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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 | |
60d663cb | 135 | * New in version 1.3: |
136 | * - Message DLM_DEREF_LOCKRES_DONE added to inform non-master that the | |
137 | * refmap is cleared | |
d24fbcda JB |
138 | */ |
139 | static const struct dlm_protocol_version dlm_protocol = { | |
140 | .pv_major = 1, | |
60d663cb | 141 | .pv_minor = 3, |
d24fbcda JB |
142 | }; |
143 | ||
6714d8e8 KH |
144 | #define DLM_DOMAIN_BACKOFF_MS 200 |
145 | ||
d74c9803 KH |
146 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
147 | void **ret_data); | |
148 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, | |
149 | void **ret_data); | |
150 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, | |
151 | void **ret_data); | |
ea203441 SM |
152 | static int dlm_query_region_handler(struct o2net_msg *msg, u32 len, |
153 | void *data, void **ret_data); | |
d74c9803 KH |
154 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
155 | void **ret_data); | |
d24fbcda JB |
156 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, |
157 | struct dlm_protocol_version *request); | |
6714d8e8 KH |
158 | |
159 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm); | |
160 | ||
e9f0b6a6 | 161 | void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) |
6714d8e8 | 162 | { |
e9f0b6a6 SM |
163 | if (hlist_unhashed(&res->hash_node)) |
164 | return; | |
165 | ||
166 | mlog(0, "%s: Unhash res %.*s\n", dlm->name, res->lockname.len, | |
167 | res->lockname.name); | |
168 | hlist_del_init(&res->hash_node); | |
169 | dlm_lockres_put(res); | |
6714d8e8 KH |
170 | } |
171 | ||
e9f0b6a6 | 172 | void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) |
6714d8e8 | 173 | { |
81f2094a | 174 | struct hlist_head *bucket; |
6714d8e8 KH |
175 | struct qstr *q; |
176 | ||
177 | assert_spin_locked(&dlm->spinlock); | |
178 | ||
179 | q = &res->lockname; | |
03d864c0 | 180 | bucket = dlm_lockres_hash(dlm, q->hash); |
6714d8e8 KH |
181 | |
182 | /* get a reference for our hashtable */ | |
183 | dlm_lockres_get(res); | |
184 | ||
81f2094a | 185 | hlist_add_head(&res->hash_node, bucket); |
e9f0b6a6 SM |
186 | |
187 | mlog(0, "%s: Hash res %.*s\n", dlm->name, res->lockname.len, | |
188 | res->lockname.name); | |
6714d8e8 KH |
189 | } |
190 | ||
ba2bf218 KH |
191 | struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm, |
192 | const char *name, | |
193 | unsigned int len, | |
194 | unsigned int hash) | |
6714d8e8 | 195 | { |
81f2094a | 196 | struct hlist_head *bucket; |
df53cd3b | 197 | struct dlm_lock_resource *res; |
6714d8e8 | 198 | |
ef6b689b | 199 | mlog(0, "%.*s\n", len, name); |
6714d8e8 KH |
200 | |
201 | assert_spin_locked(&dlm->spinlock); | |
202 | ||
03d864c0 DP |
203 | bucket = dlm_lockres_hash(dlm, hash); |
204 | ||
df53cd3b | 205 | hlist_for_each_entry(res, bucket, hash_node) { |
4198985f DP |
206 | if (res->lockname.name[0] != name[0]) |
207 | continue; | |
208 | if (unlikely(res->lockname.len != len)) | |
209 | continue; | |
210 | if (memcmp(res->lockname.name + 1, name + 1, len - 1)) | |
211 | continue; | |
212 | dlm_lockres_get(res); | |
213 | return res; | |
6714d8e8 | 214 | } |
4198985f | 215 | return NULL; |
6714d8e8 KH |
216 | } |
217 | ||
ba2bf218 KH |
218 | /* intended to be called by functions which do not care about lock |
219 | * resources which are being purged (most net _handler functions). | |
220 | * this will return NULL for any lock resource which is found but | |
221 | * currently in the process of dropping its mastery reference. | |
222 | * use __dlm_lookup_lockres_full when you need the lock resource | |
223 | * regardless (e.g. dlm_get_lock_resource) */ | |
224 | struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, | |
225 | const char *name, | |
226 | unsigned int len, | |
227 | unsigned int hash) | |
228 | { | |
229 | struct dlm_lock_resource *res = NULL; | |
230 | ||
ef6b689b | 231 | mlog(0, "%.*s\n", len, name); |
ba2bf218 KH |
232 | |
233 | assert_spin_locked(&dlm->spinlock); | |
234 | ||
235 | res = __dlm_lookup_lockres_full(dlm, name, len, hash); | |
236 | if (res) { | |
237 | spin_lock(&res->spinlock); | |
238 | if (res->state & DLM_LOCK_RES_DROPPING_REF) { | |
239 | spin_unlock(&res->spinlock); | |
240 | dlm_lockres_put(res); | |
241 | return NULL; | |
242 | } | |
243 | spin_unlock(&res->spinlock); | |
244 | } | |
245 | ||
246 | return res; | |
247 | } | |
248 | ||
6714d8e8 KH |
249 | struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, |
250 | const char *name, | |
251 | unsigned int len) | |
252 | { | |
253 | struct dlm_lock_resource *res; | |
a3d33291 | 254 | unsigned int hash = dlm_lockid_hash(name, len); |
6714d8e8 KH |
255 | |
256 | spin_lock(&dlm->spinlock); | |
a3d33291 | 257 | res = __dlm_lookup_lockres(dlm, name, len, hash); |
6714d8e8 KH |
258 | spin_unlock(&dlm->spinlock); |
259 | return res; | |
260 | } | |
261 | ||
262 | static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len) | |
263 | { | |
df53cd3b | 264 | struct dlm_ctxt *tmp; |
6714d8e8 KH |
265 | |
266 | assert_spin_locked(&dlm_domain_lock); | |
267 | ||
268 | /* tmp->name here is always NULL terminated, | |
269 | * but domain may not be! */ | |
df53cd3b | 270 | list_for_each_entry(tmp, &dlm_domains, list) { |
6714d8e8 KH |
271 | if (strlen(tmp->name) == len && |
272 | memcmp(tmp->name, domain, len)==0) | |
df53cd3b | 273 | return tmp; |
6714d8e8 KH |
274 | } |
275 | ||
df53cd3b | 276 | return NULL; |
6714d8e8 KH |
277 | } |
278 | ||
279 | /* For null terminated domain strings ONLY */ | |
280 | static struct dlm_ctxt * __dlm_lookup_domain(const char *domain) | |
281 | { | |
282 | assert_spin_locked(&dlm_domain_lock); | |
283 | ||
284 | return __dlm_lookup_domain_full(domain, strlen(domain)); | |
285 | } | |
286 | ||
287 | ||
288 | /* returns true on one of two conditions: | |
289 | * 1) the domain does not exist | |
290 | * 2) the domain exists and it's state is "joined" */ | |
291 | static int dlm_wait_on_domain_helper(const char *domain) | |
292 | { | |
293 | int ret = 0; | |
294 | struct dlm_ctxt *tmp = NULL; | |
295 | ||
296 | spin_lock(&dlm_domain_lock); | |
297 | ||
298 | tmp = __dlm_lookup_domain(domain); | |
299 | if (!tmp) | |
300 | ret = 1; | |
301 | else if (tmp->dlm_state == DLM_CTXT_JOINED) | |
302 | ret = 1; | |
303 | ||
304 | spin_unlock(&dlm_domain_lock); | |
305 | return ret; | |
306 | } | |
307 | ||
308 | static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm) | |
309 | { | |
6325b4a2 SM |
310 | dlm_destroy_debugfs_subroot(dlm); |
311 | ||
81f2094a | 312 | if (dlm->lockres_hash) |
03d864c0 | 313 | dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES); |
6714d8e8 | 314 | |
e2b66ddc SM |
315 | if (dlm->master_hash) |
316 | dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES); | |
317 | ||
d787ab09 | 318 | kfree(dlm->name); |
6714d8e8 KH |
319 | kfree(dlm); |
320 | } | |
321 | ||
322 | /* A little strange - this function will be called while holding | |
323 | * dlm_domain_lock and is expected to be holding it on the way out. We | |
324 | * will however drop and reacquire it multiple times */ | |
325 | static void dlm_ctxt_release(struct kref *kref) | |
326 | { | |
327 | struct dlm_ctxt *dlm; | |
328 | ||
329 | dlm = container_of(kref, struct dlm_ctxt, dlm_refs); | |
330 | ||
331 | BUG_ON(dlm->num_joins); | |
332 | BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED); | |
333 | ||
334 | /* we may still be in the list if we hit an error during join. */ | |
335 | list_del_init(&dlm->list); | |
336 | ||
337 | spin_unlock(&dlm_domain_lock); | |
338 | ||
339 | mlog(0, "freeing memory from domain %s\n", dlm->name); | |
340 | ||
341 | wake_up(&dlm_domain_events); | |
342 | ||
343 | dlm_free_ctxt_mem(dlm); | |
344 | ||
345 | spin_lock(&dlm_domain_lock); | |
346 | } | |
347 | ||
348 | void dlm_put(struct dlm_ctxt *dlm) | |
349 | { | |
350 | spin_lock(&dlm_domain_lock); | |
351 | kref_put(&dlm->dlm_refs, dlm_ctxt_release); | |
352 | spin_unlock(&dlm_domain_lock); | |
353 | } | |
354 | ||
355 | static void __dlm_get(struct dlm_ctxt *dlm) | |
356 | { | |
357 | kref_get(&dlm->dlm_refs); | |
358 | } | |
359 | ||
360 | /* given a questionable reference to a dlm object, gets a reference if | |
361 | * it can find it in the list, otherwise returns NULL in which case | |
362 | * you shouldn't trust your pointer. */ | |
363 | struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm) | |
364 | { | |
df53cd3b DF |
365 | struct dlm_ctxt *target; |
366 | struct dlm_ctxt *ret = NULL; | |
6714d8e8 KH |
367 | |
368 | spin_lock(&dlm_domain_lock); | |
369 | ||
df53cd3b | 370 | list_for_each_entry(target, &dlm_domains, list) { |
6714d8e8 KH |
371 | if (target == dlm) { |
372 | __dlm_get(target); | |
df53cd3b | 373 | ret = target; |
6714d8e8 KH |
374 | break; |
375 | } | |
6714d8e8 KH |
376 | } |
377 | ||
378 | spin_unlock(&dlm_domain_lock); | |
379 | ||
df53cd3b | 380 | return ret; |
6714d8e8 KH |
381 | } |
382 | ||
383 | int dlm_domain_fully_joined(struct dlm_ctxt *dlm) | |
384 | { | |
385 | int ret; | |
386 | ||
387 | spin_lock(&dlm_domain_lock); | |
388 | ret = (dlm->dlm_state == DLM_CTXT_JOINED) || | |
389 | (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN); | |
390 | spin_unlock(&dlm_domain_lock); | |
391 | ||
392 | return ret; | |
393 | } | |
394 | ||
3156d267 KH |
395 | static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm) |
396 | { | |
397 | if (dlm->dlm_worker) { | |
398 | flush_workqueue(dlm->dlm_worker); | |
399 | destroy_workqueue(dlm->dlm_worker); | |
400 | dlm->dlm_worker = NULL; | |
401 | } | |
402 | } | |
403 | ||
6714d8e8 KH |
404 | static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm) |
