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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 KH |
45 | |
46 | #include "dlmver.h" | |
47 | ||
48 | #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN) | |
49 | #include "cluster/masklog.h" | |
50 | ||
1faf2894 SE |
51 | /* |
52 | * ocfs2 node maps are array of long int, which limits to send them freely | |
53 | * across the wire due to endianness issues. To workaround this, we convert | |
54 | * long ints to byte arrays. Following 3 routines are helper functions to | |
55 | * set/test/copy bits within those array of bytes | |
56 | */ | |
57 | static inline void byte_set_bit(u8 nr, u8 map[]) | |
58 | { | |
59 | map[nr >> 3] |= (1UL << (nr & 7)); | |
60 | } | |
61 | ||
62 | static inline int byte_test_bit(u8 nr, u8 map[]) | |
63 | { | |
64 | return ((1UL << (nr & 7)) & (map[nr >> 3])) != 0; | |
65 | } | |
66 | ||
67 | static inline void byte_copymap(u8 dmap[], unsigned long smap[], | |
68 | unsigned int sz) | |
69 | { | |
70 | unsigned int nn; | |
71 | ||
72 | if (!sz) | |
73 | return; | |
74 | ||
75 | memset(dmap, 0, ((sz + 7) >> 3)); | |
76 | for (nn = 0 ; nn < sz; nn++) | |
77 | if (test_bit(nn, smap)) | |
78 | byte_set_bit(nn, dmap); | |
79 | } | |
80 | ||
03d864c0 DP |
81 | static void dlm_free_pagevec(void **vec, int pages) |
82 | { | |
83 | while (pages--) | |
84 | free_page((unsigned long)vec[pages]); | |
85 | kfree(vec); | |
86 | } | |
87 | ||
88 | static void **dlm_alloc_pagevec(int pages) | |
89 | { | |
90 | void **vec = kmalloc(pages * sizeof(void *), GFP_KERNEL); | |
91 | int i; | |
92 | ||
93 | if (!vec) | |
94 | return NULL; | |
95 | ||
96 | for (i = 0; i < pages; i++) | |
97 | if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL))) | |
98 | goto out_free; | |
c8f33b6e | 99 | |
685f1adb | 100 | mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n", |
f5a923d1 MF |
101 | pages, (unsigned long)DLM_HASH_PAGES, |
102 | (unsigned long)DLM_BUCKETS_PER_PAGE); | |
03d864c0 DP |
103 | return vec; |
104 | out_free: | |
105 | dlm_free_pagevec(vec, i); | |
106 | return NULL; | |
107 | } | |
108 | ||
6714d8e8 KH |
109 | /* |
110 | * | |
111 | * spinlock lock ordering: if multiple locks are needed, obey this ordering: | |
112 | * dlm_domain_lock | |
113 | * struct dlm_ctxt->spinlock | |
114 | * struct dlm_lock_resource->spinlock | |
115 | * struct dlm_ctxt->master_lock | |
116 | * struct dlm_ctxt->ast_lock | |
117 | * dlm_master_list_entry->spinlock | |
118 | * dlm_lock->spinlock | |
119 | * | |
120 | */ | |
121 | ||
34af946a | 122 | DEFINE_SPINLOCK(dlm_domain_lock); |
6714d8e8 KH |
123 | LIST_HEAD(dlm_domains); |
124 | static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events); | |
125 | ||
d24fbcda JB |
126 | /* |
127 | * The supported protocol version for DLM communication. Running domains | |
128 | * will have a negotiated version with the same major number and a minor | |
129 | * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should | |
130 | * be used to determine what a running domain is actually using. | |
ea203441 SM |
131 | * |
132 | * New in version 1.1: | |
133 | * - Message DLM_QUERY_REGION added to support global heartbeat | |
18cfdf1b | 134 | * - Message DLM_QUERY_NODEINFO added to allow online node removes |
bddefdee SM |
135 | * New in version 1.2: |
136 | * - Message DLM_BEGIN_EXIT_DOMAIN_MSG added to mark start of exit domain | |
d24fbcda JB |
137 | */ |
138 | static const struct dlm_protocol_version dlm_protocol = { | |
139 | .pv_major = 1, | |
bddefdee | 140 | .pv_minor = 2, |
d24fbcda JB |
141 | }; |
142 | ||
6714d8e8 KH |
143 | #define DLM_DOMAIN_BACKOFF_MS 200 |
144 | ||
d74c9803 KH |
145 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
146 | void **ret_data); | |
147 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, | |
148 | void **ret_data); | |
149 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, | |
150 | void **ret_data); | |
ea203441 SM |
151 | static int dlm_query_region_handler(struct o2net_msg *msg, u32 len, |
152 | void *data, void **ret_data); | |
d74c9803 KH |
153 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
154 | void **ret_data); | |
d24fbcda JB |
155 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, |
156 | struct dlm_protocol_version *request); | |
6714d8e8 KH |
157 | |
158 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm); | |
159 | ||
160 | void __dlm_unhash_lockres(struct dlm_lock_resource *lockres) | |
161 | { | |
78062cb2 SM |
162 | if (!hlist_unhashed(&lockres->hash_node)) { |
163 | hlist_del_init(&lockres->hash_node); | |
164 | dlm_lockres_put(lockres); | |
165 | } | |
6714d8e8 KH |
166 | } |
167 | ||
168 | void __dlm_insert_lockres(struct dlm_ctxt *dlm, | |
169 | struct dlm_lock_resource *res) | |
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); |
6714d8e8 KH |
183 | } |
184 | ||
ba2bf218 KH |
185 | struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm, |
186 | const char *name, | |
187 | unsigned int len, | |
188 | unsigned int hash) | |
6714d8e8 | 189 | { |
81f2094a | 190 | struct hlist_head *bucket; |
4198985f | 191 | struct hlist_node *list; |
6714d8e8 | 192 | |
ef6b689b | 193 | mlog(0, "%.*s\n", len, name); |
6714d8e8 KH |
194 | |
195 | assert_spin_locked(&dlm->spinlock); | |
196 | ||
03d864c0 DP |
197 | bucket = dlm_lockres_hash(dlm, hash); |
198 | ||
4198985f DP |
199 | hlist_for_each(list, bucket) { |
200 | struct dlm_lock_resource *res = hlist_entry(list, | |
201 | struct dlm_lock_resource, hash_node); | |
202 | if (res->lockname.name[0] != name[0]) | |
203 | continue; | |
204 | if (unlikely(res->lockname.len != len)) | |
205 | continue; | |
206 | if (memcmp(res->lockname.name + 1, name + 1, len - 1)) | |
207 | continue; | |
208 | dlm_lockres_get(res); | |
209 | return res; | |
6714d8e8 | 210 | } |
4198985f | 211 | return NULL; |
6714d8e8 KH |
212 | } |
213 | ||
ba2bf218 KH |
214 | /* intended to be called by functions which do not care about lock |
215 | * resources which are being purged (most net _handler functions). | |
216 | * this will return NULL for any lock resource which is found but | |
217 | * currently in the process of dropping its mastery reference. | |
218 | * use __dlm_lookup_lockres_full when you need the lock resource | |
219 | * regardless (e.g. dlm_get_lock_resource) */ | |
220 | struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, | |
221 | const char *name, | |
222 | unsigned int len, | |
223 | unsigned int hash) | |
224 | { | |
225 | struct dlm_lock_resource *res = NULL; | |
226 | ||
ef6b689b | 227 | mlog(0, "%.*s\n", len, name); |
ba2bf218 KH |
228 | |
229 | assert_spin_locked(&dlm->spinlock); | |
230 | ||
231 | res = __dlm_lookup_lockres_full(dlm, name, len, hash); | |
232 | if (res) { | |
233 | spin_lock(&res->spinlock); | |
234 | if (res->state & DLM_LOCK_RES_DROPPING_REF) { | |
235 | spin_unlock(&res->spinlock); | |
236 | dlm_lockres_put(res); | |
237 | return NULL; | |
238 | } | |
239 | spin_unlock(&res->spinlock); | |
240 | } | |
241 | ||
242 | return res; | |
243 | } | |
244 | ||
6714d8e8 KH |
245 | struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, |
246 | const char *name, | |
247 | unsigned int len) | |
248 | { | |
249 | struct dlm_lock_resource *res; | |
a3d33291 | 250 | unsigned int hash = dlm_lockid_hash(name, len); |
6714d8e8 KH |
251 | |
252 | spin_lock(&dlm->spinlock); | |
a3d33291 | 253 | res = __dlm_lookup_lockres(dlm, name, len, hash); |
6714d8e8 KH |
254 | spin_unlock(&dlm->spinlock); |
255 | return res; | |
256 | } | |
257 | ||
258 | static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len) | |
259 | { | |
260 | struct dlm_ctxt *tmp = NULL; | |
261 | struct list_head *iter; | |
262 | ||
263 | assert_spin_locked(&dlm_domain_lock); | |
264 | ||
265 | /* tmp->name here is always NULL terminated, | |
266 | * but domain may not be! */ | |
267 | list_for_each(iter, &dlm_domains) { | |
268 | tmp = list_entry (iter, struct dlm_ctxt, list); | |
269 | if (strlen(tmp->name) == len && | |
270 | memcmp(tmp->name, domain, len)==0) | |
271 | break; | |
272 | tmp = NULL; | |
273 | } | |
274 | ||
275 | return tmp; | |
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 | ||
6714d8e8 KH |
317 | if (dlm->name) |
318 | kfree(dlm->name); | |
319 | ||
320 | kfree(dlm); | |
321 | } | |
322 | ||
323 | /* A little strange - this function will be called while holding | |
324 | * dlm_domain_lock and is expected to be holding it on the way out. We | |
325 | * will however drop and reacquire it multiple times */ | |
326 | static void dlm_ctxt_release(struct kref *kref) | |
327 | { | |
328 | struct dlm_ctxt *dlm; | |
329 | ||
330 | dlm = container_of(kref, struct dlm_ctxt, dlm_refs); | |
331 | ||
332 | BUG_ON(dlm->num_joins); | |
333 | BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED); | |
334 | ||
335 | /* we may still be in the list if we hit an error during join. */ | |
336 | list_del_init(&dlm->list); | |
337 | ||
338 | spin_unlock(&dlm_domain_lock); | |
339 | ||
340 | mlog(0, "freeing memory from domain %s\n", dlm->name); | |
341 | ||
342 | wake_up(&dlm_domain_events); | |
343 | ||
344 | dlm_free_ctxt_mem(dlm); | |
345 | ||
346 | spin_lock(&dlm_domain_lock); | |
347 | } | |
348 | ||
349 | void dlm_put(struct dlm_ctxt *dlm) | |
350 | { | |
351 | spin_lock(&dlm_domain_lock); | |
352 | kref_put(&dlm->dlm_refs, dlm_ctxt_release); | |
353 | spin_unlock(&dlm_domain_lock); | |
354 | } | |
355 | ||
356 | static void __dlm_get(struct dlm_ctxt *dlm) | |
357 | { | |
358 | kref_get(&dlm->dlm_refs); | |
359 | } | |
360 | ||
361 | /* given a questionable reference to a dlm object, gets a reference if | |
362 | * it can find it in the list, otherwise returns NULL in which case | |
363 | * you shouldn't trust your pointer. */ | |
364 | struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm) | |
365 | { | |
366 | struct list_head *iter; | |
367 | struct dlm_ctxt *target = NULL; | |
368 | ||
369 | spin_lock(&dlm_domain_lock); | |
370 | ||
371 | list_for_each(iter, &dlm_domains) { | |
372 | target = list_entry (iter, struct dlm_ctxt, list); | |
373 | ||
374 | if (target == dlm) { | |
375 | __dlm_get(target); | |
376 | break; | |
377 | } | |
378 | ||
379 | target = NULL; | |
380 | } | |
381 | ||
382 | spin_unlock(&dlm_domain_lock); | |
383 | ||
384 | return target; | |
385 | } | |
