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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> |
6714d8e8 KH |
36 | |
37 | #include "cluster/heartbeat.h" | |
38 | #include "cluster/nodemanager.h" | |
39 | #include "cluster/tcp.h" | |
40 | ||
41 | #include "dlmapi.h" | |
42 | #include "dlmcommon.h" | |
6714d8e8 | 43 | #include "dlmdomain.h" |
6325b4a2 | 44 | #include "dlmdebug.h" |
6714d8e8 | 45 | |
6714d8e8 KH |
46 | #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN) |
47 | #include "cluster/masklog.h" | |
48 | ||
1faf2894 SE |
49 | /* |
50 | * ocfs2 node maps are array of long int, which limits to send them freely | |
51 | * across the wire due to endianness issues. To workaround this, we convert | |
52 | * long ints to byte arrays. Following 3 routines are helper functions to | |
53 | * set/test/copy bits within those array of bytes | |
54 | */ | |
55 | static inline void byte_set_bit(u8 nr, u8 map[]) | |
56 | { | |
57 | map[nr >> 3] |= (1UL << (nr & 7)); | |
58 | } | |
59 | ||
60 | static inline int byte_test_bit(u8 nr, u8 map[]) | |
61 | { | |
62 | return ((1UL << (nr & 7)) & (map[nr >> 3])) != 0; | |
63 | } | |
64 | ||
65 | static inline void byte_copymap(u8 dmap[], unsigned long smap[], | |
66 | unsigned int sz) | |
67 | { | |
68 | unsigned int nn; | |
69 | ||
70 | if (!sz) | |
71 | return; | |
72 | ||
73 | memset(dmap, 0, ((sz + 7) >> 3)); | |
74 | for (nn = 0 ; nn < sz; nn++) | |
75 | if (test_bit(nn, smap)) | |
76 | byte_set_bit(nn, dmap); | |
77 | } | |
78 | ||
03d864c0 DP |
79 | static void dlm_free_pagevec(void **vec, int pages) |
80 | { | |
81 | while (pages--) | |
82 | free_page((unsigned long)vec[pages]); | |
83 | kfree(vec); | |
84 | } | |
85 | ||
86 | static void **dlm_alloc_pagevec(int pages) | |
87 | { | |
88 | void **vec = kmalloc(pages * sizeof(void *), GFP_KERNEL); | |
89 | int i; | |
90 | ||
91 | if (!vec) | |
92 | return NULL; | |
93 | ||
94 | for (i = 0; i < pages; i++) | |
95 | if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL))) | |
96 | goto out_free; | |
c8f33b6e | 97 | |
685f1adb | 98 | mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n", |
f5a923d1 MF |
99 | pages, (unsigned long)DLM_HASH_PAGES, |
100 | (unsigned long)DLM_BUCKETS_PER_PAGE); | |
03d864c0 DP |
101 | return vec; |
102 | out_free: | |
103 | dlm_free_pagevec(vec, i); | |
104 | return NULL; | |
105 | } | |
106 | ||
6714d8e8 KH |
107 | /* |
108 | * | |
109 | * spinlock lock ordering: if multiple locks are needed, obey this ordering: | |
110 | * dlm_domain_lock | |
111 | * struct dlm_ctxt->spinlock | |
112 | * struct dlm_lock_resource->spinlock | |
113 | * struct dlm_ctxt->master_lock | |
114 | * struct dlm_ctxt->ast_lock | |
115 | * dlm_master_list_entry->spinlock | |
116 | * dlm_lock->spinlock | |
117 | * | |
118 | */ | |
119 | ||
34af946a | 120 | DEFINE_SPINLOCK(dlm_domain_lock); |
6714d8e8 KH |
121 | LIST_HEAD(dlm_domains); |
122 | static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events); | |
123 | ||
d24fbcda JB |
124 | /* |
125 | * The supported protocol version for DLM communication. Running domains | |
126 | * will have a negotiated version with the same major number and a minor | |
127 | * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should | |
128 | * be used to determine what a running domain is actually using. | |
ea203441 SM |
129 | * |
130 | * New in version 1.1: | |
131 | * - Message DLM_QUERY_REGION added to support global heartbeat | |
18cfdf1b | 132 | * - Message DLM_QUERY_NODEINFO added to allow online node removes |
bddefdee SM |
133 | * New in version 1.2: |
134 | * - Message DLM_BEGIN_EXIT_DOMAIN_MSG added to mark start of exit domain | |
d24fbcda JB |
135 | */ |
136 | static const struct dlm_protocol_version dlm_protocol = { | |
137 | .pv_major = 1, | |
bddefdee | 138 | .pv_minor = 2, |
d24fbcda JB |
139 | }; |
140 | ||
6714d8e8 KH |
141 | #define DLM_DOMAIN_BACKOFF_MS 200 |
142 | ||
d74c9803 KH |
143 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
144 | void **ret_data); | |
145 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, | |
146 | void **ret_data); | |
147 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, | |
148 | void **ret_data); | |
ea203441 SM |
149 | static int dlm_query_region_handler(struct o2net_msg *msg, u32 len, |
150 | void *data, void **ret_data); | |
d74c9803 KH |
151 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
152 | void **ret_data); | |
d24fbcda JB |
153 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, |
154 | struct dlm_protocol_version *request); | |
6714d8e8 KH |
155 | |
156 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm); | |
157 | ||
e9f0b6a6 | 158 | void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) |
6714d8e8 | 159 | { |
e9f0b6a6 SM |
160 | if (hlist_unhashed(&res->hash_node)) |
161 | return; | |
162 | ||
163 | mlog(0, "%s: Unhash res %.*s\n", dlm->name, res->lockname.len, | |
164 | res->lockname.name); | |
165 | hlist_del_init(&res->hash_node); | |
166 | dlm_lockres_put(res); | |
6714d8e8 KH |
167 | } |
168 | ||
e9f0b6a6 | 169 | void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) |
6714d8e8 | 170 | { |
81f2094a | 171 | struct hlist_head *bucket; |
6714d8e8 KH |
172 | struct qstr *q; |
173 | ||
174 | assert_spin_locked(&dlm->spinlock); | |
175 | ||
176 | q = &res->lockname; | |
03d864c0 | 177 | bucket = dlm_lockres_hash(dlm, q->hash); |
6714d8e8 KH |
178 | |
179 | /* get a reference for our hashtable */ | |
180 | dlm_lockres_get(res); | |
181 | ||
81f2094a | 182 | hlist_add_head(&res->hash_node, bucket); |
e9f0b6a6 SM |
183 | |
184 | mlog(0, "%s: Hash res %.*s\n", dlm->name, res->lockname.len, | |
185 | res->lockname.name); | |
6714d8e8 KH |
186 | } |
187 | ||
ba2bf218 KH |
188 | struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm, |
189 | const char *name, | |
190 | unsigned int len, | |
191 | unsigned int hash) | |
6714d8e8 | 192 | { |
81f2094a | 193 | struct hlist_head *bucket; |
df53cd3b | 194 | struct dlm_lock_resource *res; |
6714d8e8 | 195 | |
ef6b689b | 196 | mlog(0, "%.*s\n", len, name); |
6714d8e8 KH |
197 | |
198 | assert_spin_locked(&dlm->spinlock); | |
199 | ||
03d864c0 DP |
200 | bucket = dlm_lockres_hash(dlm, hash); |
201 | ||
df53cd3b | 202 | hlist_for_each_entry(res, bucket, hash_node) { |
4198985f DP |
203 | if (res->lockname.name[0] != name[0]) |
204 | continue; | |
205 | if (unlikely(res->lockname.len != len)) | |
206 | continue; | |
207 | if (memcmp(res->lockname.name + 1, name + 1, len - 1)) | |
208 | continue; | |
209 | dlm_lockres_get(res); | |
210 | return res; | |
6714d8e8 | 211 | } |
4198985f | 212 | return NULL; |
6714d8e8 KH |
213 | } |
214 | ||
ba2bf218 KH |
215 | /* intended to be called by functions which do not care about lock |
216 | * resources which are being purged (most net _handler functions). | |
217 | * this will return NULL for any lock resource which is found but | |
218 | * currently in the process of dropping its mastery reference. | |
