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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> | |
31 | #include <linux/utsname.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/delay.h> | |
35 | #include <linux/err.h> | |
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" | |
43 | ||
6714d8e8 KH |
44 | #include "dlmdomain.h" |
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. | |
131 | */ | |
132 | static const struct dlm_protocol_version dlm_protocol = { | |
133 | .pv_major = 1, | |
134 | .pv_minor = 0, | |
135 | }; | |
136 | ||
6714d8e8 KH |
137 | #define DLM_DOMAIN_BACKOFF_MS 200 |
138 | ||
d74c9803 KH |
139 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
140 | void **ret_data); | |
141 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, | |
142 | void **ret_data); | |
143 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, | |
144 | void **ret_data); | |
145 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, | |
146 | void **ret_data); | |
d24fbcda JB |
147 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, |
148 | struct dlm_protocol_version *request); | |
6714d8e8 KH |
149 | |
150 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm); | |
151 | ||
152 | void __dlm_unhash_lockres(struct dlm_lock_resource *lockres) | |
153 | { | |
78062cb2 SM |
154 | if (!hlist_unhashed(&lockres->hash_node)) { |
155 | hlist_del_init(&lockres->hash_node); | |
156 | dlm_lockres_put(lockres); | |
157 | } | |
6714d8e8 KH |
158 | } |
159 | ||
160 | void __dlm_insert_lockres(struct dlm_ctxt *dlm, | |
161 | struct dlm_lock_resource *res) | |
162 | { | |
81f2094a | 163 | struct hlist_head *bucket; |
6714d8e8 KH |
164 | struct qstr *q; |
165 | ||
166 | assert_spin_locked(&dlm->spinlock); | |
167 | ||
168 | q = &res->lockname; | |
03d864c0 | 169 | bucket = dlm_lockres_hash(dlm, q->hash); |
6714d8e8 KH |
170 | |
171 | /* get a reference for our hashtable */ | |
172 | dlm_lockres_get(res); | |
173 | ||
81f2094a | 174 | hlist_add_head(&res->hash_node, bucket); |
6714d8e8 KH |
175 | } |
176 | ||
ba2bf218 KH |
177 | struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm, |
178 | const char *name, | |
179 | unsigned int len, | |
180 | unsigned int hash) | |
6714d8e8 | 181 | { |
81f2094a | 182 | struct hlist_head *bucket; |
4198985f | 183 | struct hlist_node *list; |
6714d8e8 KH |
184 | |
185 | mlog_entry("%.*s\n", len, name); | |
186 | ||
187 | assert_spin_locked(&dlm->spinlock); | |
188 | ||
03d864c0 DP |
189 | bucket = dlm_lockres_hash(dlm, hash); |
190 | ||
4198985f DP |
191 | hlist_for_each(list, bucket) { |
192 | struct dlm_lock_resource *res = hlist_entry(list, | |
193 | struct dlm_lock_resource, hash_node); | |
194 | if (res->lockname.name[0] != name[0]) | |
195 | continue; | |
196 | if (unlikely(res->lockname.len != len)) | |
197 | continue; | |
198 | if (memcmp(res->lockname.name + 1, name + 1, len - 1)) | |
199 | continue; | |
200 | dlm_lockres_get(res); | |
201 | return res; | |
6714d8e8 | 202 | } |
4198985f | 203 | return NULL; |
6714d8e8 KH |
204 | } |
205 | ||
ba2bf218 KH |
206 | /* intended to be called by functions which do not care about lock |
207 | * resources which are being purged (most net _handler functions). | |
208 | * this will return NULL for any lock resource which is found but | |
209 | * currently in the process of dropping its mastery reference. | |
210 | * use __dlm_lookup_lockres_full when you need the lock resource | |
211 | * regardless (e.g. dlm_get_lock_resource) */ | |
212 | struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, | |
213 | const char *name, | |
214 | unsigned int len, | |
215 | unsigned int hash) | |
216 | { | |
217 | struct dlm_lock_resource *res = NULL; | |
218 | ||
219 | mlog_entry("%.*s\n", len, name); | |
220 | ||
221 | assert_spin_locked(&dlm->spinlock); | |
222 | ||
223 | res = __dlm_lookup_lockres_full(dlm, name, len, hash); | |
224 | if (res) { | |
225 | spin_lock(&res->spinlock); | |
226 | if (res->state & DLM_LOCK_RES_DROPPING_REF) { | |
227 | spin_unlock(&res->spinlock); | |
228 | dlm_lockres_put(res); | |
229 | return NULL; | |
230 | } | |
231 | spin_unlock(&res->spinlock); | |
232 | } | |
233 | ||
234 | return res; | |
235 | } | |
236 | ||
6714d8e8 KH |
237 | struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, |
238 | const char *name, | |
239 | unsigned int len) | |
240 | { | |
241 | struct dlm_lock_resource *res; | |
a3d33291 | 242 | unsigned int hash = dlm_lockid_hash(name, len); |
6714d8e8 KH |
243 | |
244 | spin_lock(&dlm->spinlock); | |
a3d33291 | 245 | res = __dlm_lookup_lockres(dlm, name, len, hash); |
6714d8e8 KH |
246 | spin_unlock(&dlm->spinlock); |
247 | return res; | |
248 | } | |
249 | ||
250 | static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len) | |
251 | { | |
252 | struct dlm_ctxt *tmp = NULL; | |
253 | struct list_head *iter; | |
254 | ||
255 | assert_spin_locked(&dlm_domain_lock); | |
256 | ||
257 | /* tmp->name here is always NULL terminated, | |
258 | * but domain may not be! */ | |
259 | list_for_each(iter, &dlm_domains) { | |
260 | tmp = list_entry (iter, struct dlm_ctxt, list); | |
261 | if (strlen(tmp->name) == len && | |
262 | memcmp(tmp->name, domain, len)==0) | |
263 | break; | |
264 | tmp = NULL; | |
265 | } | |
266 | ||
267 | return tmp; | |
268 | } | |
269 | ||
270 | /* For null terminated domain strings ONLY */ | |
271 | static struct dlm_ctxt * __dlm_lookup_domain(const char *domain) | |
272 | { | |
273 | assert_spin_locked(&dlm_domain_lock); | |
274 | ||
275 | return __dlm_lookup_domain_full(domain, strlen(domain)); | |
276 | } | |
277 | ||
278 | ||
279 | /* returns true on one of two conditions: | |
280 | * 1) the domain does not exist | |
281 | * 2) the domain exists and it's state is "joined" */ | |
282 | static int dlm_wait_on_domain_helper(const char *domain) | |
283 | { | |
284 | int ret = 0; | |
285 | struct dlm_ctxt *tmp = NULL; | |
286 | ||
287 | spin_lock(&dlm_domain_lock); | |
288 | ||
289 | tmp = __dlm_lookup_domain(domain); | |
290 | if (!tmp) | |
291 | ret = 1; | |
292 | else if (tmp->dlm_state == DLM_CTXT_JOINED) | |
293 | ret = 1; | |
294 | ||
295 | spin_unlock(&dlm_domain_lock); | |
296 | return ret; | |
297 | } | |
298 | ||
299 | static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm) | |
300 | { | |
81f2094a | 301 | if (dlm->lockres_hash) |
03d864c0 | 302 | dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES); |
6714d8e8 KH |
303 | |
304 | if (dlm->name) | |
305 | kfree(dlm->name); | |
306 | ||
307 | kfree(dlm); | |
308 | } | |
309 | ||
310 | /* A little strange - this function will be called while holding | |
311 | * dlm_domain_lock and is expected to be holding it on the way out. We | |
312 | * will however drop and reacquire it multiple times */ | |
313 | static void dlm_ctxt_release(struct kref *kref) | |
314 | { | |
315 | struct dlm_ctxt *dlm; | |
316 | ||
317 | dlm = container_of(kref, struct dlm_ctxt, dlm_refs); | |
318 | ||
319 | BUG_ON(dlm->num_joins); | |
320 | BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED); | |
321 | ||
322 | /* we may still be in the list if we hit an error during join. */ | |
323 | list_del_init(&dlm->list); | |
324 | ||
325 | spin_unlock(&dlm_domain_lock); | |
326 | ||
327 | mlog(0, "freeing memory from domain %s\n", dlm->name); | |
328 | ||
329 | wake_up(&dlm_domain_events); | |
330 | ||
331 | dlm_free_ctxt_mem(dlm); | |
332 | ||
333 | spin_lock(&dlm_domain_lock); | |
334 | } | |