386 | ||
387 | int dlm_domain_fully_joined(struct dlm_ctxt *dlm) | |
388 | { | |
389 | int ret; | |
390 | ||
391 | spin_lock(&dlm_domain_lock); | |
392 | ret = (dlm->dlm_state == DLM_CTXT_JOINED) || | |
393 | (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN); | |
394 | spin_unlock(&dlm_domain_lock); | |
395 | ||
396 | return ret; | |
397 | } | |
398 | ||
3156d267 KH |
399 | static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm) |
400 | { | |
401 | if (dlm->dlm_worker) { | |
402 | flush_workqueue(dlm->dlm_worker); | |
403 | destroy_workqueue(dlm->dlm_worker); | |
404 | dlm->dlm_worker = NULL; | |
405 | } | |
406 | } | |
407 | ||
6714d8e8 KH |
408 | static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm) |
409 | { | |
410 | dlm_unregister_domain_handlers(dlm); | |
007dce53 | 411 | dlm_debug_shutdown(dlm); |
6714d8e8 KH |
412 | dlm_complete_thread(dlm); |
413 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 414 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
415 | |
416 | /* We've left the domain. Now we can take ourselves out of the | |
417 | * list and allow the kref stuff to help us free the | |
418 | * memory. */ | |
419 | spin_lock(&dlm_domain_lock); | |
420 | list_del_init(&dlm->list); | |
421 | spin_unlock(&dlm_domain_lock); | |
422 | ||
423 | /* Wake up anyone waiting for us to remove this domain */ | |
424 | wake_up(&dlm_domain_events); | |
425 | } | |
426 | ||
ba2bf218 | 427 | static int dlm_migrate_all_locks(struct dlm_ctxt *dlm) |
6714d8e8 | 428 | { |
ba2bf218 | 429 | int i, num, n, ret = 0; |
6714d8e8 | 430 | struct dlm_lock_resource *res; |
ba2bf218 KH |
431 | struct hlist_node *iter; |
432 | struct hlist_head *bucket; | |
433 | int dropped; | |
6714d8e8 KH |
434 | |
435 | mlog(0, "Migrating locks from domain %s\n", dlm->name); | |
ba2bf218 KH |
436 | |
437 | num = 0; | |
6714d8e8 | 438 | spin_lock(&dlm->spinlock); |
81f2094a | 439 | for (i = 0; i < DLM_HASH_BUCKETS; i++) { |
ba2bf218 KH |
440 | redo_bucket: |
441 | n = 0; | |
442 | bucket = dlm_lockres_hash(dlm, i); | |
443 | iter = bucket->first; | |
444 | while (iter) { | |
445 | n++; | |
446 | res = hlist_entry(iter, struct dlm_lock_resource, | |
447 | hash_node); | |
6714d8e8 | 448 | dlm_lockres_get(res); |
ba2bf218 KH |
449 | /* migrate, if necessary. this will drop the dlm |
450 | * spinlock and retake it if it does migration. */ | |
451 | dropped = dlm_empty_lockres(dlm, res); | |
452 | ||
453 | spin_lock(&res->spinlock); | |
66effd3c SM |
454 | if (dropped) |
455 | __dlm_lockres_calc_usage(dlm, res); | |
456 | else | |
457 | iter = res->hash_node.next; | |
ba2bf218 KH |
458 | spin_unlock(&res->spinlock); |
459 | ||
6714d8e8 | 460 | dlm_lockres_put(res); |
ba2bf218 | 461 | |
66effd3c SM |
462 | if (dropped) { |
463 | cond_resched_lock(&dlm->spinlock); | |
ba2bf218 | 464 | goto redo_bucket; |
66effd3c | 465 | } |
6714d8e8 | 466 | } |
0d01af6e | 467 | cond_resched_lock(&dlm->spinlock); |
ba2bf218 | 468 | num += n; |
6714d8e8 KH |
469 | } |
470 | spin_unlock(&dlm->spinlock); | |
ba2bf218 KH |
471 | wake_up(&dlm->dlm_thread_wq); |
472 | ||
473 | /* let the dlm thread take care of purging, keep scanning until | |
474 | * nothing remains in the hash */ | |
475 | if (num) { | |
476 | mlog(0, "%s: %d lock resources in hash last pass\n", | |
477 | dlm->name, num); | |
478 | ret = -EAGAIN; | |
479 | } | |
6714d8e8 | 480 | mlog(0, "DONE Migrating locks from domain %s\n", dlm->name); |
ba2bf218 | 481 | return ret; |
6714d8e8 KH |
482 | } |
483 | ||
484 | static int dlm_no_joining_node(struct dlm_ctxt *dlm) | |
485 | { | |
486 | int ret; | |
487 | ||
488 | spin_lock(&dlm->spinlock); | |
489 | ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN; | |
490 | spin_unlock(&dlm->spinlock); | |
491 | ||
492 | return ret; | |
493 | } | |
494 | ||
bddefdee SM |
495 | static int dlm_begin_exit_domain_handler(struct o2net_msg *msg, u32 len, |
496 | void *data, void **ret_data) | |
497 | { | |
498 | struct dlm_ctxt *dlm = data; | |
499 | unsigned int node; | |
500 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; | |
501 | ||
502 | if (!dlm_grab(dlm)) | |
503 | return 0; | |
504 | ||
505 | node = exit_msg->node_idx; | |
506 | mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm->name, node); | |
507 | ||
508 | spin_lock(&dlm->spinlock); | |
509 | set_bit(node, dlm->exit_domain_map); | |
510 | spin_unlock(&dlm->spinlock); | |
511 | ||
512 | dlm_put(dlm); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
6714d8e8 KH |
517 | static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm) |
518 | { | |
519 | /* Yikes, a double spinlock! I need domain_lock for the dlm | |
520 | * state and the dlm spinlock for join state... Sorry! */ | |
521 | again: | |
522 | spin_lock(&dlm_domain_lock); | |
523 | spin_lock(&dlm->spinlock); | |
524 | ||
525 | if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { | |
526 | mlog(0, "Node %d is joining, we wait on it.\n", | |
527 | dlm->joining_node); | |
528 | spin_unlock(&dlm->spinlock); | |
529 | spin_unlock(&dlm_domain_lock); | |
530 | ||
531 | wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm)); | |
532 | goto again; | |
533 | } | |
534 | ||
535 | dlm->dlm_state = DLM_CTXT_LEAVING; | |
536 | spin_unlock(&dlm->spinlock); | |
537 | spin_unlock(&dlm_domain_lock); | |
538 | } | |
539 | ||
540 | static void __dlm_print_nodes(struct dlm_ctxt *dlm) | |
541 | { | |
542 | int node = -1; | |
543 | ||
544 | assert_spin_locked(&dlm->spinlock); | |
545 | ||
5c80d4c9 | 546 | printk(KERN_NOTICE "o2dlm: Nodes in domain %s: ", dlm->name); |
6714d8e8 KH |
547 | |
548 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, | |
549 | node + 1)) < O2NM_MAX_NODES) { | |
781ee3e2 | 550 | printk("%d ", node); |
6714d8e8 | 551 | } |
781ee3e2 | 552 | printk("\n"); |
6714d8e8 KH |
553 | } |
554 | ||
d74c9803 KH |
555 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
556 | void **ret_data) | |
6714d8e8 KH |
557 | { |
558 | struct dlm_ctxt *dlm = data; | |
559 | unsigned int node; | |
560 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; | |
561 | ||
ef6b689b | 562 | mlog(0, "%p %u %p", msg, len, data); |
6714d8e8 KH |
563 | |
564 | if (!dlm_grab(dlm)) | |
565 | return 0; | |
566 | ||
567 | node = exit_msg->node_idx; | |
568 | ||
5c80d4c9 | 569 | printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s\n", node, dlm->name); |
6714d8e8 KH |
570 | |
571 | spin_lock(&dlm->spinlock); | |
572 | clear_bit(node, dlm->domain_map); | |
bddefdee | 573 | clear_bit(node, dlm->exit_domain_map); |
6714d8e8 KH |
574 | __dlm_print_nodes(dlm); |
575 | ||
576 | /* notify anything attached to the heartbeat events */ | |
577 | dlm_hb_event_notify_attached(dlm, node, 0); | |
578 | ||
579 | spin_unlock(&dlm->spinlock); | |
580 | ||
581 | dlm_put(dlm); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
bddefdee | 586 | static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, u32 msg_type, |
6714d8e8 KH |
587 | unsigned int node) |
588 | { | |
589 | int status; | |
590 | struct dlm_exit_domain leave_msg; | |
591 | ||
bddefdee SM |
592 | mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm->name, |
593 | msg_type, node); | |
6714d8e8 KH |
594 | |
595 | memset(&leave_msg, 0, sizeof(leave_msg)); | |
596 | leave_msg.node_idx = dlm->node_num; | |
597 | ||
bddefdee SM |
598 | status = o2net_send_message(msg_type, dlm->key, &leave_msg, |
599 | sizeof(leave_msg), node, NULL); | |
a5196ec5 | 600 | if (status < 0) |
bddefdee SM |
601 | mlog(ML_ERROR, "Error %d sending domain exit message %u " |
602 | "to node %u on domain %s\n", status, msg_type, node, | |
603 | dlm->name); | |
6714d8e8 KH |
604 | |
605 | return status; | |
606 | } | |
607 | ||
bddefdee SM |
608 | static void dlm_begin_exit_domain(struct dlm_ctxt *dlm) |
609 | { | |
610 | int node = -1; | |
611 | ||
612 | /* Support for begin exit domain was added in 1.2 */ | |
613 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
614 | dlm->dlm_locking_proto.pv_minor < 2) | |
615 | return; | |
616 | ||
617 | /* | |
618 | * Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely | |
619 | * informational. Meaning if a node does not receive the message, | |
620 | * so be it. | |
621 | */ | |
622 | spin_lock(&dlm->spinlock); | |
623 | while (1) { | |
624 | node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, node + 1); | |
625 | if (node >= O2NM_MAX_NODES) | |
626 | break; | |
627 | if (node == dlm->node_num) | |
628 | continue; | |
629 | ||
630 | spin_unlock(&dlm->spinlock); | |
631 | dlm_send_one_domain_exit(dlm, DLM_BEGIN_EXIT_DOMAIN_MSG, node); | |
632 | spin_lock(&dlm->spinlock); | |
633 | } | |
634 | spin_unlock(&dlm->spinlock); | |
635 | } | |
6714d8e8 KH |
636 | |
637 | static void dlm_leave_domain(struct dlm_ctxt *dlm) | |
638 | { | |
639 | int node, clear_node, status; | |
640 | ||
641 | /* At this point we've migrated away all our locks and won't | |
642 | * accept mastership of new ones. The dlm is responsible for | |
643 | * almost nothing now. We make sure not to confuse any joining | |
644 | * nodes and then commence shutdown procedure. */ | |
645 | ||
646 | spin_lock(&dlm->spinlock); | |
647 | /* Clear ourselves from the domain map */ | |
648 | clear_bit(dlm->node_num, dlm->domain_map); | |
649 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, | |
650 | 0)) < O2NM_MAX_NODES) { | |
651 | /* Drop the dlm spinlock. This is safe wrt the domain_map. | |
652 | * -nodes cannot be added now as the | |
653 | * query_join_handlers knows to respond with OK_NO_MAP | |
654 | * -we catch the right network errors if a node is | |
655 | * removed from the map while we're sending him the | |
656 | * exit message. */ | |
657 | spin_unlock(&dlm->spinlock); | |
658 | ||
659 | clear_node = 1; | |
660 | ||
bddefdee SM |
661 | status = dlm_send_one_domain_exit(dlm, DLM_EXIT_DOMAIN_MSG, |
662 | node); | |
6714d8e8 KH |
663 | if (status < 0 && |
664 | status != -ENOPROTOOPT && | |
665 | status != -ENOTCONN) { | |
666 | mlog(ML_NOTICE, "Error %d sending domain exit message " | |
667 | "to node %d\n", status, node); | |
668 | ||
669 | /* Not sure what to do here but lets sleep for | |
670 | * a bit in case this was a transient | |
671 | * error... */ | |
672 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
673 | clear_node = 0; | |
674 | } | |
675 | ||