219 | * use __dlm_lookup_lockres_full when you need the lock resource | |
220 | * regardless (e.g. dlm_get_lock_resource) */ | |
221 | struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, | |
222 | const char *name, | |
223 | unsigned int len, | |
224 | unsigned int hash) | |
225 | { | |
226 | struct dlm_lock_resource *res = NULL; | |
227 | ||
ef6b689b | 228 | mlog(0, "%.*s\n", len, name); |
ba2bf218 KH |
229 | |
230 | assert_spin_locked(&dlm->spinlock); | |
231 | ||
232 | res = __dlm_lookup_lockres_full(dlm, name, len, hash); | |
233 | if (res) { | |
234 | spin_lock(&res->spinlock); | |
235 | if (res->state & DLM_LOCK_RES_DROPPING_REF) { | |
236 | spin_unlock(&res->spinlock); | |
237 | dlm_lockres_put(res); | |
238 | return NULL; | |
239 | } | |
240 | spin_unlock(&res->spinlock); | |
241 | } | |
242 | ||
243 | return res; | |
244 | } | |
245 | ||
6714d8e8 KH |
246 | struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, |
247 | const char *name, | |
248 | unsigned int len) | |
249 | { | |
250 | struct dlm_lock_resource *res; | |
a3d33291 | 251 | unsigned int hash = dlm_lockid_hash(name, len); |
6714d8e8 KH |
252 | |
253 | spin_lock(&dlm->spinlock); | |
a3d33291 | 254 | res = __dlm_lookup_lockres(dlm, name, len, hash); |
6714d8e8 KH |
255 | spin_unlock(&dlm->spinlock); |
256 | return res; | |
257 | } | |
258 | ||
259 | static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len) | |
260 | { | |
df53cd3b | 261 | struct dlm_ctxt *tmp; |
6714d8e8 KH |
262 | |
263 | assert_spin_locked(&dlm_domain_lock); | |
264 | ||
265 | /* tmp->name here is always NULL terminated, | |
266 | * but domain may not be! */ | |
df53cd3b | 267 | list_for_each_entry(tmp, &dlm_domains, list) { |
6714d8e8 KH |
268 | if (strlen(tmp->name) == len && |
269 | memcmp(tmp->name, domain, len)==0) | |
df53cd3b | 270 | return tmp; |
6714d8e8 KH |
271 | } |
272 | ||
df53cd3b | 273 | return NULL; |
6714d8e8 KH |
274 | } |
275 | ||
276 | /* For null terminated domain strings ONLY */ | |
277 | static struct dlm_ctxt * __dlm_lookup_domain(const char *domain) | |
278 | { | |
279 | assert_spin_locked(&dlm_domain_lock); | |
280 | ||
281 | return __dlm_lookup_domain_full(domain, strlen(domain)); | |
282 | } | |
283 | ||
284 | ||
285 | /* returns true on one of two conditions: | |
286 | * 1) the domain does not exist | |
287 | * 2) the domain exists and it's state is "joined" */ | |
288 | static int dlm_wait_on_domain_helper(const char *domain) | |
289 | { | |
290 | int ret = 0; | |
291 | struct dlm_ctxt *tmp = NULL; | |
292 | ||
293 | spin_lock(&dlm_domain_lock); | |
294 | ||
295 | tmp = __dlm_lookup_domain(domain); | |
296 | if (!tmp) | |
297 | ret = 1; | |
298 | else if (tmp->dlm_state == DLM_CTXT_JOINED) | |
299 | ret = 1; | |
300 | ||
301 | spin_unlock(&dlm_domain_lock); | |
302 | return ret; | |
303 | } | |
304 | ||
305 | static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm) | |
306 | { | |
6325b4a2 SM |
307 | dlm_destroy_debugfs_subroot(dlm); |
308 | ||
81f2094a | 309 | if (dlm->lockres_hash) |
03d864c0 | 310 | dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES); |
6714d8e8 | 311 | |
e2b66ddc SM |
312 | if (dlm->master_hash) |
313 | dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES); | |
314 | ||
d787ab09 | 315 | kfree(dlm->name); |
6714d8e8 KH |
316 | kfree(dlm); |
317 | } | |
318 | ||
319 | /* A little strange - this function will be called while holding | |
320 | * dlm_domain_lock and is expected to be holding it on the way out. We | |
321 | * will however drop and reacquire it multiple times */ | |
322 | static void dlm_ctxt_release(struct kref *kref) | |
323 | { | |
324 | struct dlm_ctxt *dlm; | |
325 | ||
326 | dlm = container_of(kref, struct dlm_ctxt, dlm_refs); | |
327 | ||
328 | BUG_ON(dlm->num_joins); | |
329 | BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED); | |
330 | ||
331 | /* we may still be in the list if we hit an error during join. */ | |
332 | list_del_init(&dlm->list); | |
333 | ||
334 | spin_unlock(&dlm_domain_lock); | |
335 | ||
336 | mlog(0, "freeing memory from domain %s\n", dlm->name); | |
337 | ||
338 | wake_up(&dlm_domain_events); | |
339 | ||
340 | dlm_free_ctxt_mem(dlm); | |
341 | ||
342 | spin_lock(&dlm_domain_lock); | |
343 | } | |
344 | ||
345 | void dlm_put(struct dlm_ctxt *dlm) | |
346 | { | |
347 | spin_lock(&dlm_domain_lock); | |
348 | kref_put(&dlm->dlm_refs, dlm_ctxt_release); | |
349 | spin_unlock(&dlm_domain_lock); | |
350 | } | |
351 | ||
352 | static void __dlm_get(struct dlm_ctxt *dlm) | |
353 | { | |
354 | kref_get(&dlm->dlm_refs); | |
355 | } | |
356 | ||
357 | /* given a questionable reference to a dlm object, gets a reference if | |
358 | * it can find it in the list, otherwise returns NULL in which case | |
359 | * you shouldn't trust your pointer. */ | |
360 | struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm) | |
361 | { | |
df53cd3b DF |
362 | struct dlm_ctxt *target; |
363 | struct dlm_ctxt *ret = NULL; | |
6714d8e8 KH |
364 | |
365 | spin_lock(&dlm_domain_lock); | |
366 | ||
df53cd3b | 367 | list_for_each_entry(target, &dlm_domains, list) { |
6714d8e8 KH |
368 | if (target == dlm) { |
369 | __dlm_get(target); | |
df53cd3b | 370 | ret = target; |
6714d8e8 KH |
371 | break; |
372 | } | |
6714d8e8 KH |
373 | } |
374 | ||
375 | spin_unlock(&dlm_domain_lock); | |
376 | ||
df53cd3b | 377 | return ret; |
6714d8e8 KH |
378 | } |
379 | ||
380 | int dlm_domain_fully_joined(struct dlm_ctxt *dlm) | |
381 | { | |
382 | int ret; | |
383 | ||
384 | spin_lock(&dlm_domain_lock); | |
385 | ret = (dlm->dlm_state == DLM_CTXT_JOINED) || | |
386 | (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN); | |
387 | spin_unlock(&dlm_domain_lock); | |
388 | ||
389 | return ret; | |
390 | } | |
391 | ||
3156d267 KH |
392 | static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm) |
393 | { | |
394 | if (dlm->dlm_worker) { | |
395 | flush_workqueue(dlm->dlm_worker); | |
396 | destroy_workqueue(dlm->dlm_worker); | |
397 | dlm->dlm_worker = NULL; | |
398 | } | |
399 | } | |
400 | ||
6714d8e8 KH |
401 | static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm) |
402 | { | |
403 | dlm_unregister_domain_handlers(dlm); | |
007dce53 | 404 | dlm_debug_shutdown(dlm); |
6714d8e8 KH |
405 | dlm_complete_thread(dlm); |
406 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 407 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
408 | |
409 | /* We've left the domain. Now we can take ourselves out of the | |
410 | * list and allow the kref stuff to help us free the | |
411 | * memory. */ | |
412 | spin_lock(&dlm_domain_lock); | |
413 | list_del_init(&dlm->list); | |
414 | spin_unlock(&dlm_domain_lock); | |
415 | ||
416 | /* Wake up anyone waiting for us to remove this domain */ | |
417 | wake_up(&dlm_domain_events); | |
418 | } | |
419 | ||
ba2bf218 | 420 | static int dlm_migrate_all_locks(struct dlm_ctxt *dlm) |
6714d8e8 | 421 | { |
ba2bf218 | 422 | int i, num, n, ret = 0; |
6714d8e8 | 423 | struct dlm_lock_resource *res; |
ba2bf218 KH |