335 | ||
336 | void dlm_put(struct dlm_ctxt *dlm) | |
337 | { | |
338 | spin_lock(&dlm_domain_lock); | |
339 | kref_put(&dlm->dlm_refs, dlm_ctxt_release); | |
340 | spin_unlock(&dlm_domain_lock); | |
341 | } | |
342 | ||
343 | static void __dlm_get(struct dlm_ctxt *dlm) | |
344 | { | |
345 | kref_get(&dlm->dlm_refs); | |
346 | } | |
347 | ||
348 | /* given a questionable reference to a dlm object, gets a reference if | |
349 | * it can find it in the list, otherwise returns NULL in which case | |
350 | * you shouldn't trust your pointer. */ | |
351 | struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm) | |
352 | { | |
353 | struct list_head *iter; | |
354 | struct dlm_ctxt *target = NULL; | |
355 | ||
356 | spin_lock(&dlm_domain_lock); | |
357 | ||
358 | list_for_each(iter, &dlm_domains) { | |
359 | target = list_entry (iter, struct dlm_ctxt, list); | |
360 | ||
361 | if (target == dlm) { | |
362 | __dlm_get(target); | |
363 | break; | |
364 | } | |
365 | ||
366 | target = NULL; | |
367 | } | |
368 | ||
369 | spin_unlock(&dlm_domain_lock); | |
370 | ||
371 | return target; | |
372 | } | |
373 | ||
374 | int dlm_domain_fully_joined(struct dlm_ctxt *dlm) | |
375 | { | |
376 | int ret; | |
377 | ||
378 | spin_lock(&dlm_domain_lock); | |
379 | ret = (dlm->dlm_state == DLM_CTXT_JOINED) || | |
380 | (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN); | |
381 | spin_unlock(&dlm_domain_lock); | |
382 | ||
383 | return ret; | |
384 | } | |
385 | ||
3156d267 KH |
386 | static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm) |
387 | { | |
388 | if (dlm->dlm_worker) { | |
389 | flush_workqueue(dlm->dlm_worker); | |
390 | destroy_workqueue(dlm->dlm_worker); | |
391 | dlm->dlm_worker = NULL; | |
392 | } | |
393 | } | |
394 | ||
6714d8e8 KH |
395 | static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm) |
396 | { | |
397 | dlm_unregister_domain_handlers(dlm); | |
398 | dlm_complete_thread(dlm); | |
399 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 400 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
401 | |
402 | /* We've left the domain. Now we can take ourselves out of the | |
403 | * list and allow the kref stuff to help us free the | |
404 | * memory. */ | |
405 | spin_lock(&dlm_domain_lock); | |
406 | list_del_init(&dlm->list); | |
407 | spin_unlock(&dlm_domain_lock); | |
408 | ||
409 | /* Wake up anyone waiting for us to remove this domain */ | |
410 | wake_up(&dlm_domain_events); | |
411 | } | |
412 | ||
ba2bf218 | 413 | static int dlm_migrate_all_locks(struct dlm_ctxt *dlm) |
6714d8e8 | 414 | { |
ba2bf218 | 415 | int i, num, n, ret = 0; |
6714d8e8 | 416 | struct dlm_lock_resource *res; |
ba2bf218 KH |
417 | struct hlist_node *iter; |
418 | struct hlist_head *bucket; | |
419 | int dropped; | |
6714d8e8 KH |
420 | |
421 | mlog(0, "Migrating locks from domain %s\n", dlm->name); | |
ba2bf218 KH |
422 | |
423 | num = 0; | |
6714d8e8 | 424 | spin_lock(&dlm->spinlock); |
81f2094a | 425 | for (i = 0; i < DLM_HASH_BUCKETS; i++) { |
ba2bf218 KH |
426 | redo_bucket: |
427 | n = 0; | |
428 | bucket = dlm_lockres_hash(dlm, i); | |
429 | iter = bucket->first; | |
430 | while (iter) { | |
431 | n++; | |
432 | res = hlist_entry(iter, struct dlm_lock_resource, | |
433 | hash_node); | |
6714d8e8 | 434 | dlm_lockres_get(res); |
ba2bf218 KH |
435 | /* migrate, if necessary. this will drop the dlm |
436 | * spinlock and retake it if it does migration. */ | |
437 | dropped = dlm_empty_lockres(dlm, res); | |
438 | ||
439 | spin_lock(&res->spinlock); | |
440 | __dlm_lockres_calc_usage(dlm, res); | |
441 | iter = res->hash_node.next; | |
442 | spin_unlock(&res->spinlock); | |
443 | ||
6714d8e8 | 444 | dlm_lockres_put(res); |
ba2bf218 | 445 | |
ba2bf218 KH |
446 | if (dropped) |
447 | goto redo_bucket; | |
6714d8e8 | 448 | } |
0d01af6e | 449 | cond_resched_lock(&dlm->spinlock); |
ba2bf218 KH |
450 | num += n; |
451 | mlog(0, "%s: touched %d lockreses in bucket %d " | |
452 | "(tot=%d)\n", dlm->name, n, i, num); | |
6714d8e8 KH |
453 | } |
454 | spin_unlock(&dlm->spinlock); | |
ba2bf218 KH |
455 | wake_up(&dlm->dlm_thread_wq); |
456 | ||
457 | /* let the dlm thread take care of purging, keep scanning until | |
458 | * nothing remains in the hash */ | |
459 | if (num) { | |
460 | mlog(0, "%s: %d lock resources in hash last pass\n", | |
461 | dlm->name, num); | |
462 | ret = -EAGAIN; | |
463 | } | |
6714d8e8 | 464 | mlog(0, "DONE Migrating locks from domain %s\n", dlm->name); |
ba2bf218 | 465 | return ret; |
6714d8e8 KH |
466 | } |
467 | ||
468 | static int dlm_no_joining_node(struct dlm_ctxt *dlm) | |
469 | { | |
470 | int ret; | |
471 | ||
472 | spin_lock(&dlm->spinlock); | |
473 | ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN; | |
474 | spin_unlock(&dlm->spinlock); | |
475 | ||
476 | return ret; | |
477 | } | |
478 | ||
479 | static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm) | |
480 | { | |
481 | /* Yikes, a double spinlock! I need domain_lock for the dlm | |
482 | * state and the dlm spinlock for join state... Sorry! */ | |
483 | again: | |
484 | spin_lock(&dlm_domain_lock); | |
485 | spin_lock(&dlm->spinlock); | |
486 | ||
487 | if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { | |
488 | mlog(0, "Node %d is joining, we wait on it.\n", | |
489 | dlm->joining_node); | |
490 | spin_unlock(&dlm->spinlock); | |
491 | spin_unlock(&dlm_domain_lock); | |
492 | ||
493 | wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm)); | |
494 | goto again; | |
495 | } | |
496 | ||
497 | dlm->dlm_state = DLM_CTXT_LEAVING; | |
498 | spin_unlock(&dlm->spinlock); | |
499 | spin_unlock(&dlm_domain_lock); | |
500 | } | |
501 | ||
502 | static void __dlm_print_nodes(struct dlm_ctxt *dlm) | |
503 | { | |
504 | int node = -1; | |
505 | ||
506 | assert_spin_locked(&dlm->spinlock); | |
507 | ||
781ee3e2 | 508 | printk(KERN_INFO "ocfs2_dlm: Nodes in domain (\"%s\"): ", dlm->name); |
6714d8e8 KH |
509 | |
510 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, | |
511 | node + 1)) < O2NM_MAX_NODES) { | |
781ee3e2 | 512 | printk("%d ", node); |
6714d8e8 | 513 | } |
781ee3e2 | 514 | printk("\n"); |
6714d8e8 KH |
515 | } |
516 | ||
d74c9803 KH |
517 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
518 | void **ret_data) | |
6714d8e8 KH |
519 | { |
520 | struct dlm_ctxt *dlm = data; | |
521 | unsigned int node; | |
522 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; | |
523 | ||
524 | mlog_entry("%p %u %p", msg, len, data); | |
525 | ||
526 | if (!dlm_grab(dlm)) | |
527 | return 0; | |
528 | ||
529 | node = exit_msg->node_idx; | |
530 | ||
781ee3e2 | 531 | printk(KERN_INFO "ocfs2_dlm: Node %u leaves domain %s\n", node, dlm->name); |
6714d8e8 KH |
532 | |
533 | spin_lock(&dlm->spinlock); | |
534 | clear_bit(node, dlm->domain_map); | |
535 | __dlm_print_nodes(dlm); | |
536 | ||
537 | /* notify anything attached to the heartbeat events */ | |
538 | dlm_hb_event_notify_attached(dlm, node, 0); | |
539 | ||
540 | spin_unlock(&dlm->spinlock); | |
541 | ||
542 | dlm_put(dlm); | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, | |
548 | unsigned int node) | |
549 | { | |
550 | int status; | |
551 | struct dlm_exit_domain leave_msg; | |
552 | ||
553 | mlog(0, "Asking node %u if we can leave the domain %s me = %u\n", | |
554 | node, dlm->name, dlm->node_num); | |
555 | ||
556 | memset(&leave_msg, 0, sizeof(leave_msg)); | |
557 | leave_msg.node_idx = dlm->node_num; | |
558 | ||