405 | { | |
406 | dlm_unregister_domain_handlers(dlm); | |
007dce53 | 407 | dlm_debug_shutdown(dlm); |
6714d8e8 KH |
408 | dlm_complete_thread(dlm); |
409 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 410 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
411 | |
412 | /* We've left the domain. Now we can take ourselves out of the | |
413 | * list and allow the kref stuff to help us free the | |
414 | * memory. */ | |
415 | spin_lock(&dlm_domain_lock); | |
416 | list_del_init(&dlm->list); | |
417 | spin_unlock(&dlm_domain_lock); | |
418 | ||
419 | /* Wake up anyone waiting for us to remove this domain */ | |
420 | wake_up(&dlm_domain_events); | |
421 | } | |
422 | ||
ba2bf218 | 423 | static int dlm_migrate_all_locks(struct dlm_ctxt *dlm) |
6714d8e8 | 424 | { |
ba2bf218 | 425 | int i, num, n, ret = 0; |
6714d8e8 | 426 | struct dlm_lock_resource *res; |
ba2bf218 KH |
427 | struct hlist_node *iter; |
428 | struct hlist_head *bucket; | |
429 | int dropped; | |
6714d8e8 KH |
430 | |
431 | mlog(0, "Migrating locks from domain %s\n", dlm->name); | |
ba2bf218 KH |
432 | |
433 | num = 0; | |
6714d8e8 | 434 | spin_lock(&dlm->spinlock); |
81f2094a | 435 | for (i = 0; i < DLM_HASH_BUCKETS; i++) { |
ba2bf218 KH |
436 | redo_bucket: |
437 | n = 0; | |
438 | bucket = dlm_lockres_hash(dlm, i); | |
439 | iter = bucket->first; | |
440 | while (iter) { | |
441 | n++; | |
442 | res = hlist_entry(iter, struct dlm_lock_resource, | |
443 | hash_node); | |
6714d8e8 | 444 | dlm_lockres_get(res); |
ba2bf218 KH |
445 | /* migrate, if necessary. this will drop the dlm |
446 | * spinlock and retake it if it does migration. */ | |
447 | dropped = dlm_empty_lockres(dlm, res); | |
448 | ||
449 | spin_lock(&res->spinlock); | |
66effd3c SM |
450 | if (dropped) |
451 | __dlm_lockres_calc_usage(dlm, res); | |
452 | else | |
453 | iter = res->hash_node.next; | |
ba2bf218 KH |
454 | spin_unlock(&res->spinlock); |
455 | ||
6714d8e8 | 456 | dlm_lockres_put(res); |
ba2bf218 | 457 | |
66effd3c SM |
458 | if (dropped) { |
459 | cond_resched_lock(&dlm->spinlock); | |
ba2bf218 | 460 | goto redo_bucket; |
66effd3c | 461 | } |
6714d8e8 | 462 | } |
0d01af6e | 463 | cond_resched_lock(&dlm->spinlock); |
ba2bf218 | 464 | num += n; |
6714d8e8 KH |
465 | } |
466 | spin_unlock(&dlm->spinlock); | |
ba2bf218 KH |
467 | wake_up(&dlm->dlm_thread_wq); |
468 | ||
469 | /* let the dlm thread take care of purging, keep scanning until | |
470 | * nothing remains in the hash */ | |
471 | if (num) { | |
472 | mlog(0, "%s: %d lock resources in hash last pass\n", | |
473 | dlm->name, num); | |
474 | ret = -EAGAIN; | |
475 | } | |
6714d8e8 | 476 | mlog(0, "DONE Migrating locks from domain %s\n", dlm->name); |
ba2bf218 | 477 | return ret; |
6714d8e8 KH |
478 | } |
479 | ||
480 | static int dlm_no_joining_node(struct dlm_ctxt *dlm) | |
481 | { | |
482 | int ret; | |
483 | ||
484 | spin_lock(&dlm->spinlock); | |
485 | ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN; | |
486 | spin_unlock(&dlm->spinlock); | |
487 | ||
488 | return ret; | |
489 | } | |
490 | ||
bddefdee SM |
491 | static int dlm_begin_exit_domain_handler(struct o2net_msg *msg, u32 len, |
492 | void *data, void **ret_data) | |
493 | { | |
494 | struct dlm_ctxt *dlm = data; | |
495 | unsigned int node; | |
496 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; | |
497 | ||
498 | if (!dlm_grab(dlm)) | |
499 | return 0; | |
500 | ||
501 | node = exit_msg->node_idx; | |
502 | mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm->name, node); | |
503 | ||
504 | spin_lock(&dlm->spinlock); | |
505 | set_bit(node, dlm->exit_domain_map); | |
506 | spin_unlock(&dlm->spinlock); | |
507 | ||
508 | dlm_put(dlm); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
6714d8e8 KH |
513 | static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm) |
514 | { | |
515 | /* Yikes, a double spinlock! I need domain_lock for the dlm | |
516 | * state and the dlm spinlock for join state... Sorry! */ | |
517 | again: | |
518 | spin_lock(&dlm_domain_lock); | |
519 | spin_lock(&dlm->spinlock); | |
520 | ||
521 | if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { | |
522 | mlog(0, "Node %d is joining, we wait on it.\n", | |
523 | dlm->joining_node); | |
524 | spin_unlock(&dlm->spinlock); | |
525 | spin_unlock(&dlm_domain_lock); | |
526 | ||
527 | wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm)); | |
528 | goto again; | |
529 | } | |
530 | ||
531 | dlm->dlm_state = DLM_CTXT_LEAVING; | |
532 | spin_unlock(&dlm->spinlock); | |
533 | spin_unlock(&dlm_domain_lock); | |
534 | } | |
535 | ||
536 | static void __dlm_print_nodes(struct dlm_ctxt *dlm) | |
537 | { | |
8decab3c | 538 | int node = -1, num = 0; |
6714d8e8 KH |
539 | |
540 | assert_spin_locked(&dlm->spinlock); | |
541 | ||
8decab3c | 542 | printk("( "); |
6714d8e8 KH |
543 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, |
544 | node + 1)) < O2NM_MAX_NODES) { | |
781ee3e2 | 545 | printk("%d ", node); |
8decab3c | 546 | ++num; |
6714d8e8 | 547 | } |
8decab3c | 548 | printk(") %u nodes\n", num); |
6714d8e8 KH |
549 | } |
550 | ||
d74c9803 KH |
551 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
552 | void **ret_data) | |
6714d8e8 KH |
553 | { |
554 | struct dlm_ctxt *dlm = data; | |
555 | unsigned int node; | |
556 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; | |
557 | ||
ef6b689b | 558 | mlog(0, "%p %u %p", msg, len, data); |
6714d8e8 KH |
559 | |
560 | if (!dlm_grab(dlm)) | |
561 | return 0; | |
562 | ||
563 | node = exit_msg->node_idx; | |
564 | ||
6714d8e8 KH |
565 | spin_lock(&dlm->spinlock); |
566 | clear_bit(node, dlm->domain_map); | |
bddefdee | 567 | clear_bit(node, dlm->exit_domain_map); |
8decab3c | 568 | printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s ", node, dlm->name); |
6714d8e8 KH |
569 | __dlm_print_nodes(dlm); |
570 | ||
571 | /* notify anything attached to the heartbeat events */ | |
572 | dlm_hb_event_notify_attached(dlm, node, 0); | |
573 | ||
574 | spin_unlock(&dlm->spinlock); | |
575 | ||
576 | dlm_put(dlm); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
bddefdee | 581 | static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, u32 msg_type, |
6714d8e8 KH |
582 | unsigned int node) |
583 | { | |
584 | int status; | |
585 | struct dlm_exit_domain leave_msg; | |
586 | ||
bddefdee SM |
587 | mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm->name, |
588 | msg_type, node); | |
6714d8e8 KH |
589 | |
590 | memset(&leave_msg, 0, sizeof(leave_msg)); | |
591 | leave_msg.node_idx = dlm->node_num; | |
592 | ||
bddefdee SM |
593 | status = o2net_send_message(msg_type, dlm->key, &leave_msg, |
594 | sizeof(leave_msg), node, NULL); | |
a5196ec5 | 595 | if (status < 0) |
bddefdee SM |
596 | mlog(ML_ERROR, "Error %d sending domain exit message %u " |
597 | "to node %u on domain %s\n", status, msg_type, node, | |
598 | dlm->name); | |
6714d8e8 KH |
599 | |
600 | return status; | |
601 | } | |
602 | ||
bddefdee SM |
603 | static void dlm_begin_exit_domain(struct dlm_ctxt *dlm) |
604 | { | |
605 | int node = -1; | |
606 | ||
607 | /* Support for begin exit domain was added in 1.2 */ | |
608 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
609 | dlm->dlm_locking_proto.pv_minor < 2) | |
610 | return; | |
611 | ||
612 | /* | |
613 | * Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely | |
614 | * informational. Meaning if a node does not receive the message, | |
615 | * so be it. | |
616 | */ | |
617 | spin_lock(&dlm->spinlock); | |
618 | while (1) { | |
619 | node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, node + 1); | |
620 | if (node >= O2NM_MAX_NODES) | |
621 | break; | |
622 | if (node == dlm->node_num) | |
623 | continue; | |
624 | ||
625 | spin_unlock(&dlm->spinlock); | |
626 | dlm_send_one_domain_exit(dlm, DLM_BEGIN_EXIT_DOMAIN_MSG, node); | |
627 | spin_lock(&dlm->spinlock); | |
628 | } | |
629 | spin_unlock(&dlm->spinlock); | |
630 | } | |
6714d8e8 KH |
631 | |
632 | static void dlm_leave_domain(struct dlm_ctxt *dlm) | |
633 | { | |
634 | int node, clear_node, status; | |
635 | ||
636 | /* At this point we've migrated away all our locks and won't | |
637 | * accept mastership of new ones. The dlm is responsible for | |
638 | * almost nothing now. We make sure not to confuse any joining | |
639 | * nodes and then commence shutdown procedure. */ | |
640 | ||
641 | spin_lock(&dlm->spinlock); | |
642 | /* Clear ourselves from the domain map */ | |
643 | clear_bit(dlm->node_num, dlm->domain_map); | |
644 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, | |
645 | 0)) < O2NM_MAX_NODES) { | |
646 | /* Drop the dlm spinlock. This is safe wrt the domain_map. | |
647 | * -nodes cannot be added now as the | |
648 | * query_join_handlers knows to respond with OK_NO_MAP | |
649 | * -we catch the right network errors if a node is | |
650 | * removed from the map while we're sending him the | |
651 | * exit message. */ | |
652 | spin_unlock(&dlm->spinlock); | |
653 | ||
654 | clear_node = 1; | |
655 | ||
bddefdee SM |
656 | status = dlm_send_one_domain_exit(dlm, DLM_EXIT_DOMAIN_MSG, |
657 | node); | |
6714d8e8 KH |
658 | if (status < 0 && |
659 | status != -ENOPROTOOPT && | |
660 | status != -ENOTCONN) { | |
661 | mlog(ML_NOTICE, "Error %d sending domain exit message " | |
662 | "to node %d\n", status, node); | |
663 | ||
664 | /* Not sure what to do here but lets sleep for | |
665 | * a bit in case this was a transient | |
666 | * error... */ | |
667 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
668 | clear_node = 0; | |
669 | } | |
670 | ||
671 | spin_lock(&dlm->spinlock); | |
672 | /* If we're not clearing the node bit then we intend | |
