_query_region *) msg->buf; | |
1122 | ||
1123 | mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node, | |
1124 | qr->qr_domain); | |
1125 | ||
770c4d81 SM |
1126 | /* buffer used in dlm_mast_regions() */ |
1127 | local = kmalloc(sizeof(qr->qr_regions), GFP_KERNEL); | |
a35ad97c ZG |
1128 | if (!local) |
1129 | return -ENOMEM; | |
770c4d81 | 1130 | |
ea203441 SM |
1131 | status = -EINVAL; |
1132 | ||
1133 | spin_lock(&dlm_domain_lock); | |
1134 | dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen); | |
1135 | if (!dlm) { | |
1136 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " | |
1137 | "before join domain\n", qr->qr_node, qr->qr_domain); | |
a35ad97c | 1138 | goto out_domain_lock; |
ea203441 SM |
1139 | } |
1140 | ||
1141 | spin_lock(&dlm->spinlock); | |
ea203441 SM |
1142 | if (dlm->joining_node != qr->qr_node) { |
1143 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " | |
1144 | "but joining node is %d\n", qr->qr_node, qr->qr_domain, | |
1145 | dlm->joining_node); | |
a35ad97c | 1146 | goto out_dlm_lock; |
ea203441 SM |
1147 | } |
1148 | ||
1149 | /* Support for global heartbeat was added in 1.1 */ | |
1150 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
1151 | dlm->dlm_locking_proto.pv_minor == 0) { | |
1152 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " | |
1153 | "but active dlm protocol is %d.%d\n", qr->qr_node, | |
1154 | qr->qr_domain, dlm->dlm_locking_proto.pv_major, | |
1155 | dlm->dlm_locking_proto.pv_minor); | |
a35ad97c | 1156 | goto out_dlm_lock; |
ea203441 SM |
1157 | } |
1158 | ||
770c4d81 | 1159 | status = dlm_match_regions(dlm, qr, local, sizeof(qr->qr_regions)); |
ea203441 | 1160 | |
a35ad97c ZG |
1161 | out_dlm_lock: |
1162 | spin_unlock(&dlm->spinlock); | |
1163 | ||
1164 | out_domain_lock: | |
ea203441 SM |
1165 | spin_unlock(&dlm_domain_lock); |
1166 | ||
770c4d81 SM |
1167 | kfree(local); |
1168 | ||
ea203441 SM |
1169 | return status; |
1170 | } | |
1171 | ||
18cfdf1b SM |
1172 | static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn) |
1173 | { | |
1174 | struct o2nm_node *local; | |
1175 | struct dlm_node_info *remote; | |
1176 | int i, j; | |
1177 | int status = 0; | |
1178 | ||
1179 | for (j = 0; j < qn->qn_numnodes; ++j) | |
1180 | mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum, | |
1181 | &(qn->qn_nodes[j].ni_ipv4_address), | |
1182 | ntohs(qn->qn_nodes[j].ni_ipv4_port)); | |
1183 | ||
1184 | for (i = 0; i < O2NM_MAX_NODES && !status; ++i) { | |
1185 | local = o2nm_get_node_by_num(i); | |
1186 | remote = NULL; | |
1187 | for (j = 0; j < qn->qn_numnodes; ++j) { | |
1188 | if (qn->qn_nodes[j].ni_nodenum == i) { | |
1189 | remote = &(qn->qn_nodes[j]); | |
1190 | break; | |
1191 | } | |
1192 | } | |
1193 | ||
1194 | if (!local && !remote) | |
1195 | continue; | |
1196 | ||
1197 | if ((local && !remote) || (!local && remote)) | |
1198 | status = -EINVAL; | |
1199 | ||
1200 | if (!status && | |
1201 | ((remote->ni_nodenum != local->nd_num) || | |
1202 | (remote->ni_ipv4_port != local->nd_ipv4_port) || | |
1203 | (remote->ni_ipv4_address != local->nd_ipv4_address))) | |
1204 | status = -EINVAL; | |
1205 | ||
1206 | if (status) { | |
1207 | if (remote && !local) | |
1208 | mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) " | |
1209 | "registered in joining node %d but not in " | |
1210 | "local node %d\n", qn->qn_domain, | |
1211 | remote->ni_nodenum, | |
1212 | &(remote->ni_ipv4_address), | |
1213 | ntohs(remote->ni_ipv4_port), | |
1214 | qn->qn_nodenum, dlm->node_num); | |
1215 | if (local && !remote) | |
1216 | mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) " | |
1217 | "registered in local node %d but not in " | |
1218 | "joining node %d\n", qn->qn_domain, | |
1219 | local->nd_num, &(local->nd_ipv4_address), | |
1220 | ntohs(local->nd_ipv4_port), | |
1221 | dlm->node_num, qn->qn_nodenum); | |
1222 | BUG_ON((!local && !remote)); | |
1223 | } | |
1224 | ||
1225 | if (local) | |
1226 | o2nm_node_put(local); | |
1227 | } | |
1228 | ||
1229 | return status; | |
1230 | } | |
1231 | ||
1232 | static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map) | |
1233 | { | |
1234 | struct dlm_query_nodeinfo *qn = NULL; | |
1235 | struct o2nm_node *node; | |
1236 | int ret = 0, status, count, i; | |
1237 | ||
1238 | if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES) | |
1239 | goto bail; | |
1240 | ||
1241 | qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL); | |
1242 | if (!qn) { | |
1243 | ret = -ENOMEM; | |
1244 | mlog_errno(ret); | |
1245 | goto bail; | |
1246 | } | |
1247 | ||
1248 | for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) { | |
1249 | node = o2nm_get_node_by_num(i); | |
1250 | if (!node) | |
1251 | continue; | |
1252 | qn->qn_nodes[count].ni_nodenum = node->nd_num; | |
1253 | qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port; | |
1254 | qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address; | |
1255 | mlog(0, "Node %3d, %pI4:%u\n", node->nd_num, | |
1256 | &(node->nd_ipv4_address), ntohs(node->nd_ipv4_port)); | |
1257 | ++count; | |
1258 | o2nm_node_put(node); | |
1259 | } | |
1260 | ||
1261 | qn->qn_nodenum = dlm->node_num; | |
1262 | qn->qn_numnodes = count; | |
1263 | qn->qn_namelen = strlen(dlm->name); | |
1264 | memcpy(qn->qn_domain, dlm->name, qn->qn_namelen); | |
1265 | ||
1266 | i = -1; | |
1267 | while ((i = find_next_bit(node_map, O2NM_MAX_NODES, | |
1268 | i + 1)) < O2NM_MAX_NODES) { | |
1269 | if (i == dlm->node_num) | |
1270 | continue; | |
1271 | ||
1272 | mlog(0, "Sending nodeinfo to node %d\n", i); | |
1273 | ||
1274 | ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY, | |
1275 | qn, sizeof(struct dlm_query_nodeinfo), | |
1276 | i, &status); | |
1277 | if (ret >= 0) | |