559 | status = o2net_send_message(DLM_EXIT_DOMAIN_MSG, dlm->key, | |
560 | &leave_msg, sizeof(leave_msg), node, | |
561 | NULL); | |
562 | ||
563 | mlog(0, "status return %d from o2net_send_message\n", status); | |
564 | ||
565 | return status; | |
566 | } | |
567 | ||
568 | ||
569 | static void dlm_leave_domain(struct dlm_ctxt *dlm) | |
570 | { | |
571 | int node, clear_node, status; | |
572 | ||
573 | /* At this point we've migrated away all our locks and won't | |
574 | * accept mastership of new ones. The dlm is responsible for | |
575 | * almost nothing now. We make sure not to confuse any joining | |
576 | * nodes and then commence shutdown procedure. */ | |
577 | ||
578 | spin_lock(&dlm->spinlock); | |
579 | /* Clear ourselves from the domain map */ | |
580 | clear_bit(dlm->node_num, dlm->domain_map); | |
581 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, | |
582 | 0)) < O2NM_MAX_NODES) { | |
583 | /* Drop the dlm spinlock. This is safe wrt the domain_map. | |
584 | * -nodes cannot be added now as the | |
585 | * query_join_handlers knows to respond with OK_NO_MAP | |
586 | * -we catch the right network errors if a node is | |
587 | * removed from the map while we're sending him the | |
588 | * exit message. */ | |
589 | spin_unlock(&dlm->spinlock); | |
590 | ||
591 | clear_node = 1; | |
592 | ||
593 | status = dlm_send_one_domain_exit(dlm, node); | |
594 | if (status < 0 && | |
595 | status != -ENOPROTOOPT && | |
596 | status != -ENOTCONN) { | |
597 | mlog(ML_NOTICE, "Error %d sending domain exit message " | |
598 | "to node %d\n", status, node); | |
599 | ||
600 | /* Not sure what to do here but lets sleep for | |
601 | * a bit in case this was a transient | |
602 | * error... */ | |
603 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
604 | clear_node = 0; | |
605 | } | |
606 | ||
607 | spin_lock(&dlm->spinlock); | |
608 | /* If we're not clearing the node bit then we intend | |
609 | * to loop back around to try again. */ | |
610 | if (clear_node) | |
611 | clear_bit(node, dlm->domain_map); | |
612 | } | |
613 | spin_unlock(&dlm->spinlock); | |
614 | } | |
615 | ||
616 | int dlm_joined(struct dlm_ctxt *dlm) | |
617 | { | |
618 | int ret = 0; | |
619 | ||
620 | spin_lock(&dlm_domain_lock); | |
621 | ||
622 | if (dlm->dlm_state == DLM_CTXT_JOINED) | |
623 | ret = 1; | |
624 | ||
625 | spin_unlock(&dlm_domain_lock); | |
626 | ||
627 | return ret; | |
628 | } | |
629 | ||
630 | int dlm_shutting_down(struct dlm_ctxt *dlm) | |
631 | { | |
632 | int ret = 0; | |
633 | ||
634 | spin_lock(&dlm_domain_lock); | |
635 | ||
636 | if (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN) | |
637 | ret = 1; | |
638 | ||
639 | spin_unlock(&dlm_domain_lock); | |
640 | ||
641 | return ret; | |
642 | } | |
643 | ||
644 | void dlm_unregister_domain(struct dlm_ctxt *dlm) | |
645 | { | |
646 | int leave = 0; | |
647 | ||
648 | spin_lock(&dlm_domain_lock); | |
649 | BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED); | |
650 | BUG_ON(!dlm->num_joins); | |
651 | ||
652 | dlm->num_joins--; | |
653 | if (!dlm->num_joins) { | |
654 | /* We mark it "in shutdown" now so new register | |
655 | * requests wait until we've completely left the | |
656 | * domain. Don't use DLM_CTXT_LEAVING yet as we still | |
657 | * want new domain joins to communicate with us at | |
658 | * least until we've completed migration of our | |
659 | * resources. */ | |
660 | dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN; | |
661 | leave = 1; | |
662 | } | |
663 | spin_unlock(&dlm_domain_lock); | |
664 | ||
665 | if (leave) { | |
666 | mlog(0, "shutting down domain %s\n", dlm->name); | |
667 | ||
668 | /* We changed dlm state, notify the thread */ | |
669 | dlm_kick_thread(dlm, NULL); | |
670 | ||
ba2bf218 | 671 | while (dlm_migrate_all_locks(dlm)) { |
2f5bf1f2 SM |
672 | /* Give dlm_thread time to purge the lockres' */ |
673 | msleep(500); | |
ba2bf218 KH |
674 | mlog(0, "%s: more migration to do\n", dlm->name); |
675 | } | |
6714d8e8 KH |
676 | dlm_mark_domain_leaving(dlm); |
677 | dlm_leave_domain(dlm); | |
678 | dlm_complete_dlm_shutdown(dlm); | |
679 | } | |
680 | dlm_put(dlm); | |
681 | } | |
682 | EXPORT_SYMBOL_GPL(dlm_unregister_domain); | |
683 | ||
d24fbcda JB |
684 | static int dlm_query_join_proto_check(char *proto_type, int node, |
685 | struct dlm_protocol_version *ours, | |
686 | struct dlm_protocol_version *request) | |
687 | { | |
688 | int rc; | |
689 | struct dlm_protocol_version proto = *request; | |
690 | ||
691 | if (!dlm_protocol_compare(ours, &proto)) { | |
692 | mlog(0, | |
693 | "node %u wanted to join with %s locking protocol " | |
694 | "%u.%u, we respond with %u.%u\n", | |
695 | node, proto_type, | |
696 | request->pv_major, | |
697 | request->pv_minor, | |
698 | proto.pv_major, proto.pv_minor); | |
699 | request->pv_minor = proto.pv_minor; | |
700 | rc = 0; | |
701 | } else { | |
702 | mlog(ML_NOTICE, | |
703 | "Node %u wanted to join with %s locking " | |
704 | "protocol %u.%u, but we have %u.%u, disallowing\n", | |
705 | node, proto_type, | |
706 | request->pv_major, | |
707 | request->pv_minor, | |
708 | ours->pv_major, | |
709 | ours->pv_minor); | |
710 | rc = 1; | |
711 | } | |
712 | ||
713 | return rc; | |
714 | } | |
715 | ||
d74c9803 KH |
716 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
717 | void **ret_data) | |
6714d8e8 KH |
718 | { |
719 | struct dlm_query_join_request *query; | |
d24fbcda JB |
720 | union dlm_query_join_response response = { |
721 | .packet.code = JOIN_DISALLOW, | |
722 | }; | |
6714d8e8 | 723 | struct dlm_ctxt *dlm = NULL; |
1faf2894 | 724 | u8 nodenum; |
6714d8e8 KH |
725 | |
726 | query = (struct dlm_query_join_request *) msg->buf; | |
727 | ||
728 | mlog(0, "node %u wants to join domain %s\n", query->node_idx, | |
729 | query->domain); | |
730 | ||
731 | /* | |
732 | * If heartbeat doesn't consider the node live, tell it | |
733 | * to back off and try again. This gives heartbeat a chance | |
734 | * to catch up. | |
735 | */ | |
736 | if (!o2hb_check_node_heartbeating(query->node_idx)) { | |
737 | mlog(0, "node %u is not in our live map yet\n", | |
738 | query->node_idx); | |
739 | ||
d24fbcda | 740 | response.packet.code = JOIN_DISALLOW; |
6714d8e8 KH |
741 | goto respond; |
742 | } | |
743 | ||
d24fbcda | 744 | response.packet.code = JOIN_OK_NO_MAP; |
6714d8e8 KH |
745 | |
746 | spin_lock(&dlm_domain_lock); | |
747 | dlm = __dlm_lookup_domain_full(query->domain, query->name_len); | |
1faf2894 SE |
748 | if (!dlm) |
749 | goto unlock_respond; | |
750 | ||
751 | /* | |
752 | * There is a small window where the joining node may not see the | |
753 | * node(s) that just left but still part of the cluster. DISALLOW | |
754 | * join request if joining node has different node map. | |
755 | */ | |
756 | nodenum=0; | |
757 | while (nodenum < O2NM_MAX_NODES) { | |
758 | if (test_bit(nodenum, dlm->domain_map)) { | |
759 | if (!byte_test_bit(nodenum, query->node_map)) { | |
e4968476 SM |
760 | mlog(0, "disallow join as node %u does not " |
761 | "have node %u in its nodemap\n", | |
762 | query->node_idx, nodenum); | |
d24fbcda | 763 | response.packet.code = JOIN_DISALLOW; |
1faf2894 SE |
764 | goto unlock_respond; |
765 | } | |
766 | } | |
767 | nodenum++; | |
768 | } | |
769 | ||
6714d8e8 | 770 | /* Once the dlm ctxt is marked as leaving then we don't want |
e2faea4c KH |
771 | * to be put in someone's domain map. |
772 | * Also, explicitly disallow joining at certain troublesome | |
