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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * dlmrecovery.c | |
5 | * | |
6 | * recovery stuff | |
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 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/highmem.h> | |
33 | #include <linux/utsname.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/sysctl.h> | |
36 | #include <linux/random.h> | |
37 | #include <linux/blkdev.h> | |
38 | #include <linux/socket.h> | |
39 | #include <linux/inet.h> | |
40 | #include <linux/timer.h> | |
41 | #include <linux/kthread.h> | |
b4c7f538 | 42 | #include <linux/delay.h> |
6714d8e8 KH |
43 | |
44 | ||
45 | #include "cluster/heartbeat.h" | |
46 | #include "cluster/nodemanager.h" | |
47 | #include "cluster/tcp.h" | |
48 | ||
49 | #include "dlmapi.h" | |
50 | #include "dlmcommon.h" | |
51 | #include "dlmdomain.h" | |
52 | ||
53 | #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_RECOVERY) | |
54 | #include "cluster/masklog.h" | |
55 | ||
56 | static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node); | |
57 | ||
58 | static int dlm_recovery_thread(void *data); | |
59 | void dlm_complete_recovery_thread(struct dlm_ctxt *dlm); | |
60 | int dlm_launch_recovery_thread(struct dlm_ctxt *dlm); | |
61 | static void dlm_kick_recovery_thread(struct dlm_ctxt *dlm); | |
62 | static int dlm_do_recovery(struct dlm_ctxt *dlm); | |
63 | ||
64 | static int dlm_pick_recovery_master(struct dlm_ctxt *dlm); | |
65 | static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node); | |
66 | static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node); | |
67 | static int dlm_request_all_locks(struct dlm_ctxt *dlm, | |
68 | u8 request_from, u8 dead_node); | |
69 | static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node); | |
70 | ||
71 | static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res); | |
72 | static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres, | |
73 | const char *lockname, int namelen, | |
74 | int total_locks, u64 cookie, | |
75 | u8 flags, u8 master); | |
76 | static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm, | |
77 | struct dlm_migratable_lockres *mres, | |
78 | u8 send_to, | |
79 | struct dlm_lock_resource *res, | |
80 | int total_locks); | |
81 | static int dlm_lockres_master_requery(struct dlm_ctxt *dlm, | |
82 | struct dlm_lock_resource *res, | |
83 | u8 *real_master); | |
84 | static int dlm_process_recovery_data(struct dlm_ctxt *dlm, | |
85 | struct dlm_lock_resource *res, | |
86 | struct dlm_migratable_lockres *mres); | |
87 | static int dlm_do_master_requery(struct dlm_ctxt *dlm, | |
88 | struct dlm_lock_resource *res, | |
89 | u8 nodenum, u8 *real_master); | |
90 | static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm); | |
91 | static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, | |
92 | u8 dead_node, u8 send_to); | |
93 | static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node); | |
94 | static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm, | |
95 | struct list_head *list, u8 dead_node); | |
96 | static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm, | |
97 | u8 dead_node, u8 new_master); | |
98 | static void dlm_reco_ast(void *astdata); | |
99 | static void dlm_reco_bast(void *astdata, int blocked_type); | |
100 | static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st); | |
101 | static void dlm_request_all_locks_worker(struct dlm_work_item *item, | |
102 | void *data); | |
103 | static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data); | |
104 | ||
105 | static u64 dlm_get_next_mig_cookie(void); | |
106 | ||
107 | static spinlock_t dlm_reco_state_lock = SPIN_LOCK_UNLOCKED; | |
108 | static spinlock_t dlm_mig_cookie_lock = SPIN_LOCK_UNLOCKED; | |
109 | static u64 dlm_mig_cookie = 1; | |
110 | ||
111 | static u64 dlm_get_next_mig_cookie(void) | |
112 | { | |
113 | u64 c; | |
114 | spin_lock(&dlm_mig_cookie_lock); | |
115 | c = dlm_mig_cookie; | |
116 | if (dlm_mig_cookie == (~0ULL)) | |
117 | dlm_mig_cookie = 1; | |
118 | else | |
119 | dlm_mig_cookie++; | |
120 | spin_unlock(&dlm_mig_cookie_lock); | |
121 | return c; | |
122 | } | |
123 | ||
124 | static inline void dlm_reset_recovery(struct dlm_ctxt *dlm) | |
125 | { | |