1278 | ret = status; | |
1279 | if (ret) { | |
1280 | mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i); | |
1281 | break; | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | bail: | |
1286 | kfree(qn); | |
1287 | return ret; | |
1288 | } | |
1289 | ||
1290 | static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len, | |
1291 | void *data, void **ret_data) | |
1292 | { | |
1293 | struct dlm_query_nodeinfo *qn; | |
1294 | struct dlm_ctxt *dlm = NULL; | |
1295 | int locked = 0, status = -EINVAL; | |
1296 | ||
1297 | qn = (struct dlm_query_nodeinfo *) msg->buf; | |
1298 | ||
1299 | mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum, | |
1300 | qn->qn_domain); | |
1301 | ||
1302 | spin_lock(&dlm_domain_lock); | |
1303 | dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen); | |
1304 | if (!dlm) { | |
1305 | mlog(ML_ERROR, "Node %d queried nodes on domain %s before " | |
1306 | "join domain\n", qn->qn_nodenum, qn->qn_domain); | |
1307 | goto bail; | |
1308 | } | |
1309 | ||
1310 | spin_lock(&dlm->spinlock); | |
1311 | locked = 1; | |
1312 | if (dlm->joining_node != qn->qn_nodenum) { | |
1313 | mlog(ML_ERROR, "Node %d queried nodes on domain %s but " | |
1314 | "joining node is %d\n", qn->qn_nodenum, qn->qn_domain, | |
1315 | dlm->joining_node); | |
1316 | goto bail; | |
1317 | } | |
1318 | ||
1319 | /* Support for node query was added in 1.1 */ | |
1320 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
1321 | dlm->dlm_locking_proto.pv_minor == 0) { | |
1322 | mlog(ML_ERROR, "Node %d queried nodes on domain %s " | |
1323 | "but active dlm protocol is %d.%d\n", qn->qn_nodenum, | |
1324 | qn->qn_domain, dlm->dlm_locking_proto.pv_major, | |
1325 | dlm->dlm_locking_proto.pv_minor); | |
1326 | goto bail; | |
1327 | } | |
1328 | ||
1329 | status = dlm_match_nodes(dlm, qn); | |
1330 | ||
1331 | bail: | |
1332 | if (locked) | |
1333 | spin_unlock(&dlm->spinlock); | |
1334 | spin_unlock(&dlm_domain_lock); | |
1335 | ||
1336 | return status; | |
1337 | } | |
1338 | ||
d74c9803 KH |
1339 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, |
1340 | void **ret_data) | |
6714d8e8 KH |
1341 | { |
1342 | struct dlm_cancel_join *cancel; | |
1343 | struct dlm_ctxt *dlm = NULL; | |
1344 | ||
1345 | cancel = (struct dlm_cancel_join *) msg->buf; | |
1346 | ||
1347 | mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx, | |
1348 | cancel->domain); | |
1349 | ||
1350 | spin_lock(&dlm_domain_lock); | |
1351 | dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len); | |
1352 | ||
1353 | if (dlm) { | |
1354 | spin_lock(&dlm->spinlock); | |
1355 | ||
1356 | /* Yikes, this guy wants to cancel his join. No | |
1357 | * problem, we simply cleanup our join state. */ | |
1358 | BUG_ON(dlm->joining_node != cancel->node_idx); | |
1359 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
1360 | ||
1361 | spin_unlock(&dlm->spinlock); | |
1362 | } | |
1363 | spin_unlock(&dlm_domain_lock); | |
1364 | ||
1365 | return 0; | |
1366 | } | |
1367 | ||
1368 | static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm, | |
1369 | unsigned int node) | |
1370 | { | |
1371 | int status; | |
1372 | struct dlm_cancel_join cancel_msg; | |
1373 | ||
1374 | memset(&cancel_msg, 0, sizeof(cancel_msg)); | |
1375 | cancel_msg.node_idx = dlm->node_num; | |
1376 | cancel_msg.name_len = strlen(dlm->name); | |
1377 | memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len); | |
1378 | ||
1379 | status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
1380 | &cancel_msg, sizeof(cancel_msg), node, | |
1381 | NULL); | |
1382 | if (status < 0) { | |
a5196ec5 WW |
1383 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1384 | "node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
1385 | node); | |
6714d8e8 KH |
1386 | goto bail; |
1387 | } | |
1388 | ||
1389 | bail: | |
1390 | return status; | |
1391 | } | |
1392 | ||
1393 | /* map_size should be in bytes. */ | |
1394 | static int dlm_send_join_cancels(struct dlm_ctxt *dlm, | |
1395 | unsigned long *node_map, | |
1396 | unsigned int map_size) | |
1397 | { | |
1398 | int status, tmpstat; | |
8d67d3c2 | 1399 | int node; |
6714d8e8 KH |
1400 | |
1401 | if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) * | |
1402 | sizeof(unsigned long))) { | |
1403 | mlog(ML_ERROR, | |
1404 | "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n", | |
3a4780a8 | 1405 | map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES)); |
6714d8e8 KH |
1406 | return -EINVAL; |
1407 | } | |
1408 | ||
1409 | status = 0; | |
1410 | node = -1; | |
1411 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, | |
1412 | node + 1)) < O2NM_MAX_NODES) { | |
1413 | if (node == dlm->node_num) | |
1414 | continue; | |
1415 | ||
1416 | tmpstat = dlm_send_one_join_cancel(dlm, node); | |
1417 | if (tmpstat) { | |
1418 | mlog(ML_ERROR, "Error return %d cancelling join on " | |
1419 | "node %d\n", tmpstat, node); | |
1420 | if (!status) | |
1421 | status = tmpstat; | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | if (status) | |
1426 | mlog_errno(status); | |
1427 | return status; | |
1428 | } | |
1429 | ||
1430 | static int dlm_request_join(struct dlm_ctxt *dlm, | |
1431 | int node, | |
d24fbcda | 1432 | enum dlm_query_join_response_code *response) |
6714d8e8 | 1433 | { |
d24fbcda | 1434 | int status; |
6714d8e8 | 1435 | struct dlm_query_join_request join_msg; |
0f71b7b4 JB |
1436 | struct dlm_query_join_packet packet; |
1437 | u32 join_resp; | |
6714d8e8 KH |
1438 | |
1439 | mlog(0, "querying node %d\n", node); | |
1440 | ||
1441 | memset(&join_msg, 0, sizeof(join_msg)); | |
1442 | join_msg.node_idx = dlm->node_num; | |
1443 | join_msg.name_len = strlen(dlm->name); | |
1444 | memcpy(join_msg.domain, dlm->name, join_msg.name_len); | |
d24fbcda JB |