676 | spin_lock(&dlm->spinlock); | |
677 | /* If we're not clearing the node bit then we intend | |
678 | * to loop back around to try again. */ | |
679 | if (clear_node) | |
680 | clear_bit(node, dlm->domain_map); | |
681 | } | |
682 | spin_unlock(&dlm->spinlock); | |
683 | } | |
684 | ||
685 | int dlm_joined(struct dlm_ctxt *dlm) | |
686 | { | |
687 | int ret = 0; | |
688 | ||
689 | spin_lock(&dlm_domain_lock); | |
690 | ||
691 | if (dlm->dlm_state == DLM_CTXT_JOINED) | |
692 | ret = 1; | |
693 | ||
694 | spin_unlock(&dlm_domain_lock); | |
695 | ||
696 | return ret; | |
697 | } | |
698 | ||
699 | int dlm_shutting_down(struct dlm_ctxt *dlm) | |
700 | { | |
701 | int ret = 0; | |
702 | ||
703 | spin_lock(&dlm_domain_lock); | |
704 | ||
705 | if (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN) | |
706 | ret = 1; | |
707 | ||
708 | spin_unlock(&dlm_domain_lock); | |
709 | ||
710 | return ret; | |
711 | } | |
712 | ||
713 | void dlm_unregister_domain(struct dlm_ctxt *dlm) | |
714 | { | |
715 | int leave = 0; | |
29576f8b | 716 | struct dlm_lock_resource *res; |
6714d8e8 KH |
717 | |
718 | spin_lock(&dlm_domain_lock); | |
719 | BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED); | |
720 | BUG_ON(!dlm->num_joins); | |
721 | ||
722 | dlm->num_joins--; | |
723 | if (!dlm->num_joins) { | |
724 | /* We mark it "in shutdown" now so new register | |
725 | * requests wait until we've completely left the | |
726 | * domain. Don't use DLM_CTXT_LEAVING yet as we still | |
727 | * want new domain joins to communicate with us at | |
728 | * least until we've completed migration of our | |
729 | * resources. */ | |
730 | dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN; | |
731 | leave = 1; | |
732 | } | |
733 | spin_unlock(&dlm_domain_lock); | |
734 | ||
735 | if (leave) { | |
736 | mlog(0, "shutting down domain %s\n", dlm->name); | |
bddefdee | 737 | dlm_begin_exit_domain(dlm); |
6714d8e8 KH |
738 | |
739 | /* We changed dlm state, notify the thread */ | |
740 | dlm_kick_thread(dlm, NULL); | |
741 | ||
ba2bf218 | 742 | while (dlm_migrate_all_locks(dlm)) { |
2f5bf1f2 SM |
743 | /* Give dlm_thread time to purge the lockres' */ |
744 | msleep(500); | |
ba2bf218 KH |
745 | mlog(0, "%s: more migration to do\n", dlm->name); |
746 | } | |
29576f8b SM |
747 | |
748 | /* This list should be empty. If not, print remaining lockres */ | |
749 | if (!list_empty(&dlm->tracking_list)) { | |
750 | mlog(ML_ERROR, "Following lockres' are still on the " | |
751 | "tracking list:\n"); | |
752 | list_for_each_entry(res, &dlm->tracking_list, tracking) | |
753 | dlm_print_one_lock_resource(res); | |
754 | } | |
755 | ||
6714d8e8 KH |
756 | dlm_mark_domain_leaving(dlm); |
757 | dlm_leave_domain(dlm); | |
5dad6c39 | 758 | dlm_force_free_mles(dlm); |
6714d8e8 KH |
759 | dlm_complete_dlm_shutdown(dlm); |
760 | } | |
761 | dlm_put(dlm); | |
762 | } | |
763 | EXPORT_SYMBOL_GPL(dlm_unregister_domain); | |
764 | ||
d24fbcda JB |
765 | static int dlm_query_join_proto_check(char *proto_type, int node, |
766 | struct dlm_protocol_version *ours, | |
767 | struct dlm_protocol_version *request) | |
768 | { | |
769 | int rc; | |
770 | struct dlm_protocol_version proto = *request; | |
771 | ||
772 | if (!dlm_protocol_compare(ours, &proto)) { | |
773 | mlog(0, | |
774 | "node %u wanted to join with %s locking protocol " | |
775 | "%u.%u, we respond with %u.%u\n", | |
776 | node, proto_type, | |
777 | request->pv_major, | |
778 | request->pv_minor, | |
779 | proto.pv_major, proto.pv_minor); | |
780 | request->pv_minor = proto.pv_minor; | |
781 | rc = 0; | |
782 | } else { | |
783 | mlog(ML_NOTICE, | |
784 | "Node %u wanted to join with %s locking " | |
785 | "protocol %u.%u, but we have %u.%u, disallowing\n", | |
786 | node, proto_type, | |
787 | request->pv_major, | |
788 | request->pv_minor, | |
789 | ours->pv_major, | |
790 | ours->pv_minor); | |
791 | rc = 1; | |
792 | } | |
793 | ||
794 | return rc; | |
795 | } | |
796 | ||
0f71b7b4 JB |
797 | /* |
798 | * struct dlm_query_join_packet is made up of four one-byte fields. They | |
799 | * are effectively in big-endian order already. However, little-endian | |
800 | * machines swap them before putting the packet on the wire (because | |
801 | * query_join's response is a status, and that status is treated as a u32 | |
802 | * on the wire). Thus, a big-endian and little-endian machines will treat | |
803 | * this structure differently. | |
804 | * | |
805 | * The solution is to have little-endian machines swap the structure when | |
806 | * converting from the structure to the u32 representation. This will | |
807 | * result in the structure having the correct format on the wire no matter | |
808 | * the host endian format. | |
809 | */ | |
810 | static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet, | |
811 | u32 *wire) | |
812 | { | |
813 | union dlm_query_join_response response; | |
814 | ||
815 | response.packet = *packet; | |
816 | *wire = cpu_to_be32(response.intval); | |
817 | } | |
818 | ||
819 | static void dlm_query_join_wire_to_packet(u32 wire, | |
820 | struct dlm_query_join_packet *packet) | |
821 | { | |
822 | union dlm_query_join_response response; | |
823 | ||
824 | response.intval = cpu_to_be32(wire); | |
825 | *packet = response.packet; | |
826 | } | |
827 | ||
d74c9803 KH |
828 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
829 | void **ret_data) | |
6714d8e8 KH |
830 | { |
831 | struct dlm_query_join_request *query; | |
0f71b7b4 JB |
832 | struct dlm_query_join_packet packet = { |
833 | .code = JOIN_DISALLOW, | |
d24fbcda | 834 | }; |
6714d8e8 | 835 | struct dlm_ctxt *dlm = NULL; |
0f71b7b4 | 836 | u32 response; |
1faf2894 | 837 | u8 nodenum; |
6714d8e8 KH |
838 | |
839 | query = (struct dlm_query_join_request *) msg->buf; | |
840 | ||
841 | mlog(0, "node %u wants to join domain %s\n", query->node_idx, | |
842 | query->domain); | |
843 | ||
844 | /* | |
845 | * If heartbeat doesn't consider the node live, tell it | |
846 | * to back off and try again. This gives heartbeat a chance | |
847 | * to catch up. | |
848 | */ | |
849 | if (!o2hb_check_node_heartbeating(query->node_idx)) { | |
850 | mlog(0, "node %u is not in our live map yet\n", | |
851 | query->node_idx); | |
852 | ||
0f71b7b4 | 853 | packet.code = JOIN_DISALLOW; |
6714d8e8 KH |
854 | goto respond; |
855 | } | |
856 | ||
0f71b7b4 | 857 | packet.code = JOIN_OK_NO_MAP; |
6714d8e8 KH |
858 | |
859 | spin_lock(&dlm_domain_lock); | |
860 | dlm = __dlm_lookup_domain_full(query->domain, query->name_len); | |
1faf2894 SE |
861 | if (!dlm) |
862 | goto unlock_respond; | |
863 | ||
864 | /* | |
865 | * There is a small window where the joining node may not see the | |
866 | * node(s) that just left but still part of the cluster. DISALLOW | |
867 | * join request if joining node has different node map. | |
868 | */ | |
869 | nodenum=0; | |
870 | while (nodenum < O2NM_MAX_NODES) { | |
871 | if (test_bit(nodenum, dlm->domain_map)) { | |
872 | if (!byte_test_bit(nodenum, query->node_map)) { | |
e4968476 SM |
873 | mlog(0, "disallow join as node %u does not " |
874 | "have node %u in its nodemap\n", | |
875 | query->node_idx, nodenum); | |
0f71b7b4 | 876 | packet.code = JOIN_DISALLOW; |
1faf2894 SE |
877 | goto unlock_respond; |
878 | } | |
879 | } | |
880 | nodenum++; | |
881 | } | |
882 | ||
6714d8e8 | 883 | /* Once the dlm ctxt is marked as leaving then we don't want |
2bd63216 | 884 | * to be put in someone's domain map. |
e2faea4c KH |
885 | * Also, explicitly disallow joining at certain troublesome |
886 | * times (ie. during recovery). */ | |
6714d8e8 | 887 | if (dlm && dlm->dlm_state != DLM_CTXT_LEAVING) { |
e2faea4c | 888 | int bit = query->node_idx; |
6714d8e8 KH |
889 | spin_lock(&dlm->spinlock); |
890 | ||
891 | if (dlm->dlm_state == DLM_CTXT_NEW && | |
892 | dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) { | |
893 | /*If this is a brand new context and we | |
894 | * haven't started our join process yet, then | |
895 | * the other node won the race. */ | |
0f71b7b4 | 896 | packet.code = JOIN_OK_NO_MAP; |
6714d8e8 KH |
897 | } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { |
898 | /* Disallow parallel joins. */ | |
0f71b7b4 | 899 | packet.code = JOIN_DISALLOW; |
e2faea4c | 900 | } else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) { |
e4968476 | 901 | mlog(0, "node %u trying to join, but recovery " |
e2faea4c | 902 | "is ongoing.\n", bit); |
0f71b7b4 | 903 | packet.code = JOIN_DISALLOW; |
e2faea4c | 904 | } else if (test_bit(bit, dlm->recovery_map)) { |
e4968476 | 905 | mlog(0, "node %u trying to join, but it " |
e2faea4c | 906 | "still needs recovery.\n", bit); |
0f71b7b4 | 907 | packet.code = JOIN_DISALLOW; |
e2faea4c | 908 | } else if (test_bit(bit, dlm->domain_map)) { |
e4968476 | 909 | mlog(0, "node %u trying to join, but it " |
e2faea4c KH |
910 | "is still in the domain! needs recovery?\n", |
911 | bit); | |
0f71b7b4 | 912 | packet.code = JOIN_DISALLOW; |
6714d8e8 KH |
913 | } else { |
914 | /* Alright we're fully a part of this domain | |
915 | * so we keep some state as to who's joining | |
916 | * and indicate to him that needs to be fixed | |
917 | * up. */ | |
d24fbcda JB |
918 | |
919 | /* Make sure we speak compatible locking protocols. */ | |
920 | if (dlm_query_join_proto_check("DLM", bit, | |
921 | &dlm->dlm_locking_proto, | |
922 | &query->dlm_proto)) { | |
0f71b7b4 | 923 | packet.code = JOIN_PROTOCOL_MISMATCH; |
d24fbcda JB |
924 | } else if (dlm_query_join_proto_check("fs", bit, |
925 | &dlm->fs_locking_proto, | |
926 | &query->fs_proto)) { | |
0f71b7b4 | 927 | packet.code = JOIN_PROTOCOL_MISMATCH; |
d24fbcda | 928 | } else { |
0f71b7b4 JB |
929 | packet.dlm_minor = query->dlm_proto.pv_minor; |
930 | packet.fs_minor = query->fs_proto.pv_minor; | |
931 | packet.code = JOIN_OK; | |
d24fbcda JB |
932 | __dlm_set_joining_node(dlm, query->node_idx); |
933 | } | |
6714d8e8 KH |
934 | } |
935 | ||
936 | spin_unlock(&dlm->spinlock); | |
937 | } | |
1faf2894 | 938 | unlock_respond: |
6714d8e8 KH |
939 | spin_unlock(&dlm_domain_lock); |
940 | ||
941 | respond: | |
0f71b7b4 | 942 | mlog(0, "We respond with %u\n", packet.code); |
6714d8e8 | 943 | |
0f71b7b4 JB |
944 | dlm_query_join_packet_to_wire(&packet, &response); |
945 | return response; | |
6714d8e8 KH |
946 | } |