126 | spin_lock(&dlm->spinlock); | |
127 | clear_bit(dlm->reco.dead_node, dlm->recovery_map); | |
128 | dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; | |
129 | dlm->reco.new_master = O2NM_INVALID_NODE_NUM; | |
130 | spin_unlock(&dlm->spinlock); | |
131 | } | |
132 | ||
133 | /* Worker function used during recovery. */ | |
134 | void dlm_dispatch_work(void *data) | |
135 | { | |
136 | struct dlm_ctxt *dlm = (struct dlm_ctxt *)data; | |
137 | LIST_HEAD(tmp_list); | |
138 | struct list_head *iter, *iter2; | |
139 | struct dlm_work_item *item; | |
140 | dlm_workfunc_t *workfunc; | |
141 | ||
142 | spin_lock(&dlm->work_lock); | |
143 | list_splice_init(&dlm->work_list, &tmp_list); | |
144 | spin_unlock(&dlm->work_lock); | |
145 | ||
146 | list_for_each_safe(iter, iter2, &tmp_list) { | |
147 | item = list_entry(iter, struct dlm_work_item, list); | |
148 | workfunc = item->func; | |
149 | list_del_init(&item->list); | |
150 | ||
151 | /* already have ref on dlm to avoid having | |
152 | * it disappear. just double-check. */ | |
153 | BUG_ON(item->dlm != dlm); | |
154 | ||
155 | /* this is allowed to sleep and | |
156 | * call network stuff */ | |
157 | workfunc(item, item->data); | |
158 | ||
159 | dlm_put(dlm); | |
160 | kfree(item); | |
161 | } | |
162 | } | |
163 | ||
164 | /* | |
165 | * RECOVERY THREAD | |
166 | */ | |
167 | ||
168 | static void dlm_kick_recovery_thread(struct dlm_ctxt *dlm) | |
169 | { | |
170 | /* wake the recovery thread | |
171 | * this will wake the reco thread in one of three places | |
172 | * 1) sleeping with no recovery happening | |
173 | * 2) sleeping with recovery mastered elsewhere | |
174 | * 3) recovery mastered here, waiting on reco data */ | |
175 | ||
176 | wake_up(&dlm->dlm_reco_thread_wq); | |
177 | } | |
178 | ||
179 | /* Launch the recovery thread */ | |
180 | int dlm_launch_recovery_thread(struct dlm_ctxt *dlm) | |
181 | { | |
182 | mlog(0, "starting dlm recovery thread...\n"); | |
183 | ||
184 | dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm, | |
185 | "dlm_reco_thread"); | |
186 | if (IS_ERR(dlm->dlm_reco_thread_task)) { | |
187 | mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task)); | |
188 | dlm->dlm_reco_thread_task = NULL; | |
189 | return -EINVAL; | |
190 | } | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | void dlm_complete_recovery_thread(struct dlm_ctxt *dlm) | |
196 | { | |
197 | if (dlm->dlm_reco_thread_task) { | |
198 | mlog(0, "waiting for dlm recovery thread to exit\n"); | |
199 | kthread_stop(dlm->dlm_reco_thread_task); | |
200 | dlm->dlm_reco_thread_task = NULL; | |
201 | } | |
202 | } | |
203 | ||
204 | ||
205 | ||
206 | /* | |
207 | * this is lame, but here's how recovery works... | |
208 | * 1) all recovery threads cluster wide will work on recovering | |
209 | * ONE node at a time | |
210 | * 2) negotiate who will take over all the locks for the dead node. | |
211 | * thats right... ALL the locks. | |
212 | * 3) once a new master is chosen, everyone scans all locks | |
213 | * and moves aside those mastered by the dead guy | |
214 | * 4) each of these locks should be locked until recovery is done | |
215 | * 5) the new master collects up all of secondary lock queue info | |
216 | * one lock at a time, forcing each node to communicate back | |
217 | * before continuing | |
218 | * 6) each secondary lock queue responds with the full known lock info | |
219 | * 7) once the new master has run all its locks, it sends a ALLDONE! | |
220 | * message to everyone | |
221 | * 8) upon receiving this message, the secondary queue node unlocks | |
222 | * and responds to the ALLDONE | |
223 | * 9) once the new master gets responses from everyone, he unlocks | |
224 | * everything and recovery for this dead node is done | |
225 | *10) go back to 2) while there are still dead nodes | |
226 | * | |
227 | */ | |
228 | ||
229 | ||
230 | #define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000) | |
231 | ||
232 | static int dlm_recovery_thread(void *data) | |
233 | { | |
234 | int status; | |
235 | struct dlm_ctxt *dlm = data; | |
236 | unsigned long timeout = msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS); | |
237 | ||
238 | mlog(0, "dlm thread running for %s...\n", dlm->name); | |
239 | ||
240 | while (!kthread_should_stop()) { | |