1445 | join_msg.dlm_proto = dlm->dlm_locking_proto; |
1446 | join_msg.fs_proto = dlm->fs_locking_proto; | |
6714d8e8 | 1447 | |
1faf2894 SE |
1448 | /* copy live node map to join message */ |
1449 | byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES); | |
1450 | ||
6714d8e8 | 1451 | status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg, |
a5196ec5 | 1452 | sizeof(join_msg), node, &join_resp); |
6714d8e8 | 1453 | if (status < 0 && status != -ENOPROTOOPT) { |
a5196ec5 WW |
1454 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1455 | "node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, | |
1456 | node); | |
6714d8e8 KH |
1457 | goto bail; |
1458 | } | |
0f71b7b4 | 1459 | dlm_query_join_wire_to_packet(join_resp, &packet); |
6714d8e8 KH |
1460 | |
1461 | /* -ENOPROTOOPT from the net code means the other side isn't | |
1462 | listening for our message type -- that's fine, it means | |
1463 | his dlm isn't up, so we can consider him a 'yes' but not | |
1464 | joined into the domain. */ | |
1465 | if (status == -ENOPROTOOPT) { | |
1466 | status = 0; | |
1467 | *response = JOIN_OK_NO_MAP; | |
6714d8e8 | 1468 | } else { |
72f6fe1f NZ |
1469 | *response = packet.code; |
1470 | switch (packet.code) { | |
1471 | case JOIN_DISALLOW: | |
1472 | case JOIN_OK_NO_MAP: | |
1473 | break; | |
1474 | case JOIN_PROTOCOL_MISMATCH: | |
1475 | mlog(ML_NOTICE, | |
1476 | "This node requested DLM locking protocol %u.%u and " | |
1477 | "filesystem locking protocol %u.%u. At least one of " | |
1478 | "the protocol versions on node %d is not compatible, " | |
1479 | "disconnecting\n", | |
1480 | dlm->dlm_locking_proto.pv_major, | |
1481 | dlm->dlm_locking_proto.pv_minor, | |
1482 | dlm->fs_locking_proto.pv_major, | |
1483 | dlm->fs_locking_proto.pv_minor, | |
1484 | node); | |
1485 | status = -EPROTO; | |
1486 | break; | |
1487 | case JOIN_OK: | |
1488 | /* Use the same locking protocol as the remote node */ | |
1489 | dlm->dlm_locking_proto.pv_minor = packet.dlm_minor; | |
1490 | dlm->fs_locking_proto.pv_minor = packet.fs_minor; | |
1491 | mlog(0, | |
1492 | "Node %d responds JOIN_OK with DLM locking protocol " | |
1493 | "%u.%u and fs locking protocol %u.%u\n", | |
1494 | node, | |
1495 | dlm->dlm_locking_proto.pv_major, | |
1496 | dlm->dlm_locking_proto.pv_minor, | |
1497 | dlm->fs_locking_proto.pv_major, | |
1498 | dlm->fs_locking_proto.pv_minor); | |
1499 | break; | |
1500 | default: | |
1501 | status = -EINVAL; | |
1502 | mlog(ML_ERROR, "invalid response %d from node %u\n", | |
1503 | packet.code, node); | |
1504 | /* Reset response to JOIN_DISALLOW */ | |
1505 | *response = JOIN_DISALLOW; | |
1506 | break; | |
1507 | } | |
6714d8e8 KH |
1508 | } |
1509 | ||
1510 | mlog(0, "status %d, node %d response is %d\n", status, node, | |
0f71b7b4 | 1511 | *response); |
6714d8e8 KH |
1512 | |
1513 | bail: | |
1514 | return status; | |
1515 | } | |
1516 | ||
1517 | static int dlm_send_one_join_assert(struct dlm_ctxt *dlm, | |
1518 | unsigned int node) | |
1519 | { | |
1520 | int status; | |
01c6222f | 1521 | int ret; |
6714d8e8 KH |
1522 | struct dlm_assert_joined assert_msg; |
1523 | ||
1524 | mlog(0, "Sending join assert to node %u\n", node); | |
1525 | ||
1526 | memset(&assert_msg, 0, sizeof(assert_msg)); | |
1527 | assert_msg.node_idx = dlm->node_num; | |
1528 | assert_msg.name_len = strlen(dlm->name); | |
1529 | memcpy(assert_msg.domain, dlm->name, assert_msg.name_len); | |
1530 | ||
1531 | status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1532 | &assert_msg, sizeof(assert_msg), node, | |
01c6222f | 1533 | &ret); |
6714d8e8 | 1534 | if (status < 0) |
a5196ec5 WW |
1535 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1536 | "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1537 | node); | |
01c6222f X |
1538 | else |
1539 | status = ret; | |
6714d8e8 KH |
1540 | |
1541 | return status; | |
1542 | } | |
1543 | ||
1544 | static void dlm_send_join_asserts(struct dlm_ctxt *dlm, | |
1545 | unsigned long *node_map) | |
1546 | { | |
1547 | int status, node, live; | |
1548 | ||
1549 | status = 0; | |
1550 | node = -1; | |
1551 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, | |
1552 | node + 1)) < O2NM_MAX_NODES) { | |
1553 | if (node == dlm->node_num) | |
1554 | continue; | |
1555 | ||
1556 | do { | |
1557 | /* It is very important that this message be | |
1558 | * received so we spin until either the node | |
1559 | * has died or it gets the message. */ | |
1560 | status = dlm_send_one_join_assert(dlm, node); | |
1561 | ||
1562 | spin_lock(&dlm->spinlock); | |
1563 | live = test_bit(node, dlm->live_nodes_map); | |
1564 | spin_unlock(&dlm->spinlock); | |
1565 | ||
1566 | if (status) { | |
1567 | mlog(ML_ERROR, "Error return %d asserting " | |
1568 | "join on node %d\n", status, node); | |
1569 | ||
1570 | /* give us some time between errors... */ | |
1571 | if (live) | |
1572 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
1573 | } | |
1574 | } while (status && live); | |
1575 | } | |
1576 | } | |
1577 | ||
1578 | struct domain_join_ctxt { | |
1579 | unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1580 | unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1581 | }; | |
1582 | ||
1583 | static int dlm_should_restart_join(struct dlm_ctxt *dlm, | |
1584 | struct domain_join_ctxt *ctxt, | |
d24fbcda | 1585 | enum dlm_query_join_response_code response) |
6714d8e8 KH |
1586 | { |
1587 | int ret; | |
1588 | ||
1589 | if (response == JOIN_DISALLOW) { | |
1590 | mlog(0, "Latest response of disallow -- should restart\n"); | |
1591 | return 1; | |
1592 | } | |
1593 | ||
1594 | spin_lock(&dlm->spinlock); | |
1595 | /* For now, we restart the process if the node maps have | |
1596 | * changed at all */ | |