424 | struct hlist_node *iter; |
425 | struct hlist_head *bucket; | |
426 | int dropped; | |
6714d8e8 KH |
427 | |
428 | mlog(0, "Migrating locks from domain %s\n", dlm->name); | |
ba2bf218 KH |
429 | |
430 | num = 0; | |
6714d8e8 | 431 | spin_lock(&dlm->spinlock); |
81f2094a | 432 | for (i = 0; i < DLM_HASH_BUCKETS; i++) { |
ba2bf218 KH |
433 | redo_bucket: |
434 | n = 0; | |
435 | bucket = dlm_lockres_hash(dlm, i); | |
436 | iter = bucket->first; | |
437 | while (iter) { | |
438 | n++; | |
439 | res = hlist_entry(iter, struct dlm_lock_resource, | |
440 | hash_node); | |
6714d8e8 | 441 | dlm_lockres_get(res); |
ba2bf218 KH |
442 | /* migrate, if necessary. this will drop the dlm |
443 | * spinlock and retake it if it does migration. */ | |
444 | dropped = dlm_empty_lockres(dlm, res); | |
445 | ||
446 | spin_lock(&res->spinlock); | |
66effd3c SM |
447 | if (dropped) |
448 | __dlm_lockres_calc_usage(dlm, res); | |
449 | else | |
450 | iter = res->hash_node.next; | |
ba2bf218 KH |
451 | spin_unlock(&res->spinlock); |
452 | ||
6714d8e8 | 453 | dlm_lockres_put(res); |
ba2bf218 | 454 | |
66effd3c SM |
455 | if (dropped) { |
456 | cond_resched_lock(&dlm->spinlock); | |
ba2bf218 | 457 | goto redo_bucket; |
66effd3c | 458 | } |
6714d8e8 | 459 | } |
0d01af6e | 460 | cond_resched_lock(&dlm->spinlock); |
ba2bf218 | 461 | num += n; |
6714d8e8 KH |
462 | } |
463 | spin_unlock(&dlm->spinlock); | |
ba2bf218 KH |
464 | wake_up(&dlm->dlm_thread_wq); |
465 | ||
466 | /* let the dlm thread take care of purging, keep scanning until | |
467 | * nothing remains in the hash */ | |
468 | if (num) { | |
469 | mlog(0, "%s: %d lock resources in hash last pass\n", | |
470 | dlm->name, num); | |
471 | ret = -EAGAIN; | |
472 | } | |
6714d8e8 | 473 | mlog(0, "DONE Migrating locks from domain %s\n", dlm->name); |
ba2bf218 | 474 | return ret; |
6714d8e8 KH |
475 | } |
476 | ||
477 | static int dlm_no_joining_node(struct dlm_ctxt *dlm) | |
478 | { | |
479 | int ret; | |
480 | ||
481 | spin_lock(&dlm->spinlock); | |
482 | ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN; | |
483 | spin_unlock(&dlm->spinlock); | |
484 | ||
485 | return ret; | |
486 | } | |
487 | ||
bddefdee SM |
488 | static int dlm_begin_exit_domain_handler(struct o2net_msg *msg, u32 len, |
489 | void *data, void **ret_data) | |
490 | { | |
491 | struct dlm_ctxt *dlm = data; | |
492 | unsigned int node; | |
493 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; | |
494 | ||
495 | if (!dlm_grab(dlm)) | |
496 | return 0; | |
497 | ||
498 | node = exit_msg->node_idx; | |
499 | mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm->name, node); | |
500 | ||
501 | spin_lock(&dlm->spinlock); | |
502 | set_bit(node, dlm->exit_domain_map); | |
503 | spin_unlock(&dlm->spinlock); | |
504 | ||
505 | dlm_put(dlm); | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
6714d8e8 KH |
510 | static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm) |
511 | { | |
512 | /* Yikes, a double spinlock! I need domain_lock for the dlm | |
513 | * state and the dlm spinlock for join state... Sorry! */ | |
514 | again: | |
515 | spin_lock(&dlm_domain_lock); | |
516 | spin_lock(&dlm->spinlock); | |
517 | ||
518 | if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { | |
519 | mlog(0, "Node %d is joining, we wait on it.\n", | |
520 | dlm->joining_node); | |
521 | spin_unlock(&dlm->spinlock); | |
522 | spin_unlock(&dlm_domain_lock); | |
523 | ||
524 | wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm)); | |
525 | goto again; | |
526 | } | |
527 | ||
528 | dlm->dlm_state = DLM_CTXT_LEAVING; | |
529 | spin_unlock(&dlm->spinlock); | |
530 | spin_unlock(&dlm_domain_lock); | |
531 | } | |
532 | ||
533 | static void __dlm_print_nodes(struct dlm_ctxt *dlm) | |
534 | { | |
8decab3c | 535 | int node = -1, num = 0; |
6714d8e8 KH |
536 | |
537 | assert_spin_locked(&dlm->spinlock); | |
538 | ||
8decab3c | 539 | printk("( "); |
6714d8e8 KH |
540 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, |
541 | node + 1)) < O2NM_MAX_NODES) { | |
781ee3e2 | 542 | printk("%d ", node); |
8decab3c | 543 | ++num; |
6714d8e8 | 544 | } |
8decab3c | 545 | printk(") %u nodes\n", num); |
6714d8e8 KH |
546 | } |
547 | ||
d74c9803 KH |
548 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
549 | void **ret_data) | |
6714d8e8 KH |
550 | { |
551 | struct dlm_ctxt *dlm = data; | |
552 | unsigned int node; | |
553 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; | |
554 | ||
ef6b689b | 555 | mlog(0, "%p %u %p", msg, len, data); |
6714d8e8 KH |
556 | |
557 | if (!dlm_grab(dlm)) | |
558 | return 0; | |
559 | ||
560 | node = exit_msg->node_idx; | |
561 | ||
6714d8e8 KH |
562 | spin_lock(&dlm->spinlock); |
563 | clear_bit(node, dlm->domain_map); | |
bddefdee | 564 | clear_bit(node, dlm->exit_domain_map); |
8decab3c | 565 | printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s ", node, dlm->name); |
6714d8e8 KH |
566 | __dlm_print_nodes(dlm); |
567 | ||
568 | /* notify anything attached to the heartbeat events */ | |
569 | dlm_hb_event_notify_attached(dlm, node, 0); | |
570 | ||
571 | spin_unlock(&dlm->spinlock); | |
572 | ||
573 | dlm_put(dlm); | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
bddefdee | 578 | static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, u32 msg_type, |
6714d8e8 KH |
579 | unsigned int node) |
580 | { | |
581 | int status; | |
582 | struct dlm_exit_domain leave_msg; | |
583 | ||
bddefdee SM |
584 | mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm->name, |
585 | msg_type, node); | |
6714d8e8 KH |
586 | |
587 | memset(&leave_msg, 0, sizeof(leave_msg)); | |
588 | leave_msg.node_idx = dlm->node_num; | |
589 | ||
bddefdee SM |
590 | status = o2net_send_message(msg_type, dlm->key, &leave_msg, |
591 | sizeof(leave_msg), node, NULL); | |
a5196ec5 | 592 | if (status < 0) |
bddefdee SM |
593 | mlog(ML_ERROR, "Error %d sending domain exit message %u " |
594 | "to node %u on domain %s\n", status, msg_type, node, | |
595 | dlm->name); | |
6714d8e8 KH |
596 | |
597 | return status; | |
598 | } | |
599 | ||
bddefdee SM |
600 | static void dlm_begin_exit_domain(struct dlm_ctxt *dlm) |
601 | { | |
602 | int node = -1; | |
603 | ||
604 | /* Support for begin exit domain was added in 1.2 */ | |
605 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
606 | dlm->dlm_locking_proto.pv_minor < 2) | |
607 | return; | |
608 | ||
609 | /* | |
610 | * Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely | |
611 | * informational. Meaning if a node does not receive the message, | |
612 | * so be it. | |
613 | */ | |
614 | spin_lock(&dlm->spinlock); | |
615 | while (1) { | |
616 | node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, node + 1); | |
617 | if (node >= O2NM_MAX_NODES) | |
618 | break; | |
619 | if (node == dlm->node_num) | |
620 | continue; | |
621 | ||
622 | spin_unlock(&dlm->spinlock); | |
623 | dlm_send_one_domain_exit(dlm, DLM_BEGIN_EXIT_DOMAIN_MSG, node); | |
624 | spin_lock(&dlm->spinlock); | |
625 | } | |