241 | if (dlm_joined(dlm)) { | |
242 | status = dlm_do_recovery(dlm); | |
243 | if (status == -EAGAIN) { | |
244 | /* do not sleep, recheck immediately. */ | |
245 | continue; | |
246 | } | |
247 | if (status < 0) | |
248 | mlog_errno(status); | |
249 | } | |
250 | ||
251 | wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq, | |
252 | kthread_should_stop(), | |
253 | timeout); | |
254 | } | |
255 | ||
256 | mlog(0, "quitting DLM recovery thread\n"); | |
257 | return 0; | |
258 | } | |
259 | ||
e2faea4c KH |
260 | /* returns true when the recovery master has contacted us */ |
261 | static int dlm_reco_master_ready(struct dlm_ctxt *dlm) | |
262 | { | |
263 | int ready; | |
264 | spin_lock(&dlm->spinlock); | |
265 | ready = (dlm->reco.new_master != O2NM_INVALID_NODE_NUM); | |
266 | spin_unlock(&dlm->spinlock); | |
267 | return ready; | |
268 | } | |
269 | ||
270 | /* returns true if node is no longer in the domain | |
271 | * could be dead or just not joined */ | |
272 | int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node) | |
273 | { | |
274 | int dead; | |
275 | spin_lock(&dlm->spinlock); | |
276 | dead = test_bit(node, dlm->domain_map); | |
277 | spin_unlock(&dlm->spinlock); | |
278 | return dead; | |
279 | } | |
280 | ||
44465a7d KH |
281 | int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout) |
282 | { | |
283 | if (timeout) { | |
284 | mlog(ML_NOTICE, "%s: waiting %dms for notification of " | |
285 | "death of node %u\n", dlm->name, timeout, node); | |
286 | wait_event_timeout(dlm->dlm_reco_thread_wq, | |
287 | dlm_is_node_dead(dlm, node), | |
288 | msecs_to_jiffies(timeout)); | |
289 | } else { | |
290 | mlog(ML_NOTICE, "%s: waiting indefinitely for notification " | |
291 | "of death of node %u\n", dlm->name, node); | |
292 | wait_event(dlm->dlm_reco_thread_wq, | |
293 | dlm_is_node_dead(dlm, node)); | |
294 | } | |
295 | /* for now, return 0 */ | |
296 | return 0; | |
297 | } | |
298 | ||
6714d8e8 KH |
299 | /* callers of the top-level api calls (dlmlock/dlmunlock) should |
300 | * block on the dlm->reco.event when recovery is in progress. | |
301 | * the dlm recovery thread will set this state when it begins | |
302 | * recovering a dead node (as the new master or not) and clear | |
303 | * the state and wake as soon as all affected lock resources have | |
304 | * been marked with the RECOVERY flag */ | |
305 | static int dlm_in_recovery(struct dlm_ctxt *dlm) | |
306 | { | |
307 | int in_recovery; | |
308 | spin_lock(&dlm->spinlock); | |
309 | in_recovery = !!(dlm->reco.state & DLM_RECO_STATE_ACTIVE); | |
310 | spin_unlock(&dlm->spinlock); | |
311 | return in_recovery; | |
312 | } | |
313 | ||
314 | ||
315 | void dlm_wait_for_recovery(struct dlm_ctxt *dlm) | |
316 | { | |
317 | wait_event(dlm->reco.event, !dlm_in_recovery(dlm)); | |
318 | } | |
319 | ||
320 | static void dlm_begin_recovery(struct dlm_ctxt *dlm) | |
321 | { | |
322 | spin_lock(&dlm->spinlock); | |
323 | BUG_ON(dlm->reco.state & DLM_RECO_STATE_ACTIVE); | |
324 | dlm->reco.state |= DLM_RECO_STATE_ACTIVE; | |
325 | spin_unlock(&dlm->spinlock); | |
326 | } | |
327 | ||
328 | static void dlm_end_recovery(struct dlm_ctxt *dlm) | |
329 | { | |
330 | spin_lock(&dlm->spinlock); | |
331 | BUG_ON(!(dlm->reco.state & DLM_RECO_STATE_ACTIVE)); | |
332 | dlm->reco.state &= ~DLM_RECO_STATE_ACTIVE; | |
333 | spin_unlock(&dlm->spinlock); | |
334 | wake_up(&dlm->reco.event); | |
335 | } | |
336 | ||
337 | static int dlm_do_recovery(struct dlm_ctxt *dlm) | |
338 | { | |
339 | int status = 0; | |
e2faea4c | 340 | int ret; |
6714d8e8 KH |
341 | |
342 | spin_lock(&dlm->spinlock); | |
343 | ||
344 | /* check to see if the new master has died */ | |
345 | if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM && | |
346 | test_bit(dlm->reco.new_master, dlm->recovery_map)) { | |
347 | mlog(0, "new master %u died while recovering %u!\n", | |
348 | dlm->reco.new_master, dlm->reco.dead_node); | |
349 | /* unset the new_master, leave dead_node */ | |
350 | dlm->reco.new_master = O2NM_INVALID_NODE_NUM; | |
351 | } | |
352 | ||
353 | /* select a target to recover */ | |
354 | if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) { | |
355 | int bit; | |
356 | ||
357 | bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES+1, 0); | |