947 | ||
d74c9803 KH |
948 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, |
949 | void **ret_data) | |
6714d8e8 KH |
950 | { |
951 | struct dlm_assert_joined *assert; | |
952 | struct dlm_ctxt *dlm = NULL; | |
953 | ||
954 | assert = (struct dlm_assert_joined *) msg->buf; | |
955 | ||
956 | mlog(0, "node %u asserts join on domain %s\n", assert->node_idx, | |
957 | assert->domain); | |
958 | ||
959 | spin_lock(&dlm_domain_lock); | |
960 | dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len); | |
961 | /* XXX should we consider no dlm ctxt an error? */ | |
962 | if (dlm) { | |
963 | spin_lock(&dlm->spinlock); | |
964 | ||
965 | /* Alright, this node has officially joined our | |
966 | * domain. Set him in the map and clean up our | |
967 | * leftover join state. */ | |
968 | BUG_ON(dlm->joining_node != assert->node_idx); | |
969 | set_bit(assert->node_idx, dlm->domain_map); | |
bddefdee | 970 | clear_bit(assert->node_idx, dlm->exit_domain_map); |
6714d8e8 KH |
971 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); |
972 | ||
5c80d4c9 | 973 | printk(KERN_NOTICE "o2dlm: Node %u joins domain %s\n", |
781ee3e2 | 974 | assert->node_idx, dlm->name); |
6714d8e8 KH |
975 | __dlm_print_nodes(dlm); |
976 | ||
977 | /* notify anything attached to the heartbeat events */ | |
978 | dlm_hb_event_notify_attached(dlm, assert->node_idx, 1); | |
979 | ||
980 | spin_unlock(&dlm->spinlock); | |
981 | } | |
982 | spin_unlock(&dlm_domain_lock); | |
983 | ||
984 | return 0; | |
985 | } | |
986 | ||
ea203441 | 987 | static int dlm_match_regions(struct dlm_ctxt *dlm, |
770c4d81 SM |
988 | struct dlm_query_region *qr, |
989 | char *local, int locallen) | |
ea203441 | 990 | { |
770c4d81 | 991 | char *remote = qr->qr_regions; |
ea203441 SM |
992 | char *l, *r; |
993 | int localnr, i, j, foundit; | |
994 | int status = 0; | |
995 | ||
996 | if (!o2hb_global_heartbeat_active()) { | |
997 | if (qr->qr_numregions) { | |
998 | mlog(ML_ERROR, "Domain %s: Joining node %d has global " | |
999 | "heartbeat enabled but local node %d does not\n", | |
1000 | qr->qr_domain, qr->qr_node, dlm->node_num); | |
1001 | status = -EINVAL; | |
1002 | } | |
1003 | goto bail; | |
1004 | } | |
1005 | ||
1006 | if (o2hb_global_heartbeat_active() && !qr->qr_numregions) { | |
1007 | mlog(ML_ERROR, "Domain %s: Local node %d has global " | |
1008 | "heartbeat enabled but joining node %d does not\n", | |
1009 | qr->qr_domain, dlm->node_num, qr->qr_node); | |
1010 | status = -EINVAL; | |
1011 | goto bail; | |
1012 | } | |
1013 | ||
1014 | r = remote; | |
1015 | for (i = 0; i < qr->qr_numregions; ++i) { | |
1016 | mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r); | |
1017 | r += O2HB_MAX_REGION_NAME_LEN; | |
1018 | } | |
1019 | ||
770c4d81 SM |
1020 | localnr = min(O2NM_MAX_REGIONS, locallen/O2HB_MAX_REGION_NAME_LEN); |
1021 | localnr = o2hb_get_all_regions(local, (u8)localnr); | |
ea203441 SM |
1022 | |
1023 | /* compare local regions with remote */ | |
1024 | l = local; | |
1025 | for (i = 0; i < localnr; ++i) { | |
1026 | foundit = 0; | |
1027 | r = remote; | |
1028 | for (j = 0; j <= qr->qr_numregions; ++j) { | |
1029 | if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) { | |
1030 | foundit = 1; | |
1031 | break; | |
1032 | } | |
1033 | r += O2HB_MAX_REGION_NAME_LEN; | |
1034 | } | |
1035 | if (!foundit) { | |
1036 | status = -EINVAL; | |
1037 | mlog(ML_ERROR, "Domain %s: Region '%.*s' registered " | |
1038 | "in local node %d but not in joining node %d\n", | |
1039 | qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l, | |
1040 | dlm->node_num, qr->qr_node); | |
1041 | goto bail; | |
1042 | } | |
1043 | l += O2HB_MAX_REGION_NAME_LEN; | |
1044 | } | |
1045 | ||
1046 | /* compare remote with local regions */ | |
1047 | r = remote; | |
1048 | for (i = 0; i < qr->qr_numregions; ++i) { | |
1049 | foundit = 0; | |
1050 | l = local; | |
1051 | for (j = 0; j < localnr; ++j) { | |
1052 | if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) { | |
1053 | foundit = 1; | |
1054 | break; | |
1055 | } | |
1056 | l += O2HB_MAX_REGION_NAME_LEN; | |
1057 | } | |
1058 | if (!foundit) { | |
1059 | status = -EINVAL; | |
1060 | mlog(ML_ERROR, "Domain %s: Region '%.*s' registered " | |
1061 | "in joining node %d but not in local node %d\n", | |
1062 | qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r, | |
1063 | qr->qr_node, dlm->node_num); | |
1064 | goto bail; | |
1065 | } | |
1066 | r += O2HB_MAX_REGION_NAME_LEN; | |
1067 | } | |
1068 | ||
1069 | bail: | |
ea203441 SM |
1070 | return status; |
1071 | } | |
1072 | ||
1073 | static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map) | |
1074 | { | |
1075 | struct dlm_query_region *qr = NULL; | |
1076 | int status, ret = 0, i; | |
1077 | char *p; | |
1078 | ||
1079 | if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES) | |
1080 | goto bail; | |
1081 | ||
1082 | qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL); | |
1083 | if (!qr) { | |
1084 | ret = -ENOMEM; | |
1085 | mlog_errno(ret); | |
1086 | goto bail; | |
1087 | } | |
1088 | ||
1089 | qr->qr_node = dlm->node_num; | |
1090 | qr->qr_namelen = strlen(dlm->name); | |
1091 | memcpy(qr->qr_domain, dlm->name, qr->qr_namelen); | |
1092 | /* if local hb, the numregions will be zero */ | |
1093 | if (o2hb_global_heartbeat_active()) | |
1094 | qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions, | |
1095 | O2NM_MAX_REGIONS); | |
1096 | ||
1097 | p = qr->qr_regions; | |
1098 | for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN) | |
1099 | mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p); | |
1100 | ||
1101 | i = -1; | |
1102 | while ((i = find_next_bit(node_map, O2NM_MAX_NODES, | |
1103 | i + 1)) < O2NM_MAX_NODES) { | |
1104 | if (i == dlm->node_num) | |
1105 | continue; | |
1106 | ||
1107 | mlog(0, "Sending regions to node %d\n", i); | |
1108 | ||
1109 | ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr, | |
1110 | sizeof(struct dlm_query_region), | |
1111 | i, &status); | |
1112 | if (ret >= 0) | |
1113 | ret = status; | |
1114 | if (ret) { | |
1115 | mlog(ML_ERROR, "Region mismatch %d, node %d\n", | |
1116 | ret, i); | |
1117 | break; | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | bail: | |
1122 | kfree(qr); | |
1123 | return ret; | |
1124 | } | |
1125 | ||
1126 | static int dlm_query_region_handler(struct o2net_msg *msg, u32 len, | |
1127 | void *data, void **ret_data) | |
1128 | { | |
1129 | struct dlm_query_region *qr; | |
1130 | struct dlm_ctxt *dlm = NULL; | |
770c4d81 | 1131 | char *local = NULL; |
ea203441 SM |
1132 | int status = 0; |
1133 | int locked = 0; | |
1134 | ||
1135 | qr = (struct dlm_query_region *) msg->buf; | |
1136 | ||
1137 | mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node, | |
1138 | qr->qr_domain); | |
1139 | ||
770c4d81 SM |
1140 | /* buffer used in dlm_mast_regions() */ |
1141 | local = kmalloc(sizeof(qr->qr_regions), GFP_KERNEL); | |
1142 | if (!local) { | |
1143 | status = -ENOMEM; | |
1144 | goto bail; | |
1145 | } | |
1146 | ||
ea203441 SM |
1147 | status = -EINVAL; |
1148 | ||
1149 | spin_lock(&dlm_domain_lock); | |
1150 | dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen); | |
1151 | if (!dlm) { | |
1152 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " | |
1153 | "before join domain\n", qr->qr_node, qr->qr_domain); | |
1154 | goto bail; | |
1155 | } | |
1156 | ||
1157 | spin_lock(&dlm->spinlock); | |
1158 | locked = 1; | |
1159 | if (dlm->joining_node != qr->qr_node) { | |
1160 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " | |
1161 | "but joining node is %d\n", qr->qr_node, qr->qr_domain, | |
1162 | dlm->joining_node); | |
1163 | goto bail; | |
1164 | } | |
1165 | ||
1166 | /* Support for global heartbeat was added in 1.1 */ | |
1167 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
1168 | dlm->dlm_locking_proto.pv_minor == 0) { | |
1169 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " | |
1170 | "but active dlm protocol is %d.%d\n", qr->qr_node, | |
1171 | qr->qr_domain, dlm->dlm_locking_proto.pv_major, | |
1172 | dlm->dlm_locking_proto.pv_minor); | |
1173 | goto bail; | |
1174 | } | |
1175 | ||
770c4d81 | 1176 | status = dlm_match_regions(dlm, qr, local, sizeof(qr->qr_regions)); |
ea203441 SM |
1177 | |
1178 | bail: | |
1179 | if (locked) | |
1180 | spin_unlock(&dlm->spinlock); | |
1181 | spin_unlock(&dlm_domain_lock); | |
1182 | ||
770c4d81 SM |
1183 | kfree(local); |
1184 | ||
ea203441 SM |
1185 | return status; |
1186 | } | |
1187 | ||
18cfdf1b SM |
1188 | static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn) |
1189 | { | |
1190 | struct o2nm_node *local; | |
1191 | struct dlm_node_info *remote; | |
1192 | int i, j; | |
1193 | int status = 0; | |
1194 | ||
1195 | for (j = 0; j < qn->qn_numnodes; ++j) | |
1196 | mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum, | |
1197 | &(qn->qn_nodes[j].ni_ipv4_address), | |
1198 | ntohs(qn->qn_nodes[j].ni_ipv4_port)); | |
1199 | ||
1200 | for (i = 0; i < O2NM_MAX_NODES && !status; ++i) { | |
1201 | local = o2nm_get_node_by_num(i); | |
1202 | remote = NULL; | |
1203 | for (j = 0; j < qn->qn_numnodes; ++j) { | |
1204 | if (qn->qn_nodes[j].ni_nodenum == i) { | |
1205 | remote = &(qn->qn_nodes[j]); | |
1206 | break; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | if (!local && !remote) | |
1211 | continue; | |
1212 | ||
1213 | if ((local && !remote) || (!local && remote)) | |
1214 | status = -EINVAL; | |
1215 | ||
1216 | if (!status && | |
1217 | ((remote->ni_nodenum != local->nd_num) || | |
1218 | (remote->ni_ipv4_port != local->nd_ipv4_port) || | |
1219 | (remote->ni_ipv4_address != local->nd_ipv4_address))) | |
1220 | status = -EINVAL; | |
1221 | ||
1222 | if (status) { | |
1223 | if (remote && !local) | |
1224 | mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) " | |
1225 | "registered in joining node %d but not in " | |
1226 | "local node %d\n", qn->qn_domain, | |
1227 | remote->ni_nodenum, | |
1228 | &(remote->ni_ipv4_address), | |
1229 | ntohs(remote->ni_ipv4_port), | |
1230 | qn->qn_nodenum, dlm->node_num); | |
1231 | if (local && !remote) | |
1232 | mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) " | |
1233 | "registered in local node %d but not in " | |
1234 | "joining node %d\n", qn->qn_domain, | |
1235 | local->nd_num, &(local->nd_ipv4_address), | |