1597 | ret = memcmp(ctxt->live_map, dlm->live_nodes_map, | |
1598 | sizeof(dlm->live_nodes_map)); | |
1599 | spin_unlock(&dlm->spinlock); | |
1600 | ||
1601 | if (ret) | |
1602 | mlog(0, "Node maps changed -- should restart\n"); | |
1603 | ||
1604 | return ret; | |
1605 | } | |
1606 | ||
1607 | static int dlm_try_to_join_domain(struct dlm_ctxt *dlm) | |
1608 | { | |
1609 | int status = 0, tmpstat, node; | |
1610 | struct domain_join_ctxt *ctxt; | |
d24fbcda | 1611 | enum dlm_query_join_response_code response = JOIN_DISALLOW; |
6714d8e8 | 1612 | |
ef6b689b | 1613 | mlog(0, "%p", dlm); |
6714d8e8 | 1614 | |
cd861280 | 1615 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); |
6714d8e8 KH |
1616 | if (!ctxt) { |
1617 | status = -ENOMEM; | |
1618 | mlog_errno(status); | |
1619 | goto bail; | |
1620 | } | |
1621 | ||
1622 | /* group sem locking should work for us here -- we're already | |
1623 | * registered for heartbeat events so filling this should be | |
1624 | * atomic wrt getting those handlers called. */ | |
1625 | o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map)); | |
1626 | ||
1627 | spin_lock(&dlm->spinlock); | |
1628 | memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map)); | |
1629 | ||
1630 | __dlm_set_joining_node(dlm, dlm->node_num); | |
1631 | ||
1632 | spin_unlock(&dlm->spinlock); | |
1633 | ||
1634 | node = -1; | |
1635 | while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES, | |
1636 | node + 1)) < O2NM_MAX_NODES) { | |
1637 | if (node == dlm->node_num) | |
1638 | continue; | |
1639 | ||
1640 | status = dlm_request_join(dlm, node, &response); | |
1641 | if (status < 0) { | |
1642 | mlog_errno(status); | |
1643 | goto bail; | |
1644 | } | |
1645 | ||
1646 | /* Ok, either we got a response or the node doesn't have a | |
1647 | * dlm up. */ | |
1648 | if (response == JOIN_OK) | |
1649 | set_bit(node, ctxt->yes_resp_map); | |
1650 | ||
1651 | if (dlm_should_restart_join(dlm, ctxt, response)) { | |
1652 | status = -EAGAIN; | |
1653 | goto bail; | |
1654 | } | |
1655 | } | |
1656 | ||
1657 | mlog(0, "Yay, done querying nodes!\n"); | |
1658 | ||
1659 | /* Yay, everyone agree's we can join the domain. My domain is | |
1660 | * comprised of all nodes who were put in the | |
1661 | * yes_resp_map. Copy that into our domain map and send a join | |
1662 | * assert message to clean up everyone elses state. */ | |
1663 | spin_lock(&dlm->spinlock); | |
1664 | memcpy(dlm->domain_map, ctxt->yes_resp_map, | |
1665 | sizeof(ctxt->yes_resp_map)); | |
1666 | set_bit(dlm->node_num, dlm->domain_map); | |
1667 | spin_unlock(&dlm->spinlock); | |
1668 | ||
18cfdf1b | 1669 | /* Support for global heartbeat and node info was added in 1.1 */ |
4da6dc29 SM |
1670 | if (dlm->dlm_locking_proto.pv_major > 1 || |
1671 | dlm->dlm_locking_proto.pv_minor > 0) { | |
18cfdf1b SM |
1672 | status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map); |
1673 | if (status) { | |
1674 | mlog_errno(status); | |
1675 | goto bail; | |
1676 | } | |
ea203441 SM |
1677 | status = dlm_send_regions(dlm, ctxt->yes_resp_map); |
1678 | if (status) { | |
1679 | mlog_errno(status); | |
1680 | goto bail; | |
1681 | } | |
1682 | } | |
1683 | ||
6714d8e8 KH |
1684 | dlm_send_join_asserts(dlm, ctxt->yes_resp_map); |
1685 | ||
1686 | /* Joined state *must* be set before the joining node | |
1687 | * information, otherwise the query_join handler may read no | |
1688 | * current joiner but a state of NEW and tell joining nodes | |
1689 | * we're not in the domain. */ | |
1690 | spin_lock(&dlm_domain_lock); | |
1691 | dlm->dlm_state = DLM_CTXT_JOINED; | |
1692 | dlm->num_joins++; | |
1693 | spin_unlock(&dlm_domain_lock); | |
1694 | ||
1695 | bail: | |
1696 | spin_lock(&dlm->spinlock); | |
1697 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
8decab3c SM |
1698 | if (!status) { |
1699 | printk(KERN_NOTICE "o2dlm: Joining domain %s ", dlm->name); | |
6714d8e8 | 1700 | __dlm_print_nodes(dlm); |
8decab3c | 1701 | } |
6714d8e8 KH |
1702 | spin_unlock(&dlm->spinlock); |
1703 | ||
1704 | if (ctxt) { | |
1705 | /* Do we need to send a cancel message to any nodes? */ | |
1706 | if (status < 0) { | |
1707 | tmpstat = dlm_send_join_cancels(dlm, | |
1708 | ctxt->yes_resp_map, | |
1709 | sizeof(ctxt->yes_resp_map)); | |
1710 | if (tmpstat < 0) | |
1711 | mlog_errno(tmpstat); | |
1712 | } | |
1713 | kfree(ctxt); | |
1714 | } | |
1715 | ||
1716 | mlog(0, "returning %d\n", status); | |
1717 | return status; | |
1718 | } | |
1719 | ||
1720 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm) | |
1721 | { | |
58a3158a SM |
1722 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up); |
1723 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down); | |
6714d8e8 KH |
1724 | o2net_unregister_handler_list(&dlm->dlm_domain_handlers); |
1725 | } | |
1726 | ||
1727 | static int dlm_register_domain_handlers(struct dlm_ctxt *dlm) | |
1728 | { | |
1729 | int status; | |
1730 | ||
1731 | mlog(0, "registering handlers.\n"); | |
1732 | ||
1733 | o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB, | |
1734 | dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI); | |
cdd09f49 JQ |
1735 | o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB, |
1736 | dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI); | |
1737 | ||
58a3158a | 1738 | status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down); |
6714d8e8 KH |
1739 | if (status) |
1740 | goto bail; | |
1741 | ||
58a3158a | 1742 | status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up); |
6714d8e8 KH |
1743 | if (status) |
1744 | goto bail; | |
1745 | ||
1746 | status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key, | |
1747 | sizeof(struct dlm_master_request), | |
1748 | dlm_master_request_handler, | |