358 | if (bit >= O2NM_MAX_NODES || bit < 0) | |
359 | dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; | |
360 | else | |
361 | dlm->reco.dead_node = bit; | |
362 | } else if (!test_bit(dlm->reco.dead_node, dlm->recovery_map)) { | |
363 | /* BUG? */ | |
364 | mlog(ML_ERROR, "dead_node %u no longer in recovery map!\n", | |
365 | dlm->reco.dead_node); | |
366 | dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; | |
367 | } | |
368 | ||
369 | if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) { | |
370 | // mlog(0, "nothing to recover! sleeping now!\n"); | |
371 | spin_unlock(&dlm->spinlock); | |
372 | /* return to main thread loop and sleep. */ | |
373 | return 0; | |
374 | } | |
375 | mlog(0, "recovery thread found node %u in the recovery map!\n", | |
376 | dlm->reco.dead_node); | |
377 | spin_unlock(&dlm->spinlock); | |
378 | ||
379 | /* take write barrier */ | |
380 | /* (stops the list reshuffling thread, proxy ast handling) */ | |
381 | dlm_begin_recovery(dlm); | |
382 | ||
383 | if (dlm->reco.new_master == dlm->node_num) | |
384 | goto master_here; | |
385 | ||
386 | if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) { | |
e2faea4c KH |
387 | /* choose a new master, returns 0 if this node |
388 | * is the master, -EEXIST if it's another node. | |
389 | * this does not return until a new master is chosen | |
390 | * or recovery completes entirely. */ | |
391 | ret = dlm_pick_recovery_master(dlm); | |
392 | if (!ret) { | |
6714d8e8 | 393 | /* already notified everyone. go. */ |
6714d8e8 KH |
394 | goto master_here; |
395 | } | |
396 | mlog(0, "another node will master this recovery session.\n"); | |
397 | } | |
398 | mlog(0, "dlm=%s, new_master=%u, this node=%u, dead_node=%u\n", | |
399 | dlm->name, dlm->reco.new_master, | |
400 | dlm->node_num, dlm->reco.dead_node); | |
401 | ||
402 | /* it is safe to start everything back up here | |
403 | * because all of the dead node's lock resources | |
404 | * have been marked as in-recovery */ | |
405 | dlm_end_recovery(dlm); | |
406 | ||
407 | /* sleep out in main dlm_recovery_thread loop. */ | |
408 | return 0; | |
409 | ||
410 | master_here: | |
411 | mlog(0, "mastering recovery of %s:%u here(this=%u)!\n", | |
412 | dlm->name, dlm->reco.dead_node, dlm->node_num); | |
413 | ||
414 | status = dlm_remaster_locks(dlm, dlm->reco.dead_node); | |
415 | if (status < 0) { | |
416 | mlog(ML_ERROR, "error %d remastering locks for node %u, " | |
417 | "retrying.\n", status, dlm->reco.dead_node); | |
e2faea4c KH |
418 | /* yield a bit to allow any final network messages |
419 | * to get handled on remaining nodes */ | |
420 | msleep(100); | |
6714d8e8 KH |
421 | } else { |
422 | /* success! see if any other nodes need recovery */ | |
e2faea4c KH |
423 | mlog(0, "DONE mastering recovery of %s:%u here(this=%u)!\n", |
424 | dlm->name, dlm->reco.dead_node, dlm->node_num); | |
6714d8e8 KH |
425 | dlm_reset_recovery(dlm); |
426 | } | |
427 | dlm_end_recovery(dlm); | |
428 | ||
429 | /* continue and look for another dead node */ | |
430 | return -EAGAIN; | |
431 | } | |
432 | ||
433 | static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node) | |
434 | { | |
435 | int status = 0; | |
436 | struct dlm_reco_node_data *ndata; | |
437 | struct list_head *iter; | |
438 | int all_nodes_done; | |
439 | int destroy = 0; | |
440 | int pass = 0; | |
441 | ||
442 | status = dlm_init_recovery_area(dlm, dead_node); | |
443 | if (status < 0) | |
444 | goto leave; | |
445 | ||
446 | /* safe to access the node data list without a lock, since this | |
447 | * process is the only one to change the list */ | |
448 | list_for_each(iter, &dlm->reco.node_data) { | |
449 | ndata = list_entry (iter, struct dlm_reco_node_data, list); | |
450 | BUG_ON(ndata->state != DLM_RECO_NODE_DATA_INIT); | |
451 | ndata->state = DLM_RECO_NODE_DATA_REQUESTING; | |
452 | ||
453 | mlog(0, "requesting lock info from node %u\n", | |
454 | ndata->node_num); | |
455 | ||
456 | if (ndata->node_num == dlm->node_num) { | |
457 | ndata->state = DLM_RECO_NODE_DATA_DONE; | |
458 | continue; | |
459 | } | |
460 | ||
461 | status = dlm_request_all_locks(dlm, ndata->node_num, dead_node); | |
462 | if (status < 0) { | |
463 | mlog_errno(status); | |
464 | if (dlm_is_host_down(status)) | |