626 | spin_unlock(&dlm->spinlock); | |
627 | } | |
6714d8e8 KH |
628 | |
629 | static void dlm_leave_domain(struct dlm_ctxt *dlm) | |
630 | { | |
631 | int node, clear_node, status; | |
632 | ||
633 | /* At this point we've migrated away all our locks and won't | |
634 | * accept mastership of new ones. The dlm is responsible for | |
635 | * almost nothing now. We make sure not to confuse any joining | |
636 | * nodes and then commence shutdown procedure. */ | |
637 | ||
638 | spin_lock(&dlm->spinlock); | |
639 | /* Clear ourselves from the domain map */ | |
640 | clear_bit(dlm->node_num, dlm->domain_map); | |
641 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, | |
642 | 0)) < O2NM_MAX_NODES) { | |
643 | /* Drop the dlm spinlock. This is safe wrt the domain_map. | |
644 | * -nodes cannot be added now as the | |
645 | * query_join_handlers knows to respond with OK_NO_MAP | |
646 | * -we catch the right network errors if a node is | |
647 | * removed from the map while we're sending him the | |
648 | * exit message. */ | |
649 | spin_unlock(&dlm->spinlock); | |
650 | ||
651 | clear_node = 1; | |
652 | ||
bddefdee SM |
653 | status = dlm_send_one_domain_exit(dlm, DLM_EXIT_DOMAIN_MSG, |
654 | node); | |
6714d8e8 KH |
655 | if (status < 0 && |
656 | status != -ENOPROTOOPT && | |
657 | status != -ENOTCONN) { | |
658 | mlog(ML_NOTICE, "Error %d sending domain exit message " | |
659 | "to node %d\n", status, node); | |
660 | ||
661 | /* Not sure what to do here but lets sleep for | |
662 | * a bit in case this was a transient | |
663 | * error... */ | |
664 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
665 | clear_node = 0; | |
666 | } | |
667 | ||
668 | spin_lock(&dlm->spinlock); | |
669 | /* If we're not clearing the node bit then we intend | |
670 | * to loop back around to try again. */ | |
671 | if (clear_node) | |
672 | clear_bit(node, dlm->domain_map); | |
673 | } | |
674 | spin_unlock(&dlm->spinlock); | |
675 | } | |
676 | ||
6714d8e8 KH |
677 | int dlm_shutting_down(struct dlm_ctxt *dlm) |
678 | { | |
679 | int ret = 0; | |
680 | ||
681 | spin_lock(&dlm_domain_lock); | |
682 | ||
683 | if (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN) | |
684 | ret = 1; | |
685 | ||
686 | spin_unlock(&dlm_domain_lock); | |
687 | ||
688 | return ret; | |
689 | } | |
690 | ||
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; | |
1399 | unsigned int node; | |
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; | |
0f71b7b4 JB |
1468 | } else if (packet.code == JOIN_DISALLOW || |
1469 | packet.code == JOIN_OK_NO_MAP) { | |
1470 | *response = packet.code; | |
1471 | } else if (packet.code == JOIN_PROTOCOL_MISMATCH) { | |
d24fbcda JB |
1472 | mlog(ML_NOTICE, |
1473 | "This node requested DLM locking protocol %u.%u and " | |
1474 | "filesystem locking protocol %u.%u. At least one of " | |
1475 | "the protocol versions on node %d is not compatible, " | |
1476 | "disconnecting\n", | |
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 | node); | |
1482 | status = -EPROTO; | |
0f71b7b4 JB |
1483 | *response = packet.code; |
1484 | } else if (packet.code == JOIN_OK) { | |
1485 | *response = packet.code; | |
d24fbcda | 1486 | /* Use the same locking protocol as the remote node */ |
0f71b7b4 JB |
1487 | dlm->dlm_locking_proto.pv_minor = packet.dlm_minor; |
1488 | dlm->fs_locking_proto.pv_minor = packet.fs_minor; | |
d24fbcda JB |
1489 | mlog(0, |
1490 | "Node %d responds JOIN_OK with DLM locking protocol " | |
1491 | "%u.%u and fs locking protocol %u.%u\n", | |
1492 | node, | |
1493 | dlm->dlm_locking_proto.pv_major, | |
1494 | dlm->dlm_locking_proto.pv_minor, | |
1495 | dlm->fs_locking_proto.pv_major, | |
1496 | dlm->fs_locking_proto.pv_minor); | |
6714d8e8 KH |
1497 | } else { |
1498 | status = -EINVAL; | |
d24fbcda | 1499 | mlog(ML_ERROR, "invalid response %d from node %u\n", |
0f71b7b4 | 1500 | packet.code, node); |
6714d8e8 KH |
1501 | } |
1502 | ||
1503 | mlog(0, "status %d, node %d response is %d\n", status, node, | |
0f71b7b4 | 1504 | *response); |
6714d8e8 KH |
1505 | |
1506 | bail: | |
1507 | return status; | |
1508 | } | |
1509 | ||
1510 | static int dlm_send_one_join_assert(struct dlm_ctxt *dlm, | |
1511 | unsigned int node) | |
1512 | { | |
1513 | int status; | |
01c6222f | 1514 | int ret; |
6714d8e8 KH |
1515 | struct dlm_assert_joined assert_msg; |
1516 | ||
1517 | mlog(0, "Sending join assert to node %u\n", node); | |
1518 | ||
1519 | memset(&assert_msg, 0, sizeof(assert_msg)); | |
1520 | assert_msg.node_idx = dlm->node_num; | |
1521 | assert_msg.name_len = strlen(dlm->name); | |
1522 | memcpy(assert_msg.domain, dlm->name, assert_msg.name_len); | |
1523 | ||
1524 | status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1525 | &assert_msg, sizeof(assert_msg), node, | |
01c6222f | 1526 | &ret); |
6714d8e8 | 1527 | if (status < 0) |
a5196ec5 WW |
1528 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1529 | "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1530 | node); | |
01c6222f X |
1531 | else |
1532 | status = ret; | |
6714d8e8 KH |
1533 | |
1534 | return status; | |
1535 | } | |
1536 | ||
1537 | static void dlm_send_join_asserts(struct dlm_ctxt *dlm, | |
1538 | unsigned long *node_map) | |
1539 | { | |
1540 | int status, node, live; | |
1541 | ||
1542 | status = 0; | |
1543 | node = -1; | |
1544 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, | |
1545 | node + 1)) < O2NM_MAX_NODES) { | |
1546 | if (node == dlm->node_num) | |
1547 | continue; | |
1548 | ||
1549 | do { | |
1550 | /* It is very important that this message be | |
1551 | * received so we spin until either the node | |
1552 | * has died or it gets the message. */ | |
1553 | status = dlm_send_one_join_assert(dlm, node); | |
1554 | ||
1555 | spin_lock(&dlm->spinlock); | |
1556 | live = test_bit(node, dlm->live_nodes_map); | |
1557 | spin_unlock(&dlm->spinlock); | |
1558 | ||
1559 | if (status) { | |
1560 | mlog(ML_ERROR, "Error return %d asserting " | |
1561 | "join on node %d\n", status, node); | |
1562 | ||
1563 | /* give us some time between errors... */ | |
1564 | if (live) | |
1565 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
1566 | } | |
1567 | } while (status && live); | |
1568 | } | |
1569 | } | |
1570 | ||
1571 | struct domain_join_ctxt { | |
1572 | unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1573 | unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1574 | }; | |
1575 | ||
1576 | static int dlm_should_restart_join(struct dlm_ctxt *dlm, | |
1577 | struct domain_join_ctxt *ctxt, | |
d24fbcda | 1578 | enum dlm_query_join_response_code response) |
6714d8e8 KH |
1579 | { |
1580 | int ret; | |
1581 | ||
1582 | if (response == JOIN_DISALLOW) { | |
1583 | mlog(0, "Latest response of disallow -- should restart\n"); | |
1584 | return 1; | |
1585 | } | |
1586 | ||
1587 | spin_lock(&dlm->spinlock); | |
1588 | /* For now, we restart the process if the node maps have | |
1589 | * changed at all */ | |
1590 | ret = memcmp(ctxt->live_map, dlm->live_nodes_map, | |