d74c9803 | 1749 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1750 | if (status) |
1751 | goto bail; | |
1752 | ||
1753 | status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key, | |
1754 | sizeof(struct dlm_assert_master), | |
1755 | dlm_assert_master_handler, | |
3b8118cf KH |
1756 | dlm, dlm_assert_master_post_handler, |
1757 | &dlm->dlm_domain_handlers); | |
6714d8e8 KH |
1758 | if (status) |
1759 | goto bail; | |
1760 | ||
1761 | status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key, | |
1762 | sizeof(struct dlm_create_lock), | |
1763 | dlm_create_lock_handler, | |
d74c9803 | 1764 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1765 | if (status) |
1766 | goto bail; | |
1767 | ||
1768 | status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key, | |
1769 | DLM_CONVERT_LOCK_MAX_LEN, | |
1770 | dlm_convert_lock_handler, | |
d74c9803 | 1771 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1772 | if (status) |
1773 | goto bail; | |
1774 | ||
1775 | status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key, | |
1776 | DLM_UNLOCK_LOCK_MAX_LEN, | |
1777 | dlm_unlock_lock_handler, | |
d74c9803 | 1778 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1779 | if (status) |
1780 | goto bail; | |
1781 | ||
1782 | status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key, | |
1783 | DLM_PROXY_AST_MAX_LEN, | |
1784 | dlm_proxy_ast_handler, | |
d74c9803 | 1785 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1786 | if (status) |
1787 | goto bail; | |
1788 | ||
1789 | status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key, | |
1790 | sizeof(struct dlm_exit_domain), | |
1791 | dlm_exit_domain_handler, | |
d74c9803 | 1792 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1793 | if (status) |
1794 | goto bail; | |
1795 | ||
ba2bf218 KH |
1796 | status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key, |
1797 | sizeof(struct dlm_deref_lockres), | |
1798 | dlm_deref_lockres_handler, | |
d74c9803 | 1799 | dlm, NULL, &dlm->dlm_domain_handlers); |
ba2bf218 KH |
1800 | if (status) |
1801 | goto bail; | |
1802 | ||
6714d8e8 KH |
1803 | status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key, |
1804 | sizeof(struct dlm_migrate_request), | |
1805 | dlm_migrate_request_handler, | |
d74c9803 | 1806 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1807 | if (status) |
1808 | goto bail; | |
1809 | ||
1810 | status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key, | |
1811 | DLM_MIG_LOCKRES_MAX_LEN, | |
1812 | dlm_mig_lockres_handler, | |
d74c9803 | 1813 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1814 | if (status) |
1815 | goto bail; | |
1816 | ||
1817 | status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key, | |
1818 | sizeof(struct dlm_master_requery), | |
1819 | dlm_master_requery_handler, | |
d74c9803 | 1820 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1821 | if (status) |
1822 | goto bail; | |
1823 | ||
1824 | status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key, | |
1825 | sizeof(struct dlm_lock_request), | |
1826 | dlm_request_all_locks_handler, | |
d74c9803 | 1827 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1828 | if (status) |
1829 | goto bail; | |
1830 | ||
1831 | status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key, | |
1832 | sizeof(struct dlm_reco_data_done), | |
1833 | dlm_reco_data_done_handler, | |
d74c9803 | 1834 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1835 | if (status) |
1836 | goto bail; | |
1837 | ||
1838 | status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key, | |
1839 | sizeof(struct dlm_begin_reco), | |
1840 | dlm_begin_reco_handler, | |
d74c9803 | 1841 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1842 | if (status) |
1843 | goto bail; | |
1844 | ||
1845 | status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key, | |
1846 | sizeof(struct dlm_finalize_reco), | |
1847 | dlm_finalize_reco_handler, | |
d74c9803 | 1848 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1849 | if (status) |
1850 | goto bail; | |
1851 | ||
bddefdee SM |
1852 | status = o2net_register_handler(DLM_BEGIN_EXIT_DOMAIN_MSG, dlm->key, |
1853 | sizeof(struct dlm_exit_domain), | |
1854 | dlm_begin_exit_domain_handler, | |
1855 | dlm, NULL, &dlm->dlm_domain_handlers); | |
60d663cb | 1856 | if (status) |
1857 | goto bail; | |
bddefdee | 1858 | |
60d663cb | 1859 | status = o2net_register_handler(DLM_DEREF_LOCKRES_DONE, dlm->key, |
1860 | sizeof(struct dlm_deref_lockres_done), | |
1861 | dlm_deref_lockres_done_handler, | |
1862 | dlm, NULL, &dlm->dlm_domain_handlers); | |
6714d8e8 KH |
1863 | bail: |
1864 | if (status) | |
1865 | dlm_unregister_domain_handlers(dlm); | |
1866 | ||
1867 | return status; | |
1868 | } | |
1869 | ||
1870 | static int dlm_join_domain(struct dlm_ctxt *dlm) | |
1871 | { | |
1872 | int status; | |
0dd82141 SM |
1873 | unsigned int backoff; |
1874 | unsigned int total_backoff = 0; | |
5afc44e2 | 1875 | char wq_name[O2NM_MAX_NAME_LEN]; |
6714d8e8 KH |
1876 | |
1877 | BUG_ON(!dlm); | |
1878 | ||
1879 | mlog(0, "Join domain %s\n", dlm->name); | |
1880 | ||
1881 | status = dlm_register_domain_handlers(dlm); | |
1882 | if (status) { | |
1883 | mlog_errno(status); | |
1884 | goto bail; | |
1885 | } | |
1886 | ||
181a9a04 | 1887 | status = dlm_launch_thread(dlm); |
007dce53 SM |
1888 | if (status < 0) { |
1889 | mlog_errno(status); | |
1890 | goto bail; | |
1891 | } | |
1892 | ||
181a9a04 | 1893 | status = dlm_launch_recovery_thread(dlm); |
6714d8e8 KH |
1894 | if (status < 0) { |
1895 | mlog_errno(status); | |
1896 | goto bail; | |
1897 | } | |
1898 | ||
181a9a04 | 1899 | status = dlm_debug_init(dlm); |
6714d8e8 KH |
1900 | if (status < 0) { |
1901 | mlog_errno(status); | |
1902 | goto bail; | |