773 | * times (ie. during recovery). */ | |
6714d8e8 | 774 | if (dlm && dlm->dlm_state != DLM_CTXT_LEAVING) { |
e2faea4c | 775 | int bit = query->node_idx; |
6714d8e8 KH |
776 | spin_lock(&dlm->spinlock); |
777 | ||
778 | if (dlm->dlm_state == DLM_CTXT_NEW && | |
779 | dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) { | |
780 | /*If this is a brand new context and we | |
781 | * haven't started our join process yet, then | |
782 | * the other node won the race. */ | |
d24fbcda | 783 | response.packet.code = JOIN_OK_NO_MAP; |
6714d8e8 KH |
784 | } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { |
785 | /* Disallow parallel joins. */ | |
d24fbcda | 786 | response.packet.code = JOIN_DISALLOW; |
e2faea4c | 787 | } else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) { |
e4968476 | 788 | mlog(0, "node %u trying to join, but recovery " |
e2faea4c | 789 | "is ongoing.\n", bit); |
d24fbcda | 790 | response.packet.code = JOIN_DISALLOW; |
e2faea4c | 791 | } else if (test_bit(bit, dlm->recovery_map)) { |
e4968476 | 792 | mlog(0, "node %u trying to join, but it " |
e2faea4c | 793 | "still needs recovery.\n", bit); |
d24fbcda | 794 | response.packet.code = JOIN_DISALLOW; |
e2faea4c | 795 | } else if (test_bit(bit, dlm->domain_map)) { |
e4968476 | 796 | mlog(0, "node %u trying to join, but it " |
e2faea4c KH |
797 | "is still in the domain! needs recovery?\n", |
798 | bit); | |
d24fbcda | 799 | response.packet.code = JOIN_DISALLOW; |
6714d8e8 KH |
800 | } else { |
801 | /* Alright we're fully a part of this domain | |
802 | * so we keep some state as to who's joining | |
803 | * and indicate to him that needs to be fixed | |
804 | * up. */ | |
d24fbcda JB |
805 | |
806 | /* Make sure we speak compatible locking protocols. */ | |
807 | if (dlm_query_join_proto_check("DLM", bit, | |
808 | &dlm->dlm_locking_proto, | |
809 | &query->dlm_proto)) { | |
810 | response.packet.code = | |
811 | JOIN_PROTOCOL_MISMATCH; | |
812 | } else if (dlm_query_join_proto_check("fs", bit, | |
813 | &dlm->fs_locking_proto, | |
814 | &query->fs_proto)) { | |
815 | response.packet.code = | |
816 | JOIN_PROTOCOL_MISMATCH; | |
817 | } else { | |
818 | response.packet.dlm_minor = | |
819 | query->dlm_proto.pv_minor; | |
820 | response.packet.fs_minor = | |
821 | query->fs_proto.pv_minor; | |
822 | response.packet.code = JOIN_OK; | |
823 | __dlm_set_joining_node(dlm, query->node_idx); | |
824 | } | |
6714d8e8 KH |
825 | } |
826 | ||
827 | spin_unlock(&dlm->spinlock); | |
828 | } | |
1faf2894 | 829 | unlock_respond: |
6714d8e8 KH |
830 | spin_unlock(&dlm_domain_lock); |
831 | ||
832 | respond: | |
d24fbcda | 833 | mlog(0, "We respond with %u\n", response.packet.code); |
6714d8e8 | 834 | |
d24fbcda | 835 | return response.intval; |
6714d8e8 KH |
836 | } |
837 | ||
d74c9803 KH |
838 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, |
839 | void **ret_data) | |
6714d8e8 KH |
840 | { |
841 | struct dlm_assert_joined *assert; | |
842 | struct dlm_ctxt *dlm = NULL; | |
843 | ||
844 | assert = (struct dlm_assert_joined *) msg->buf; | |
845 | ||
846 | mlog(0, "node %u asserts join on domain %s\n", assert->node_idx, | |
847 | assert->domain); | |
848 | ||
849 | spin_lock(&dlm_domain_lock); | |
850 | dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len); | |
851 | /* XXX should we consider no dlm ctxt an error? */ | |
852 | if (dlm) { | |
853 | spin_lock(&dlm->spinlock); | |
854 | ||
855 | /* Alright, this node has officially joined our | |
856 | * domain. Set him in the map and clean up our | |
857 | * leftover join state. */ | |
858 | BUG_ON(dlm->joining_node != assert->node_idx); | |
859 | set_bit(assert->node_idx, dlm->domain_map); | |
860 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
861 | ||
781ee3e2 SM |
862 | printk(KERN_INFO "ocfs2_dlm: Node %u joins domain %s\n", |
863 | assert->node_idx, dlm->name); | |
6714d8e8 KH |
864 | __dlm_print_nodes(dlm); |
865 | ||
866 | /* notify anything attached to the heartbeat events */ | |
867 | dlm_hb_event_notify_attached(dlm, assert->node_idx, 1); | |
868 | ||
869 | spin_unlock(&dlm->spinlock); | |
870 | } | |
871 | spin_unlock(&dlm_domain_lock); | |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
d74c9803 KH |
876 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, |
877 | void **ret_data) | |
6714d8e8 KH |
878 | { |
879 | struct dlm_cancel_join *cancel; | |
880 | struct dlm_ctxt *dlm = NULL; | |
881 | ||
882 | cancel = (struct dlm_cancel_join *) msg->buf; | |
883 | ||
884 | mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx, | |
885 | cancel->domain); | |
886 | ||
887 | spin_lock(&dlm_domain_lock); | |
888 | dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len); | |
889 | ||
890 | if (dlm) { | |
891 | spin_lock(&dlm->spinlock); | |
892 | ||
893 | /* Yikes, this guy wants to cancel his join. No | |
894 | * problem, we simply cleanup our join state. */ | |
895 | BUG_ON(dlm->joining_node != cancel->node_idx); | |
896 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
897 | ||
898 | spin_unlock(&dlm->spinlock); | |
899 | } | |
900 | spin_unlock(&dlm_domain_lock); | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
905 | static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm, | |
906 | unsigned int node) | |
907 | { | |
908 | int status; | |
909 | struct dlm_cancel_join cancel_msg; | |
910 | ||
911 | memset(&cancel_msg, 0, sizeof(cancel_msg)); | |
912 | cancel_msg.node_idx = dlm->node_num; | |
913 | cancel_msg.name_len = strlen(dlm->name); | |
914 | memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len); | |
915 | ||
916 | status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
917 | &cancel_msg, sizeof(cancel_msg), node, | |
918 | NULL); | |
919 | if (status < 0) { | |
920 | mlog_errno(status); | |
921 | goto bail; | |
922 | } | |
923 | ||
924 | bail: | |
925 | return status; | |
926 | } | |
927 | ||
928 | /* map_size should be in bytes. */ | |
929 | static int dlm_send_join_cancels(struct dlm_ctxt *dlm, | |
930 | unsigned long *node_map, | |
931 | unsigned int map_size) | |
932 | { | |
933 | int status, tmpstat; | |
934 | unsigned int node; | |
935 | ||
936 | if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) * | |
937 | sizeof(unsigned long))) { | |
938 | mlog(ML_ERROR, | |
939 | "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n", | |
940 | map_size, BITS_TO_LONGS(O2NM_MAX_NODES)); | |
941 | return -EINVAL; | |
942 | } | |
943 | ||
944 | status = 0; | |
945 | node = -1; | |
946 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, | |
947 | node + 1)) < O2NM_MAX_NODES) { | |
948 | if (node == dlm->node_num) | |
949 | continue; | |
950 | ||
951 | tmpstat = dlm_send_one_join_cancel(dlm, node); | |
952 | if (tmpstat) { | |
953 | mlog(ML_ERROR, "Error return %d cancelling join on " | |
954 | "node %d\n", tmpstat, node); | |
955 | if (!status) | |
956 | status = tmpstat; | |
957 | } | |
958 | } | |
959 | ||
960 | if (status) | |
961 | mlog_errno(status); | |
962 | return status; | |
963 | } | |
964 | ||
965 | static int dlm_request_join(struct dlm_ctxt *dlm, | |
966 | int node, | |
d24fbcda | 967 | enum dlm_query_join_response_code *response) |
6714d8e8 | 968 | { |
d24fbcda | 969 | int status; |
6714d8e8 | 970 | struct dlm_query_join_request join_msg; |
d24fbcda | 971 | union dlm_query_join_response join_resp; |
6714d8e8 KH |
972 | |
973 | mlog(0, "querying node %d\n", node); | |
974 | ||