1236 | ntohs(local->nd_ipv4_port), | |
1237 | dlm->node_num, qn->qn_nodenum); | |
1238 | BUG_ON((!local && !remote)); | |
1239 | } | |
1240 | ||
1241 | if (local) | |
1242 | o2nm_node_put(local); | |
1243 | } | |
1244 | ||
1245 | return status; | |
1246 | } | |
1247 | ||
1248 | static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map) | |
1249 | { | |
1250 | struct dlm_query_nodeinfo *qn = NULL; | |
1251 | struct o2nm_node *node; | |
1252 | int ret = 0, status, count, i; | |
1253 | ||
1254 | if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES) | |
1255 | goto bail; | |
1256 | ||
1257 | qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL); | |
1258 | if (!qn) { | |
1259 | ret = -ENOMEM; | |
1260 | mlog_errno(ret); | |
1261 | goto bail; | |
1262 | } | |
1263 | ||
1264 | for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) { | |
1265 | node = o2nm_get_node_by_num(i); | |
1266 | if (!node) | |
1267 | continue; | |
1268 | qn->qn_nodes[count].ni_nodenum = node->nd_num; | |
1269 | qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port; | |
1270 | qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address; | |
1271 | mlog(0, "Node %3d, %pI4:%u\n", node->nd_num, | |
1272 | &(node->nd_ipv4_address), ntohs(node->nd_ipv4_port)); | |
1273 | ++count; | |
1274 | o2nm_node_put(node); | |
1275 | } | |
1276 | ||
1277 | qn->qn_nodenum = dlm->node_num; | |
1278 | qn->qn_numnodes = count; | |
1279 | qn->qn_namelen = strlen(dlm->name); | |
1280 | memcpy(qn->qn_domain, dlm->name, qn->qn_namelen); | |
1281 | ||
1282 | i = -1; | |
1283 | while ((i = find_next_bit(node_map, O2NM_MAX_NODES, | |
1284 | i + 1)) < O2NM_MAX_NODES) { | |
1285 | if (i == dlm->node_num) | |
1286 | continue; | |
1287 | ||
1288 | mlog(0, "Sending nodeinfo to node %d\n", i); | |
1289 | ||
1290 | ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY, | |
1291 | qn, sizeof(struct dlm_query_nodeinfo), | |
1292 | i, &status); | |
1293 | if (ret >= 0) | |
1294 | ret = status; | |
1295 | if (ret) { | |
1296 | mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i); | |
1297 | break; | |
1298 | } | |
1299 | } | |
1300 | ||
1301 | bail: | |
1302 | kfree(qn); | |
1303 | return ret; | |
1304 | } | |
1305 | ||
1306 | static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len, | |
1307 | void *data, void **ret_data) | |
1308 | { | |
1309 | struct dlm_query_nodeinfo *qn; | |
1310 | struct dlm_ctxt *dlm = NULL; | |
1311 | int locked = 0, status = -EINVAL; | |
1312 | ||
1313 | qn = (struct dlm_query_nodeinfo *) msg->buf; | |
1314 | ||
1315 | mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum, | |
1316 | qn->qn_domain); | |
1317 | ||
1318 | spin_lock(&dlm_domain_lock); | |
1319 | dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen); | |
1320 | if (!dlm) { | |
1321 | mlog(ML_ERROR, "Node %d queried nodes on domain %s before " | |
1322 | "join domain\n", qn->qn_nodenum, qn->qn_domain); | |
1323 | goto bail; | |
1324 | } | |
1325 | ||
1326 | spin_lock(&dlm->spinlock); | |
1327 | locked = 1; | |
1328 | if (dlm->joining_node != qn->qn_nodenum) { | |
1329 | mlog(ML_ERROR, "Node %d queried nodes on domain %s but " | |
1330 | "joining node is %d\n", qn->qn_nodenum, qn->qn_domain, | |
1331 | dlm->joining_node); | |
1332 | goto bail; | |
1333 | } | |
1334 | ||
1335 | /* Support for node query was added in 1.1 */ | |
1336 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
1337 | dlm->dlm_locking_proto.pv_minor == 0) { | |
1338 | mlog(ML_ERROR, "Node %d queried nodes on domain %s " | |
1339 | "but active dlm protocol is %d.%d\n", qn->qn_nodenum, | |
1340 | qn->qn_domain, dlm->dlm_locking_proto.pv_major, | |
1341 | dlm->dlm_locking_proto.pv_minor); | |
1342 | goto bail; | |
1343 | } | |
1344 | ||
1345 | status = dlm_match_nodes(dlm, qn); | |
1346 | ||
1347 | bail: | |
1348 | if (locked) | |
1349 | spin_unlock(&dlm->spinlock); | |
1350 | spin_unlock(&dlm_domain_lock); | |
1351 | ||
1352 | return status; | |
1353 | } | |
1354 | ||
d74c9803 KH |
1355 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, |
1356 | void **ret_data) | |
6714d8e8 KH |
1357 | { |
1358 | struct dlm_cancel_join *cancel; | |
1359 | struct dlm_ctxt *dlm = NULL; | |
1360 | ||
1361 | cancel = (struct dlm_cancel_join *) msg->buf; | |
1362 | ||
1363 | mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx, | |
1364 | cancel->domain); | |
1365 | ||
1366 | spin_lock(&dlm_domain_lock); | |
1367 | dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len); | |
1368 | ||
1369 | if (dlm) { | |
1370 | spin_lock(&dlm->spinlock); | |
1371 | ||
1372 | /* Yikes, this guy wants to cancel his join. No | |
1373 | * problem, we simply cleanup our join state. */ | |
1374 | BUG_ON(dlm->joining_node != cancel->node_idx); | |
1375 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
1376 | ||
1377 | spin_unlock(&dlm->spinlock); | |
1378 | } | |
1379 | spin_unlock(&dlm_domain_lock); | |
1380 | ||
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm, | |
1385 | unsigned int node) | |
1386 | { | |
1387 | int status; | |
1388 | struct dlm_cancel_join cancel_msg; | |
1389 | ||
1390 | memset(&cancel_msg, 0, sizeof(cancel_msg)); | |
1391 | cancel_msg.node_idx = dlm->node_num; | |
1392 | cancel_msg.name_len = strlen(dlm->name); | |
1393 | memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len); | |
1394 | ||
1395 | status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
1396 | &cancel_msg, sizeof(cancel_msg), node, | |
1397 | NULL); | |
1398 | if (status < 0) { | |
a5196ec5 WW |
1399 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1400 | "node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
1401 | node); | |
6714d8e8 KH |
1402 | goto bail; |
1403 | } | |
1404 | ||
1405 | bail: | |
1406 | return status; | |
1407 | } | |
1408 | ||
1409 | /* map_size should be in bytes. */ | |
1410 | static int dlm_send_join_cancels(struct dlm_ctxt *dlm, | |
1411 | unsigned long *node_map, | |
1412 | unsigned int map_size) | |
1413 | { | |
1414 | int status, tmpstat; | |
1415 | unsigned int node; | |
1416 | ||
1417 | if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) * | |
1418 | sizeof(unsigned long))) { | |
1419 | mlog(ML_ERROR, | |
1420 | "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n", | |
3a4780a8 | 1421 | map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES)); |
6714d8e8 KH |
1422 | return -EINVAL; |
1423 | } | |
1424 | ||
1425 | status = 0; | |
1426 | node = -1; | |
1427 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, | |
1428 | node + 1)) < O2NM_MAX_NODES) { | |
1429 | if (node == dlm->node_num) | |
1430 | continue; | |
1431 | ||
1432 | tmpstat = dlm_send_one_join_cancel(dlm, node); | |
1433 | if (tmpstat) { | |
1434 | mlog(ML_ERROR, "Error return %d cancelling join on " | |
1435 | "node %d\n", tmpstat, node); | |
1436 | if (!status) | |
1437 | status = tmpstat; | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | if (status) | |
1442 | mlog_errno(status); | |
1443 | return status; | |
1444 | } | |
1445 | ||
1446 | static int dlm_request_join(struct dlm_ctxt *dlm, | |
1447 | int node, | |
d24fbcda | 1448 | enum dlm_query_join_response_code *response) |
6714d8e8 | 1449 | { |
d24fbcda | 1450 | int status; |
6714d8e8 | 1451 | struct dlm_query_join_request join_msg; |
0f71b7b4 JB |
1452 | struct dlm_query_join_packet packet; |
1453 | u32 join_resp; | |
6714d8e8 KH |
1454 | |
1455 | mlog(0, "querying node %d\n", node); | |
1456 | ||
1457 | memset(&join_msg, 0, sizeof(join_msg)); | |
1458 | join_msg.node_idx = dlm->node_num; | |
1459 | join_msg.name_len = strlen(dlm->name); | |
1460 | memcpy(join_msg.domain, dlm->name, join_msg.name_len); | |
d24fbcda JB |
1461 | join_msg.dlm_proto = dlm->dlm_locking_proto; |
1462 | join_msg.fs_proto = dlm->fs_locking_proto; | |
6714d8e8 | 1463 | |
1faf2894 SE |
1464 | /* copy live node map to join message */ |
1465 | byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES); | |
1466 | ||
6714d8e8 | 1467 | status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg, |
a5196ec5 | 1468 | sizeof(join_msg), node, &join_resp); |
6714d8e8 | 1469 | if (status < 0 && status != -ENOPROTOOPT) { |
a5196ec5 WW |
1470 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1471 | "node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, | |
1472 | node); | |
6714d8e8 KH |
1473 | goto bail; |
1474 | } | |
0f71b7b4 | 1475 | dlm_query_join_wire_to_packet(join_resp, &packet); |
6714d8e8 KH |
1476 | |
1477 | /* -ENOPROTOOPT from the net code means the other side isn't | |
1478 | listening for our message type -- that's fine, it means | |
1479 | his dlm isn't up, so we can consider him a 'yes' but not | |
1480 | joined into the domain. */ | |
1481 | if (status == -ENOPROTOOPT) { | |
1482 | status = 0; | |
1483 | *response = JOIN_OK_NO_MAP; | |
0f71b7b4 JB |
1484 | } else if (packet.code == JOIN_DISALLOW || |
1485 | packet.code == JOIN_OK_NO_MAP) { | |
1486 | *response = packet.code; | |
1487 | } else if (packet.code == JOIN_PROTOCOL_MISMATCH) { | |
d24fbcda JB |
1488 | mlog(ML_NOTICE, |
1489 | "This node requested DLM locking protocol %u.%u and " | |
1490 | "filesystem locking protocol %u.%u. At least one of " | |
1491 | "the protocol versions on node %d is not compatible, " | |
1492 | "disconnecting\n", | |
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, | |
1497 | node); | |
1498 | status = -EPROTO; | |
0f71b7b4 JB |
1499 | *response = packet.code; |
1500 | } else if (packet.code == JOIN_OK) { | |
1501 | *response = packet.code; | |
d24fbcda | 1502 | /* Use the same locking protocol as the remote node */ |
0f71b7b4 JB |
1503 | dlm->dlm_locking_proto.pv_minor = packet.dlm_minor; |
1504 | dlm->fs_locking_proto.pv_minor = packet.fs_minor; | |
d24fbcda JB |
1505 | mlog(0, |
1506 | "Node %d responds JOIN_OK with DLM locking protocol " | |
1507 | "%u.%u and fs locking protocol %u.%u\n", | |
1508 | node, | |
1509 | dlm->dlm_locking_proto.pv_major, | |
1510 | dlm->dlm_locking_proto.pv_minor, | |
1511 | dlm->fs_locking_proto.pv_major, | |
1512 | dlm->fs_locking_proto.pv_minor); | |
6714d8e8 KH |
1513 | } else { |
1514 | status = -EINVAL; | |
d24fbcda | 1515 | mlog(ML_ERROR, "invalid response %d from node %u\n", |
0f71b7b4 | 1516 | packet.code, node); |
6714d8e8 KH |
1517 | } |
1518 | ||