1591 | sizeof(dlm->live_nodes_map)); | |
1592 | spin_unlock(&dlm->spinlock); | |
1593 | ||
1594 | if (ret) | |
1595 | mlog(0, "Node maps changed -- should restart\n"); | |
1596 | ||
1597 | return ret; | |
1598 | } | |
1599 | ||
1600 | static int dlm_try_to_join_domain(struct dlm_ctxt *dlm) | |
1601 | { | |
1602 | int status = 0, tmpstat, node; | |
1603 | struct domain_join_ctxt *ctxt; | |
d24fbcda | 1604 | enum dlm_query_join_response_code response = JOIN_DISALLOW; |
6714d8e8 | 1605 | |
ef6b689b | 1606 | mlog(0, "%p", dlm); |
6714d8e8 | 1607 | |
cd861280 | 1608 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); |
6714d8e8 KH |
1609 | if (!ctxt) { |
1610 | status = -ENOMEM; | |
1611 | mlog_errno(status); | |
1612 | goto bail; | |
1613 | } | |
1614 | ||
1615 | /* group sem locking should work for us here -- we're already | |
1616 | * registered for heartbeat events so filling this should be | |
1617 | * atomic wrt getting those handlers called. */ | |
1618 | o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map)); | |
1619 | ||
1620 | spin_lock(&dlm->spinlock); | |
1621 | memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map)); | |
1622 | ||
1623 | __dlm_set_joining_node(dlm, dlm->node_num); | |
1624 | ||
1625 | spin_unlock(&dlm->spinlock); | |
1626 | ||
1627 | node = -1; | |
1628 | while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES, | |
1629 | node + 1)) < O2NM_MAX_NODES) { | |
1630 | if (node == dlm->node_num) | |
1631 | continue; | |
1632 | ||
1633 | status = dlm_request_join(dlm, node, &response); | |
1634 | if (status < 0) { | |
1635 | mlog_errno(status); | |
1636 | goto bail; | |
1637 | } | |
1638 | ||
1639 | /* Ok, either we got a response or the node doesn't have a | |
1640 | * dlm up. */ | |
1641 | if (response == JOIN_OK) | |
1642 | set_bit(node, ctxt->yes_resp_map); | |
1643 | ||
1644 | if (dlm_should_restart_join(dlm, ctxt, response)) { | |
1645 | status = -EAGAIN; | |
1646 | goto bail; | |
1647 | } | |
1648 | } | |
1649 | ||
1650 | mlog(0, "Yay, done querying nodes!\n"); | |
1651 | ||
1652 | /* Yay, everyone agree's we can join the domain. My domain is | |
1653 | * comprised of all nodes who were put in the | |
1654 | * yes_resp_map. Copy that into our domain map and send a join | |
1655 | * assert message to clean up everyone elses state. */ | |
1656 | spin_lock(&dlm->spinlock); | |
1657 | memcpy(dlm->domain_map, ctxt->yes_resp_map, | |
1658 | sizeof(ctxt->yes_resp_map)); | |
1659 | set_bit(dlm->node_num, dlm->domain_map); | |
1660 | spin_unlock(&dlm->spinlock); | |
1661 | ||
18cfdf1b | 1662 | /* Support for global heartbeat and node info was added in 1.1 */ |
4da6dc29 SM |
1663 | if (dlm->dlm_locking_proto.pv_major > 1 || |
1664 | dlm->dlm_locking_proto.pv_minor > 0) { | |
18cfdf1b SM |
1665 | status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map); |
1666 | if (status) { | |
1667 | mlog_errno(status); | |
1668 | goto bail; | |
1669 | } | |
ea203441 SM |
1670 | status = dlm_send_regions(dlm, ctxt->yes_resp_map); |
1671 | if (status) { | |
1672 | mlog_errno(status); | |
1673 | goto bail; | |
1674 | } | |
1675 | } | |
1676 | ||
6714d8e8 KH |
1677 | dlm_send_join_asserts(dlm, ctxt->yes_resp_map); |
1678 | ||
1679 | /* Joined state *must* be set before the joining node | |
1680 | * information, otherwise the query_join handler may read no | |
1681 | * current joiner but a state of NEW and tell joining nodes | |
1682 | * we're not in the domain. */ | |
1683 | spin_lock(&dlm_domain_lock); | |
1684 | dlm->dlm_state = DLM_CTXT_JOINED; | |
1685 | dlm->num_joins++; | |
1686 | spin_unlock(&dlm_domain_lock); | |
1687 | ||
1688 | bail: | |
1689 | spin_lock(&dlm->spinlock); | |
1690 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
8decab3c SM |
1691 | if (!status) { |
1692 | printk(KERN_NOTICE "o2dlm: Joining domain %s ", dlm->name); | |
6714d8e8 | 1693 | __dlm_print_nodes(dlm); |
8decab3c | 1694 | } |
6714d8e8 KH |
1695 | spin_unlock(&dlm->spinlock); |
1696 | ||
1697 | if (ctxt) { | |
1698 | /* Do we need to send a cancel message to any nodes? */ | |
1699 | if (status < 0) { | |
1700 | tmpstat = dlm_send_join_cancels(dlm, | |
1701 | ctxt->yes_resp_map, | |
1702 | sizeof(ctxt->yes_resp_map)); | |
1703 | if (tmpstat < 0) | |
1704 | mlog_errno(tmpstat); | |
1705 | } | |
1706 | kfree(ctxt); | |
1707 | } | |
1708 | ||
1709 | mlog(0, "returning %d\n", status); | |
1710 | return status; | |
1711 | } | |
1712 | ||
1713 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm) | |
1714 | { | |
58a3158a SM |
1715 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up); |
1716 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down); | |
6714d8e8 KH |
1717 | o2net_unregister_handler_list(&dlm->dlm_domain_handlers); |
1718 | } | |
1719 | ||
1720 | static int dlm_register_domain_handlers(struct dlm_ctxt *dlm) | |
1721 | { | |
1722 | int status; | |
1723 | ||
1724 | mlog(0, "registering handlers.\n"); | |
1725 | ||
1726 | o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB, | |
1727 | dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI); | |
cdd09f49 JQ |
1728 | o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB, |
1729 | dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI); | |
1730 | ||
58a3158a | 1731 | status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down); |
6714d8e8 KH |
1732 | if (status) |
1733 | goto bail; | |
1734 | ||
58a3158a | 1735 | status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up); |
6714d8e8 KH |
1736 | if (status) |
1737 | goto bail; | |
1738 | ||
1739 | status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key, | |
1740 | sizeof(struct dlm_master_request), | |
1741 | dlm_master_request_handler, | |
d74c9803 | 1742 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1743 | if (status) |
1744 | goto bail; | |
1745 | ||
1746 | status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key, | |
1747 | sizeof(struct dlm_assert_master), | |
1748 | dlm_assert_master_handler, | |
3b8118cf KH |
1749 | dlm, dlm_assert_master_post_handler, |
1750 | &dlm->dlm_domain_handlers); | |
6714d8e8 KH |
1751 | if (status) |
1752 | goto bail; | |
1753 | ||
1754 | status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key, | |
1755 | sizeof(struct dlm_create_lock), | |
1756 | dlm_create_lock_handler, | |
d74c9803 | 1757 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1758 | if (status) |
1759 | goto bail; | |
1760 | ||
1761 | status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key, | |
1762 | DLM_CONVERT_LOCK_MAX_LEN, | |
1763 | dlm_convert_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_UNLOCK_LOCK_MSG, dlm->key, | |
1769 | DLM_UNLOCK_LOCK_MAX_LEN, | |
1770 | dlm_unlock_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_PROXY_AST_MSG, dlm->key, | |
1776 | DLM_PROXY_AST_MAX_LEN, | |
1777 | dlm_proxy_ast_handler, | |
d74c9803 | 1778 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1779 | if (status) |
1780 | goto bail; | |
1781 | ||