673 | * to loop back around to try again. */ | |
674 | if (clear_node) | |
675 | clear_bit(node, dlm->domain_map); | |
676 | } | |
677 | spin_unlock(&dlm->spinlock); | |
678 | } | |
679 | ||
6714d8e8 KH |
680 | int dlm_shutting_down(struct dlm_ctxt *dlm) |
681 | { | |
682 | int ret = 0; | |
683 | ||
684 | spin_lock(&dlm_domain_lock); | |
685 | ||
686 | if (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN) | |
687 | ret = 1; | |
688 | ||
689 | spin_unlock(&dlm_domain_lock); | |
690 | ||
691 | return ret; | |
692 | } | |
693 | ||
694 | void dlm_unregister_domain(struct dlm_ctxt *dlm) | |
695 | { | |
696 | int leave = 0; | |
29576f8b | 697 | struct dlm_lock_resource *res; |
6714d8e8 KH |
698 | |
699 | spin_lock(&dlm_domain_lock); | |
700 | BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED); | |
701 | BUG_ON(!dlm->num_joins); | |
702 | ||
703 | dlm->num_joins--; | |
704 | if (!dlm->num_joins) { | |
705 | /* We mark it "in shutdown" now so new register | |
706 | * requests wait until we've completely left the | |
707 | * domain. Don't use DLM_CTXT_LEAVING yet as we still | |
708 | * want new domain joins to communicate with us at | |
709 | * least until we've completed migration of our | |
710 | * resources. */ | |
711 | dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN; | |
712 | leave = 1; | |
713 | } | |
714 | spin_unlock(&dlm_domain_lock); | |
715 | ||
716 | if (leave) { | |
717 | mlog(0, "shutting down domain %s\n", dlm->name); | |
bddefdee | 718 | dlm_begin_exit_domain(dlm); |
6714d8e8 KH |
719 | |
720 | /* We changed dlm state, notify the thread */ | |
721 | dlm_kick_thread(dlm, NULL); | |
722 | ||
ba2bf218 | 723 | while (dlm_migrate_all_locks(dlm)) { |
2f5bf1f2 SM |
724 | /* Give dlm_thread time to purge the lockres' */ |
725 | msleep(500); | |
ba2bf218 KH |
726 | mlog(0, "%s: more migration to do\n", dlm->name); |
727 | } | |
29576f8b SM |
728 | |
729 | /* This list should be empty. If not, print remaining lockres */ | |
730 | if (!list_empty(&dlm->tracking_list)) { | |
731 | mlog(ML_ERROR, "Following lockres' are still on the " | |
732 | "tracking list:\n"); | |
733 | list_for_each_entry(res, &dlm->tracking_list, tracking) | |
734 | dlm_print_one_lock_resource(res); | |
735 | } | |
736 | ||
6714d8e8 KH |
737 | dlm_mark_domain_leaving(dlm); |
738 | dlm_leave_domain(dlm); | |
8decab3c | 739 | printk(KERN_NOTICE "o2dlm: Leaving domain %s\n", dlm->name); |
5dad6c39 | 740 | dlm_force_free_mles(dlm); |
6714d8e8 KH |
741 | dlm_complete_dlm_shutdown(dlm); |
742 | } | |
743 | dlm_put(dlm); | |
744 | } | |
745 | EXPORT_SYMBOL_GPL(dlm_unregister_domain); | |
746 | ||
d24fbcda JB |
747 | static int dlm_query_join_proto_check(char *proto_type, int node, |
748 | struct dlm_protocol_version *ours, | |
749 | struct dlm_protocol_version *request) | |
750 | { | |
751 | int rc; | |
752 | struct dlm_protocol_version proto = *request; | |
753 | ||
754 | if (!dlm_protocol_compare(ours, &proto)) { | |
755 | mlog(0, | |
756 | "node %u wanted to join with %s locking protocol " | |
757 | "%u.%u, we respond with %u.%u\n", | |
758 | node, proto_type, | |
759 | request->pv_major, | |
760 | request->pv_minor, | |
761 | proto.pv_major, proto.pv_minor); | |
762 | request->pv_minor = proto.pv_minor; | |
763 | rc = 0; | |
764 | } else { | |
765 | mlog(ML_NOTICE, | |
766 | "Node %u wanted to join with %s locking " | |
767 | "protocol %u.%u, but we have %u.%u, disallowing\n", | |
768 | node, proto_type, | |
769 | request->pv_major, | |
770 | request->pv_minor, | |
771 | ours->pv_major, | |
772 | ours->pv_minor); | |
773 | rc = 1; | |
774 | } | |
775 | ||
776 | return rc; | |
777 | } | |
778 | ||
0f71b7b4 JB |
779 | /* |
780 | * struct dlm_query_join_packet is made up of four one-byte fields. They | |
781 | * are effectively in big-endian order already. However, little-endian | |
782 | * machines swap them before putting the packet on the wire (because | |
783 | * query_join's response is a status, and that status is treated as a u32 | |
784 | * on the wire). Thus, a big-endian and little-endian machines will treat | |
785 | * this structure differently. | |
786 | * | |
787 | * The solution is to have little-endian machines swap the structure when | |
788 | * converting from the structure to the u32 representation. This will | |
789 | * result in the structure having the correct format on the wire no matter | |
790 | * the host endian format. | |
791 | */ | |
792 | static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet, | |
793 | u32 *wire) | |
794 | { | |
795 | union dlm_query_join_response response; | |
796 | ||
797 | response.packet = *packet; | |
85158410 | 798 | *wire = be32_to_cpu(response.intval); |
0f71b7b4 JB |
799 | } |
800 | ||
801 | static void dlm_query_join_wire_to_packet(u32 wire, | |
802 | struct dlm_query_join_packet *packet) | |
803 | { | |
804 | union dlm_query_join_response response; | |
805 | ||
806 | response.intval = cpu_to_be32(wire); | |
807 | *packet = response.packet; | |
808 | } | |
809 | ||
d74c9803 KH |
810 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
811 | void **ret_data) | |
6714d8e8 KH |
812 | { |
813 | struct dlm_query_join_request *query; | |
0f71b7b4 JB |
814 | struct dlm_query_join_packet packet = { |
815 | .code = JOIN_DISALLOW, | |
d24fbcda | 816 | }; |
6714d8e8 | 817 | struct dlm_ctxt *dlm = NULL; |
0f71b7b4 | 818 | u32 response; |
1faf2894 | 819 | u8 nodenum; |
6714d8e8 KH |
820 | |
821 | query = (struct dlm_query_join_request *) msg->buf; | |
822 | ||
823 | mlog(0, "node %u wants to join domain %s\n", query->node_idx, | |
824 | query->domain); | |
825 | ||
826 | /* | |
827 | * If heartbeat doesn't consider the node live, tell it | |
828 | * to back off and try again. This gives heartbeat a chance | |
829 | * to catch up. | |
830 | */ | |
70e82a12 | 831 | if (!o2hb_check_node_heartbeating_no_sem(query->node_idx)) { |
6714d8e8 KH |
832 | mlog(0, "node %u is not in our live map yet\n", |
833 | query->node_idx); | |
834 | ||
0f71b7b4 | 835 | packet.code = JOIN_DISALLOW; |
6714d8e8 KH |
836 | goto respond; |
837 | } | |
838 | ||
0f71b7b4 | 839 | packet.code = JOIN_OK_NO_MAP; |
6714d8e8 KH |
840 | |
841 | spin_lock(&dlm_domain_lock); | |
842 | dlm = __dlm_lookup_domain_full(query->domain, query->name_len); | |
1faf2894 SE |
843 | if (!dlm) |
844 | goto unlock_respond; | |
845 | ||
846 | /* | |
847 | * There is a small window where the joining node may not see the | |
848 | * node(s) that just left but still part of the cluster. DISALLOW | |
849 | * join request if joining node has different node map. | |
850 | */ | |
851 | nodenum=0; | |
852 | while (nodenum < O2NM_MAX_NODES) { | |
853 | if (test_bit(nodenum, dlm->domain_map)) { | |
854 | if (!byte_test_bit(nodenum, query->node_map)) { | |
e4968476 SM |
855 | mlog(0, "disallow join as node %u does not " |
856 | "have node %u in its nodemap\n", | |
857 | query->node_idx, nodenum); | |
0f71b7b4 | 858 | packet.code = JOIN_DISALLOW; |
1faf2894 SE |
859 | goto unlock_respond; |
860 | } | |
861 | } | |
862 | nodenum++; | |
863 | } | |
864 | ||
6714d8e8 | 865 | /* Once the dlm ctxt is marked as leaving then we don't want |
2bd63216 | 866 | * to be put in someone's domain map. |
e2faea4c KH |
867 | * Also, explicitly disallow joining at certain troublesome |
868 | * times (ie. during recovery). */ | |
b3e3e5af | 869 | if (dlm->dlm_state != DLM_CTXT_LEAVING) { |
e2faea4c | 870 | int bit = query->node_idx; |
6714d8e8 KH |
871 | spin_lock(&dlm->spinlock); |
872 | ||
873 | if (dlm->dlm_state == DLM_CTXT_NEW && | |
874 | dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) { | |
875 | /*If this is a brand new context and we | |
876 | * haven't started our join process yet, then | |
877 | * the other node won the race. */ | |
0f71b7b4 | 878 | packet.code = JOIN_OK_NO_MAP; |
6714d8e8 KH |
879 | } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { |
880 | /* Disallow parallel joins. */ | |
0f71b7b4 | 881 | packet.code = JOIN_DISALLOW; |
e2faea4c | 882 | } else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) { |
e4968476 | 883 | mlog(0, "node %u trying to join, but recovery " |
e2faea4c | 884 | "is ongoing.\n", bit); |
0f71b7b4 | 885 | packet.code = JOIN_DISALLOW; |
e2faea4c | 886 | } else if (test_bit(bit, dlm->recovery_map)) { |
e4968476 | 887 | mlog(0, "node %u trying to join, but it " |
e2faea4c | 888 | "still needs recovery.\n", bit); |
0f71b7b4 | 889 | packet.code = JOIN_DISALLOW; |
e2faea4c | 890 | } else if (test_bit(bit, dlm->domain_map)) { |
e4968476 | 891 | mlog(0, "node %u trying to join, but it " |
e2faea4c KH |
892 | "is still in the domain! needs recovery?\n", |
893 | bit); | |
0f71b7b4 | 894 | packet.code = JOIN_DISALLOW; |
6714d8e8 KH |
895 | } else { |
896 | /* Alright we're fully a part of this domain | |
897 | * so we keep some state as to who's joining | |
898 | * and indicate to him that needs to be fixed | |
899 | * up. */ | |
d24fbcda JB |
900 | |
901 | /* Make sure we speak compatible locking protocols. */ | |
902 | if (dlm_query_join_proto_check("DLM", bit, | |
903 | &dlm->dlm_locking_proto, | |
904 | &query->dlm_proto)) { | |
0f71b7b4 | 905 | packet.code = JOIN_PROTOCOL_MISMATCH; |
d24fbcda JB |
906 | } else if (dlm_query_join_proto_check("fs", bit, |
907 | &dlm->fs_locking_proto, | |
908 | &query->fs_proto)) { | |
0f71b7b4 | 909 | packet.code = JOIN_PROTOCOL_MISMATCH; |
d24fbcda | 910 | } else { |
0f71b7b4 JB |
911 | packet.dlm_minor = query->dlm_proto.pv_minor; |
912 | packet.fs_minor = query->fs_proto.pv_minor; | |
913 | packet.code = JOIN_OK; | |
d24fbcda JB |
914 | __dlm_set_joining_node(dlm, query->node_idx); |
915 | } | |
6714d8e8 KH |
916 | } |
917 | ||