975 | memset(&join_msg, 0, sizeof(join_msg)); | |
976 | join_msg.node_idx = dlm->node_num; | |
977 | join_msg.name_len = strlen(dlm->name); | |
978 | memcpy(join_msg.domain, dlm->name, join_msg.name_len); | |
d24fbcda JB |
979 | join_msg.dlm_proto = dlm->dlm_locking_proto; |
980 | join_msg.fs_proto = dlm->fs_locking_proto; | |
6714d8e8 | 981 | |
1faf2894 SE |
982 | /* copy live node map to join message */ |
983 | byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES); | |
984 | ||
6714d8e8 | 985 | status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg, |
d24fbcda JB |
986 | sizeof(join_msg), node, |
987 | &join_resp.intval); | |
6714d8e8 KH |
988 | if (status < 0 && status != -ENOPROTOOPT) { |
989 | mlog_errno(status); | |
990 | goto bail; | |
991 | } | |
992 | ||
993 | /* -ENOPROTOOPT from the net code means the other side isn't | |
994 | listening for our message type -- that's fine, it means | |
995 | his dlm isn't up, so we can consider him a 'yes' but not | |
996 | joined into the domain. */ | |
997 | if (status == -ENOPROTOOPT) { | |
998 | status = 0; | |
999 | *response = JOIN_OK_NO_MAP; | |
d24fbcda JB |
1000 | } else if (join_resp.packet.code == JOIN_DISALLOW || |
1001 | join_resp.packet.code == JOIN_OK_NO_MAP) { | |
1002 | *response = join_resp.packet.code; | |
1003 | } else if (join_resp.packet.code == JOIN_PROTOCOL_MISMATCH) { | |
1004 | mlog(ML_NOTICE, | |
1005 | "This node requested DLM locking protocol %u.%u and " | |
1006 | "filesystem locking protocol %u.%u. At least one of " | |
1007 | "the protocol versions on node %d is not compatible, " | |
1008 | "disconnecting\n", | |
1009 | dlm->dlm_locking_proto.pv_major, | |
1010 | dlm->dlm_locking_proto.pv_minor, | |
1011 | dlm->fs_locking_proto.pv_major, | |
1012 | dlm->fs_locking_proto.pv_minor, | |
1013 | node); | |
1014 | status = -EPROTO; | |
1015 | *response = join_resp.packet.code; | |
1016 | } else if (join_resp.packet.code == JOIN_OK) { | |
1017 | *response = join_resp.packet.code; | |
1018 | /* Use the same locking protocol as the remote node */ | |
1019 | dlm->dlm_locking_proto.pv_minor = | |
1020 | join_resp.packet.dlm_minor; | |
1021 | dlm->fs_locking_proto.pv_minor = | |
1022 | join_resp.packet.fs_minor; | |
1023 | mlog(0, | |
1024 | "Node %d responds JOIN_OK with DLM locking protocol " | |
1025 | "%u.%u and fs locking protocol %u.%u\n", | |
1026 | node, | |
1027 | dlm->dlm_locking_proto.pv_major, | |
1028 | dlm->dlm_locking_proto.pv_minor, | |
1029 | dlm->fs_locking_proto.pv_major, | |
1030 | dlm->fs_locking_proto.pv_minor); | |
6714d8e8 KH |
1031 | } else { |
1032 | status = -EINVAL; | |
d24fbcda JB |
1033 | mlog(ML_ERROR, "invalid response %d from node %u\n", |
1034 | join_resp.packet.code, node); | |
6714d8e8 KH |
1035 | } |
1036 | ||
1037 | mlog(0, "status %d, node %d response is %d\n", status, node, | |
1038 | *response); | |
1039 | ||
1040 | bail: | |
1041 | return status; | |
1042 | } | |
1043 | ||
1044 | static int dlm_send_one_join_assert(struct dlm_ctxt *dlm, | |
1045 | unsigned int node) | |
1046 | { | |
1047 | int status; | |
1048 | struct dlm_assert_joined assert_msg; | |
1049 | ||
1050 | mlog(0, "Sending join assert to node %u\n", node); | |
1051 | ||
1052 | memset(&assert_msg, 0, sizeof(assert_msg)); | |
1053 | assert_msg.node_idx = dlm->node_num; | |
1054 | assert_msg.name_len = strlen(dlm->name); | |
1055 | memcpy(assert_msg.domain, dlm->name, assert_msg.name_len); | |
1056 | ||
1057 | status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1058 | &assert_msg, sizeof(assert_msg), node, | |
1059 | NULL); | |
1060 | if (status < 0) | |
1061 | mlog_errno(status); | |
1062 | ||
1063 | return status; | |
1064 | } | |
1065 | ||
1066 | static void dlm_send_join_asserts(struct dlm_ctxt *dlm, | |
1067 | unsigned long *node_map) | |
1068 | { | |
1069 | int status, node, live; | |
1070 | ||
1071 | status = 0; | |
1072 | node = -1; | |
1073 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, | |
1074 | node + 1)) < O2NM_MAX_NODES) { | |
1075 | if (node == dlm->node_num) | |
1076 | continue; | |
1077 | ||
1078 | do { | |
1079 | /* It is very important that this message be | |
1080 | * received so we spin until either the node | |
1081 | * has died or it gets the message. */ | |
1082 | status = dlm_send_one_join_assert(dlm, node); | |
1083 | ||
1084 | spin_lock(&dlm->spinlock); | |
1085 | live = test_bit(node, dlm->live_nodes_map); | |
1086 | spin_unlock(&dlm->spinlock); | |
1087 | ||
1088 | if (status) { | |
1089 | mlog(ML_ERROR, "Error return %d asserting " | |
1090 | "join on node %d\n", status, node); | |
1091 | ||
1092 | /* give us some time between errors... */ | |
1093 | if (live) | |
1094 | msleep(DLM_DOMAIN_BACKOFF_MS); | |
1095 | } | |
1096 | } while (status && live); | |
1097 | } | |
1098 | } | |
1099 | ||
1100 | struct domain_join_ctxt { | |
1101 | unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1102 | unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1103 | }; | |
1104 | ||
1105 | static int dlm_should_restart_join(struct dlm_ctxt *dlm, | |
1106 | struct domain_join_ctxt *ctxt, | |
d24fbcda | 1107 | enum dlm_query_join_response_code response) |
6714d8e8 KH |
1108 | { |
1109 | int ret; | |
1110 | ||
1111 | if (response == JOIN_DISALLOW) { | |
1112 | mlog(0, "Latest response of disallow -- should restart\n"); | |
1113 | return 1; | |
1114 | } | |
1115 | ||
1116 | spin_lock(&dlm->spinlock); | |
1117 | /* For now, we restart the process if the node maps have | |
1118 | * changed at all */ | |
1119 | ret = memcmp(ctxt->live_map, dlm->live_nodes_map, | |
1120 | sizeof(dlm->live_nodes_map)); | |
1121 | spin_unlock(&dlm->spinlock); | |
1122 | ||
1123 | if (ret) | |
1124 | mlog(0, "Node maps changed -- should restart\n"); | |
1125 | ||
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | static int dlm_try_to_join_domain(struct dlm_ctxt *dlm) | |
1130 | { | |
1131 | int status = 0, tmpstat, node; | |
1132 | struct domain_join_ctxt *ctxt; | |
d24fbcda | 1133 | enum dlm_query_join_response_code response = JOIN_DISALLOW; |
6714d8e8 KH |
1134 | |
1135 | mlog_entry("%p", dlm); | |
1136 | ||
cd861280 | 1137 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); |
6714d8e8 KH |
1138 | if (!ctxt) { |
1139 | status = -ENOMEM; | |
1140 | mlog_errno(status); | |
1141 | goto bail; | |
1142 | } | |
1143 | ||
1144 | /* group sem locking should work for us here -- we're already | |
1145 | * registered for heartbeat events so filling this should be | |
1146 | * atomic wrt getting those handlers called. */ | |
1147 | o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map)); | |
1148 | ||
1149 | spin_lock(&dlm->spinlock); | |
1150 | memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map)); | |
1151 | ||
1152 | __dlm_set_joining_node(dlm, dlm->node_num); | |
1153 | ||
1154 | spin_unlock(&dlm->spinlock); | |
1155 | ||
1156 | node = -1; | |
1157 | while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES, | |
1158 | node + 1)) < O2NM_MAX_NODES) { | |
1159 | if (node == dlm->node_num) | |
1160 | continue; | |
1161 | ||
1162 | status = dlm_request_join(dlm, node, &response); | |
1163 | if (status < 0) { | |
1164 | mlog_errno(status); | |
1165 | goto bail; | |
1166 | } | |
1167 | ||
1168 | /* Ok, either we got a response or the node doesn't have a | |
1169 | * dlm up. */ | |
1170 | if (response == JOIN_OK) | |
1171 | set_bit(node, ctxt->yes_resp_map); | |
1172 | ||
1173 | if (dlm_should_restart_join(dlm, ctxt, response)) { | |