1782 | status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key, | |
1783 | sizeof(struct dlm_exit_domain), | |
1784 | dlm_exit_domain_handler, | |
d74c9803 | 1785 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1786 | if (status) |
1787 | goto bail; | |
1788 | ||
ba2bf218 KH |
1789 | status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key, |
1790 | sizeof(struct dlm_deref_lockres), | |
1791 | dlm_deref_lockres_handler, | |
d74c9803 | 1792 | dlm, NULL, &dlm->dlm_domain_handlers); |
ba2bf218 KH |
1793 | if (status) |
1794 | goto bail; | |
1795 | ||
6714d8e8 KH |
1796 | status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key, |
1797 | sizeof(struct dlm_migrate_request), | |
1798 | dlm_migrate_request_handler, | |
d74c9803 | 1799 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1800 | if (status) |
1801 | goto bail; | |
1802 | ||
1803 | status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key, | |
1804 | DLM_MIG_LOCKRES_MAX_LEN, | |
1805 | dlm_mig_lockres_handler, | |
d74c9803 | 1806 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1807 | if (status) |
1808 | goto bail; | |
1809 | ||
1810 | status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key, | |
1811 | sizeof(struct dlm_master_requery), | |
1812 | dlm_master_requery_handler, | |
d74c9803 | 1813 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1814 | if (status) |
1815 | goto bail; | |
1816 | ||
1817 | status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key, | |
1818 | sizeof(struct dlm_lock_request), | |
1819 | dlm_request_all_locks_handler, | |
d74c9803 | 1820 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1821 | if (status) |
1822 | goto bail; | |
1823 | ||
1824 | status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key, | |
1825 | sizeof(struct dlm_reco_data_done), | |
1826 | dlm_reco_data_done_handler, | |
d74c9803 | 1827 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1828 | if (status) |
1829 | goto bail; | |
1830 | ||
1831 | status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key, | |
1832 | sizeof(struct dlm_begin_reco), | |
1833 | dlm_begin_reco_handler, | |
d74c9803 | 1834 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1835 | if (status) |
1836 | goto bail; | |
1837 | ||
1838 | status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key, | |
1839 | sizeof(struct dlm_finalize_reco), | |
1840 | dlm_finalize_reco_handler, | |
d74c9803 | 1841 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1842 | if (status) |
1843 | goto bail; | |
1844 | ||
bddefdee SM |
1845 | status = o2net_register_handler(DLM_BEGIN_EXIT_DOMAIN_MSG, dlm->key, |
1846 | sizeof(struct dlm_exit_domain), | |
1847 | dlm_begin_exit_domain_handler, | |
1848 | dlm, NULL, &dlm->dlm_domain_handlers); | |
1849 | if (status) | |
1850 | goto bail; | |
1851 | ||
6714d8e8 KH |
1852 | bail: |
1853 | if (status) | |
1854 | dlm_unregister_domain_handlers(dlm); | |
1855 | ||
1856 | return status; | |
1857 | } | |
1858 | ||
1859 | static int dlm_join_domain(struct dlm_ctxt *dlm) | |
1860 | { | |
1861 | int status; | |
0dd82141 SM |
1862 | unsigned int backoff; |
1863 | unsigned int total_backoff = 0; | |
6714d8e8 KH |
1864 | |
1865 | BUG_ON(!dlm); | |
1866 | ||
1867 | mlog(0, "Join domain %s\n", dlm->name); | |
1868 | ||
1869 | status = dlm_register_domain_handlers(dlm); | |
1870 | if (status) { | |
1871 | mlog_errno(status); | |
1872 | goto bail; | |
1873 | } | |
1874 | ||
181a9a04 | 1875 | status = dlm_launch_thread(dlm); |
007dce53 SM |
1876 | if (status < 0) { |
1877 | mlog_errno(status); | |
1878 | goto bail; | |
1879 | } | |
1880 | ||
181a9a04 | 1881 | status = dlm_launch_recovery_thread(dlm); |
6714d8e8 KH |
1882 | if (status < 0) { |
1883 | mlog_errno(status); | |
1884 | goto bail; | |
1885 | } | |
1886 | ||
181a9a04 | 1887 | status = dlm_debug_init(dlm); |
6714d8e8 KH |
1888 | if (status < 0) { |
1889 | mlog_errno(status); | |
1890 | goto bail; | |
1891 | } | |
1892 | ||
3156d267 KH |
1893 | dlm->dlm_worker = create_singlethread_workqueue("dlm_wq"); |
1894 | if (!dlm->dlm_worker) { | |
1895 | status = -ENOMEM; | |
1896 | mlog_errno(status); | |
1897 | goto bail; | |
1898 | } | |
1899 | ||
6714d8e8 | 1900 | do { |
6714d8e8 KH |
1901 | status = dlm_try_to_join_domain(dlm); |
1902 | ||
1903 | /* If we're racing another node to the join, then we | |
1904 | * need to back off temporarily and let them | |
1905 | * complete. */ | |
0dd82141 | 1906 | #define DLM_JOIN_TIMEOUT_MSECS 90000 |
6714d8e8 KH |
1907 | if (status == -EAGAIN) { |
1908 | if (signal_pending(current)) { | |
1909 | status = -ERESTARTSYS; | |
1910 | goto bail; | |
1911 | } | |
1912 | ||
7567c148 | 1913 | if (total_backoff > DLM_JOIN_TIMEOUT_MSECS) { |
0dd82141 SM |
1914 | status = -ERESTARTSYS; |
1915 | mlog(ML_NOTICE, "Timed out joining dlm domain " | |
1916 | "%s after %u msecs\n", dlm->name, | |
7567c148 | 1917 | total_backoff); |
0dd82141 SM |
1918 | goto bail; |
1919 | } | |
1920 | ||
6714d8e8 KH |
1921 | /* |
1922 | * <chip> After you! | |
1923 | * <dale> No, after you! | |
1924 | * <chip> I insist! | |
1925 | * <dale> But you first! | |
1926 | * ... | |
1927 | */ | |
1928 | backoff = (unsigned int)(jiffies & 0x3); | |
1929 | backoff *= DLM_DOMAIN_BACKOFF_MS; | |
0dd82141 | 1930 | total_backoff += backoff; |
6714d8e8 KH |
1931 | mlog(0, "backoff %d\n", backoff); |
1932 | msleep(backoff); | |
1933 | } | |
1934 | } while (status == -EAGAIN); | |
1935 | ||
1936 | if (status < 0) { | |
1937 | mlog_errno(status); | |
1938 | goto bail; | |
1939 | } | |
1940 | ||
1941 | status = 0; | |
1942 | bail: | |
1943 | wake_up(&dlm_domain_events); | |
1944 | ||
1945 | if (status) { | |
1946 | dlm_unregister_domain_handlers(dlm); | |
007dce53 | 1947 | dlm_debug_shutdown(dlm); |
6714d8e8 KH |
1948 | dlm_complete_thread(dlm); |
1949 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 1950 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
1951 | } |
1952 | ||
1953 | return status; | |
1954 | } | |
1955 | ||
1956 | static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain, | |
1957 | u32 key) | |
1958 | { | |
1959 | int i; | |
6325b4a2 | 1960 | int ret; |
6714d8e8 KH |
1961 | struct dlm_ctxt *dlm = NULL; |
1962 | ||
cd861280 | 1963 | dlm = kzalloc(sizeof(*dlm), GFP_KERNEL); |
6714d8e8 | 1964 | if (!dlm) { |
190a7721 JQ |
1965 | ret = -ENOMEM; |
1966 | mlog_errno(ret); | |
6714d8e8 KH |
1967 | goto leave; |
1968 | } | |
1969 | ||
316ce2ba | 1970 | dlm->name = kstrdup(domain, GFP_KERNEL); |
6714d8e8 | 1971 | if (dlm->name == NULL) { |
190a7721 JQ |
1972 | ret = -ENOMEM; |
1973 | mlog_errno(ret); | |
6714d8e8 KH |
1974 | goto leave; |
1975 | } | |
1976 | ||
03d864c0 | 1977 | dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES); |
81f2094a | 1978 | if (!dlm->lockres_hash) { |
190a7721 JQ |
1979 | ret = -ENOMEM; |
1980 | mlog_errno(ret); | |
6714d8e8 KH |
1981 | goto leave; |
1982 | } | |
6714d8e8 | 1983 | |
03d864c0 DP |
1984 | for (i = 0; i < DLM_HASH_BUCKETS; i++) |
1985 | INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i)); | |