918 | spin_unlock(&dlm->spinlock); | |
919 | } | |
1faf2894 | 920 | unlock_respond: |
6714d8e8 KH |
921 | spin_unlock(&dlm_domain_lock); |
922 | ||
923 | respond: | |
0f71b7b4 | 924 | mlog(0, "We respond with %u\n", packet.code); |
6714d8e8 | 925 | |
0f71b7b4 JB |
926 | dlm_query_join_packet_to_wire(&packet, &response); |
927 | return response; | |
6714d8e8 KH |
928 | } |
929 | ||
d74c9803 KH |
930 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, |
931 | void **ret_data) | |
6714d8e8 KH |
932 | { |
933 | struct dlm_assert_joined *assert; | |
934 | struct dlm_ctxt *dlm = NULL; | |
935 | ||
936 | assert = (struct dlm_assert_joined *) msg->buf; | |
937 | ||
938 | mlog(0, "node %u asserts join on domain %s\n", assert->node_idx, | |
939 | assert->domain); | |
940 | ||
941 | spin_lock(&dlm_domain_lock); | |
942 | dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len); | |
943 | /* XXX should we consider no dlm ctxt an error? */ | |
944 | if (dlm) { | |
945 | spin_lock(&dlm->spinlock); | |
946 | ||
947 | /* Alright, this node has officially joined our | |
948 | * domain. Set him in the map and clean up our | |
949 | * leftover join state. */ | |
950 | BUG_ON(dlm->joining_node != assert->node_idx); | |
01c6222f X |
951 | |
952 | if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) { | |
953 | mlog(0, "dlm recovery is ongoing, disallow join\n"); | |
954 | spin_unlock(&dlm->spinlock); | |
955 | spin_unlock(&dlm_domain_lock); | |
956 | return -EAGAIN; | |
957 | } | |
958 | ||
6714d8e8 | 959 | set_bit(assert->node_idx, dlm->domain_map); |
bddefdee | 960 | clear_bit(assert->node_idx, dlm->exit_domain_map); |
6714d8e8 KH |
961 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); |
962 | ||
8decab3c | 963 | printk(KERN_NOTICE "o2dlm: Node %u joins domain %s ", |
781ee3e2 | 964 | assert->node_idx, dlm->name); |
6714d8e8 KH |
965 | __dlm_print_nodes(dlm); |
966 | ||
967 | /* notify anything attached to the heartbeat events */ | |
968 | dlm_hb_event_notify_attached(dlm, assert->node_idx, 1); | |
969 | ||
970 | spin_unlock(&dlm->spinlock); | |
971 | } | |
972 | spin_unlock(&dlm_domain_lock); | |
973 | ||
974 | return 0; | |
975 | } | |
976 | ||
ea203441 | 977 | static int dlm_match_regions(struct dlm_ctxt *dlm, |
770c4d81 SM |
978 | struct dlm_query_region *qr, |
979 | char *local, int locallen) | |
ea203441 | 980 | { |
770c4d81 | 981 | char *remote = qr->qr_regions; |
ea203441 SM |
982 | char *l, *r; |
983 | int localnr, i, j, foundit; | |
984 | int status = 0; | |
985 | ||
986 | if (!o2hb_global_heartbeat_active()) { | |
987 | if (qr->qr_numregions) { | |
988 | mlog(ML_ERROR, "Domain %s: Joining node %d has global " | |
989 | "heartbeat enabled but local node %d does not\n", | |
990 | qr->qr_domain, qr->qr_node, dlm->node_num); | |
991 | status = -EINVAL; | |
992 | } | |
993 | goto bail; | |
994 | } | |
995 | ||
996 | if (o2hb_global_heartbeat_active() && !qr->qr_numregions) { | |
997 | mlog(ML_ERROR, "Domain %s: Local node %d has global " | |
998 | "heartbeat enabled but joining node %d does not\n", | |
999 | qr->qr_domain, dlm->node_num, qr->qr_node); | |
1000 | status = -EINVAL; | |
1001 | goto bail; | |
1002 | } | |
1003 | ||
1004 | r = remote; | |
1005 | for (i = 0; i < qr->qr_numregions; ++i) { | |
1006 | mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r); | |
1007 | r += O2HB_MAX_REGION_NAME_LEN; | |
1008 | } | |
1009 | ||
770c4d81 SM |
1010 | localnr = min(O2NM_MAX_REGIONS, locallen/O2HB_MAX_REGION_NAME_LEN); |
1011 | localnr = o2hb_get_all_regions(local, (u8)localnr); | |
ea203441 SM |
1012 | |
1013 | /* compare local regions with remote */ | |
1014 | l = local; | |
1015 | for (i = 0; i < localnr; ++i) { | |
1016 | foundit = 0; | |
1017 | r = remote; | |
1018 | for (j = 0; j <= qr->qr_numregions; ++j) { | |
1019 | if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) { | |
1020 | foundit = 1; | |
1021 | break; | |
1022 | } | |
1023 | r += O2HB_MAX_REGION_NAME_LEN; | |
1024 | } | |
1025 | if (!foundit) { | |
1026 | status = -EINVAL; | |
1027 | mlog(ML_ERROR, "Domain %s: Region '%.*s' registered " | |
1028 | "in local node %d but not in joining node %d\n", | |
1029 | qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l, | |
1030 | dlm->node_num, qr->qr_node); | |
1031 | goto bail; | |
1032 | } | |
1033 | l += O2HB_MAX_REGION_NAME_LEN; | |
1034 | } | |
1035 | ||
1036 | /* compare remote with local regions */ | |
1037 | r = remote; | |
1038 | for (i = 0; i < qr->qr_numregions; ++i) { | |
1039 | foundit = 0; | |
1040 | l = local; | |
1041 | for (j = 0; j < localnr; ++j) { | |
1042 | if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) { | |
1043 | foundit = 1; | |
1044 | break; | |
1045 | } | |
1046 | l += O2HB_MAX_REGION_NAME_LEN; | |
1047 | } | |
1048 | if (!foundit) { | |
1049 | status = -EINVAL; | |
1050 | mlog(ML_ERROR, "Domain %s: Region '%.*s' registered " | |
1051 | "in joining node %d but not in local node %d\n", | |
1052 | qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r, | |
1053 | qr->qr_node, dlm->node_num); | |
1054 | goto bail; | |
1055 | } | |
1056 | r += O2HB_MAX_REGION_NAME_LEN; | |
1057 | } | |
1058 | ||
1059 | bail: | |
ea203441 SM |
1060 | return status; |
1061 | } | |
1062 | ||
1063 | static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map) | |
1064 | { | |
1065 | struct dlm_query_region *qr = NULL; | |
1066 | int status, ret = 0, i; | |
1067 | char *p; | |
1068 | ||
1069 | if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES) | |
1070 | goto bail; | |
1071 | ||
1072 | qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL); | |
1073 | if (!qr) { | |
1074 | ret = -ENOMEM; | |
1075 | mlog_errno(ret); | |
1076 | goto bail; | |
1077 | } | |
1078 | ||
1079 | qr->qr_node = dlm->node_num; | |
1080 | qr->qr_namelen = strlen(dlm->name); | |
1081 | memcpy(qr->qr_domain, dlm->name, qr->qr_namelen); | |
1082 | /* if local hb, the numregions will be zero */ | |
1083 | if (o2hb_global_heartbeat_active()) | |
1084 | qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions, | |
1085 | O2NM_MAX_REGIONS); | |
1086 | ||
1087 | p = qr->qr_regions; | |
1088 | for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN) | |
1089 | mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p); | |
1090 | ||
1091 | i = -1; | |
1092 | while ((i = find_next_bit(node_map, O2NM_MAX_NODES, | |
1093 | i + 1)) < O2NM_MAX_NODES) { | |
1094 | if (i == dlm->node_num) | |
1095 | continue; | |
1096 | ||
1097 | mlog(0, "Sending regions to node %d\n", i); | |
1098 | ||
1099 | ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr, | |
1100 | sizeof(struct dlm_query_region), | |
1101 | i, &status); | |
1102 | if (ret >= 0) | |
1103 | ret = status; | |
1104 | if (ret) { | |
1105 | mlog(ML_ERROR, "Region mismatch %d, node %d\n", | |
1106 | ret, i); | |
1107 | break; | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | bail: | |
1112 | kfree(qr); | |
1113 | return ret; | |
1114 | } | |
1115 | ||
1116 | static int dlm_query_region_handler(struct o2net_msg *msg, u32 len, | |
1117 | void *data, void **ret_data) | |
1118 | { | |
1119 | struct dlm_query_region *qr; | |
1120 | struct dlm_ctxt *dlm = NULL; | |
770c4d81 | 1121 | char *local = NULL; |
ea203441 | 1122 | int status = 0; |
ea203441 SM |
1123 | |
1124 | qr = (struct dlm_query_region *) msg->buf; | |
1125 | ||
1126 | mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node, | |
1127 | qr->qr_domain); | |
1128 | ||
770c4d81 SM |
1129 | /* buffer used in dlm_mast_regions() */ |
1130 | local = kmalloc(sizeof(qr->qr_regions), GFP_KERNEL); | |
a35ad97c ZG |
1131 | if (!local) |
1132 | return -ENOMEM; | |
770c4d81 | 1133 | |
ea203441 SM |
1134 | status = -EINVAL; |
1135 | ||
1136 | spin_lock(&dlm_domain_lock); | |
1137 | dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen); | |
1138 | if (!dlm) { | |
1139 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " | |
1140 | "before join domain\n", qr->qr_node, qr->qr_domain); | |
a35ad97c | 1141 | goto out_domain_lock; |
ea203441 SM |
1142 | } |
1143 | ||
1144 | spin_lock(&dlm->spinlock); | |
ea203441 SM |
1145 | if (dlm->joining_node != qr->qr_node) { |
1146 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " | |
1147 | "but joining node is %d\n", qr->qr_node, qr->qr_domain, | |
1148 | dlm->joining_node); | |
a35ad97c | 1149 | goto out_dlm_lock; |
ea203441 SM |
1150 | } |
1151 | ||
1152 | /* Support for global heartbeat was added in 1.1 */ | |
1153 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
1154 | dlm->dlm_locking_proto.pv_minor == 0) { | |
1155 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " | |
1156 | "but active dlm protocol is %d.%d\n", qr->qr_node, | |
1157 | qr->qr_domain, dlm->dlm_locking_proto.pv_major, | |
1158 | dlm->dlm_locking_proto.pv_minor); | |
a35ad97c | 1159 | goto out_dlm_lock; |
ea203441 SM |
1160 | } |
1161 | ||
770c4d81 | 1162 | status = dlm_match_regions(dlm, qr, local, sizeof(qr->qr_regions)); |
ea203441 | 1163 | |
a35ad97c ZG |
1164 | out_dlm_lock: |
1165 | spin_unlock(&dlm->spinlock); | |
1166 | ||
1167 | out_domain_lock: | |
ea203441 SM |
1168 | spin_unlock(&dlm_domain_lock); |
1169 | ||
770c4d81 SM |
1170 | kfree(local); |
1171 | ||
ea203441 SM |
1172 | return status; |
1173 | } | |
1174 | ||
18cfdf1b SM |
1175 | static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn) |
1176 | { | |
1177 | struct o2nm_node *local; | |
1178 | struct dlm_node_info *remote; | |
1179 | int i, j; | |
1180 | int status = 0; | |
1181 | ||
1182 | for (j = 0; j < qn->qn_numnodes; ++j) | |
1183 | mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum, | |
1184 | &(qn->qn_nodes[j].ni_ipv4_address), | |
1185 | ntohs(qn->qn_nodes[j].ni_ipv4_port)); | |
1186 | ||