1903 | } | |
1904 | ||
5afc44e2 | 1905 | snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name); |
055fdcff | 1906 | dlm->dlm_worker = alloc_workqueue(wq_name, WQ_MEM_RECLAIM, 0); |
3156d267 KH |
1907 | if (!dlm->dlm_worker) { |
1908 | status = -ENOMEM; | |
1909 | mlog_errno(status); | |
1910 | goto bail; | |
1911 | } | |
1912 | ||
6714d8e8 | 1913 | do { |
6714d8e8 KH |
1914 | status = dlm_try_to_join_domain(dlm); |
1915 | ||
1916 | /* If we're racing another node to the join, then we | |
1917 | * need to back off temporarily and let them | |
1918 | * complete. */ | |
0dd82141 | 1919 | #define DLM_JOIN_TIMEOUT_MSECS 90000 |
6714d8e8 KH |
1920 | if (status == -EAGAIN) { |
1921 | if (signal_pending(current)) { | |
1922 | status = -ERESTARTSYS; | |
1923 | goto bail; | |
1924 | } | |
1925 | ||
7567c148 | 1926 | if (total_backoff > DLM_JOIN_TIMEOUT_MSECS) { |
0dd82141 SM |
1927 | status = -ERESTARTSYS; |
1928 | mlog(ML_NOTICE, "Timed out joining dlm domain " | |
1929 | "%s after %u msecs\n", dlm->name, | |
7567c148 | 1930 | total_backoff); |
0dd82141 SM |
1931 | goto bail; |
1932 | } | |
1933 | ||
6714d8e8 KH |
1934 | /* |
1935 | * <chip> After you! | |
1936 | * <dale> No, after you! | |
1937 | * <chip> I insist! | |
1938 | * <dale> But you first! | |
1939 | * ... | |
1940 | */ | |
1941 | backoff = (unsigned int)(jiffies & 0x3); | |
1942 | backoff *= DLM_DOMAIN_BACKOFF_MS; | |
0dd82141 | 1943 | total_backoff += backoff; |
6714d8e8 KH |
1944 | mlog(0, "backoff %d\n", backoff); |
1945 | msleep(backoff); | |
1946 | } | |
1947 | } while (status == -EAGAIN); | |
1948 | ||
1949 | if (status < 0) { | |
1950 | mlog_errno(status); | |
1951 | goto bail; | |
1952 | } | |
1953 | ||
1954 | status = 0; | |
1955 | bail: | |
1956 | wake_up(&dlm_domain_events); | |
1957 | ||
1958 | if (status) { | |
1959 | dlm_unregister_domain_handlers(dlm); | |
007dce53 | 1960 | dlm_debug_shutdown(dlm); |
6714d8e8 KH |
1961 | dlm_complete_thread(dlm); |
1962 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 1963 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
1964 | } |
1965 | ||
1966 | return status; | |
1967 | } | |
1968 | ||
1969 | static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain, | |
1970 | u32 key) | |
1971 | { | |
1972 | int i; | |
6325b4a2 | 1973 | int ret; |
6714d8e8 KH |
1974 | struct dlm_ctxt *dlm = NULL; |
1975 | ||
cd861280 | 1976 | dlm = kzalloc(sizeof(*dlm), GFP_KERNEL); |
6714d8e8 | 1977 | if (!dlm) { |
190a7721 JQ |
1978 | ret = -ENOMEM; |
1979 | mlog_errno(ret); | |
6714d8e8 KH |
1980 | goto leave; |
1981 | } | |
1982 | ||
316ce2ba | 1983 | dlm->name = kstrdup(domain, GFP_KERNEL); |
6714d8e8 | 1984 | if (dlm->name == NULL) { |
190a7721 JQ |
1985 | ret = -ENOMEM; |
1986 | mlog_errno(ret); | |
6714d8e8 KH |
1987 | goto leave; |
1988 | } | |
1989 | ||
03d864c0 | 1990 | dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES); |
81f2094a | 1991 | if (!dlm->lockres_hash) { |
190a7721 JQ |
1992 | ret = -ENOMEM; |
1993 | mlog_errno(ret); | |
6714d8e8 KH |
1994 | goto leave; |
1995 | } | |
6714d8e8 | 1996 | |
03d864c0 DP |
1997 | for (i = 0; i < DLM_HASH_BUCKETS; i++) |
1998 | INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i)); | |
6714d8e8 | 1999 | |
e2b66ddc SM |
2000 | dlm->master_hash = (struct hlist_head **) |
2001 | dlm_alloc_pagevec(DLM_HASH_PAGES); | |
2002 | if (!dlm->master_hash) { | |
190a7721 JQ |
2003 | ret = -ENOMEM; |
2004 | mlog_errno(ret); | |
e2b66ddc SM |
2005 | goto leave; |
2006 | } | |
2007 | ||
2008 | for (i = 0; i < DLM_HASH_BUCKETS; i++) | |
2009 | INIT_HLIST_HEAD(dlm_master_hash(dlm, i)); | |
2010 | ||
6714d8e8 KH |
2011 | dlm->key = key; |
2012 | dlm->node_num = o2nm_this_node(); | |
2013 | ||
6325b4a2 | 2014 | ret = dlm_create_debugfs_subroot(dlm); |
190a7721 | 2015 | if (ret < 0) |
6325b4a2 | 2016 | goto leave; |
6325b4a2 | 2017 | |
6714d8e8 KH |
2018 | spin_lock_init(&dlm->spinlock); |
2019 | spin_lock_init(&dlm->master_lock); | |
2020 | spin_lock_init(&dlm->ast_lock); | |
b0d4f817 | 2021 | spin_lock_init(&dlm->track_lock); |
6714d8e8 KH |
2022 | INIT_LIST_HEAD(&dlm->list); |
2023 | INIT_LIST_HEAD(&dlm->dirty_list); | |
2024 | INIT_LIST_HEAD(&dlm->reco.resources); | |
6714d8e8 KH |
2025 | INIT_LIST_HEAD(&dlm->reco.node_data); |
2026 | INIT_LIST_HEAD(&dlm->purge_list); | |
2027 | INIT_LIST_HEAD(&dlm->dlm_domain_handlers); | |
29576f8b | 2028 | INIT_LIST_HEAD(&dlm->tracking_list); |
6714d8e8 KH |
2029 | dlm->reco.state = 0; |
2030 | ||
2031 | INIT_LIST_HEAD(&dlm->pending_asts); | |
2032 | INIT_LIST_HEAD(&dlm->pending_basts); | |
2033 | ||
2034 | mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n", | |
2035 | dlm->recovery_map, &(dlm->recovery_map[0])); | |
2036 | ||
2037 | memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map)); | |
2038 | memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map)); | |
2039 | memset(dlm->domain_map, 0, sizeof(dlm->domain_map)); | |
2040 | ||
2041 | dlm->dlm_thread_task = NULL; | |
2042 | dlm->dlm_reco_thread_task = NULL; | |
3156d267 | 2043 | dlm->dlm_worker = NULL; |
6714d8e8 KH |
2044 | init_waitqueue_head(&dlm->dlm_thread_wq); |
2045 | init_waitqueue_head(&dlm->dlm_reco_thread_wq); | |
2046 | init_waitqueue_head(&dlm->reco.event); | |
2047 | init_waitqueue_head(&dlm->ast_wq); | |
2048 | init_waitqueue_head(&dlm->migration_wq); | |
6714d8e8 KH |
2049 | INIT_LIST_HEAD(&dlm->mle_hb_events); |
2050 | ||
2051 | dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN; | |
2052 | init_waitqueue_head(&dlm->dlm_join_events); | |
2053 | ||
60c7ec9e | 2054 | dlm->migrate_done = 0; |
2055 | ||
6714d8e8 KH |
2056 | dlm->reco.new_master = O2NM_INVALID_NODE_NUM; |
2057 | dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; | |
6714d8e8 | 2058 | |
6800791a SM |