465 | ndata->state = DLM_RECO_NODE_DATA_DEAD; | |
466 | else { | |
467 | destroy = 1; | |
468 | goto leave; | |
469 | } | |
470 | } | |
471 | ||
472 | switch (ndata->state) { | |
473 | case DLM_RECO_NODE_DATA_INIT: | |
474 | case DLM_RECO_NODE_DATA_FINALIZE_SENT: | |
475 | case DLM_RECO_NODE_DATA_REQUESTED: | |
476 | BUG(); | |
477 | break; | |
478 | case DLM_RECO_NODE_DATA_DEAD: | |
479 | mlog(0, "node %u died after requesting " | |
480 | "recovery info for node %u\n", | |
481 | ndata->node_num, dead_node); | |
482 | // start all over | |
483 | destroy = 1; | |
484 | status = -EAGAIN; | |
485 | goto leave; | |
486 | case DLM_RECO_NODE_DATA_REQUESTING: | |
487 | ndata->state = DLM_RECO_NODE_DATA_REQUESTED; | |
488 | mlog(0, "now receiving recovery data from " | |
489 | "node %u for dead node %u\n", | |
490 | ndata->node_num, dead_node); | |
491 | break; | |
492 | case DLM_RECO_NODE_DATA_RECEIVING: | |
493 | mlog(0, "already receiving recovery data from " | |
494 | "node %u for dead node %u\n", | |
495 | ndata->node_num, dead_node); | |
496 | break; | |
497 | case DLM_RECO_NODE_DATA_DONE: | |
498 | mlog(0, "already DONE receiving recovery data " | |
499 | "from node %u for dead node %u\n", | |
500 | ndata->node_num, dead_node); | |
501 | break; | |
502 | } | |
503 | } | |
504 | ||
505 | mlog(0, "done requesting all lock info\n"); | |
506 | ||
507 | /* nodes should be sending reco data now | |
508 | * just need to wait */ | |
509 | ||
510 | while (1) { | |
511 | /* check all the nodes now to see if we are | |
512 | * done, or if anyone died */ | |
513 | all_nodes_done = 1; | |
514 | spin_lock(&dlm_reco_state_lock); | |
515 | list_for_each(iter, &dlm->reco.node_data) { | |
516 | ndata = list_entry (iter, struct dlm_reco_node_data, list); | |
517 | ||
518 | mlog(0, "checking recovery state of node %u\n", | |
519 | ndata->node_num); | |
520 | switch (ndata->state) { | |
521 | case DLM_RECO_NODE_DATA_INIT: | |
522 | case DLM_RECO_NODE_DATA_REQUESTING: | |
523 | mlog(ML_ERROR, "bad ndata state for " | |
524 | "node %u: state=%d\n", | |
525 | ndata->node_num, ndata->state); | |
526 | BUG(); | |
527 | break; | |
528 | case DLM_RECO_NODE_DATA_DEAD: | |
e2faea4c | 529 | mlog(ML_NOTICE, "node %u died after " |
6714d8e8 KH |
530 | "requesting recovery info for " |
531 | "node %u\n", ndata->node_num, | |
532 | dead_node); | |
533 | spin_unlock(&dlm_reco_state_lock); | |
534 | // start all over | |
535 | destroy = 1; | |
536 | status = -EAGAIN; | |
e2faea4c KH |
537 | /* instead of spinning like crazy here, |
538 | * wait for the domain map to catch up | |
539 | * with the network state. otherwise this | |
540 | * can be hit hundreds of times before | |
541 | * the node is really seen as dead. */ | |
542 | wait_event_timeout(dlm->dlm_reco_thread_wq, | |
543 | dlm_is_node_dead(dlm, | |
544 | ndata->node_num), | |
545 | msecs_to_jiffies(1000)); | |
546 | mlog(0, "waited 1 sec for %u, " | |
547 | "dead? %s\n", ndata->node_num, | |
548 | dlm_is_node_dead(dlm, ndata->node_num) ? | |
549 | "yes" : "no"); | |
6714d8e8 KH |
550 | goto leave; |
551 | case DLM_RECO_NODE_DATA_RECEIVING: | |
552 | case DLM_RECO_NODE_DATA_REQUESTED: | |
553 | all_nodes_done = 0; | |
554 | break; | |
555 | case DLM_RECO_NODE_DATA_DONE: | |
556 | break; | |
557 | case DLM_RECO_NODE_DATA_FINALIZE_SENT: | |
558 | break; | |
559 | } | |
560 | } | |
561 | spin_unlock(&dlm_reco_state_lock); | |
562 | ||
563 | mlog(0, "pass #%d, all_nodes_done?: %s\n", ++pass, | |
564 | all_nodes_done?"yes":"no"); | |
565 | if (all_nodes_done) { | |
566 | int ret; | |
567 | ||
568 | /* all nodes are now in DLM_RECO_NODE_DATA_DONE state | |
569 | * just send a finalize message to everyone and | |
570 | * clean up */ | |
571 | mlog(0, "all nodes are done! send finalize\n"); | |
572 | ret = dlm_send_finalize_reco_message(dlm); | |
573 | if (ret < 0) | |
574 | mlog_errno(ret); | |
575 | ||
576 | spin_lock(&dlm->spinlock); | |
577 | dlm_finish_local_lockres_recovery(dlm, dead_node, | |
578 | dlm->node_num); | |
579 | spin_unlock(&dlm->spinlock); | |
580 | mlog(0, "should be done with recovery!\n"); | |
581 | ||
582 | mlog(0, "finishing recovery of %s at %lu, " | |
583 | "dead=%u, this=%u, new=%u\n", dlm->name, | |
584 | jiffies, dlm->reco.dead_node, | |