1519 | mlog(0, "status %d, node %d response is %d\n", status, node, | |
0f71b7b4 | 1520 | *response); |
6714d8e8 KH |
1521 | |
1522 | bail: | |
1523 | return status; | |
1524 | } | |
1525 | ||
1526 | static int dlm_send_one_join_assert(struct dlm_ctxt *dlm, | |
1527 | unsigned int node) | |
1528 | { | |
1529 | int status; | |
1530 | struct dlm_assert_joined assert_msg; | |
1531 | ||
1532 | mlog(0, "Sending join assert to node %u\n", node); | |
1533 | ||
1534 | memset(&assert_msg, 0, sizeof(assert_msg)); | |
1535 | assert_msg.node_idx = dlm->node_num; | |
1536 | assert_msg.name_len = strlen(dlm->name); | |
1537 | memcpy(assert_msg.domain, dlm->name, assert_msg.name_len); | |
1538 | ||
1539 | status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1540 | &assert_msg, sizeof(assert_msg), node, | |
1541 | NULL); | |
1542 | if (status < 0) | |
a5196ec5 WW |
1543 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1544 | "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1545 | node); | |
6714d8e8 KH |
1546 | |
1547 | return status; | |
1548 | } | |
1549 | ||
1550 | static void dlm_send_join_asserts(struct dlm_ctxt *dlm, | |
1551 | unsigned long *node_map) | |
1552 | { | |
1553 | int status, node, live; | |
1554 | ||
1555 | status = 0; | |
1556 | node = -1; | |
1557 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, | |
1558 | node + 1)) < O2NM_MAX_NODES) { | |
1559 | if (node == dlm->node_num) | |
1560 | continue; | |
1561 | ||
1562 | do { | |
1563 | /* It is very important that this message be | |
1564 | * received so we spin until either the node | |
1565 | * has died or it gets the message. */ | |
1566 | status = dlm_send_one_join_assert(dlm, node); | |
1567 | ||
1568 | spin_lock(&dlm->spinlock); | |
1569 | live = test_bit(node, dlm->live_nodes_map); | |
1570 | spin_unlock(&dlm->spinlock); | |
1571 | ||
1572 | if (status) { | |
1573 | mlog(ML_ERROR, "Error return %d asserting " | |
1574 | "join on node %d\n", status, node); | |
1575 | ||
1576 | /* give us some time between errors... */ | |
1577 | if (live) | |
1578 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
1579 | } | |
1580 | } while (status && live); | |
1581 | } | |
1582 | } | |
1583 | ||
1584 | struct domain_join_ctxt { | |
1585 | unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1586 | unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1587 | }; | |
1588 | ||
1589 | static int dlm_should_restart_join(struct dlm_ctxt *dlm, | |
1590 | struct domain_join_ctxt *ctxt, | |
d24fbcda | 1591 | enum dlm_query_join_response_code response) |
6714d8e8 KH |
1592 | { |
1593 | int ret; | |
1594 | ||
1595 | if (response == JOIN_DISALLOW) { | |
1596 | mlog(0, "Latest response of disallow -- should restart\n"); | |
1597 | return 1; | |
1598 | } | |
1599 | ||
1600 | spin_lock(&dlm->spinlock); | |
1601 | /* For now, we restart the process if the node maps have | |
1602 | * changed at all */ | |
1603 | ret = memcmp(ctxt->live_map, dlm->live_nodes_map, | |
1604 | sizeof(dlm->live_nodes_map)); | |
1605 | spin_unlock(&dlm->spinlock); | |
1606 | ||
1607 | if (ret) | |
1608 | mlog(0, "Node maps changed -- should restart\n"); | |
1609 | ||
1610 | return ret; | |
1611 | } | |
1612 | ||
1613 | static int dlm_try_to_join_domain(struct dlm_ctxt *dlm) | |
1614 | { | |
1615 | int status = 0, tmpstat, node; | |
1616 | struct domain_join_ctxt *ctxt; | |
d24fbcda | 1617 | enum dlm_query_join_response_code response = JOIN_DISALLOW; |
6714d8e8 | 1618 | |
ef6b689b | 1619 | mlog(0, "%p", dlm); |
6714d8e8 | 1620 | |
cd861280 | 1621 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); |
6714d8e8 KH |
1622 | if (!ctxt) { |
1623 | status = -ENOMEM; | |
1624 | mlog_errno(status); | |
1625 | goto bail; | |
1626 | } | |
1627 | ||
1628 | /* group sem locking should work for us here -- we're already | |
1629 | * registered for heartbeat events so filling this should be | |
1630 | * atomic wrt getting those handlers called. */ | |
1631 | o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map)); | |
1632 | ||
1633 | spin_lock(&dlm->spinlock); | |
1634 | memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map)); | |
1635 | ||
1636 | __dlm_set_joining_node(dlm, dlm->node_num); | |
1637 | ||
1638 | spin_unlock(&dlm->spinlock); | |
1639 | ||
1640 | node = -1; | |
1641 | while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES, | |
1642 | node + 1)) < O2NM_MAX_NODES) { | |
1643 | if (node == dlm->node_num) | |
1644 | continue; | |
1645 | ||
1646 | status = dlm_request_join(dlm, node, &response); | |
1647 | if (status < 0) { | |
1648 | mlog_errno(status); | |
1649 | goto bail; | |
1650 | } | |
1651 | ||
1652 | /* Ok, either we got a response or the node doesn't have a | |
1653 | * dlm up. */ | |
1654 | if (response == JOIN_OK) | |
1655 | set_bit(node, ctxt->yes_resp_map); | |
1656 | ||
1657 | if (dlm_should_restart_join(dlm, ctxt, response)) { | |
1658 | status = -EAGAIN; | |
1659 | goto bail; | |
1660 | } | |
1661 | } | |
1662 | ||
1663 | mlog(0, "Yay, done querying nodes!\n"); | |
1664 | ||
1665 | /* Yay, everyone agree's we can join the domain. My domain is | |
1666 | * comprised of all nodes who were put in the | |
1667 | * yes_resp_map. Copy that into our domain map and send a join | |
1668 | * assert message to clean up everyone elses state. */ | |
1669 | spin_lock(&dlm->spinlock); | |
1670 | memcpy(dlm->domain_map, ctxt->yes_resp_map, | |
1671 | sizeof(ctxt->yes_resp_map)); | |
1672 | set_bit(dlm->node_num, dlm->domain_map); | |
1673 | spin_unlock(&dlm->spinlock); | |
1674 | ||
18cfdf1b | 1675 | /* Support for global heartbeat and node info was added in 1.1 */ |
4da6dc29 SM |
1676 | if (dlm->dlm_locking_proto.pv_major > 1 || |
1677 | dlm->dlm_locking_proto.pv_minor > 0) { | |
18cfdf1b SM |
1678 | status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map); |
1679 | if (status) { | |
1680 | mlog_errno(status); | |
1681 | goto bail; | |
1682 | } | |
ea203441 SM |
1683 | status = dlm_send_regions(dlm, ctxt->yes_resp_map); |
1684 | if (status) { | |
1685 | mlog_errno(status); | |
1686 | goto bail; | |
1687 | } | |
1688 | } | |
1689 | ||
6714d8e8 KH |
1690 | dlm_send_join_asserts(dlm, ctxt->yes_resp_map); |
1691 | ||
1692 | /* Joined state *must* be set before the joining node | |
1693 | * information, otherwise the query_join handler may read no | |
1694 | * current joiner but a state of NEW and tell joining nodes | |
1695 | * we're not in the domain. */ | |
1696 | spin_lock(&dlm_domain_lock); | |
1697 | dlm->dlm_state = DLM_CTXT_JOINED; | |
1698 | dlm->num_joins++; | |
1699 | spin_unlock(&dlm_domain_lock); | |
1700 | ||
1701 | bail: | |
1702 | spin_lock(&dlm->spinlock); | |
1703 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
1704 | if (!status) | |
1705 | __dlm_print_nodes(dlm); | |
1706 | spin_unlock(&dlm->spinlock); | |
1707 | ||
1708 | if (ctxt) { | |
1709 | /* Do we need to send a cancel message to any nodes? */ | |
1710 | if (status < 0) { | |
1711 | tmpstat = dlm_send_join_cancels(dlm, | |
1712 | ctxt->yes_resp_map, | |
1713 | sizeof(ctxt->yes_resp_map)); | |
1714 | if (tmpstat < 0) | |
1715 | mlog_errno(tmpstat); | |
1716 | } | |
1717 | kfree(ctxt); | |
1718 | } | |
1719 | ||
1720 | mlog(0, "returning %d\n", status); | |
1721 | return status; | |
1722 | } | |
1723 | ||
1724 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm) | |
1725 | { | |
58a3158a SM |
1726 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up); |
1727 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down); | |
6714d8e8 KH |
1728 | o2net_unregister_handler_list(&dlm->dlm_domain_handlers); |
1729 | } | |
1730 | ||
1731 | static int dlm_register_domain_handlers(struct dlm_ctxt *dlm) | |
1732 | { | |
1733 | int status; | |
1734 | ||
1735 | mlog(0, "registering handlers.\n"); | |
1736 | ||
1737 | o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB, | |
1738 | dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI); | |
58a3158a | 1739 | status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down); |
6714d8e8 KH |
1740 | if (status) |
1741 | goto bail; | |
1742 | ||
1743 | o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB, | |
1744 | dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI); | |
58a3158a | 1745 | status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up); |
6714d8e8 KH |
1746 | if (status) |
1747 | goto bail; | |
1748 | ||
1749 | status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key, | |
1750 | sizeof(struct dlm_master_request), | |
1751 | dlm_master_request_handler, | |
d74c9803 | 1752 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1753 | if (status) |
1754 | goto bail; | |
1755 | ||
1756 | status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key, | |
1757 | sizeof(struct dlm_assert_master), | |
1758 | dlm_assert_master_handler, | |
3b8118cf KH |
1759 | dlm, dlm_assert_master_post_handler, |
1760 | &dlm->dlm_domain_handlers); | |
6714d8e8 KH |
1761 | if (status) |
1762 | goto bail; | |
1763 | ||
1764 | status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key, | |
1765 | sizeof(struct dlm_create_lock), | |
1766 | dlm_create_lock_handler, | |
d74c9803 | 1767 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1768 | if (status) |
1769 | goto bail; | |
1770 | ||
1771 | status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key, | |
1772 | DLM_CONVERT_LOCK_MAX_LEN, | |
1773 | dlm_convert_lock_handler, | |
d74c9803 | 1774 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1775 | if (status) |
1776 | goto bail; | |
1777 | ||
1778 | status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key, | |
1779 | DLM_UNLOCK_LOCK_MAX_LEN, | |
1780 | dlm_unlock_lock_handler, | |
d74c9803 | 1781 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1782 | if (status) |
1783 | goto bail; | |
1784 | ||
1785 | status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key, | |
1786 | DLM_PROXY_AST_MAX_LEN, | |
1787 | dlm_proxy_ast_handler, | |
d74c9803 | 1788 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1789 | if (status) |
1790 | goto bail; | |
1791 | ||
1792 | status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key, | |
1793 | sizeof(struct dlm_exit_domain), | |
1794 | dlm_exit_domain_handler, | |
d74c9803 | 1795 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1796 | if (status) |
1797 | goto bail; | |
1798 | ||
ba2bf218 KH |