2059 | atomic_set(&dlm->res_tot_count, 0); |
2060 | atomic_set(&dlm->res_cur_count, 0); | |
2041d8fd SM |
2061 | for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) { |
2062 | atomic_set(&dlm->mle_tot_count[i], 0); | |
2063 | atomic_set(&dlm->mle_cur_count[i], 0); | |
2064 | } | |
2065 | ||
6714d8e8 KH |
2066 | spin_lock_init(&dlm->work_lock); |
2067 | INIT_LIST_HEAD(&dlm->work_list); | |
c4028958 | 2068 | INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work); |
6714d8e8 KH |
2069 | |
2070 | kref_init(&dlm->dlm_refs); | |
2071 | dlm->dlm_state = DLM_CTXT_NEW; | |
2072 | ||
2073 | INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks); | |
2074 | ||
2075 | mlog(0, "context init: refcount %u\n", | |
2c935bc5 | 2076 | kref_read(&dlm->dlm_refs)); |
6714d8e8 KH |
2077 | |
2078 | leave: | |
190a7721 JQ |
2079 | if (ret < 0 && dlm) { |
2080 | if (dlm->master_hash) | |
2081 | dlm_free_pagevec((void **)dlm->master_hash, | |
2082 | DLM_HASH_PAGES); | |
2083 | ||
2084 | if (dlm->lockres_hash) | |
2085 | dlm_free_pagevec((void **)dlm->lockres_hash, | |
2086 | DLM_HASH_PAGES); | |
2087 | ||
2088 | kfree(dlm->name); | |
2089 | kfree(dlm); | |
2090 | dlm = NULL; | |
2091 | } | |
6714d8e8 KH |
2092 | return dlm; |
2093 | } | |
2094 | ||
2095 | /* | |
d24fbcda JB |
2096 | * Compare a requested locking protocol version against the current one. |
2097 | * | |
2098 | * If the major numbers are different, they are incompatible. | |
2099 | * If the current minor is greater than the request, they are incompatible. | |
2100 | * If the current minor is less than or equal to the request, they are | |
2101 | * compatible, and the requester should run at the current minor version. | |
2102 | */ | |
2103 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, | |
2104 | struct dlm_protocol_version *request) | |
2105 | { | |
2106 | if (existing->pv_major != request->pv_major) | |
2107 | return 1; | |
2108 | ||
2109 | if (existing->pv_minor > request->pv_minor) | |
2110 | return 1; | |
2111 | ||
2112 | if (existing->pv_minor < request->pv_minor) | |
2113 | request->pv_minor = existing->pv_minor; | |
2114 | ||
2115 | return 0; | |
2116 | } | |
2117 | ||
2118 | /* | |
2119 | * dlm_register_domain: one-time setup per "domain". | |
2120 | * | |
2121 | * The filesystem passes in the requested locking version via proto. | |
2122 | * If registration was successful, proto will contain the negotiated | |
2123 | * locking protocol. | |
6714d8e8 KH |
2124 | */ |
2125 | struct dlm_ctxt * dlm_register_domain(const char *domain, | |
d24fbcda JB |
2126 | u32 key, |
2127 | struct dlm_protocol_version *fs_proto) | |
6714d8e8 KH |
2128 | { |
2129 | int ret; | |
2130 | struct dlm_ctxt *dlm = NULL; | |
2131 | struct dlm_ctxt *new_ctxt = NULL; | |
2132 | ||
e372357b | 2133 | if (strlen(domain) >= O2NM_MAX_NAME_LEN) { |
6714d8e8 KH |
2134 | ret = -ENAMETOOLONG; |
2135 | mlog(ML_ERROR, "domain name length too long\n"); | |
2136 | goto leave; | |
2137 | } | |
2138 | ||
6714d8e8 KH |
2139 | mlog(0, "register called for domain \"%s\"\n", domain); |
2140 | ||
2141 | retry: | |
2142 | dlm = NULL; | |
2143 | if (signal_pending(current)) { | |
2144 | ret = -ERESTARTSYS; | |
2145 | mlog_errno(ret); | |
2146 | goto leave; | |
2147 | } | |
2148 | ||
2149 | spin_lock(&dlm_domain_lock); | |
2150 | ||
2151 | dlm = __dlm_lookup_domain(domain); | |
2152 | if (dlm) { | |
2153 | if (dlm->dlm_state != DLM_CTXT_JOINED) { | |
2154 | spin_unlock(&dlm_domain_lock); | |
2155 | ||
2156 | mlog(0, "This ctxt is not joined yet!\n"); | |
2157 | wait_event_interruptible(dlm_domain_events, | |
2158 | dlm_wait_on_domain_helper( | |
2159 | domain)); | |
2160 | goto retry; | |
2161 | } | |
2162 | ||
d24fbcda | 2163 | if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) { |
6469272c | 2164 | spin_unlock(&dlm_domain_lock); |
d24fbcda JB |
2165 | mlog(ML_ERROR, |
2166 | "Requested locking protocol version is not " | |
2167 | "compatible with already registered domain " | |
2168 | "\"%s\"\n", domain); | |
2169 | ret = -EPROTO; | |
2170 | goto leave; | |
2171 | } | |
2172 | ||
6714d8e8 KH |
2173 | __dlm_get(dlm); |
2174 | dlm->num_joins++; | |
2175 | ||
2176 | spin_unlock(&dlm_domain_lock); | |
2177 | ||
2178 | ret = 0; | |
2179 | goto leave; | |
2180 | } | |
2181 | ||
2182 | /* doesn't exist */ | |
2183 | if (!new_ctxt) { | |
2184 | spin_unlock(&dlm_domain_lock); | |
2185 | ||
2186 | new_ctxt = dlm_alloc_ctxt(domain, key); | |
2187 | if (new_ctxt) | |
2188 | goto retry; | |
2189 | ||
2190 | ret = -ENOMEM; | |
2191 | mlog_errno(ret); | |
2192 | goto leave; | |
2193 | } | |
2194 | ||
2195 | /* a little variable switch-a-roo here... */ | |
2196 | dlm = new_ctxt; | |
2197 | new_ctxt = NULL; | |
2198 | ||
2199 | /* add the new domain */ | |
2200 | list_add_tail(&dlm->list, &dlm_domains); | |
2201 | spin_unlock(&dlm_domain_lock); | |
2202 | ||
d24fbcda JB |
2203 | /* |
2204 | * Pass the locking protocol version into the join. If the join | |
2205 | * succeeds, it will have the negotiated protocol set. | |
2206 | */ | |
2207 | dlm->dlm_locking_proto = dlm_protocol; | |
2208 | dlm->fs_locking_proto = *fs_proto; | |
2209 | ||
6714d8e8 KH |
2210 | ret = dlm_join_domain(dlm); |
2211 | if (ret) { | |
2212 | mlog_errno(ret); | |
2213 | dlm_put(dlm); | |
2214 | goto leave; | |
2215 | } | |
2216 | ||
d24fbcda JB |
2217 | /* Tell the caller what locking protocol we negotiated */ |
2218 | *fs_proto = dlm->fs_locking_proto; | |
2219 | ||
6714d8e8 KH |
2220 | ret = 0; |
2221 | leave: | |
2222 | if (new_ctxt) | |
2223 | dlm_free_ctxt_mem(new_ctxt); | |
2224 | ||
2225 | if (ret < 0) | |
2226 | dlm = ERR_PTR(ret); | |
2227 | ||
2228 | return dlm; | |
2229 | } | |
2230 | EXPORT_SYMBOL_GPL(dlm_register_domain); | |
2231 | ||