585 | dlm->node_num, dlm->reco.new_master); | |
586 | destroy = 1; | |
587 | status = ret; | |
588 | /* rescan everything marked dirty along the way */ | |
589 | dlm_kick_thread(dlm, NULL); | |
590 | break; | |
591 | } | |
592 | /* wait to be signalled, with periodic timeout | |
593 | * to check for node death */ | |
594 | wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq, | |
595 | kthread_should_stop(), | |
596 | msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS)); | |
597 | ||
598 | } | |
599 | ||
600 | leave: | |
601 | if (destroy) | |
602 | dlm_destroy_recovery_area(dlm, dead_node); | |
603 | ||
604 | mlog_exit(status); | |
605 | return status; | |
606 | } | |
607 | ||
608 | static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node) | |
609 | { | |
610 | int num=0; | |
611 | struct dlm_reco_node_data *ndata; | |
612 | ||
613 | spin_lock(&dlm->spinlock); | |
614 | memcpy(dlm->reco.node_map, dlm->domain_map, sizeof(dlm->domain_map)); | |
615 | /* nodes can only be removed (by dying) after dropping | |
616 | * this lock, and death will be trapped later, so this should do */ | |
617 | spin_unlock(&dlm->spinlock); | |
618 | ||
619 | while (1) { | |
620 | num = find_next_bit (dlm->reco.node_map, O2NM_MAX_NODES, num); | |
621 | if (num >= O2NM_MAX_NODES) { | |
622 | break; | |
623 | } | |
624 | BUG_ON(num == dead_node); | |
625 | ||
626 | ndata = kcalloc(1, sizeof(*ndata), GFP_KERNEL); | |
627 | if (!ndata) { | |
628 | dlm_destroy_recovery_area(dlm, dead_node); | |
629 | return -ENOMEM; | |
630 | } | |
631 | ndata->node_num = num; | |
632 | ndata->state = DLM_RECO_NODE_DATA_INIT; | |
633 | spin_lock(&dlm_reco_state_lock); | |
634 | list_add_tail(&ndata->list, &dlm->reco.node_data); | |
635 | spin_unlock(&dlm_reco_state_lock); | |
636 | num++; | |
637 | } | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node) | |
643 | { | |
644 | struct list_head *iter, *iter2; | |
645 | struct dlm_reco_node_data *ndata; | |
646 | LIST_HEAD(tmplist); | |
647 | ||
648 | spin_lock(&dlm_reco_state_lock); | |
649 | list_splice_init(&dlm->reco.node_data, &tmplist); | |
650 | spin_unlock(&dlm_reco_state_lock); | |
651 | ||
652 | list_for_each_safe(iter, iter2, &tmplist) { | |
653 | ndata = list_entry (iter, struct dlm_reco_node_data, list); | |
654 | list_del_init(&ndata->list); | |
655 | kfree(ndata); | |
656 | } | |
657 | } | |
658 | ||
659 | static int dlm_request_all_locks(struct dlm_ctxt *dlm, u8 request_from, | |
660 | u8 dead_node) | |
661 | { | |
662 | struct dlm_lock_request lr; | |
663 | enum dlm_status ret; | |
664 | ||
665 | mlog(0, "\n"); | |
666 | ||
667 | ||
668 | mlog(0, "dlm_request_all_locks: dead node is %u, sending request " | |
669 | "to %u\n", dead_node, request_from); | |
670 | ||
671 | memset(&lr, 0, sizeof(lr)); | |
672 | lr.node_idx = dlm->node_num; | |
673 | lr.dead_node = dead_node; | |
674 | ||
675 | // send message | |
676 | ret = DLM_NOLOCKMGR; | |
677 | ret = o2net_send_message(DLM_LOCK_REQUEST_MSG, dlm->key, | |
678 | &lr, sizeof(lr), request_from, NULL); | |
679 | ||
680 | /* negative status is handled by caller */ | |
681 | if (ret < 0) | |
682 | mlog_errno(ret); | |
683 | ||
684 | // return from here, then | |
685 | // sleep until all received or error | |
686 | return ret; | |
687 | ||
688 | } | |
689 | ||
690 | int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data) | |
691 | { | |
692 | struct dlm_ctxt *dlm = data; | |
693 | struct dlm_lock_request *lr = (struct dlm_lock_request *)msg->buf; | |
694 | char *buf = NULL; | |
695 | struct dlm_work_item *item = NULL; | |
696 | ||
697 | if (!dlm_grab(dlm)) | |
698 | return -EINVAL; | |
699 | ||
700 | BUG_ON(lr->dead_node != dlm->reco.dead_node); | |
701 | ||
702 | item = kcalloc(1, sizeof(*item), GFP_KERNEL); | |
703 | if (!item) { | |
704 | dlm_put(dlm); | |
705 | return -ENOMEM; | |
706 | } | |
707 | ||
708 | /* this will get freed by dlm_request_all_locks_worker */ | |
709 | buf = (char *) __get_free_page(GFP_KERNEL); | |
710 | if (!buf) { | |
711 | kfree(item); | |
712 | dlm_put(dlm); | |
713 | return -ENOMEM; | |
714 | } | |
715 | ||
716 | /* queue up work for dlm_request_all_locks_worker */ | |
717 | dlm_grab(dlm); /* get an extra ref for the work item */ | |
718 | dlm_init_work_item(dlm, item, dlm_request_all_locks_worker, buf); | |