1174 | status = -EAGAIN; | |
1175 | goto bail; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | mlog(0, "Yay, done querying nodes!\n"); | |
1180 | ||
1181 | /* Yay, everyone agree's we can join the domain. My domain is | |
1182 | * comprised of all nodes who were put in the | |
1183 | * yes_resp_map. Copy that into our domain map and send a join | |
1184 | * assert message to clean up everyone elses state. */ | |
1185 | spin_lock(&dlm->spinlock); | |
1186 | memcpy(dlm->domain_map, ctxt->yes_resp_map, | |
1187 | sizeof(ctxt->yes_resp_map)); | |
1188 | set_bit(dlm->node_num, dlm->domain_map); | |
1189 | spin_unlock(&dlm->spinlock); | |
1190 | ||
1191 | dlm_send_join_asserts(dlm, ctxt->yes_resp_map); | |
1192 | ||
1193 | /* Joined state *must* be set before the joining node | |
1194 | * information, otherwise the query_join handler may read no | |
1195 | * current joiner but a state of NEW and tell joining nodes | |
1196 | * we're not in the domain. */ | |
1197 | spin_lock(&dlm_domain_lock); | |
1198 | dlm->dlm_state = DLM_CTXT_JOINED; | |
1199 | dlm->num_joins++; | |
1200 | spin_unlock(&dlm_domain_lock); | |
1201 | ||
1202 | bail: | |
1203 | spin_lock(&dlm->spinlock); | |
1204 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
1205 | if (!status) | |
1206 | __dlm_print_nodes(dlm); | |
1207 | spin_unlock(&dlm->spinlock); | |
1208 | ||
1209 | if (ctxt) { | |
1210 | /* Do we need to send a cancel message to any nodes? */ | |
1211 | if (status < 0) { | |
1212 | tmpstat = dlm_send_join_cancels(dlm, | |
1213 | ctxt->yes_resp_map, | |
1214 | sizeof(ctxt->yes_resp_map)); | |
1215 | if (tmpstat < 0) | |
1216 | mlog_errno(tmpstat); | |
1217 | } | |
1218 | kfree(ctxt); | |
1219 | } | |
1220 | ||
1221 | mlog(0, "returning %d\n", status); | |
1222 | return status; | |
1223 | } | |
1224 | ||
1225 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm) | |
1226 | { | |
14829422 JB |
1227 | o2hb_unregister_callback(NULL, &dlm->dlm_hb_up); |
1228 | o2hb_unregister_callback(NULL, &dlm->dlm_hb_down); | |
6714d8e8 KH |
1229 | o2net_unregister_handler_list(&dlm->dlm_domain_handlers); |
1230 | } | |
1231 | ||
1232 | static int dlm_register_domain_handlers(struct dlm_ctxt *dlm) | |
1233 | { | |
1234 | int status; | |
1235 | ||
1236 | mlog(0, "registering handlers.\n"); | |
1237 | ||
1238 | o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB, | |
1239 | dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI); | |
14829422 | 1240 | status = o2hb_register_callback(NULL, &dlm->dlm_hb_down); |
6714d8e8 KH |
1241 | if (status) |
1242 | goto bail; | |
1243 | ||
1244 | o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB, | |
1245 | dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI); | |
14829422 | 1246 | status = o2hb_register_callback(NULL, &dlm->dlm_hb_up); |
6714d8e8 KH |
1247 | if (status) |
1248 | goto bail; | |
1249 | ||
1250 | status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key, | |
1251 | sizeof(struct dlm_master_request), | |
1252 | dlm_master_request_handler, | |
d74c9803 | 1253 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1254 | if (status) |
1255 | goto bail; | |
1256 | ||
1257 | status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key, | |
1258 | sizeof(struct dlm_assert_master), | |
1259 | dlm_assert_master_handler, | |
3b8118cf KH |
1260 | dlm, dlm_assert_master_post_handler, |
1261 | &dlm->dlm_domain_handlers); | |
6714d8e8 KH |
1262 | if (status) |
1263 | goto bail; | |
1264 | ||
1265 | status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key, | |
1266 | sizeof(struct dlm_create_lock), | |
1267 | dlm_create_lock_handler, | |
d74c9803 | 1268 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1269 | if (status) |
1270 | goto bail; | |
1271 | ||
1272 | status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key, | |
1273 | DLM_CONVERT_LOCK_MAX_LEN, | |
1274 | dlm_convert_lock_handler, | |
d74c9803 | 1275 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1276 | if (status) |
1277 | goto bail; | |
1278 | ||
1279 | status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key, | |
1280 | DLM_UNLOCK_LOCK_MAX_LEN, | |
1281 | dlm_unlock_lock_handler, | |
d74c9803 | 1282 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1283 | if (status) |
1284 | goto bail; | |
1285 | ||
1286 | status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key, | |
1287 | DLM_PROXY_AST_MAX_LEN, | |
1288 | dlm_proxy_ast_handler, | |
d74c9803 | 1289 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1290 | if (status) |
1291 | goto bail; | |
1292 | ||
1293 | status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key, | |
1294 | sizeof(struct dlm_exit_domain), | |
1295 | dlm_exit_domain_handler, | |
d74c9803 | 1296 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1297 | if (status) |
1298 | goto bail; | |
1299 | ||
ba2bf218 KH |
1300 | status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key, |
1301 | sizeof(struct dlm_deref_lockres), | |
1302 | dlm_deref_lockres_handler, | |
d74c9803 | 1303 | dlm, NULL, &dlm->dlm_domain_handlers); |
ba2bf218 KH |
1304 | if (status) |
1305 | goto bail; | |
1306 | ||
6714d8e8 KH |
1307 | status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key, |
1308 | sizeof(struct dlm_migrate_request), | |
1309 | dlm_migrate_request_handler, | |
d74c9803 | 1310 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1311 | if (status) |
1312 | goto bail; | |
1313 | ||
1314 | status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key, | |
1315 | DLM_MIG_LOCKRES_MAX_LEN, | |
1316 | dlm_mig_lockres_handler, | |
d74c9803 | 1317 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1318 | if (status) |
1319 | goto bail; | |
1320 | ||
1321 | status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key, | |
1322 | sizeof(struct dlm_master_requery), | |
1323 | dlm_master_requery_handler, | |
d74c9803 | 1324 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1325 | if (status) |
1326 | goto bail; | |
1327 | ||
1328 | status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key, | |
1329 | sizeof(struct dlm_lock_request), | |
1330 | dlm_request_all_locks_handler, | |
d74c9803 | 1331 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1332 | if (status) |
1333 | goto bail; | |
1334 | ||
1335 | status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key, | |
1336 | sizeof(struct dlm_reco_data_done), | |
1337 | dlm_reco_data_done_handler, | |
d74c9803 | 1338 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1339 | if (status) |
1340 | goto bail; | |
1341 | ||
1342 | status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key, | |
1343 | sizeof(struct dlm_begin_reco), | |
1344 | dlm_begin_reco_handler, | |
d74c9803 | 1345 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1346 | if (status) |
1347 | goto bail; | |
1348 | ||
1349 | status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key, | |
1350 | sizeof(struct dlm_finalize_reco), | |
1351 | dlm_finalize_reco_handler, | |
d74c9803 | 1352 | dlm, NULL, &dlm->dlm_domain_handlers); |
6714d8e8 KH |
1353 | if (status) |
1354 | goto bail; | |
1355 | ||
1356 | bail: | |
1357 | if (status) | |
1358 | dlm_unregister_domain_handlers(dlm); | |
1359 | ||
1360 | return status; | |
1361 | } | |
1362 | ||
1363 | static int dlm_join_domain(struct dlm_ctxt *dlm) | |
1364 | { | |
1365 | int status; | |
0dd82141 SM |
1366 | unsigned int backoff; |
1367 | unsigned int total_backoff = 0; | |