2232 | static LIST_HEAD(dlm_join_handlers); | |
2233 | ||
2234 | static void dlm_unregister_net_handlers(void) | |
2235 | { | |
2236 | o2net_unregister_handler_list(&dlm_join_handlers); | |
2237 | } | |
2238 | ||
2239 | static int dlm_register_net_handlers(void) | |
2240 | { | |
2241 | int status = 0; | |
2242 | ||
2243 | status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, | |
2244 | sizeof(struct dlm_query_join_request), | |
2245 | dlm_query_join_handler, | |
d74c9803 | 2246 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
2247 | if (status) |
2248 | goto bail; | |
2249 | ||
2250 | status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
2251 | sizeof(struct dlm_assert_joined), | |
2252 | dlm_assert_joined_handler, | |
d74c9803 | 2253 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
2254 | if (status) |
2255 | goto bail; | |
2256 | ||
2257 | status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
2258 | sizeof(struct dlm_cancel_join), | |
2259 | dlm_cancel_join_handler, | |
d74c9803 | 2260 | NULL, NULL, &dlm_join_handlers); |
ea203441 SM |
2261 | if (status) |
2262 | goto bail; | |
2263 | ||
2264 | status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY, | |
2265 | sizeof(struct dlm_query_region), | |
2266 | dlm_query_region_handler, | |
2267 | NULL, NULL, &dlm_join_handlers); | |
6714d8e8 | 2268 | |
18cfdf1b SM |
2269 | if (status) |
2270 | goto bail; | |
2271 | ||
2272 | status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY, | |
2273 | sizeof(struct dlm_query_nodeinfo), | |
2274 | dlm_query_nodeinfo_handler, | |
2275 | NULL, NULL, &dlm_join_handlers); | |
6714d8e8 KH |
2276 | bail: |
2277 | if (status < 0) | |
2278 | dlm_unregister_net_handlers(); | |
2279 | ||
2280 | return status; | |
2281 | } | |
2282 | ||
2283 | /* Domain eviction callback handling. | |
2284 | * | |
2285 | * The file system requires notification of node death *before* the | |
2286 | * dlm completes it's recovery work, otherwise it may be able to | |
2287 | * acquire locks on resources requiring recovery. Since the dlm can | |
2288 | * evict a node from it's domain *before* heartbeat fires, a similar | |
2289 | * mechanism is required. */ | |
2290 | ||
2291 | /* Eviction is not expected to happen often, so a per-domain lock is | |
2292 | * not necessary. Eviction callbacks are allowed to sleep for short | |
2293 | * periods of time. */ | |
2294 | static DECLARE_RWSEM(dlm_callback_sem); | |
2295 | ||
2296 | void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm, | |
2297 | int node_num) | |
2298 | { | |
6714d8e8 KH |
2299 | struct dlm_eviction_cb *cb; |
2300 | ||
2301 | down_read(&dlm_callback_sem); | |
df53cd3b | 2302 | list_for_each_entry(cb, &dlm->dlm_eviction_callbacks, ec_item) { |
6714d8e8 KH |
2303 | cb->ec_func(node_num, cb->ec_data); |
2304 | } | |
2305 | up_read(&dlm_callback_sem); | |
2306 | } | |
2307 | ||
2308 | void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb, | |
2309 | dlm_eviction_func *f, | |
2310 | void *data) | |
2311 | { | |
2312 | INIT_LIST_HEAD(&cb->ec_item); | |
2313 | cb->ec_func = f; | |
2314 | cb->ec_data = data; | |
2315 | } | |
2316 | EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb); | |
2317 | ||
2318 | void dlm_register_eviction_cb(struct dlm_ctxt *dlm, | |
2319 | struct dlm_eviction_cb *cb) | |
2320 | { | |
2321 | down_write(&dlm_callback_sem); | |
2322 | list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks); | |
2323 | up_write(&dlm_callback_sem); | |
2324 | } | |
2325 | EXPORT_SYMBOL_GPL(dlm_register_eviction_cb); | |
2326 | ||
2327 | void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb) | |
2328 | { | |
2329 | down_write(&dlm_callback_sem); | |
2330 | list_del_init(&cb->ec_item); | |
2331 | up_write(&dlm_callback_sem); | |
2332 | } | |
2333 | EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb); | |
2334 | ||
2335 | static int __init dlm_init(void) | |
2336 | { | |
2337 | int status; | |
2338 | ||
6714d8e8 | 2339 | status = dlm_init_mle_cache(); |
12eb0035 SM |
2340 | if (status) { |
2341 | mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n"); | |
724bdca9 SM |
2342 | goto error; |
2343 | } | |
2344 | ||
2345 | status = dlm_init_master_caches(); | |
2346 | if (status) { | |
2347 | mlog(ML_ERROR, "Could not create o2dlm_lockres and " | |
2348 | "o2dlm_lockname slabcaches\n"); | |
2349 | goto error; | |
2350 | } | |
2351 | ||
2352 | status = dlm_init_lock_cache(); | |
2353 | if (status) { | |
2354 | mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n"); | |
2355 | goto error; | |
12eb0035 | 2356 | } |
6714d8e8 KH |
2357 | |
2358 | status = dlm_register_net_handlers(); | |
2359 | if (status) { | |
724bdca9 SM |
2360 | mlog(ML_ERROR, "Unable to register network handlers\n"); |
2361 | goto error; | |
6714d8e8 KH |
2362 | } |
2363 | ||
6325b4a2 SM |
2364 | status = dlm_create_debugfs_root(); |
2365 | if (status) | |
2366 | goto error; | |
2367 | ||
6714d8e8 | 2368 | return 0; |
724bdca9 | 2369 | error: |
6325b4a2 | 2370 | dlm_unregister_net_handlers(); |
724bdca9 SM |
2371 | dlm_destroy_lock_cache(); |
2372 | dlm_destroy_master_caches(); | |
2373 | dlm_destroy_mle_cache(); | |
2374 | return -1; | |
6714d8e8 KH |
2375 | } |
2376 | ||
2377 | static void __exit dlm_exit (void) | |
2378 | { | |
6325b4a2 | 2379 | dlm_destroy_debugfs_root(); |
6714d8e8 | 2380 | dlm_unregister_net_handlers(); |
724bdca9 SM |
2381 | dlm_destroy_lock_cache(); |
2382 | dlm_destroy_master_caches(); | |
6714d8e8 KH |
2383 | dlm_destroy_mle_cache(); |
2384 | } | |
2385 | ||
2386 | MODULE_AUTHOR("Oracle"); | |
2387 | MODULE_LICENSE("GPL"); | |
ff8fb335 | 2388 | MODULE_DESCRIPTION("OCFS2 Distributed Lock Management"); |
6714d8e8 KH |
2389 | |
2390 | module_init(dlm_init); | |
2391 | module_exit(dlm_exit); |