1187 | for (i = 0; i < O2NM_MAX_NODES && !status; ++i) { | |
1188 | local = o2nm_get_node_by_num(i); | |
1189 | remote = NULL; | |
1190 | for (j = 0; j < qn->qn_numnodes; ++j) { | |
1191 | if (qn->qn_nodes[j].ni_nodenum == i) { | |
1192 | remote = &(qn->qn_nodes[j]); | |
1193 | break; | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | if (!local && !remote) | |
1198 | continue; | |
1199 | ||
1200 | if ((local && !remote) || (!local && remote)) | |
1201 | status = -EINVAL; | |
1202 | ||
1203 | if (!status && | |
1204 | ((remote->ni_nodenum != local->nd_num) || | |
1205 | (remote->ni_ipv4_port != local->nd_ipv4_port) || | |
1206 | (remote->ni_ipv4_address != local->nd_ipv4_address))) | |
1207 | status = -EINVAL; | |
1208 | ||
1209 | if (status) { | |
1210 | if (remote && !local) | |
1211 | mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) " | |
1212 | "registered in joining node %d but not in " | |
1213 | "local node %d\n", qn->qn_domain, | |
1214 | remote->ni_nodenum, | |
1215 | &(remote->ni_ipv4_address), | |
1216 | ntohs(remote->ni_ipv4_port), | |
1217 | qn->qn_nodenum, dlm->node_num); | |
1218 | if (local && !remote) | |
1219 | mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) " | |
1220 | "registered in local node %d but not in " | |
1221 | "joining node %d\n", qn->qn_domain, | |
1222 | local->nd_num, &(local->nd_ipv4_address), | |
1223 | ntohs(local->nd_ipv4_port), | |
1224 | dlm->node_num, qn->qn_nodenum); | |
1225 | BUG_ON((!local && !remote)); | |
1226 | } | |
1227 | ||
1228 | if (local) | |
1229 | o2nm_node_put(local); | |
1230 | } | |
1231 | ||
1232 | return status; | |
1233 | } | |
1234 | ||
1235 | static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map) | |
1236 | { | |
1237 | struct dlm_query_nodeinfo *qn = NULL; | |
1238 | struct o2nm_node *node; | |
1239 | int ret = 0, status, count, i; | |
1240 | ||
1241 | if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES) | |
1242 | goto bail; | |
1243 | ||
1244 | qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL); | |
1245 | if (!qn) { | |
1246 | ret = -ENOMEM; | |
1247 | mlog_errno(ret); | |
1248 | goto bail; | |
1249 | } | |
1250 | ||
1251 | for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) { | |
1252 | node = o2nm_get_node_by_num(i); | |
1253 | if (!node) | |
1254 | continue; | |
1255 | qn->qn_nodes[count].ni_nodenum = node->nd_num; | |
1256 | qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port; | |
1257 | qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address; | |
1258 | mlog(0, "Node %3d, %pI4:%u\n", node->nd_num, | |
1259 | &(node->nd_ipv4_address), ntohs(node->nd_ipv4_port)); | |
1260 | ++count; | |
1261 | o2nm_node_put(node); | |
1262 | } | |
1263 | ||
1264 | qn->qn_nodenum = dlm->node_num; | |
1265 | qn->qn_numnodes = count; | |
1266 | qn->qn_namelen = strlen(dlm->name); | |
1267 | memcpy(qn->qn_domain, dlm->name, qn->qn_namelen); | |
1268 | ||
1269 | i = -1; | |
1270 | while ((i = find_next_bit(node_map, O2NM_MAX_NODES, | |
1271 | i + 1)) < O2NM_MAX_NODES) { | |
1272 | if (i == dlm->node_num) | |
1273 | continue; | |
1274 | ||
1275 | mlog(0, "Sending nodeinfo to node %d\n", i); | |
1276 | ||
1277 | ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY, | |
1278 | qn, sizeof(struct dlm_query_nodeinfo), | |
1279 | i, &status); | |
1280 | if (ret >= 0) | |
1281 | ret = status; | |
1282 | if (ret) { | |
1283 | mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i); | |
1284 | break; | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | bail: | |
1289 | kfree(qn); | |
1290 | return ret; | |
1291 | } | |
1292 | ||
1293 | static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len, | |
1294 | void *data, void **ret_data) | |
1295 | { | |
1296 | struct dlm_query_nodeinfo *qn; | |
1297 | struct dlm_ctxt *dlm = NULL; | |
1298 | int locked = 0, status = -EINVAL; | |
1299 | ||
1300 | qn = (struct dlm_query_nodeinfo *) msg->buf; | |
1301 | ||
1302 | mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum, | |
1303 | qn->qn_domain); | |
1304 | ||
1305 | spin_lock(&dlm_domain_lock); | |
1306 | dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen); | |
1307 | if (!dlm) { | |
1308 | mlog(ML_ERROR, "Node %d queried nodes on domain %s before " | |
1309 | "join domain\n", qn->qn_nodenum, qn->qn_domain); | |
1310 | goto bail; | |
1311 | } | |
1312 | ||
1313 | spin_lock(&dlm->spinlock); | |
1314 | locked = 1; | |
1315 | if (dlm->joining_node != qn->qn_nodenum) { | |
1316 | mlog(ML_ERROR, "Node %d queried nodes on domain %s but " | |
1317 | "joining node is %d\n", qn->qn_nodenum, qn->qn_domain, | |
1318 | dlm->joining_node); | |
1319 | goto bail; | |
1320 | } | |
1321 | ||
1322 | /* Support for node query was added in 1.1 */ | |
1323 | if (dlm->dlm_locking_proto.pv_major == 1 && | |
1324 | dlm->dlm_locking_proto.pv_minor == 0) { | |
1325 | mlog(ML_ERROR, "Node %d queried nodes on domain %s " | |
1326 | "but active dlm protocol is %d.%d\n", qn->qn_nodenum, | |
1327 | qn->qn_domain, dlm->dlm_locking_proto.pv_major, | |
1328 | dlm->dlm_locking_proto.pv_minor); | |
1329 | goto bail; | |
1330 | } | |
1331 | ||
1332 | status = dlm_match_nodes(dlm, qn); | |
1333 | ||
1334 | bail: | |
1335 | if (locked) | |
1336 | spin_unlock(&dlm->spinlock); | |
1337 | spin_unlock(&dlm_domain_lock); | |
1338 | ||
1339 | return status; | |
1340 | } | |
1341 | ||
d74c9803 KH |
1342 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, |
1343 | void **ret_data) | |
6714d8e8 KH |
1344 | { |
1345 | struct dlm_cancel_join *cancel; | |
1346 | struct dlm_ctxt *dlm = NULL; | |
1347 | ||
1348 | cancel = (struct dlm_cancel_join *) msg->buf; | |
1349 | ||
1350 | mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx, | |
1351 | cancel->domain); | |
1352 | ||
1353 | spin_lock(&dlm_domain_lock); | |
1354 | dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len); | |
1355 | ||
1356 | if (dlm) { | |
1357 | spin_lock(&dlm->spinlock); | |
1358 | ||
1359 | /* Yikes, this guy wants to cancel his join. No | |
1360 | * problem, we simply cleanup our join state. */ | |
1361 | BUG_ON(dlm->joining_node != cancel->node_idx); | |
1362 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
1363 | ||
1364 | spin_unlock(&dlm->spinlock); | |
1365 | } | |
1366 | spin_unlock(&dlm_domain_lock); | |
1367 | ||
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm, | |
1372 | unsigned int node) | |
1373 | { | |
1374 | int status; | |
1375 | struct dlm_cancel_join cancel_msg; | |
1376 | ||
1377 | memset(&cancel_msg, 0, sizeof(cancel_msg)); | |
1378 | cancel_msg.node_idx = dlm->node_num; | |
1379 | cancel_msg.name_len = strlen(dlm->name); | |
1380 | memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len); | |
1381 | ||
1382 | status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
1383 | &cancel_msg, sizeof(cancel_msg), node, | |
1384 | NULL); | |
1385 | if (status < 0) { | |
a5196ec5 WW |
1386 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1387 | "node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
1388 | node); | |
6714d8e8 KH |
1389 | goto bail; |
1390 | } | |
1391 | ||
1392 | bail: | |
1393 | return status; | |
1394 | } | |
1395 | ||
1396 | /* map_size should be in bytes. */ | |
1397 | static int dlm_send_join_cancels(struct dlm_ctxt *dlm, | |
1398 | unsigned long *node_map, | |
1399 | unsigned int map_size) | |
1400 | { | |
1401 | int status, tmpstat; | |
8d67d3c2 | 1402 | int node; |
6714d8e8 KH |
1403 | |
1404 | if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) * | |
1405 | sizeof(unsigned long))) { | |
1406 | mlog(ML_ERROR, | |
1407 | "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n", | |
3a4780a8 | 1408 | map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES)); |
6714d8e8 KH |
1409 | return -EINVAL; |
1410 | } | |
1411 | ||
1412 | status = 0; | |
1413 | node = -1; | |
1414 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, | |
1415 | node + 1)) < O2NM_MAX_NODES) { | |
1416 | if (node == dlm->node_num) | |
1417 | continue; | |
1418 | ||
1419 | tmpstat = dlm_send_one_join_cancel(dlm, node); | |
1420 | if (tmpstat) { | |
1421 | mlog(ML_ERROR, "Error return %d cancelling join on " | |
1422 | "node %d\n", tmpstat, node); | |
1423 | if (!status) | |
1424 | status = tmpstat; | |
1425 | } | |
1426 | } | |
1427 | ||
1428 | if (status) | |
1429 | mlog_errno(status); | |
1430 | return status; | |
1431 | } | |
1432 | ||
1433 | static int dlm_request_join(struct dlm_ctxt *dlm, | |
1434 | int node, | |
d24fbcda | 1435 | enum dlm_query_join_response_code *response) |
6714d8e8 | 1436 | { |
d24fbcda | 1437 | int status; |
6714d8e8 | 1438 | struct dlm_query_join_request join_msg; |
0f71b7b4 JB |
1439 | struct dlm_query_join_packet packet; |
1440 | u32 join_resp; | |
6714d8e8 KH |
1441 | |
1442 | mlog(0, "querying node %d\n", node); | |
1443 | ||
1444 | memset(&join_msg, 0, sizeof(join_msg)); | |
1445 | join_msg.node_idx = dlm->node_num; | |
1446 | join_msg.name_len = strlen(dlm->name); | |
1447 | memcpy(join_msg.domain, dlm->name, join_msg.name_len); | |
d24fbcda JB |
1448 | join_msg.dlm_proto = dlm->dlm_locking_proto; |
1449 | join_msg.fs_proto = dlm->fs_locking_proto; | |
6714d8e8 | 1450 | |
1faf2894 SE |
1451 | /* copy live node map to join message */ |
1452 | byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES); | |
1453 | ||
6714d8e8 | 1454 | status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg, |
a5196ec5 | 1455 | sizeof(join_msg), node, &join_resp); |
6714d8e8 | 1456 | if (status < 0 && status != -ENOPROTOOPT) { |
a5196ec5 WW |
1457 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1458 | "node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, | |
1459 | node); | |