6714d8e8 KH |
1368 | |
1369 | BUG_ON(!dlm); | |
1370 | ||
1371 | mlog(0, "Join domain %s\n", dlm->name); | |
1372 | ||
1373 | status = dlm_register_domain_handlers(dlm); | |
1374 | if (status) { | |
1375 | mlog_errno(status); | |
1376 | goto bail; | |
1377 | } | |
1378 | ||
1379 | status = dlm_launch_thread(dlm); | |
1380 | if (status < 0) { | |
1381 | mlog_errno(status); | |
1382 | goto bail; | |
1383 | } | |
1384 | ||
1385 | status = dlm_launch_recovery_thread(dlm); | |
1386 | if (status < 0) { | |
1387 | mlog_errno(status); | |
1388 | goto bail; | |
1389 | } | |
1390 | ||
3156d267 KH |
1391 | dlm->dlm_worker = create_singlethread_workqueue("dlm_wq"); |
1392 | if (!dlm->dlm_worker) { | |
1393 | status = -ENOMEM; | |
1394 | mlog_errno(status); | |
1395 | goto bail; | |
1396 | } | |
1397 | ||
6714d8e8 | 1398 | do { |
6714d8e8 KH |
1399 | status = dlm_try_to_join_domain(dlm); |
1400 | ||
1401 | /* If we're racing another node to the join, then we | |
1402 | * need to back off temporarily and let them | |
1403 | * complete. */ | |
0dd82141 | 1404 | #define DLM_JOIN_TIMEOUT_MSECS 90000 |
6714d8e8 KH |
1405 | if (status == -EAGAIN) { |
1406 | if (signal_pending(current)) { | |
1407 | status = -ERESTARTSYS; | |
1408 | goto bail; | |
1409 | } | |
1410 | ||
0dd82141 SM |
1411 | if (total_backoff > |
1412 | msecs_to_jiffies(DLM_JOIN_TIMEOUT_MSECS)) { | |
1413 | status = -ERESTARTSYS; | |
1414 | mlog(ML_NOTICE, "Timed out joining dlm domain " | |
1415 | "%s after %u msecs\n", dlm->name, | |
1416 | jiffies_to_msecs(total_backoff)); | |
1417 | goto bail; | |
1418 | } | |
1419 | ||
6714d8e8 KH |
1420 | /* |
1421 | * <chip> After you! | |
1422 | * <dale> No, after you! | |
1423 | * <chip> I insist! | |
1424 | * <dale> But you first! | |
1425 | * ... | |
1426 | */ | |
1427 | backoff = (unsigned int)(jiffies & 0x3); | |
1428 | backoff *= DLM_DOMAIN_BACKOFF_MS; | |
0dd82141 | 1429 | total_backoff += backoff; |
6714d8e8 KH |
1430 | mlog(0, "backoff %d\n", backoff); |
1431 | msleep(backoff); | |
1432 | } | |
1433 | } while (status == -EAGAIN); | |
1434 | ||
1435 | if (status < 0) { | |
1436 | mlog_errno(status); | |
1437 | goto bail; | |
1438 | } | |
1439 | ||
1440 | status = 0; | |
1441 | bail: | |
1442 | wake_up(&dlm_domain_events); | |
1443 | ||
1444 | if (status) { | |
1445 | dlm_unregister_domain_handlers(dlm); | |
1446 | dlm_complete_thread(dlm); | |
1447 | dlm_complete_recovery_thread(dlm); | |
3156d267 | 1448 | dlm_destroy_dlm_worker(dlm); |
6714d8e8 KH |
1449 | } |
1450 | ||
1451 | return status; | |
1452 | } | |
1453 | ||
1454 | static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain, | |
1455 | u32 key) | |
1456 | { | |
1457 | int i; | |
1458 | struct dlm_ctxt *dlm = NULL; | |
1459 | ||
cd861280 | 1460 | dlm = kzalloc(sizeof(*dlm), GFP_KERNEL); |
6714d8e8 KH |
1461 | if (!dlm) { |
1462 | mlog_errno(-ENOMEM); | |
1463 | goto leave; | |
1464 | } | |
1465 | ||
1466 | dlm->name = kmalloc(strlen(domain) + 1, GFP_KERNEL); | |
1467 | if (dlm->name == NULL) { | |
1468 | mlog_errno(-ENOMEM); | |
1469 | kfree(dlm); | |
1470 | dlm = NULL; | |
1471 | goto leave; | |
1472 | } | |
1473 | ||
03d864c0 | 1474 | dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES); |
81f2094a | 1475 | if (!dlm->lockres_hash) { |
6714d8e8 KH |
1476 | mlog_errno(-ENOMEM); |
1477 | kfree(dlm->name); | |
1478 | kfree(dlm); | |
1479 | dlm = NULL; | |
1480 | goto leave; | |
1481 | } | |
6714d8e8 | 1482 | |
03d864c0 DP |
1483 | for (i = 0; i < DLM_HASH_BUCKETS; i++) |
1484 | INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i)); | |
6714d8e8 KH |
1485 | |
1486 | strcpy(dlm->name, domain); | |
1487 | dlm->key = key; | |
1488 | dlm->node_num = o2nm_this_node(); | |
1489 | ||
1490 | spin_lock_init(&dlm->spinlock); | |
1491 | spin_lock_init(&dlm->master_lock); | |
1492 | spin_lock_init(&dlm->ast_lock); | |
1493 | INIT_LIST_HEAD(&dlm->list); | |
1494 | INIT_LIST_HEAD(&dlm->dirty_list); | |
1495 | INIT_LIST_HEAD(&dlm->reco.resources); | |
1496 | INIT_LIST_HEAD(&dlm->reco.received); | |
1497 | INIT_LIST_HEAD(&dlm->reco.node_data); | |
1498 | INIT_LIST_HEAD(&dlm->purge_list); | |
1499 | INIT_LIST_HEAD(&dlm->dlm_domain_handlers); | |
1500 | dlm->reco.state = 0; | |
1501 | ||
1502 | INIT_LIST_HEAD(&dlm->pending_asts); | |
1503 | INIT_LIST_HEAD(&dlm->pending_basts); | |
1504 | ||
1505 | mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n", | |
1506 | dlm->recovery_map, &(dlm->recovery_map[0])); | |
1507 | ||
1508 | memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map)); | |
1509 | memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map)); | |
1510 | memset(dlm->domain_map, 0, sizeof(dlm->domain_map)); | |
1511 | ||
1512 | dlm->dlm_thread_task = NULL; | |
1513 | dlm->dlm_reco_thread_task = NULL; | |
3156d267 | 1514 | dlm->dlm_worker = NULL; |
6714d8e8 KH |
1515 | init_waitqueue_head(&dlm->dlm_thread_wq); |
1516 | init_waitqueue_head(&dlm->dlm_reco_thread_wq); | |
1517 | init_waitqueue_head(&dlm->reco.event); | |
1518 | init_waitqueue_head(&dlm->ast_wq); | |
1519 | init_waitqueue_head(&dlm->migration_wq); | |
1520 | INIT_LIST_HEAD(&dlm->master_list); | |
1521 | INIT_LIST_HEAD(&dlm->mle_hb_events); | |
1522 | ||
1523 | dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN; | |
1524 | init_waitqueue_head(&dlm->dlm_join_events); | |
1525 | ||
1526 | dlm->reco.new_master = O2NM_INVALID_NODE_NUM; | |
1527 | dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; | |
1528 | atomic_set(&dlm->local_resources, 0); | |
1529 | atomic_set(&dlm->remote_resources, 0); | |
1530 | atomic_set(&dlm->unknown_resources, 0); | |
1531 | ||
1532 | spin_lock_init(&dlm->work_lock); | |
1533 | INIT_LIST_HEAD(&dlm->work_list); | |
c4028958 | 1534 | INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work); |
6714d8e8 KH |
1535 | |
1536 | kref_init(&dlm->dlm_refs); | |
1537 | dlm->dlm_state = DLM_CTXT_NEW; | |
1538 | ||
1539 | INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks); | |
1540 | ||
1541 | mlog(0, "context init: refcount %u\n", | |
1542 | atomic_read(&dlm->dlm_refs.refcount)); | |
1543 | ||
1544 | leave: | |
1545 | return dlm; | |
1546 | } | |
1547 | ||
1548 | /* | |
d24fbcda JB |
1549 | * Compare a requested locking protocol version against the current one. |
1550 | * | |
1551 | * If the major numbers are different, they are incompatible. | |
1552 | * If the current minor is greater than the request, they are incompatible. | |
1553 | * If the current minor is less than or equal to the request, they are | |
1554 | * compatible, and the requester should run at the current minor version. | |
1555 | */ | |
1556 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, | |
1557 | struct dlm_protocol_version *request) | |
1558 | { | |
1559 | if (existing->pv_major != request->pv_major) | |
1560 | return 1; | |
1561 | ||
1562 | if (existing->pv_minor > request->pv_minor) | |
1563 | return 1; | |
1564 | ||
1565 | if (existing->pv_minor < request->pv_minor) | |
1566 | request->pv_minor = existing->pv_minor; | |
1567 | ||
1568 | return 0; | |
1569 | } | |
1570 | ||
1571 | /* | |
1572 | * dlm_register_domain: one-time setup per "domain". | |
1573 | * | |
1574 | * The filesystem passes in the requested locking version via proto. | |
1575 | * If registration was successful, proto will contain the negotiated | |
1576 | * locking protocol. | |
6714d8e8 KH |
1577 | */ |
1578 | struct dlm_ctxt * dlm_register_domain(const char *domain, | |
d24fbcda JB |