6714d8e8 | 1986 | |
e2b66ddc SM |
1987 | dlm->master_hash = (struct hlist_head **) |
1988 | dlm_alloc_pagevec(DLM_HASH_PAGES); | |
1989 | if (!dlm->master_hash) { | |
190a7721 JQ |
1990 | ret = -ENOMEM; |
1991 | mlog_errno(ret); | |
e2b66ddc SM |
1992 | goto leave; |
1993 | } | |
1994 | ||
1995 | for (i = 0; i < DLM_HASH_BUCKETS; i++) | |
1996 | INIT_HLIST_HEAD(dlm_master_hash(dlm, i)); | |
1997 | ||
6714d8e8 KH |
1998 | dlm->key = key; |
1999 | dlm->node_num = o2nm_this_node(); | |
2000 | ||
6325b4a2 | 2001 | ret = dlm_create_debugfs_subroot(dlm); |
190a7721 | 2002 | if (ret < 0) |
6325b4a2 | 2003 | goto leave; |
6325b4a2 | 2004 | |
6714d8e8 KH |
2005 | spin_lock_init(&dlm->spinlock); |
2006 | spin_lock_init(&dlm->master_lock); | |
2007 | spin_lock_init(&dlm->ast_lock); | |
b0d4f817 | 2008 | spin_lock_init(&dlm->track_lock); |
6714d8e8 KH |
2009 | INIT_LIST_HEAD(&dlm->list); |
2010 | INIT_LIST_HEAD(&dlm->dirty_list); | |
2011 | INIT_LIST_HEAD(&dlm->reco.resources); | |
6714d8e8 KH |
2012 | INIT_LIST_HEAD(&dlm->reco.node_data); |
2013 | INIT_LIST_HEAD(&dlm->purge_list); | |
2014 | INIT_LIST_HEAD(&dlm->dlm_domain_handlers); | |
29576f8b | 2015 | INIT_LIST_HEAD(&dlm->tracking_list); |
6714d8e8 KH |
2016 | dlm->reco.state = 0; |
2017 | ||
2018 | INIT_LIST_HEAD(&dlm->pending_asts); | |
2019 | INIT_LIST_HEAD(&dlm->pending_basts); | |
2020 | ||
2021 | mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n", | |
2022 | dlm->recovery_map, &(dlm->recovery_map[0])); | |
2023 | ||
2024 | memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map)); | |
2025 | memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map)); | |
2026 | memset(dlm->domain_map, 0, sizeof(dlm->domain_map)); | |
2027 | ||
2028 | dlm->dlm_thread_task = NULL; | |
2029 | dlm->dlm_reco_thread_task = NULL; | |
3156d267 | 2030 | dlm->dlm_worker = NULL; |
6714d8e8 KH |
2031 | init_waitqueue_head(&dlm->dlm_thread_wq); |
2032 | init_waitqueue_head(&dlm->dlm_reco_thread_wq); | |
2033 | init_waitqueue_head(&dlm->reco.event); | |
2034 | init_waitqueue_head(&dlm->ast_wq); | |
2035 | init_waitqueue_head(&dlm->migration_wq); | |
6714d8e8 KH |
2036 | INIT_LIST_HEAD(&dlm->mle_hb_events); |
2037 | ||
2038 | dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN; | |
2039 | init_waitqueue_head(&dlm->dlm_join_events); | |
2040 | ||
2041 | dlm->reco.new_master = O2NM_INVALID_NODE_NUM; | |
2042 | dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; | |
6714d8e8 | 2043 | |
6800791a SM |
2044 | atomic_set(&dlm->res_tot_count, 0); |
2045 | atomic_set(&dlm->res_cur_count, 0); | |
2041d8fd SM |
2046 | for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) { |
2047 | atomic_set(&dlm->mle_tot_count[i], 0); | |
2048 | atomic_set(&dlm->mle_cur_count[i], 0); | |
2049 | } | |
2050 | ||
6714d8e8 KH |
2051 | spin_lock_init(&dlm->work_lock); |
2052 | INIT_LIST_HEAD(&dlm->work_list); | |
c4028958 | 2053 | INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work); |
6714d8e8 KH |
2054 | |
2055 | kref_init(&dlm->dlm_refs); | |
2056 | dlm->dlm_state = DLM_CTXT_NEW; | |
2057 | ||
2058 | INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks); | |
2059 | ||
2060 | mlog(0, "context init: refcount %u\n", | |
2061 | atomic_read(&dlm->dlm_refs.refcount)); | |
2062 | ||
2063 | leave: | |
190a7721 JQ |
2064 | if (ret < 0 && dlm) { |
2065 | if (dlm->master_hash) | |
2066 | dlm_free_pagevec((void **)dlm->master_hash, | |
2067 | DLM_HASH_PAGES); | |
2068 | ||
2069 | if (dlm->lockres_hash) | |
2070 | dlm_free_pagevec((void **)dlm->lockres_hash, | |
2071 | DLM_HASH_PAGES); | |
2072 | ||
2073 | kfree(dlm->name); | |
2074 | kfree(dlm); | |
2075 | dlm = NULL; | |
2076 | } | |
6714d8e8 KH |
2077 | return dlm; |
2078 | } | |
2079 | ||
2080 | /* | |
d24fbcda JB |
2081 | * Compare a requested locking protocol version against the current one. |
2082 | * | |
2083 | * If the major numbers are different, they are incompatible. | |
2084 | * If the current minor is greater than the request, they are incompatible. | |
2085 | * If the current minor is less than or equal to the request, they are | |
2086 | * compatible, and the requester should run at the current minor version. | |
2087 | */ | |
2088 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, | |
2089 | struct dlm_protocol_version *request) | |
2090 | { | |
2091 | if (existing->pv_major != request->pv_major) | |
2092 | return 1; | |
2093 | ||
2094 | if (existing->pv_minor > request->pv_minor) | |
2095 | return 1; | |
2096 | ||
2097 | if (existing->pv_minor < request->pv_minor) | |
2098 | request->pv_minor = existing->pv_minor; | |
2099 | ||
2100 | return 0; | |
2101 | } | |
2102 | ||
2103 | /* | |
2104 | * dlm_register_domain: one-time setup per "domain". | |
2105 | * | |
2106 | * The filesystem passes in the requested locking version via proto. | |
2107 | * If registration was successful, proto will contain the negotiated | |
2108 | * locking protocol. | |
6714d8e8 KH |
2109 | */ |
2110 | struct dlm_ctxt * dlm_register_domain(const char *domain, | |
d24fbcda JB |
2111 | u32 key, |
2112 | struct dlm_protocol_version *fs_proto) | |
6714d8e8 KH |
2113 | { |
2114 | int ret; | |
2115 | struct dlm_ctxt *dlm = NULL; | |
2116 | struct dlm_ctxt *new_ctxt = NULL; | |
2117 | ||
e372357b | 2118 | if (strlen(domain) >= O2NM_MAX_NAME_LEN) { |
6714d8e8 KH |
2119 | ret = -ENAMETOOLONG; |
2120 | mlog(ML_ERROR, "domain name length too long\n"); | |
2121 | goto leave; | |
2122 | } | |
2123 | ||
6714d8e8 KH |
2124 | mlog(0, "register called for domain \"%s\"\n", domain); |
2125 | ||
2126 | retry: | |
2127 | dlm = NULL; | |
2128 | if (signal_pending(current)) { | |
2129 | ret = -ERESTARTSYS; | |
2130 | mlog_errno(ret); | |
2131 | goto leave; | |
2132 | } | |
2133 | ||
2134 | spin_lock(&dlm_domain_lock); | |
2135 | ||
2136 | dlm = __dlm_lookup_domain(domain); | |
2137 | if (dlm) { | |
2138 | if (dlm->dlm_state != DLM_CTXT_JOINED) { | |
2139 | spin_unlock(&dlm_domain_lock); | |
2140 | ||
2141 | mlog(0, "This ctxt is not joined yet!\n"); | |
2142 | wait_event_interruptible(dlm_domain_events, | |
2143 | dlm_wait_on_domain_helper( | |
2144 | domain)); | |
2145 | goto retry; | |
2146 | } | |
2147 | ||
d24fbcda | 2148 | if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) { |
6469272c | 2149 | spin_unlock(&dlm_domain_lock); |
d24fbcda JB |
2150 | mlog(ML_ERROR, |
2151 | "Requested locking protocol version is not " | |
2152 | "compatible with already registered domain " | |
2153 | "\"%s\"\n", domain); | |
2154 | ret = -EPROTO; | |
2155 | goto leave; | |
2156 | } | |
2157 | ||
6714d8e8 KH |
2158 | __dlm_get(dlm); |
2159 | dlm->num_joins++; | |
2160 | ||
2161 | spin_unlock(&dlm_domain_lock); | |
2162 | ||
2163 | ret = 0; | |
2164 | goto leave; | |
2165 | } | |
2166 | ||
2167 | /* doesn't exist */ | |
2168 | if (!new_ctxt) { | |
2169 | spin_unlock(&dlm_domain_lock); | |
2170 | ||
2171 | new_ctxt = dlm_alloc_ctxt(domain, key); | |
2172 | if (new_ctxt) | |
2173 | goto retry; | |
2174 | ||
2175 | ret = -ENOMEM; | |