6714d8e8 KH |
1460 | goto bail; |
1461 | } | |
0f71b7b4 | 1462 | dlm_query_join_wire_to_packet(join_resp, &packet); |
6714d8e8 KH |
1463 | |
1464 | /* -ENOPROTOOPT from the net code means the other side isn't | |
1465 | listening for our message type -- that's fine, it means | |
1466 | his dlm isn't up, so we can consider him a 'yes' but not | |
1467 | joined into the domain. */ | |
1468 | if (status == -ENOPROTOOPT) { | |
1469 | status = 0; | |
1470 | *response = JOIN_OK_NO_MAP; | |
6714d8e8 | 1471 | } else { |
72f6fe1f NZ |
1472 | *response = packet.code; |
1473 | switch (packet.code) { | |
1474 | case JOIN_DISALLOW: | |
1475 | case JOIN_OK_NO_MAP: | |
1476 | break; | |
1477 | case JOIN_PROTOCOL_MISMATCH: | |
1478 | mlog(ML_NOTICE, | |
1479 | "This node requested DLM locking protocol %u.%u and " | |
1480 | "filesystem locking protocol %u.%u. At least one of " | |
1481 | "the protocol versions on node %d is not compatible, " | |
1482 | "disconnecting\n", | |
1483 | dlm->dlm_locking_proto.pv_major, | |
1484 | dlm->dlm_locking_proto.pv_minor, | |
1485 | dlm->fs_locking_proto.pv_major, | |
1486 | dlm->fs_locking_proto.pv_minor, | |
1487 | node); | |
1488 | status = -EPROTO; | |
1489 | break; | |
1490 | case JOIN_OK: | |
1491 | /* Use the same locking protocol as the remote node */ | |
1492 | dlm->dlm_locking_proto.pv_minor = packet.dlm_minor; | |
1493 | dlm->fs_locking_proto.pv_minor = packet.fs_minor; | |
1494 | mlog(0, | |
1495 | "Node %d responds JOIN_OK with DLM locking protocol " | |
1496 | "%u.%u and fs locking protocol %u.%u\n", | |
1497 | node, | |
1498 | dlm->dlm_locking_proto.pv_major, | |
1499 | dlm->dlm_locking_proto.pv_minor, | |
1500 | dlm->fs_locking_proto.pv_major, | |
1501 | dlm->fs_locking_proto.pv_minor); | |
1502 | break; | |
1503 | default: | |
1504 | status = -EINVAL; | |
1505 | mlog(ML_ERROR, "invalid response %d from node %u\n", | |
1506 | packet.code, node); | |
1507 | /* Reset response to JOIN_DISALLOW */ | |
1508 | *response = JOIN_DISALLOW; | |
1509 | break; | |
1510 | } | |
6714d8e8 KH |
1511 | } |
1512 | ||
1513 | mlog(0, "status %d, node %d response is %d\n", status, node, | |
0f71b7b4 | 1514 | *response); |
6714d8e8 KH |
1515 | |
1516 | bail: | |
1517 | return status; | |
1518 | } | |
1519 | ||
1520 | static int dlm_send_one_join_assert(struct dlm_ctxt *dlm, | |
1521 | unsigned int node) | |
1522 | { | |
1523 | int status; | |
01c6222f | 1524 | int ret; |
6714d8e8 KH |
1525 | struct dlm_assert_joined assert_msg; |
1526 | ||
1527 | mlog(0, "Sending join assert to node %u\n", node); | |
1528 | ||
1529 | memset(&assert_msg, 0, sizeof(assert_msg)); | |
1530 | assert_msg.node_idx = dlm->node_num; | |
1531 | assert_msg.name_len = strlen(dlm->name); | |
1532 | memcpy(assert_msg.domain, dlm->name, assert_msg.name_len); | |
1533 | ||
1534 | status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1535 | &assert_msg, sizeof(assert_msg), node, | |
01c6222f | 1536 | &ret); |
6714d8e8 | 1537 | if (status < 0) |
a5196ec5 WW |
1538 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
1539 | "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1540 | node); | |
01c6222f X |
1541 | else |
1542 | status = ret; | |
6714d8e8 KH |
1543 | |
1544 | return status; | |
1545 | } | |
1546 | ||
1547 | static void dlm_send_join_asserts(struct dlm_ctxt *dlm, | |
1548 | unsigned long *node_map) | |
1549 | { | |
1550 | int status, node, live; | |
1551 | ||
1552 | status = 0; | |
1553 | node = -1; | |
1554 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, | |
1555 | node + 1)) < O2NM_MAX_NODES) { | |
1556 | if (node == dlm->node_num) | |
1557 | continue; | |
1558 | ||
1559 | do { | |
1560 | /* It is very important that this message be | |
1561 | * received so we spin until either the node | |
1562 | * has died or it gets the message. */ | |
1563 | status = dlm_send_one_join_assert(dlm, node); | |
1564 | ||
1565 | spin_lock(&dlm->spinlock); | |
1566 | live = test_bit(node, dlm->live_nodes_map); | |
1567 | spin_unlock(&dlm->spinlock); | |
1568 | ||
1569 | if (status) { | |
1570 | mlog(ML_ERROR, "Error return %d asserting " | |
1571 | "join on node %d\n", status, node); | |
1572 | ||
1573 | /* give us some time between errors... */ | |
1574 | if (live) | |
1575 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
1576 | } | |
1577 | } while (status && live); | |
1578 | } | |
1579 | } | |
1580 | ||
1581 | struct domain_join_ctxt { | |
1582 | unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1583 | unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1584 | }; | |
1585 | ||
1586 | static int dlm_should_restart_join(struct dlm_ctxt *dlm, | |
1587 | struct domain_join_ctxt *ctxt, | |
d24fbcda | 1588 | enum dlm_query_join_response_code response) |
6714d8e8 KH |
1589 | { |
1590 | int ret; | |
1591 | ||
1592 | if (response == JOIN_DISALLOW) { | |
1593 | mlog(0, "Latest response of disallow -- should restart\n"); | |
1594 | return 1; | |
1595 | } | |
1596 | ||
1597 | spin_lock(&dlm->spinlock); | |
1598 | /* For now, we restart the process if the node maps have | |
1599 | * changed at all */ | |
1600 | ret = memcmp(ctxt->live_map, dlm->live_nodes_map, | |
1601 | sizeof(dlm->live_nodes_map)); | |
1602 | spin_unlock(&dlm->spinlock); | |
1603 | ||
1604 | if (ret) | |
1605 | mlog(0, "Node maps changed -- should restart\n"); | |
1606 | ||
1607 | return ret; | |
1608 | } | |
1609 | ||
1610 | static int dlm_try_to_join_domain(struct dlm_ctxt *dlm) | |
1611 | { | |
1612 | int status = 0, tmpstat, node; | |
1613 | struct domain_join_ctxt *ctxt; | |
d24fbcda | 1614 | enum dlm_query_join_response_code response = JOIN_DISALLOW; |
6714d8e8 | 1615 | |
ef6b689b | 1616 | mlog(0, "%p", dlm); |
6714d8e8 | 1617 | |
cd861280 | 1618 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); |
6714d8e8 KH |
1619 | if (!ctxt) { |
1620 | status = -ENOMEM; | |
1621 | mlog_errno(status); | |
1622 | goto bail; | |
1623 | } | |
1624 | ||
1625 | /* group sem locking should work for us here -- we're already | |
1626 | * registered for heartbeat events so filling this should be | |
1627 | * atomic wrt getting those handlers called. */ | |
1628 | o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map)); | |
1629 | ||
1630 | spin_lock(&dlm->spinlock); | |
1631 | memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map)); | |
1632 | ||
1633 | __dlm_set_joining_node(dlm, dlm->node_num); | |
1634 | ||
1635 | spin_unlock(&dlm->spinlock); | |
1636 | ||
1637 | node = -1; | |
1638 | while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES, | |
1639 | node + 1)) < O2NM_MAX_NODES) { | |
1640 | if (node == dlm->node_num) | |
1641 | continue; | |
1642 | ||
1643 | status = dlm_request_join(dlm, node, &response); | |
1644 | if (status < 0) { | |
1645 | mlog_errno(status); | |
1646 | goto bail; | |
1647 | } | |
1648 | ||
1649 | /* Ok, either we got a response or the node doesn't have a | |
1650 | * dlm up. */ | |
1651 | if (response == JOIN_OK) | |
1652 | set_bit(node, ctxt->yes_resp_map); | |
1653 | ||
1654 | if (dlm_should_restart_join(dlm, ctxt, response)) { | |
1655 | status = -EAGAIN; | |
1656 | goto bail; | |
1657 | } | |
1658 | } | |
1659 | ||
1660 | mlog(0, "Yay, done querying nodes!\n"); | |
1661 | ||
1662 | /* Yay, everyone agree's we can join the domain. My domain is | |
1663 | * comprised of all nodes who were put in the | |
1664 | * yes_resp_map. Copy that into our domain map and send a join | |
1665 | * assert message to clean up everyone elses state. */ | |
1666 | spin_lock(&dlm->spinlock); | |
1667 | memcpy(dlm->domain_map, ctxt->yes_resp_map, | |
1668 | sizeof(ctxt->yes_resp_map)); | |
1669 | set_bit(dlm->node_num, dlm->domain_map); | |
1670 | spin_unlock(&dlm->spinlock); | |
1671 | ||
18cfdf1b | 1672 | /* Support for global heartbeat and node info was added in 1.1 */ |
4da6dc29 SM |
1673 | if (dlm->dlm_locking_proto.pv_major > 1 || |
1674 | dlm->dlm_locking_proto.pv_minor > 0) { | |
18cfdf1b SM |
1675 | status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map); |
1676 | if (status) { | |
1677 | mlog_errno(status); | |
1678 | goto bail; | |
1679 | } | |
ea203441 SM |
1680 | status = dlm_send_regions(dlm, ctxt->yes_resp_map); |
1681 | if (status) { | |
1682 | mlog_errno(status); | |
1683 | goto bail; | |
1684 | } | |
1685 | } | |
1686 | ||
6714d8e8 KH |
1687 | dlm_send_join_asserts(dlm, ctxt->yes_resp_map); |
1688 | ||
1689 | /* Joined state *must* be set before the joining node | |
1690 | * information, otherwise the query_join handler may read no | |
1691 | * current joiner but a state of NEW and tell joining nodes | |
1692 | * we're not in the domain. */ | |
1693 | spin_lock(&dlm_domain_lock); | |
1694 | dlm->dlm_state = DLM_CTXT_JOINED; | |
1695 | dlm->num_joins++; | |
1696 | spin_unlock(&dlm_domain_lock); | |
1697 | ||
1698 | bail: | |
1699 | spin_lock(&dlm->spinlock); | |
1700 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
8decab3c SM |
1701 | if (!status) { |
1702 | printk(KERN_NOTICE "o2dlm: Joining domain %s ", dlm->name); | |
6714d8e8 | 1703 | __dlm_print_nodes(dlm); |
8decab3c | 1704 | } |
6714d8e8 KH |
1705 | spin_unlock(&dlm->spinlock); |
1706 | ||
1707 | if (ctxt) { | |
1708 | /* Do we need to send a cancel message to any nodes? */ | |
1709 | if (status < 0) { | |
1710 | tmpstat = dlm_send_join_cancels(dlm, | |
1711 | ctxt->yes_resp_map, | |
1712 | sizeof(ctxt->yes_resp_map)); | |
1713 | if (tmpstat < 0) | |
1714 | mlog_errno(tmpstat); | |
1715 | } | |
1716 | kfree(ctxt); | |
1717 | } | |
1718 | ||
1719 | mlog(0, "returning %d\n", status); | |
1720 | return status; | |
1721 | } | |
1722 | ||
1723 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm) | |
1724 | { | |
58a3158a SM |