1579 | u32 key, |
1580 | struct dlm_protocol_version *fs_proto) | |
6714d8e8 KH |
1581 | { |
1582 | int ret; | |
1583 | struct dlm_ctxt *dlm = NULL; | |
1584 | struct dlm_ctxt *new_ctxt = NULL; | |
1585 | ||
1586 | if (strlen(domain) > O2NM_MAX_NAME_LEN) { | |
1587 | ret = -ENAMETOOLONG; | |
1588 | mlog(ML_ERROR, "domain name length too long\n"); | |
1589 | goto leave; | |
1590 | } | |
1591 | ||
1592 | if (!o2hb_check_local_node_heartbeating()) { | |
1593 | mlog(ML_ERROR, "the local node has not been configured, or is " | |
1594 | "not heartbeating\n"); | |
1595 | ret = -EPROTO; | |
1596 | goto leave; | |
1597 | } | |
1598 | ||
1599 | mlog(0, "register called for domain \"%s\"\n", domain); | |
1600 | ||
1601 | retry: | |
1602 | dlm = NULL; | |
1603 | if (signal_pending(current)) { | |
1604 | ret = -ERESTARTSYS; | |
1605 | mlog_errno(ret); | |
1606 | goto leave; | |
1607 | } | |
1608 | ||
1609 | spin_lock(&dlm_domain_lock); | |
1610 | ||
1611 | dlm = __dlm_lookup_domain(domain); | |
1612 | if (dlm) { | |
1613 | if (dlm->dlm_state != DLM_CTXT_JOINED) { | |
1614 | spin_unlock(&dlm_domain_lock); | |
1615 | ||
1616 | mlog(0, "This ctxt is not joined yet!\n"); | |
1617 | wait_event_interruptible(dlm_domain_events, | |
1618 | dlm_wait_on_domain_helper( | |
1619 | domain)); | |
1620 | goto retry; | |
1621 | } | |
1622 | ||
d24fbcda JB |
1623 | if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) { |
1624 | mlog(ML_ERROR, | |
1625 | "Requested locking protocol version is not " | |
1626 | "compatible with already registered domain " | |
1627 | "\"%s\"\n", domain); | |
1628 | ret = -EPROTO; | |
1629 | goto leave; | |
1630 | } | |
1631 | ||
6714d8e8 KH |
1632 | __dlm_get(dlm); |
1633 | dlm->num_joins++; | |
1634 | ||
1635 | spin_unlock(&dlm_domain_lock); | |
1636 | ||
1637 | ret = 0; | |
1638 | goto leave; | |
1639 | } | |
1640 | ||
1641 | /* doesn't exist */ | |
1642 | if (!new_ctxt) { | |
1643 | spin_unlock(&dlm_domain_lock); | |
1644 | ||
1645 | new_ctxt = dlm_alloc_ctxt(domain, key); | |
1646 | if (new_ctxt) | |
1647 | goto retry; | |
1648 | ||
1649 | ret = -ENOMEM; | |
1650 | mlog_errno(ret); | |
1651 | goto leave; | |
1652 | } | |
1653 | ||
1654 | /* a little variable switch-a-roo here... */ | |
1655 | dlm = new_ctxt; | |
1656 | new_ctxt = NULL; | |
1657 | ||
1658 | /* add the new domain */ | |
1659 | list_add_tail(&dlm->list, &dlm_domains); | |
1660 | spin_unlock(&dlm_domain_lock); | |
1661 | ||
d24fbcda JB |
1662 | /* |
1663 | * Pass the locking protocol version into the join. If the join | |
1664 | * succeeds, it will have the negotiated protocol set. | |
1665 | */ | |
1666 | dlm->dlm_locking_proto = dlm_protocol; | |
1667 | dlm->fs_locking_proto = *fs_proto; | |
1668 | ||
6714d8e8 KH |
1669 | ret = dlm_join_domain(dlm); |
1670 | if (ret) { | |
1671 | mlog_errno(ret); | |
1672 | dlm_put(dlm); | |
1673 | goto leave; | |
1674 | } | |
1675 | ||
d24fbcda JB |
1676 | /* Tell the caller what locking protocol we negotiated */ |
1677 | *fs_proto = dlm->fs_locking_proto; | |
1678 | ||
6714d8e8 KH |
1679 | ret = 0; |
1680 | leave: | |
1681 | if (new_ctxt) | |
1682 | dlm_free_ctxt_mem(new_ctxt); | |
1683 | ||
1684 | if (ret < 0) | |
1685 | dlm = ERR_PTR(ret); | |
1686 | ||
1687 | return dlm; | |
1688 | } | |
1689 | EXPORT_SYMBOL_GPL(dlm_register_domain); | |
1690 | ||
1691 | static LIST_HEAD(dlm_join_handlers); | |
1692 | ||
1693 | static void dlm_unregister_net_handlers(void) | |
1694 | { | |
1695 | o2net_unregister_handler_list(&dlm_join_handlers); | |
1696 | } | |
1697 | ||
1698 | static int dlm_register_net_handlers(void) | |
1699 | { | |
1700 | int status = 0; | |
1701 | ||
1702 | status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, | |
1703 | sizeof(struct dlm_query_join_request), | |
1704 | dlm_query_join_handler, | |
d74c9803 | 1705 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
1706 | if (status) |
1707 | goto bail; | |
1708 | ||
1709 | status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, | |
1710 | sizeof(struct dlm_assert_joined), | |
1711 | dlm_assert_joined_handler, | |
d74c9803 | 1712 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
1713 | if (status) |
1714 | goto bail; | |
1715 | ||
1716 | status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, | |
1717 | sizeof(struct dlm_cancel_join), | |
1718 | dlm_cancel_join_handler, | |
d74c9803 | 1719 | NULL, NULL, &dlm_join_handlers); |
6714d8e8 KH |
1720 | |
1721 | bail: | |
1722 | if (status < 0) | |
1723 | dlm_unregister_net_handlers(); | |
1724 | ||
1725 | return status; | |
1726 | } | |
1727 | ||
1728 | /* Domain eviction callback handling. | |
1729 | * | |
1730 | * The file system requires notification of node death *before* the | |
1731 | * dlm completes it's recovery work, otherwise it may be able to | |
1732 | * acquire locks on resources requiring recovery. Since the dlm can | |
1733 | * evict a node from it's domain *before* heartbeat fires, a similar | |
1734 | * mechanism is required. */ | |
1735 | ||
1736 | /* Eviction is not expected to happen often, so a per-domain lock is | |
1737 | * not necessary. Eviction callbacks are allowed to sleep for short | |
1738 | * periods of time. */ | |
1739 | static DECLARE_RWSEM(dlm_callback_sem); | |
1740 | ||
1741 | void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm, | |
1742 | int node_num) | |
1743 | { | |
1744 | struct list_head *iter; | |
1745 | struct dlm_eviction_cb *cb; | |
1746 | ||
1747 | down_read(&dlm_callback_sem); | |
1748 | list_for_each(iter, &dlm->dlm_eviction_callbacks) { | |
1749 | cb = list_entry(iter, struct dlm_eviction_cb, ec_item); | |
1750 | ||
1751 | cb->ec_func(node_num, cb->ec_data); | |
1752 | } | |
1753 | up_read(&dlm_callback_sem); | |
1754 | } | |
1755 | ||
1756 | void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb, | |
1757 | dlm_eviction_func *f, | |
1758 | void *data) | |
1759 | { | |
1760 | INIT_LIST_HEAD(&cb->ec_item); | |
1761 | cb->ec_func = f; | |
1762 | cb->ec_data = data; | |
1763 | } | |
1764 | EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb); | |
1765 | ||
1766 | void dlm_register_eviction_cb(struct dlm_ctxt *dlm, | |
1767 | struct dlm_eviction_cb *cb) | |
1768 | { | |
1769 | down_write(&dlm_callback_sem); | |
1770 | list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks); | |
1771 | up_write(&dlm_callback_sem); | |
1772 | } | |
1773 | EXPORT_SYMBOL_GPL(dlm_register_eviction_cb); | |
1774 | ||
1775 | void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb) | |
1776 | { | |
1777 | down_write(&dlm_callback_sem); | |
1778 | list_del_init(&cb->ec_item); | |
1779 | up_write(&dlm_callback_sem); | |
1780 | } | |
1781 | EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb); | |
1782 | ||
1783 | static int __init dlm_init(void) | |
1784 | { | |
1785 | int status; | |
1786 | ||
1787 | dlm_print_version(); | |
1788 | ||
1789 | status = dlm_init_mle_cache(); | |
1790 | if (status) | |
1791 | return -1; | |
1792 | ||
1793 | status = dlm_register_net_handlers(); | |
1794 | if (status) { | |
1795 | dlm_destroy_mle_cache(); | |
1796 | return -1; | |
1797 | } | |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | static void __exit dlm_exit (void) | |
1803 | { | |
1804 | dlm_unregister_net_handlers(); | |
1805 | dlm_destroy_mle_cache(); | |
1806 | } | |
1807 | ||
1808 | MODULE_AUTHOR("Oracle"); | |
1809 | MODULE_LICENSE("GPL"); | |
1810 | ||
1811 | module_init(dlm_init); | |
1812 | module_exit(dlm_exit); |