719 | item->u.ral.reco_master = lr->node_idx; | |
720 | item->u.ral.dead_node = lr->dead_node; | |
721 | spin_lock(&dlm->work_lock); | |
722 | list_add_tail(&item->list, &dlm->work_list); | |
723 | spin_unlock(&dlm->work_lock); | |
724 | schedule_work(&dlm->dispatched_work); | |
725 | ||
726 | dlm_put(dlm); | |
727 | return 0; | |
728 | } | |
729 | ||
730 | static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data) | |
731 | { | |
732 | struct dlm_migratable_lockres *mres; | |
733 | struct dlm_lock_resource *res; | |
734 | struct dlm_ctxt *dlm; | |
735 | LIST_HEAD(resources); | |
736 | struct list_head *iter; | |
737 | int ret; | |
738 | u8 dead_node, reco_master; | |
739 | ||
740 | dlm = item->dlm; | |
741 | dead_node = item->u.ral.dead_node; | |
742 | reco_master = item->u.ral.reco_master; | |
e2faea4c KH |
743 | mres = (struct dlm_migratable_lockres *)data; |
744 | ||
745 | if (dead_node != dlm->reco.dead_node || | |
746 | reco_master != dlm->reco.new_master) { | |
747 | /* show extra debug info if the recovery state is messed */ | |
748 | mlog(ML_ERROR, "%s: bad reco state: reco(dead=%u, master=%u), " | |
749 | "request(dead=%u, master=%u)\n", | |
750 | dlm->name, dlm->reco.dead_node, dlm->reco.new_master, | |
751 | dead_node, reco_master); | |
752 | mlog(ML_ERROR, "%s: name=%.*s master=%u locks=%u/%u flags=%u " | |
753 | "entry[0]={c=%"MLFu64",l=%u,f=%u,t=%d,ct=%d,hb=%d,n=%u}\n", | |
754 | dlm->name, mres->lockname_len, mres->lockname, mres->master, | |
755 | mres->num_locks, mres->total_locks, mres->flags, | |
756 | mres->ml[0].cookie, mres->ml[0].list, mres->ml[0].flags, | |
757 | mres->ml[0].type, mres->ml[0].convert_type, | |
758 | mres->ml[0].highest_blocked, mres->ml[0].node); | |
759 | BUG(); | |
760 | } | |
6714d8e8 KH |
761 | BUG_ON(dead_node != dlm->reco.dead_node); |
762 | BUG_ON(reco_master != dlm->reco.new_master); | |
763 | ||
6714d8e8 KH |
764 | /* lock resources should have already been moved to the |
765 | * dlm->reco.resources list. now move items from that list | |
766 | * to a temp list if the dead owner matches. note that the | |
767 | * whole cluster recovers only one node at a time, so we | |
768 | * can safely move UNKNOWN lock resources for each recovery | |
769 | * session. */ | |
770 | dlm_move_reco_locks_to_list(dlm, &resources, dead_node); | |
771 | ||
772 | /* now we can begin blasting lockreses without the dlm lock */ | |
773 | list_for_each(iter, &resources) { | |
774 | res = list_entry (iter, struct dlm_lock_resource, recovering); | |
775 | ret = dlm_send_one_lockres(dlm, res, mres, reco_master, | |
776 | DLM_MRES_RECOVERY); | |
777 | if (ret < 0) | |
778 | mlog_errno(ret); | |
779 | } | |
780 | ||
781 | /* move the resources back to the list */ | |
782 | spin_lock(&dlm->spinlock); | |
783 | list_splice_init(&resources, &dlm->reco.resources); | |
784 | spin_unlock(&dlm->spinlock); | |
785 | ||
786 | ret = dlm_send_all_done_msg(dlm, dead_node, reco_master); | |
787 | if (ret < 0) | |
788 | mlog_errno(ret); | |
789 | ||
790 | free_page((unsigned long)data); | |
791 | } | |
792 | ||
793 | ||
794 | static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, u8 dead_node, u8 send_to) | |
795 | { | |
796 | int ret, tmpret; | |
797 | struct dlm_reco_data_done done_msg; | |
798 | ||
799 | memset(&done_msg, 0, sizeof(done_msg)); | |
800 | done_msg.node_idx = dlm->node_num; | |
801 | done_msg.dead_node = dead_node; | |
802 | mlog(0, "sending DATA DONE message to %u, " | |
803 | "my node=%u, dead node=%u\n", send_to, done_msg.node_idx, | |
804 | done_msg.dead_node); | |
805 | ||
806 | ret = o2net_send_message(DLM_RECO_DATA_DONE_MSG, dlm->key, &done_msg, | |
807 | sizeof(done_msg), send_to, &tmpret); | |
808 | /* negative status is ignored by the caller */ | |
809 | if (ret >= 0) | |
810 | ret = tmpret; | |
811 | return ret; | |
812 | } | |
813 | ||
814 | ||
815 | int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data) | |
816 | { | |
817 | struct dlm_ctxt *dlm = data; | |
818 | struct dlm_reco_data_done *done = (struct dlm_reco_data_done *)msg->buf; | |
819 | struct list_head *iter; | |
820 | struct dlm_reco_node_data *ndata = NULL; | |
821 | int ret = -EINVAL; | |
822 | ||
823 | if (!dlm_grab(dlm)) | |
824 | return -EINVAL; | |