1725 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up); |
1726 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down); | |
6714d8e8 KH |
1727 | o2net_unregister_handler_list(&dlm->dlm_domain_handlers); |
1728 | } | |
1729 | ||
1730 | static int dlm_register_domain_handlers(struct dlm_ctxt *dlm) | |
1731 | { | |
1732 | int status; | |
1733 | ||
1734 | mlog(0, "registering handlers.\n"); | |
1735 | ||
1736 | o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB, | |
1737 | dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI); | |
cdd09f49 JQ |
1738 | o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB, |
1739 | dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI); | |
1740 | ||
58a3158a | 1741 | status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down); |
6714d8e8 KH |
1742 | if (status) |
1743 | goto bail; | |
1744 | ||
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); | |
60d663cb | 1859 | if (status) |
1860 | goto bail; | |
bddefdee | 1861 | |
60d663cb | 1862 | status = o2net_register_handler(DLM_DEREF_LOCKRES_DONE, dlm->key, |
1863 | sizeof(struct dlm_deref_lockres_done), | |
1864 | dlm_deref_lockres_done_handler, | |
1865 | dlm, NULL, &dlm->dlm_domain_handlers); | |
6714d8e8 KH |
1866 | bail: |
1867 | if (status) | |
1868 | dlm_unregister_domain_handlers(dlm); | |
1869 | ||
1870 | return status; | |
1871 | } | |
1872 | ||
1873 | static int dlm_join_domain(struct dlm_ctxt *dlm) | |
1874 | { | |
1875 | int status; | |
0dd82141 SM |
1876 | unsigned int backoff; |
1877 | unsigned int total_backoff = 0; | |
5afc44e2 | 1878 | char wq_name[O2NM_MAX_NAME_LEN]; |
6714d8e8 KH |
1879 | |
1880 | BUG_ON(!dlm); | |
1881 | ||
1882 | mlog(0, "Join domain %s\n", dlm->name); | |
1883 | ||
1884 | status = dlm_register_domain_handlers(dlm); | |
1885 | if (status) { | |
1886 | mlog_errno(status); | |
1887 | goto bail; | |
1888 | } | |
1889 | ||
181a9a04 | 1890 | status = dlm_launch_thread(dlm); |
007dce53 SM |
1891 | if (status < 0) { |
1892 | mlog_errno(status); | |
1893 | goto bail; | |
1894 | } | |
1895 | ||
181a9a04 | 1896 | status = dlm_launch_recovery_thread(dlm); |
6714d8e8 KH |
1897 | if (status < 0) { |
1898 | mlog_errno(status); | |
1899 | goto bail; | |
1900 | } | |
1901 | ||
181a9a04 | 1902 | status = dlm_debug_init(dlm); |
6714d8e8 KH |
1903 | if (status < 0) { |
1904 | mlog_errno(status); | |
1905 | goto bail; | |
1906 | } | |
1907 | ||
5afc44e2 JQ |
1908 | snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name); |
1909 | dlm->dlm_worker = create_singlethread_workqueue(wq_name); | |
3156d267 KH |
1910 | if (!dlm->dlm_worker) { |
1911 | status = -ENOMEM; | |
1912 | mlog_errno(status); | |
1913 | goto bail; | |
1914 | } | |
1915 | ||
6714d8e8 | 1916 | do { |
6714d8e8 KH |
1917 | status = dlm_try_to_join_domain(dlm); |
1918 | ||
1919 | /* If we're racing another node to the join, then we | |
1920 | * need to back off temporarily and let them | |
1921 | * complete. */ | |
0dd82141 | 1922 | #define DLM_JOIN_TIMEOUT_MSECS 90000 |
6714d8e8 KH |
1923 | if (status == -EAGAIN) { |
1924 | if (signal_pending(current)) { | |
1925 | status = -ERESTARTSYS; | |
1926 | goto bail; | |
1927 | } | |
1928 | ||
7567c148 | 1929 | if (total_backoff > DLM_JOIN_TIMEOUT_MSECS) { |
0dd82141 SM |
1930 | status = -ERESTARTSYS; |
1931 | mlog(ML_NOTICE, "Timed out joining dlm domain " | |
1932 | "%s after %u msecs\n", dlm->name, | |
7567c148 | 1933 | total_backoff); |
0dd82141 SM |
1934 | goto bail; |
1935 | } | |
1936 | ||
6714d8e8 KH |
1937 | /* |
1938 | * <chip> After you! | |
1939 | * <dale> No, after you! | |
1940 | * <chip> I insist! | |
1941 | * <dale> But you first! | |
1942 | * ... | |
1943 | */ | |
1944 | backoff = (unsigned int)(jiffies & 0x3); | |
1945 | backoff *= DLM_DOMAIN_BACKOFF_MS; | |
0dd82141 | 1946 | total_backoff += backoff; |
6714d8e8 KH |
1947 | mlog(0, "backoff %d\n", backoff); |
1948 | msleep(backoff); | |
1949 | } | |
1950 | } while (status == -EAGAIN); | |
1951 | ||
1952 | if (status < 0) { | |
1953 | mlog_errno(status); | |
1954 | goto bail; | |
1955 | } | |
1956 | ||
1957 | status = 0; | |
1958 | bail: | |
1959 | wake_up(&dlm_domain_events); | |
1960 | ||
1961 | if (status) { | |
1962 | dlm_unregister_domain_handlers(dlm); | |
007dce53 | 1963 | dlm_debug_shutdown(dlm); |
6714d8e8 KH |
1964 | dlm_complete_thread(dlm); |
1965 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 1966 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
1967 | } |
1968 | ||
1969 | return status; | |
1970 | } | |
1971 | ||
1972 | static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain, | |
1973 | u32 key) | |
1974 | { | |
1975 | int i; | |
6325b4a2 | 1976 | int ret; |
6714d8e8 KH |
1977 | struct dlm_ctxt *dlm = NULL; |
1978 | ||
cd861280 | 1979 | dlm = kzalloc(sizeof(*dlm), GFP_KERNEL); |
6714d8e8 | 1980 | if (!dlm) { |
190a7721 JQ |
1981 | ret = -ENOMEM; |
1982 | mlog_errno(ret); | |
6714d8e8 KH |
1983 | goto leave; |
1984 | } | |
1985 | ||
316ce2ba | 1986 | dlm->name = kstrdup(domain, GFP_KERNEL); |
6714d8e8 | 1987 | if (dlm->name == NULL) { |
190a7721 JQ |
1988 | ret = -ENOMEM; |
1989 | mlog_errno(ret); | |
6714d8e8 KH |
1990 | goto leave; |
1991 | } | |
1992 | ||
03d864c0 | 1993 | dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES); |
81f2094a | 1994 | if (!dlm->lockres_hash) { |
190a7721 JQ |
1995 | ret = -ENOMEM; |
1996 | mlog_errno(ret); | |
6714d8e8 KH |
1997 | goto leave; |
1998 | } | |
6714d8e8 | 1999 | |
03d864c0 DP |
2000 | for (i = 0; i < DLM_HASH_BUCKETS; i++) |
2001 | INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i)); | |
6714d8e8 | 2002 | |
e2b66ddc SM |
2003 | dlm->master_hash = (struct hlist_head **) |
2004 | dlm_alloc_pagevec(DLM_HASH_PAGES); | |
2005 | if (!dlm->master_hash) { | |
190a7721 JQ |
2006 | ret = -ENOMEM; |
2007 | mlog_errno(ret); | |
e2b66ddc SM |
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 | 2017 | ret = dlm_create_debugfs_subroot(dlm); |
190a7721 | 2018 | if (ret < 0) |
6325b4a2 | 2019 | goto leave; |
6325b4a2 | 2020 | |
6714d8e8 KH |
2021 | spin_lock_init(&dlm->spinlock); |
2022 | spin_lock_init(&dlm->master_lock); | |
2023 | spin_lock_init(&dlm->ast_lock); | |
b0d4f817 | 2024 | spin_lock_init(&dlm->track_lock); |
6714d8e8 KH |
2025 | INIT_LIST_HEAD(&dlm->list); |
2026 | INIT_LIST_HEAD(&dlm->dirty_list); | |
2027 | INIT_LIST_HEAD(&dlm->reco.resources); | |
6714d8e8 KH |
2028 | INIT_LIST_HEAD(&dlm->reco.node_data); |
2029 | INIT_LIST_HEAD(&dlm->purge_list); | |
2030 | INIT_LIST_HEAD(&dlm->dlm_domain_handlers); | |
29576f8b | 2031 | INIT_LIST_HEAD(&dlm->tracking_list); |
6714d8e8 KH |
2032 | dlm->reco.state = 0; |
2033 | ||
2034 | INIT_LIST_HEAD(&dlm->pending_asts); | |
2035 | INIT_LIST_HEAD(&dlm->pending_basts); | |
2036 | ||
2037 | mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n", | |
2038 | dlm->recovery_map, &(dlm->recovery_map[0])); | |
2039 | ||
2040 | memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map)); | |
2041 | memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map)); | |
2042 | memset(dlm->domain_map, 0, sizeof(dlm->domain_map)); | |
2043 | ||
2044 | dlm->dlm_thread_task = NULL; | |
2045 | dlm->dlm_reco_thread_task = NULL; | |
3156d267 | 2046 | dlm->dlm_worker = NULL; |
6714d8e8 KH |
2047 | init_waitqueue_head(&dlm->dlm_thread_wq); |
2048 | init_waitqueue_head(&dlm->dlm_reco_thread_wq); | |
2049 | init_waitqueue_head(&dlm->reco.event); | |
2050 | init_waitqueue_head(&dlm->ast_wq); | |
2051 | init_waitqueue_head(&dlm->migration_wq); | |
6714d8e8 KH |
2052 | INIT_LIST_HEAD(&dlm->mle_hb_events); |
2053 | ||
2054 | dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN; | |
2055 | init_waitqueue_head(&dlm->dlm_join_events); | |
2056 | ||
2057 | dlm->reco.new_master = O2NM_INVALID_NODE_NUM; | |
2058 | dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; | |
6714d8e8 | 2059 | |
6800791a SM |
2060 | atomic_set(&dlm->res_tot_count, 0); |
2061 | atomic_set(&dlm->res_cur_count, 0); | |
2041d8fd SM |
2062 | for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) { |
2063 | atomic_set(&dlm->mle_tot_count[i], 0); | |
2064 | atomic_set(&dlm->mle_cur_count[i], 0); | |
2065 | } | |
2066 | ||
6714d8e8 KH |
2067 | spin_lock_init(&dlm->work_lock); |
2068 | INIT_LIST_HEAD(&dlm->work_list); | |
c4028958 | 2069 | INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work); |
6714d8e8 KH |
2070 | |
2071 | kref_init(&dlm->dlm_refs); | |
2072 | dlm->dlm_state = DLM_CTXT_NEW; | |
2073 | ||
2074 | INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks); | |
2075 | ||
2076 | mlog(0, "context init: refcount %u\n", | |
2077 | atomic_read(&dlm->dlm_refs.refcount)); | |
2078 | ||
2079 | leave: | |
190a7721 JQ |
2080 | if (ret < 0 && dlm) { |
2081 | if (dlm->master_hash) | |
2082 | dlm_free_pagevec((void **)dlm->master_hash, | |
2083 | DLM_HASH_PAGES); | |
2084 | ||
2085 | if (dlm->lockres_hash) | |
2086 | dlm_free_pagevec((void **)dlm->lockres_hash, | |
2087 | DLM_HASH_PAGES); | |
2088 | ||
2089 | kfree(dlm->name); | |
2090 | kfree(dlm); | |
2091 | dlm = NULL; | |
2092 | } | |
6714d8e8 KH |
2093 | return dlm; |
2094 | } | |
2095 | ||
2096 | /* | |
d24fbcda JB |
2097 | * Compare a requested locking protocol version against the current one. |
2098 | * | |
2099 | * If the major numbers are different, they are incompatible. | |
2100 | * If the current minor is greater than the request, they are incompatible. | |
2101 | * If the current minor is less than or equal to the request, they are | |
2102 | * compatible, and the requester should run at the current minor version. | |
2103 | */ | |
2104 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, | |
2105 | struct dlm_protocol_version *request) | |