1799 | status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key, |
1800 | sizeof(struct dlm_deref_lockres), | |
1801 | dlm_deref_lockres_handler, | |
d74c9803 | 1802 | dlm, NULL, &dlm->dlm_domain_handlers); |
ba2bf218 KH |
1803 | if (status) |
1804 | goto bail; | |
1805 | ||
6714d8e8 KH |
1806 | status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key, |
1807 | sizeof(struct dlm_migrate_request), | |
1808 | dlm_migrate_request_handler, | |
d74c9803 | 1809 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1810 | if (status) |
1811 | goto bail; | |
1812 | ||
1813 | status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key, | |
1814 | DLM_MIG_LOCKRES_MAX_LEN, | |
1815 | dlm_mig_lockres_handler, | |
d74c9803 | 1816 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1817 | if (status) |
1818 | goto bail; | |
1819 | ||
1820 | status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key, | |
1821 | sizeof(struct dlm_master_requery), | |
1822 | dlm_master_requery_handler, | |
d74c9803 | 1823 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1824 | if (status) |
1825 | goto bail; | |
1826 | ||
1827 | status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key, | |
1828 | sizeof(struct dlm_lock_request), | |
1829 | dlm_request_all_locks_handler, | |
d74c9803 | 1830 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1831 | if (status) |
1832 | goto bail; | |
1833 | ||
1834 | status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key, | |
1835 | sizeof(struct dlm_reco_data_done), | |
1836 | dlm_reco_data_done_handler, | |
d74c9803 | 1837 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1838 | if (status) |
1839 | goto bail; | |
1840 | ||
1841 | status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key, | |
1842 | sizeof(struct dlm_begin_reco), | |
1843 | dlm_begin_reco_handler, | |
d74c9803 | 1844 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1845 | if (status) |
1846 | goto bail; | |
1847 | ||
1848 | status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key, | |
1849 | sizeof(struct dlm_finalize_reco), | |
1850 | dlm_finalize_reco_handler, | |
d74c9803 | 1851 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1852 | if (status) |
1853 | goto bail; | |
1854 | ||
bddefdee SM |
1855 | status = o2net_register_handler(DLM_BEGIN_EXIT_DOMAIN_MSG, dlm->key, |
1856 | sizeof(struct dlm_exit_domain), | |
1857 | dlm_begin_exit_domain_handler, | |
1858 | dlm, NULL, &dlm->dlm_domain_handlers); | |
1859 | if (status) | |
1860 | goto bail; | |
1861 | ||
6714d8e8 KH |
1862 | bail: |
1863 | if (status) | |
1864 | dlm_unregister_domain_handlers(dlm); | |
1865 | ||
1866 | return status; | |
1867 | } | |
1868 | ||
1869 | static int dlm_join_domain(struct dlm_ctxt *dlm) | |
1870 | { | |
1871 | int status; | |
0dd82141 SM |
1872 | unsigned int backoff; |
1873 | unsigned int total_backoff = 0; | |
6714d8e8 KH |
1874 | |
1875 | BUG_ON(!dlm); | |
1876 | ||
1877 | mlog(0, "Join domain %s\n", dlm->name); | |
1878 | ||
1879 | status = dlm_register_domain_handlers(dlm); | |
1880 | if (status) { | |
1881 | mlog_errno(status); | |
1882 | goto bail; | |
1883 | } | |
1884 | ||
007dce53 SM |
1885 | status = dlm_debug_init(dlm); |
1886 | if (status < 0) { | |
1887 | mlog_errno(status); | |
1888 | goto bail; | |
1889 | } | |
1890 | ||
6714d8e8 KH |
1891 | status = dlm_launch_thread(dlm); |
1892 | if (status < 0) { | |
1893 | mlog_errno(status); | |
1894 | goto bail; | |
1895 | } | |
1896 | ||
1897 | status = dlm_launch_recovery_thread(dlm); | |
1898 | if (status < 0) { | |
1899 | mlog_errno(status); | |
1900 | goto bail; | |
1901 | } | |
1902 | ||
3156d267 KH |
1903 | dlm->dlm_worker = create_singlethread_workqueue("dlm_wq"); |
1904 | if (!dlm->dlm_worker) { | |
1905 | status = -ENOMEM; | |
1906 | mlog_errno(status); | |
1907 | goto bail; | |
1908 | } | |
1909 | ||
6714d8e8 | 1910 | do { |
6714d8e8 KH |
1911 | status = dlm_try_to_join_domain(dlm); |
1912 | ||
1913 | /* If we're racing another node to the join, then we | |
1914 | * need to back off temporarily and let them | |
1915 | * complete. */ | |
0dd82141 | 1916 | #define DLM_JOIN_TIMEOUT_MSECS 90000 |
6714d8e8 KH |
1917 | if (status == -EAGAIN) { |
1918 | if (signal_pending(current)) { | |
1919 | status = -ERESTARTSYS; | |
1920 | goto bail; | |
1921 | } | |
1922 | ||
0dd82141 SM |
1923 | if (total_backoff > |
1924 | msecs_to_jiffies(DLM_JOIN_TIMEOUT_MSECS)) { | |
1925 | status = -ERESTARTSYS; | |
1926 | mlog(ML_NOTICE, "Timed out joining dlm domain " | |
1927 | "%s after %u msecs\n", dlm->name, | |
1928 | jiffies_to_msecs(total_backoff)); | |
1929 | goto bail; | |
1930 | } | |
1931 | ||
6714d8e8 KH |
1932 | /* |
1933 | * <chip> After you! | |
1934 | * <dale> No, after you! | |
1935 | * <chip> I insist! | |
1936 | * <dale> But you first! | |
1937 | * ... | |
1938 | */ | |
1939 | backoff = (unsigned int)(jiffies & 0x3); | |
1940 | backoff *= DLM_DOMAIN_BACKOFF_MS; | |
0dd82141 | 1941 | total_backoff += backoff; |
6714d8e8 KH |
1942 | mlog(0, "backoff %d\n", backoff); |
1943 | msleep(backoff); | |
1944 | } | |
1945 | } while (status == -EAGAIN); | |
1946 | ||
1947 | if (status < 0) { | |
1948 | mlog_errno(status); | |
1949 | goto bail; | |
1950 | } | |
1951 | ||
1952 | status = 0; | |
1953 | bail: | |
1954 | wake_up(&dlm_domain_events); | |
1955 | ||
1956 | if (status) { | |
1957 | dlm_unregister_domain_handlers(dlm); | |
007dce53 | 1958 | dlm_debug_shutdown(dlm); |
6714d8e8 KH |
1959 | dlm_complete_thread(dlm); |
1960 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 1961 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
1962 | } |
1963 | ||
1964 | return status; | |
1965 | } | |
1966 | ||
1967 | static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain, | |
1968 | u32 key) | |
1969 | { | |
1970 | int i; | |
6325b4a2 | 1971 | int ret; |
6714d8e8 KH |
1972 | struct dlm_ctxt *dlm = NULL; |
1973 | ||
cd861280 | 1974 | dlm = kzalloc(sizeof(*dlm), GFP_KERNEL); |
6714d8e8 KH |
1975 | if (!dlm) { |
1976 | mlog_errno(-ENOMEM); | |
1977 | goto leave; | |
1978 | } | |
1979 | ||
316ce2ba | 1980 | dlm->name = kstrdup(domain, GFP_KERNEL); |
6714d8e8 KH |
1981 | if (dlm->name == NULL) { |
1982 | mlog_errno(-ENOMEM); | |
1983 | kfree(dlm); | |
1984 | dlm = NULL; | |
1985 | goto leave; | |
1986 | } | |
1987 | ||
03d864c0 | 1988 | dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES); |
81f2094a | 1989 | if (!dlm->lockres_hash) { |
6714d8e8 KH |
1990 | mlog_errno(-ENOMEM); |
1991 | kfree(dlm->name); | |
1992 | kfree(dlm); | |
1993 | dlm = NULL; | |
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) { | |
2003 | mlog_errno(-ENOMEM); | |
2004 | dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES); | |
2005 | kfree(dlm->name); | |
2006 | kfree(dlm); | |
2007 | dlm = NULL; | |
2008 | goto leave; | |
2009 | } | |
2010 | ||
2011 | for (i = 0; i < DLM_HASH_BUCKETS; i++) | |
2012 | INIT_HLIST_HEAD(dlm_master_hash(dlm, i)); | |
2013 | ||
6714d8e8 KH |
2014 | dlm->key = key; |
2015 | dlm->node_num = o2nm_this_node(); | |
2016 | ||
6325b4a2 SM |
2017 | ret = dlm_create_debugfs_subroot(dlm); |
2018 | if (ret < 0) { | |
e2b66ddc | 2019 | dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES); |
6325b4a2 SM |
2020 | dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES); |
2021 | kfree(dlm->name); | |
2022 | kfree(dlm); | |
2023 | dlm = NULL; | |
2024 | goto leave; | |
2025 | } | |
2026 | ||
6714d8e8 KH |
2027 | spin_lock_init(&dlm->spinlock); |
2028 | spin_lock_init(&dlm->master_lock); | |
2029 | spin_lock_init(&dlm->ast_lock); | |
b0d4f817 | 2030 | spin_lock_init(&dlm->track_lock); |
6714d8e8 KH |
2031 | INIT_LIST_HEAD(&dlm->list); |
2032 | INIT_LIST_HEAD(&dlm->dirty_list); | |
2033 | INIT_LIST_HEAD(&dlm->reco.resources); | |
2034 | INIT_LIST_HEAD(&dlm->reco.received); | |
2035 | INIT_LIST_HEAD(&dlm->reco.node_data); | |
2036 | INIT_LIST_HEAD(&dlm->purge_list); | |
2037 | INIT_LIST_HEAD(&dlm->dlm_domain_handlers); | |
29576f8b | 2038 | INIT_LIST_HEAD(&dlm->tracking_list); |
6714d8e8 KH |
2039 | dlm->reco.state = 0; |
2040 | ||
2041 | INIT_LIST_HEAD(&dlm->pending_asts); | |
2042 | INIT_LIST_HEAD(&dlm->pending_basts); | |
2043 | ||
2044 | mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n", | |
2045 | dlm->recovery_map, &(dlm->recovery_map[0])); | |
2046 | ||
2047 | memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map)); | |
2048 | memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map)); | |
2049 | memset(dlm->domain_map, 0, sizeof(dlm->domain_map)); | |
2050 | ||
2051 | dlm->dlm_thread_task = NULL; | |
2052 | dlm->dlm_reco_thread_task = NULL; | |
3156d267 | 2053 | dlm->dlm_worker = NULL; |
6714d8e8 KH |
2054 | init_waitqueue_head(&dlm->dlm_thread_wq); |
2055 | init_waitqueue_head(&dlm->dlm_reco_thread_wq); | |
2056 | init_waitqueue_head(&dlm->reco.event); | |
2057 | init_waitqueue_head(&dlm->ast_wq); | |
2058 | init_waitqueue_head(&dlm->migration_wq); | |
6714d8e8 KH |
2059 | INIT_LIST_HEAD(&dlm->mle_hb_events); |
2060 | ||
2061 | dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN; | |
2062 | init_waitqueue_head(&dlm->dlm_join_events); | |
2063 | ||
2064 | dlm->reco.new_master = O2NM_INVALID_NODE_NUM; | |
2065 | dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; | |
6714d8e8 | 2066 | |
6800791a SM |
2067 | atomic_set(&dlm->res_tot_count, 0); |
2068 | atomic_set(&dlm->res_cur_count, 0); | |
2041d8fd SM |
2069 | for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) { |
2070 | atomic_set(&dlm->mle_tot_count[i], 0); | |
2071 | atomic_set(&dlm->mle_cur_count[i], 0); | |
2072 | } | |
2073 | ||
6714d8e8 KH |
2074 | spin_lock_init(&dlm->work_lock); |
2075 | INIT_LIST_HEAD(&dlm->work_list); | |
c4028958 | 2076 | INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work); |
6714d8e8 KH |
2077 | |
2078 | kref_init(&dlm->dlm_refs); | |
2079 | dlm->dlm_state = DLM_CTXT_NEW; | |
2080 | ||
2081 | INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks); | |
2082 | ||
2083 | mlog(0, "context init: refcount %u\n", | |
2084 | atomic_read(&dlm->dlm_refs.refcount)); | |
2085 | ||
2086 | leave: | |
2087 | return dlm; | |
2088 | } | |
2089 | ||
2090 | /* | |
d24fbcda JB |
2091 | * Compare a requested locking protocol version against the current one. |
2092 | * | |
2093 | * If the major numbers are different, they are incompatible. | |