2176 | mlog_errno(ret); | |
2177 | goto leave; | |
2178 | } | |
2179 | ||
2180 | /* a little variable switch-a-roo here... */ | |
2181 | dlm = new_ctxt; | |
2182 | new_ctxt = NULL; | |
2183 | ||
2184 | /* add the new domain */ | |
2185 | list_add_tail(&dlm->list, &dlm_domains); | |
2186 | spin_unlock(&dlm_domain_lock); | |
2187 | ||
d24fbcda JB |
2188 | /* |
2189 | * Pass the locking protocol version into the join. If the join | |
2190 | * succeeds, it will have the negotiated protocol set. | |
2191 | */ | |
2192 | dlm->dlm_locking_proto = dlm_protocol; | |
2193 | dlm->fs_locking_proto = *fs_proto; | |
2194 | ||
6714d8e8 KH |
2195 | ret = dlm_join_domain(dlm); |
2196 | if (ret) { | |
2197 | mlog_errno(ret); | |
2198 | dlm_put(dlm); | |
2199 | goto leave; | |
2200 | } | |
2201 | ||
d24fbcda JB |
2202 | /* Tell the caller what locking protocol we negotiated */ |
2203 | *fs_proto = dlm->fs_locking_proto; | |
2204 | ||
6714d8e8 KH |
2205 | ret = 0; |
2206 | leave: | |
2207 | if (new_ctxt) | |
2208 | dlm_free_ctxt_mem(new_ctxt); | |
2209 | ||
2210 | if (ret < 0) | |
2211 | dlm = ERR_PTR(ret); | |
2212 | ||
2213 | return dlm; | |
2214 | } | |
2215 | EXPORT_SYMBOL_GPL(dlm_register_domain); | |
2216 | ||
2217 | static LIST_HEAD(dlm_join_handlers); | |
2218 | ||
2219 | static void dlm_unregister_net_handlers(void) | |
2220 | { | |
2221 | o2net_unregister_handler_list(&dlm_join_handlers); | |
2222 | } | |
2223 | ||
2224 | static int dlm_register_net_handlers(void) | |
2225 | { | |
2226 | int status = 0; | |
2227 | ||
2228 | status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, | |
2229 | sizeof(struct dlm_query_join_request), | |
2230 | dlm_query_join_handler, | |
d74c9803 | 2231 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
2232 | if (status) |
2233 | goto bail; | |
2234 | ||
2235 | status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
2236 | sizeof(struct dlm_assert_joined), | |
2237 | dlm_assert_joined_handler, | |
d74c9803 | 2238 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
2239 | if (status) |
2240 | goto bail; | |
2241 | ||
2242 | status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
2243 | sizeof(struct dlm_cancel_join), | |
2244 | dlm_cancel_join_handler, | |
d74c9803 | 2245 | NULL, NULL, &dlm_join_handlers); |
ea203441 SM |
2246 | if (status) |
2247 | goto bail; | |
2248 | ||
2249 | status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY, | |
2250 | sizeof(struct dlm_query_region), | |
2251 | dlm_query_region_handler, | |
2252 | NULL, NULL, &dlm_join_handlers); | |
6714d8e8 | 2253 | |
18cfdf1b SM |
2254 | if (status) |
2255 | goto bail; | |
2256 | ||
2257 | status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY, | |
2258 | sizeof(struct dlm_query_nodeinfo), | |
2259 | dlm_query_nodeinfo_handler, | |
2260 | NULL, NULL, &dlm_join_handlers); | |
6714d8e8 KH |
2261 | bail: |
2262 | if (status < 0) | |
2263 | dlm_unregister_net_handlers(); | |
2264 | ||
2265 | return status; | |
2266 | } | |
2267 | ||
2268 | /* Domain eviction callback handling. | |
2269 | * | |
2270 | * The file system requires notification of node death *before* the | |
2271 | * dlm completes it's recovery work, otherwise it may be able to | |
2272 | * acquire locks on resources requiring recovery. Since the dlm can | |
2273 | * evict a node from it's domain *before* heartbeat fires, a similar | |
2274 | * mechanism is required. */ | |
2275 | ||
2276 | /* Eviction is not expected to happen often, so a per-domain lock is | |
2277 | * not necessary. Eviction callbacks are allowed to sleep for short | |
2278 | * periods of time. */ | |
2279 | static DECLARE_RWSEM(dlm_callback_sem); | |
2280 | ||
2281 | void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm, | |
2282 | int node_num) | |
2283 | { | |
6714d8e8 KH |
2284 | struct dlm_eviction_cb *cb; |
2285 | ||
2286 | down_read(&dlm_callback_sem); | |
df53cd3b | 2287 | list_for_each_entry(cb, &dlm->dlm_eviction_callbacks, ec_item) { |
6714d8e8 KH |
2288 | cb->ec_func(node_num, cb->ec_data); |
2289 | } | |
2290 | up_read(&dlm_callback_sem); | |
2291 | } | |
2292 | ||
2293 | void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb, | |
2294 | dlm_eviction_func *f, | |
2295 | void *data) | |
2296 | { | |
2297 | INIT_LIST_HEAD(&cb->ec_item); | |
2298 | cb->ec_func = f; | |
2299 | cb->ec_data = data; | |
2300 | } | |
2301 | EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb); | |
2302 | ||
2303 | void dlm_register_eviction_cb(struct dlm_ctxt *dlm, | |
2304 | struct dlm_eviction_cb *cb) | |
2305 | { | |
2306 | down_write(&dlm_callback_sem); | |
2307 | list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks); | |
2308 | up_write(&dlm_callback_sem); | |
2309 | } | |
2310 | EXPORT_SYMBOL_GPL(dlm_register_eviction_cb); | |
2311 | ||
2312 | void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb) | |
2313 | { | |
2314 | down_write(&dlm_callback_sem); | |
2315 | list_del_init(&cb->ec_item); | |
2316 | up_write(&dlm_callback_sem); | |
2317 | } | |
2318 | EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb); | |
2319 | ||
2320 | static int __init dlm_init(void) | |
2321 | { | |
2322 | int status; | |
2323 | ||
6714d8e8 | 2324 | status = dlm_init_mle_cache(); |
12eb0035 SM |
2325 | if (status) { |
2326 | mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n"); | |
724bdca9 SM |
2327 | goto error; |
2328 | } | |
2329 | ||
2330 | status = dlm_init_master_caches(); | |
2331 | if (status) { | |
2332 | mlog(ML_ERROR, "Could not create o2dlm_lockres and " | |
2333 | "o2dlm_lockname slabcaches\n"); | |
2334 | goto error; | |
2335 | } | |
2336 | ||
2337 | status = dlm_init_lock_cache(); | |
2338 | if (status) { | |
2339 | mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n"); | |
2340 | goto error; | |
12eb0035 | 2341 | } |
6714d8e8 KH |
2342 | |
2343 | status = dlm_register_net_handlers(); | |
2344 | if (status) { | |
724bdca9 SM |
2345 | mlog(ML_ERROR, "Unable to register network handlers\n"); |
2346 | goto error; | |
6714d8e8 KH |
2347 | } |
2348 | ||
6325b4a2 SM |
2349 | status = dlm_create_debugfs_root(); |
2350 | if (status) | |
2351 | goto error; | |
2352 | ||
6714d8e8 | 2353 | return 0; |
724bdca9 | 2354 | error: |
6325b4a2 | 2355 | dlm_unregister_net_handlers(); |
724bdca9 SM |
2356 | dlm_destroy_lock_cache(); |
2357 | dlm_destroy_master_caches(); | |
2358 | dlm_destroy_mle_cache(); | |
2359 | return -1; | |
6714d8e8 KH |
2360 | } |
2361 | ||
2362 | static void __exit dlm_exit (void) | |
2363 | { | |
6325b4a2 | 2364 | dlm_destroy_debugfs_root(); |
6714d8e8 | 2365 | dlm_unregister_net_handlers(); |
724bdca9 SM |
2366 | dlm_destroy_lock_cache(); |
2367 | dlm_destroy_master_caches(); | |
6714d8e8 KH |
2368 | dlm_destroy_mle_cache(); |
2369 | } | |
2370 | ||
2371 | MODULE_AUTHOR("Oracle"); | |
2372 | MODULE_LICENSE("GPL"); | |
ff8fb335 | 2373 | MODULE_DESCRIPTION("OCFS2 Distributed Lock Management"); |
6714d8e8 KH |
2374 | |
2375 | module_init(dlm_init); | |
2376 | module_exit(dlm_exit); |