2106 | { | |
2107 | if (existing->pv_major != request->pv_major) | |
2108 | return 1; | |
2109 | ||
2110 | if (existing->pv_minor > request->pv_minor) | |
2111 | return 1; | |
2112 | ||
2113 | if (existing->pv_minor < request->pv_minor) | |
2114 | request->pv_minor = existing->pv_minor; | |
2115 | ||
2116 | return 0; | |
2117 | } | |
2118 | ||
2119 | /* | |
2120 | * dlm_register_domain: one-time setup per "domain". | |
2121 | * | |
2122 | * The filesystem passes in the requested locking version via proto. | |
2123 | * If registration was successful, proto will contain the negotiated | |
2124 | * locking protocol. | |
6714d8e8 KH |
2125 | */ |
2126 | struct dlm_ctxt * dlm_register_domain(const char *domain, | |
d24fbcda JB |
2127 | u32 key, |
2128 | struct dlm_protocol_version *fs_proto) | |
6714d8e8 KH |
2129 | { |
2130 | int ret; | |
2131 | struct dlm_ctxt *dlm = NULL; | |
2132 | struct dlm_ctxt *new_ctxt = NULL; | |
2133 | ||
e372357b | 2134 | if (strlen(domain) >= O2NM_MAX_NAME_LEN) { |
6714d8e8 KH |
2135 | ret = -ENAMETOOLONG; |
2136 | mlog(ML_ERROR, "domain name length too long\n"); | |
2137 | goto leave; | |
2138 | } | |
2139 | ||
6714d8e8 KH |
2140 | mlog(0, "register called for domain \"%s\"\n", domain); |
2141 | ||
2142 | retry: | |
2143 | dlm = NULL; | |
2144 | if (signal_pending(current)) { | |
2145 | ret = -ERESTARTSYS; | |
2146 | mlog_errno(ret); | |
2147 | goto leave; | |
2148 | } | |
2149 | ||
2150 | spin_lock(&dlm_domain_lock); | |
2151 | ||
2152 | dlm = __dlm_lookup_domain(domain); | |
2153 | if (dlm) { | |
2154 | if (dlm->dlm_state != DLM_CTXT_JOINED) { | |
2155 | spin_unlock(&dlm_domain_lock); | |
2156 | ||
2157 | mlog(0, "This ctxt is not joined yet!\n"); | |
2158 | wait_event_interruptible(dlm_domain_events, | |
2159 | dlm_wait_on_domain_helper( | |
2160 | domain)); | |
2161 | goto retry; | |
2162 | } | |
2163 | ||
d24fbcda | 2164 | if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) { |
6469272c | 2165 | spin_unlock(&dlm_domain_lock); |
d24fbcda JB |
2166 | mlog(ML_ERROR, |
2167 | "Requested locking protocol version is not " | |
2168 | "compatible with already registered domain " | |
2169 | "\"%s\"\n", domain); | |
2170 | ret = -EPROTO; | |
2171 | goto leave; | |
2172 | } | |
2173 | ||
6714d8e8 KH |
2174 | __dlm_get(dlm); |
2175 | dlm->num_joins++; | |
2176 | ||
2177 | spin_unlock(&dlm_domain_lock); | |
2178 | ||
2179 | ret = 0; | |
2180 | goto leave; | |
2181 | } | |
2182 | ||
2183 | /* doesn't exist */ | |
2184 | if (!new_ctxt) { | |
2185 | spin_unlock(&dlm_domain_lock); | |
2186 | ||
2187 | new_ctxt = dlm_alloc_ctxt(domain, key); | |
2188 | if (new_ctxt) | |
2189 | goto retry; | |
2190 | ||
2191 | ret = -ENOMEM; | |
2192 | mlog_errno(ret); | |
2193 | goto leave; | |
2194 | } | |
2195 | ||
2196 | /* a little variable switch-a-roo here... */ | |
2197 | dlm = new_ctxt; | |
2198 | new_ctxt = NULL; | |
2199 | ||
2200 | /* add the new domain */ | |
2201 | list_add_tail(&dlm->list, &dlm_domains); | |
2202 | spin_unlock(&dlm_domain_lock); | |
2203 | ||
d24fbcda JB |
2204 | /* |
2205 | * Pass the locking protocol version into the join. If the join | |
2206 | * succeeds, it will have the negotiated protocol set. | |
2207 | */ | |
2208 | dlm->dlm_locking_proto = dlm_protocol; | |
2209 | dlm->fs_locking_proto = *fs_proto; | |
2210 | ||
6714d8e8 KH |
2211 | ret = dlm_join_domain(dlm); |
2212 | if (ret) { | |
2213 | mlog_errno(ret); | |
2214 | dlm_put(dlm); | |
2215 | goto leave; | |
2216 | } | |
2217 | ||
d24fbcda JB |
2218 | /* Tell the caller what locking protocol we negotiated */ |
2219 | *fs_proto = dlm->fs_locking_proto; | |
2220 | ||
6714d8e8 KH |
2221 | ret = 0; |
2222 | leave: | |
2223 | if (new_ctxt) | |
2224 | dlm_free_ctxt_mem(new_ctxt); | |
2225 | ||
2226 | if (ret < 0) | |
2227 | dlm = ERR_PTR(ret); | |
2228 | ||
2229 | return dlm; | |
2230 | } | |
2231 | EXPORT_SYMBOL_GPL(dlm_register_domain); | |
2232 | ||
2233 | static LIST_HEAD(dlm_join_handlers); | |
2234 | ||
2235 | static void dlm_unregister_net_handlers(void) | |
2236 | { | |
2237 | o2net_unregister_handler_list(&dlm_join_handlers); | |
2238 | } | |
2239 | ||
2240 | static int dlm_register_net_handlers(void) | |
2241 | { | |
2242 | int status = 0; | |
2243 | ||
2244 | status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, | |
2245 | sizeof(struct dlm_query_join_request), | |
2246 | dlm_query_join_handler, | |
d74c9803 | 2247 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
2248 | if (status) |
2249 | goto bail; | |
2250 | ||
2251 | status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
2252 | sizeof(struct dlm_assert_joined), | |
2253 | dlm_assert_joined_handler, | |
d74c9803 | 2254 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
2255 | if (status) |
2256 | goto bail; | |
2257 | ||
2258 | status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
2259 | sizeof(struct dlm_cancel_join), | |
2260 | dlm_cancel_join_handler, | |
d74c9803 | 2261 | NULL, NULL, &dlm_join_handlers); |
ea203441 SM |
2262 | if (status) |
2263 | goto bail; | |
2264 | ||
2265 | status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY, | |
2266 | sizeof(struct dlm_query_region), | |
2267 | dlm_query_region_handler, | |
2268 | NULL, NULL, &dlm_join_handlers); | |
6714d8e8 | 2269 | |
18cfdf1b SM |
2270 | if (status) |
2271 | goto bail; | |
2272 | ||
2273 | status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY, | |
2274 | sizeof(struct dlm_query_nodeinfo), | |
2275 | dlm_query_nodeinfo_handler, | |
2276 | NULL, NULL, &dlm_join_handlers); | |
6714d8e8 KH |
2277 | bail: |
2278 | if (status < 0) | |
2279 | dlm_unregister_net_handlers(); | |
2280 | ||
2281 | return status; | |
2282 | } | |
2283 | ||
2284 | /* Domain eviction callback handling. | |
2285 | * | |
2286 | * The file system requires notification of node death *before* the | |
2287 | * dlm completes it's recovery work, otherwise it may be able to | |
2288 | * acquire locks on resources requiring recovery. Since the dlm can | |
2289 | * evict a node from it's domain *before* heartbeat fires, a similar | |
2290 | * mechanism is required. */ | |
2291 | ||
2292 | /* Eviction is not expected to happen often, so a per-domain lock is | |
2293 | * not necessary. Eviction callbacks are allowed to sleep for short | |
2294 | * periods of time. */ | |
2295 | static DECLARE_RWSEM(dlm_callback_sem); | |
2296 | ||
2297 | void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm, | |
2298 | int node_num) | |
2299 | { | |
6714d8e8 KH |
2300 | struct dlm_eviction_cb *cb; |
2301 | ||
2302 | down_read(&dlm_callback_sem); | |
df53cd3b | 2303 | list_for_each_entry(cb, &dlm->dlm_eviction_callbacks, ec_item) { |
6714d8e8 KH |
2304 | cb->ec_func(node_num, cb->ec_data); |
2305 | } | |
2306 | up_read(&dlm_callback_sem); | |
2307 | } | |
2308 | ||
2309 | void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb, | |
2310 | dlm_eviction_func *f, | |
2311 | void *data) | |
2312 | { | |
2313 | INIT_LIST_HEAD(&cb->ec_item); | |
2314 | cb->ec_func = f; | |
2315 | cb->ec_data = data; | |
2316 | } | |
2317 | EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb); | |
2318 | ||
2319 | void dlm_register_eviction_cb(struct dlm_ctxt *dlm, | |
2320 | struct dlm_eviction_cb *cb) | |
2321 | { | |
2322 | down_write(&dlm_callback_sem); | |
2323 | list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks); | |
2324 | up_write(&dlm_callback_sem); | |
2325 | } | |
2326 | EXPORT_SYMBOL_GPL(dlm_register_eviction_cb); | |
2327 | ||
2328 | void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb) | |
2329 | { | |
2330 | down_write(&dlm_callback_sem); | |
2331 | list_del_init(&cb->ec_item); | |
2332 | up_write(&dlm_callback_sem); | |
2333 | } | |
2334 | EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb); | |
2335 | ||
2336 | static int __init dlm_init(void) | |
2337 | { | |
2338 | int status; | |
2339 | ||
6714d8e8 | 2340 | status = dlm_init_mle_cache(); |
12eb0035 SM |
2341 | if (status) { |
2342 | mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n"); | |
724bdca9 SM |
2343 | goto error; |
2344 | } | |
2345 | ||
2346 | status = dlm_init_master_caches(); | |
2347 | if (status) { | |
2348 | mlog(ML_ERROR, "Could not create o2dlm_lockres and " | |
2349 | "o2dlm_lockname slabcaches\n"); | |
2350 | goto error; | |
2351 | } | |
2352 | ||
2353 | status = dlm_init_lock_cache(); | |
2354 | if (status) { | |
2355 | mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n"); | |
2356 | goto error; | |
12eb0035 | 2357 | } |
6714d8e8 KH |
2358 | |
2359 | status = dlm_register_net_handlers(); | |
2360 | if (status) { | |
724bdca9 SM |
2361 | mlog(ML_ERROR, "Unable to register network handlers\n"); |
2362 | goto error; | |
6714d8e8 KH |
2363 | } |
2364 | ||
6325b4a2 SM |
2365 | status = dlm_create_debugfs_root(); |
2366 | if (status) | |
2367 | goto error; | |
2368 | ||
6714d8e8 | 2369 | return 0; |
724bdca9 | 2370 | error: |
6325b4a2 | 2371 | dlm_unregister_net_handlers(); |
724bdca9 SM |
2372 | dlm_destroy_lock_cache(); |
2373 | dlm_destroy_master_caches(); | |
2374 | dlm_destroy_mle_cache(); | |
2375 | return -1; | |
6714d8e8 KH |
2376 | } |
2377 | ||
2378 | static void __exit dlm_exit (void) | |
2379 | { | |
6325b4a2 | 2380 | dlm_destroy_debugfs_root(); |
6714d8e8 | 2381 | dlm_unregister_net_handlers(); |
724bdca9 SM |
2382 | dlm_destroy_lock_cache(); |
2383 | dlm_destroy_master_caches(); | |
6714d8e8 KH |
2384 | dlm_destroy_mle_cache(); |
2385 | } | |
2386 | ||
2387 | MODULE_AUTHOR("Oracle"); | |
2388 | MODULE_LICENSE("GPL"); | |
ff8fb335 | 2389 | MODULE_DESCRIPTION("OCFS2 Distributed Lock Management"); |
6714d8e8 KH |
2390 | |
2391 | module_init(dlm_init); | |
2392 | module_exit(dlm_exit); |