2094 | * If the current minor is greater than the request, they are incompatible. | |
2095 | * If the current minor is less than or equal to the request, they are | |
2096 | * compatible, and the requester should run at the current minor version. | |
2097 | */ | |
2098 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, | |
2099 | struct dlm_protocol_version *request) | |
2100 | { | |
2101 | if (existing->pv_major != request->pv_major) | |
2102 | return 1; | |
2103 | ||
2104 | if (existing->pv_minor > request->pv_minor) | |
2105 | return 1; | |
2106 | ||
2107 | if (existing->pv_minor < request->pv_minor) | |
2108 | request->pv_minor = existing->pv_minor; | |
2109 | ||
2110 | return 0; | |
2111 | } | |
2112 | ||
2113 | /* | |
2114 | * dlm_register_domain: one-time setup per "domain". | |
2115 | * | |
2116 | * The filesystem passes in the requested locking version via proto. | |
2117 | * If registration was successful, proto will contain the negotiated | |
2118 | * locking protocol. | |
6714d8e8 KH |
2119 | */ |
2120 | struct dlm_ctxt * dlm_register_domain(const char *domain, | |
d24fbcda JB |
2121 | u32 key, |
2122 | struct dlm_protocol_version *fs_proto) | |
6714d8e8 KH |
2123 | { |
2124 | int ret; | |
2125 | struct dlm_ctxt *dlm = NULL; | |
2126 | struct dlm_ctxt *new_ctxt = NULL; | |
2127 | ||
e372357b | 2128 | if (strlen(domain) >= O2NM_MAX_NAME_LEN) { |
6714d8e8 KH |
2129 | ret = -ENAMETOOLONG; |
2130 | mlog(ML_ERROR, "domain name length too long\n"); | |
2131 | goto leave; | |
2132 | } | |
2133 | ||
2134 | if (!o2hb_check_local_node_heartbeating()) { | |
2135 | mlog(ML_ERROR, "the local node has not been configured, or is " | |
2136 | "not heartbeating\n"); | |
2137 | ret = -EPROTO; | |
2138 | goto leave; | |
2139 | } | |
2140 | ||
2141 | mlog(0, "register called for domain \"%s\"\n", domain); | |
2142 | ||
2143 | retry: | |
2144 | dlm = NULL; | |
2145 | if (signal_pending(current)) { | |
2146 | ret = -ERESTARTSYS; | |
2147 | mlog_errno(ret); | |
2148 | goto leave; | |
2149 | } | |
2150 | ||
2151 | spin_lock(&dlm_domain_lock); | |
2152 | ||
2153 | dlm = __dlm_lookup_domain(domain); | |
2154 | if (dlm) { | |
2155 | if (dlm->dlm_state != DLM_CTXT_JOINED) { | |
2156 | spin_unlock(&dlm_domain_lock); | |
2157 | ||
2158 | mlog(0, "This ctxt is not joined yet!\n"); | |
2159 | wait_event_interruptible(dlm_domain_events, | |
2160 | dlm_wait_on_domain_helper( | |
2161 | domain)); | |
2162 | goto retry; | |
2163 | } | |
2164 | ||
d24fbcda | 2165 | if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) { |
6469272c | 2166 | spin_unlock(&dlm_domain_lock); |
d24fbcda JB |
2167 | mlog(ML_ERROR, |
2168 | "Requested locking protocol version is not " | |
2169 | "compatible with already registered domain " | |
2170 | "\"%s\"\n", domain); | |
2171 | ret = -EPROTO; | |
2172 | goto leave; | |
2173 | } | |
2174 | ||
6714d8e8 KH |
2175 | __dlm_get(dlm); |
2176 | dlm->num_joins++; | |
2177 | ||
2178 | spin_unlock(&dlm_domain_lock); | |
2179 | ||
2180 | ret = 0; | |
2181 | goto leave; | |
2182 | } | |
2183 | ||
2184 | /* doesn't exist */ | |
2185 | if (!new_ctxt) { | |
2186 | spin_unlock(&dlm_domain_lock); | |
2187 | ||
2188 | new_ctxt = dlm_alloc_ctxt(domain, key); | |
2189 | if (new_ctxt) | |
2190 | goto retry; | |
2191 | ||
2192 | ret = -ENOMEM; | |
2193 | mlog_errno(ret); | |
2194 | goto leave; | |
2195 | } | |
2196 | ||
2197 | /* a little variable switch-a-roo here... */ | |
2198 | dlm = new_ctxt; | |
2199 | new_ctxt = NULL; | |
2200 | ||
2201 | /* add the new domain */ | |
2202 | list_add_tail(&dlm->list, &dlm_domains); | |
2203 | spin_unlock(&dlm_domain_lock); | |
2204 | ||
d24fbcda JB |
2205 | /* |
2206 | * Pass the locking protocol version into the join. If the join | |
2207 | * succeeds, it will have the negotiated protocol set. | |
2208 | */ | |
2209 | dlm->dlm_locking_proto = dlm_protocol; | |
2210 | dlm->fs_locking_proto = *fs_proto; | |
2211 | ||
6714d8e8 KH |
2212 | ret = dlm_join_domain(dlm); |
2213 | if (ret) { | |
2214 | mlog_errno(ret); | |
2215 | dlm_put(dlm); | |
2216 | goto leave; | |
2217 | } | |
2218 | ||
d24fbcda JB |
2219 | /* Tell the caller what locking protocol we negotiated */ |
2220 | *fs_proto = dlm->fs_locking_proto; | |
2221 | ||
6714d8e8 KH |
2222 | ret = 0; |
2223 | leave: | |
2224 | if (new_ctxt) | |
2225 | dlm_free_ctxt_mem(new_ctxt); | |
2226 | ||
2227 | if (ret < 0) | |
2228 | dlm = ERR_PTR(ret); | |
2229 | ||
2230 | return dlm; | |
2231 | } | |
2232 | EXPORT_SYMBOL_GPL(dlm_register_domain); | |
2233 | ||
2234 | static LIST_HEAD(dlm_join_handlers); | |
2235 | ||
2236 | static void dlm_unregister_net_handlers(void) | |
2237 | { | |
2238 | o2net_unregister_handler_list(&dlm_join_handlers); | |
2239 | } | |
2240 | ||
2241 | static int dlm_register_net_handlers(void) | |
2242 | { | |
2243 | int status = 0; | |
2244 | ||
2245 | status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, | |
2246 | sizeof(struct dlm_query_join_request), | |
2247 | dlm_query_join_handler, | |
d74c9803 | 2248 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
2249 | if (status) |
2250 | goto bail; | |
2251 | ||
2252 | status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
2253 | sizeof(struct dlm_assert_joined), | |
2254 | dlm_assert_joined_handler, | |
d74c9803 | 2255 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
2256 | if (status) |
2257 | goto bail; | |
2258 | ||
2259 | status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
2260 | sizeof(struct dlm_cancel_join), | |
2261 | dlm_cancel_join_handler, | |
d74c9803 | 2262 | NULL, NULL, &dlm_join_handlers); |
ea203441 SM |
2263 | if (status) |
2264 | goto bail; | |
2265 | ||
2266 | status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY, | |
2267 | sizeof(struct dlm_query_region), | |
2268 | dlm_query_region_handler, | |
2269 | NULL, NULL, &dlm_join_handlers); | |
6714d8e8 | 2270 | |
18cfdf1b SM |
2271 | if (status) |
2272 | goto bail; | |
2273 | ||
2274 | status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY, | |
2275 | sizeof(struct dlm_query_nodeinfo), | |
2276 | dlm_query_nodeinfo_handler, | |
2277 | NULL, NULL, &dlm_join_handlers); | |
6714d8e8 KH |
2278 | bail: |
2279 | if (status < 0) | |
2280 | dlm_unregister_net_handlers(); | |
2281 | ||
2282 | return status; | |
2283 | } | |
2284 | ||
2285 | /* Domain eviction callback handling. | |
2286 | * | |
2287 | * The file system requires notification of node death *before* the | |
2288 | * dlm completes it's recovery work, otherwise it may be able to | |
2289 | * acquire locks on resources requiring recovery. Since the dlm can | |
2290 | * evict a node from it's domain *before* heartbeat fires, a similar | |
2291 | * mechanism is required. */ | |
2292 | ||
2293 | /* Eviction is not expected to happen often, so a per-domain lock is | |
2294 | * not necessary. Eviction callbacks are allowed to sleep for short | |
2295 | * periods of time. */ | |
2296 | static DECLARE_RWSEM(dlm_callback_sem); | |
2297 | ||
2298 | void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm, | |
2299 | int node_num) | |
2300 | { | |
2301 | struct list_head *iter; | |
2302 | struct dlm_eviction_cb *cb; | |
2303 | ||
2304 | down_read(&dlm_callback_sem); | |
2305 | list_for_each(iter, &dlm->dlm_eviction_callbacks) { | |
2306 | cb = list_entry(iter, struct dlm_eviction_cb, ec_item); | |
2307 | ||
2308 | cb->ec_func(node_num, cb->ec_data); | |
2309 | } | |
2310 | up_read(&dlm_callback_sem); | |
2311 | } | |
2312 | ||
2313 | void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb, | |
2314 | dlm_eviction_func *f, | |
2315 | void *data) | |
2316 | { | |
2317 | INIT_LIST_HEAD(&cb->ec_item); | |
2318 | cb->ec_func = f; | |
2319 | cb->ec_data = data; | |
2320 | } | |
2321 | EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb); | |
2322 | ||
2323 | void dlm_register_eviction_cb(struct dlm_ctxt *dlm, | |
2324 | struct dlm_eviction_cb *cb) | |
2325 | { | |
2326 | down_write(&dlm_callback_sem); | |
2327 | list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks); | |
2328 | up_write(&dlm_callback_sem); | |
2329 | } | |
2330 | EXPORT_SYMBOL_GPL(dlm_register_eviction_cb); | |
2331 | ||
2332 | void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb) | |
2333 | { | |
2334 | down_write(&dlm_callback_sem); | |
2335 | list_del_init(&cb->ec_item); | |
2336 | up_write(&dlm_callback_sem); | |
2337 | } | |
2338 | EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb); | |
2339 | ||
2340 | static int __init dlm_init(void) | |
2341 | { | |
2342 | int status; | |
2343 | ||
2344 | dlm_print_version(); | |
2345 | ||
2346 | status = dlm_init_mle_cache(); | |
12eb0035 SM |
2347 | if (status) { |
2348 | mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n"); | |
724bdca9 SM |
2349 | goto error; |
2350 | } | |
2351 | ||
2352 | status = dlm_init_master_caches(); | |
2353 | if (status) { | |
2354 | mlog(ML_ERROR, "Could not create o2dlm_lockres and " | |
2355 | "o2dlm_lockname slabcaches\n"); | |
2356 | goto error; | |
2357 | } | |
2358 | ||
2359 | status = dlm_init_lock_cache(); | |
2360 | if (status) { | |
2361 | mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n"); | |
2362 | goto error; | |
12eb0035 | 2363 | } |
6714d8e8 KH |
2364 | |
2365 | status = dlm_register_net_handlers(); | |
2366 | if (status) { | |
724bdca9 SM |
2367 | mlog(ML_ERROR, "Unable to register network handlers\n"); |
2368 | goto error; | |
6714d8e8 KH |
2369 | } |
2370 | ||
6325b4a2 SM |
2371 | status = dlm_create_debugfs_root(); |
2372 | if (status) | |
2373 | goto error; | |
2374 | ||
6714d8e8 | 2375 | return 0; |
724bdca9 | 2376 | error: |
6325b4a2 | 2377 | dlm_unregister_net_handlers(); |
724bdca9 SM |
2378 | dlm_destroy_lock_cache(); |
2379 | dlm_destroy_master_caches(); | |
2380 | dlm_destroy_mle_cache(); | |
2381 | return -1; | |
6714d8e8 KH |
2382 | } |
2383 | ||
2384 | static void __exit dlm_exit (void) | |
2385 | { | |
6325b4a2 | 2386 | dlm_destroy_debugfs_root(); |
6714d8e8 | 2387 | dlm_unregister_net_handlers(); |
724bdca9 SM |
2388 | dlm_destroy_lock_cache(); |
2389 | dlm_destroy_master_caches(); | |
6714d8e8 KH |
2390 | dlm_destroy_mle_cache(); |
2391 | } | |
2392 | ||
2393 | MODULE_AUTHOR("Oracle"); | |
2394 | MODULE_LICENSE("GPL"); | |
2395 | ||
2396 | module_init(dlm_init); | |
2397 | module_exit(dlm_exit); |