825 | ||
826 | mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, " | |
827 | "node_idx=%u, this node=%u\n", done->dead_node, | |
828 | dlm->reco.dead_node, done->node_idx, dlm->node_num); | |
829 | BUG_ON(done->dead_node != dlm->reco.dead_node); | |
830 | ||
831 | spin_lock(&dlm_reco_state_lock); | |
832 | list_for_each(iter, &dlm->reco.node_data) { | |
833 | ndata = list_entry (iter, struct dlm_reco_node_data, list); | |
834 | if (ndata->node_num != done->node_idx) | |
835 | continue; | |
836 | ||
837 | switch (ndata->state) { | |
e2faea4c | 838 | /* should have moved beyond INIT but not to FINALIZE yet */ |
6714d8e8 KH |
839 | case DLM_RECO_NODE_DATA_INIT: |
840 | case DLM_RECO_NODE_DATA_DEAD: | |
6714d8e8 KH |
841 | case DLM_RECO_NODE_DATA_FINALIZE_SENT: |
842 | mlog(ML_ERROR, "bad ndata state for node %u:" | |
843 | " state=%d\n", ndata->node_num, | |
844 | ndata->state); | |
845 | BUG(); | |
846 | break; | |
e2faea4c KH |
847 | /* these states are possible at this point, anywhere along |
848 | * the line of recovery */ | |
849 | case DLM_RECO_NODE_DATA_DONE: | |
6714d8e8 KH |
850 | case DLM_RECO_NODE_DATA_RECEIVING: |
851 | case DLM_RECO_NODE_DATA_REQUESTED: | |
852 | case DLM_RECO_NODE_DATA_REQUESTING: | |
853 | mlog(0, "node %u is DONE sending " | |
854 | "recovery data!\n", | |
855 | ndata->node_num); | |
856 | ||
857 | ndata->state = DLM_RECO_NODE_DATA_DONE; | |
858 | ret = 0; | |
859 | break; | |
860 | } | |
861 | } | |
862 | spin_unlock(&dlm_reco_state_lock); | |
863 | ||
864 | /* wake the recovery thread, some node is done */ | |
865 | if (!ret) | |
866 | dlm_kick_recovery_thread(dlm); | |
867 | ||
868 | if (ret < 0) | |
869 | mlog(ML_ERROR, "failed to find recovery node data for node " | |
870 | "%u\n", done->node_idx); | |
871 | dlm_put(dlm); | |
872 | ||
873 | mlog(0, "leaving reco data done handler, ret=%d\n", ret); | |
874 | return ret; | |
875 | } | |
876 | ||
877 | static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm, | |
878 | struct list_head *list, | |
879 | u8 dead_node) | |
880 | { | |
881 | struct dlm_lock_resource *res; | |
882 | struct list_head *iter, *iter2; | |
e2faea4c | 883 | struct dlm_lock *lock; |
6714d8e8 KH |
884 | |
885 | spin_lock(&dlm->spinlock); | |
886 | list_for_each_safe(iter, iter2, &dlm->reco.resources) { | |
887 | res = list_entry (iter, struct dlm_lock_resource, recovering); | |
e2faea4c KH |
888 | /* always prune any $RECOVERY entries for dead nodes, |
889 | * otherwise hangs can occur during later recovery */ | |
6714d8e8 | 890 | if (dlm_is_recovery_lock(res->lockname.name, |
e2faea4c KH |
891 | res->lockname.len)) { |
892 | spin_lock(&res->spinlock); | |
893 | list_for_each_entry(lock, &res->granted, list) { | |
894 | if (lock->ml.node == dead_node) { | |
895 | mlog(0, "AHA! there was " | |
896 | "a $RECOVERY lock for dead " | |
897 | "node %u (%s)!\n", | |
898 | dead_node, dlm->name); | |
899 | list_del_init(&lock->list); | |
900 | dlm_lock_put(lock); | |
901 | break; | |
902 | } | |
903 | } | |
904 | spin_unlock(&res->spinlock); | |
6714d8e8 | 905 | continue; |
e2faea4c KH |
906 | } |
907 | ||
6714d8e8 KH |
908 | if (res->owner == dead_node) { |
909 | mlog(0, "found lockres owned by dead node while " | |
910 | "doing recovery for node %u. sending it.\n", | |
911 | dead_node); | |
912 | list_del_init(&res->recovering); | |
913 | list_add_tail(&res->recovering, list); | |
914 | } else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) { | |
915 | mlog(0, "found UNKNOWN owner while doing recovery " | |
916 | "for node %u. sending it.\n", dead_node); | |
917 | list_del_init(&res->recovering); | |
918 | list_add_tail(&res->recovering, list); | |
919 | } | |
920 | } | |
921 | spin_unlock(&dlm->spinlock); | |
922 | } | |
923 | ||
924 | static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res) | |
925 | { | |
926 | int total_locks = 0; | |
927 | struct list_head *iter, *queue = &res->granted; | |
928 | int i; | |
929 | ||
930 | for (i=0; i<3; i++) { | |
931 | list_for_each(iter, queue) | |
932 | total_locks++; | |
933 | queue++; | |
934 | } | |
935 | return total_locks; | |
936 | } | |
937 | ||
938 | ||
939 | static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm, | |
940 | struct dlm_migratable_lockres *mres, | |
941 | u8 send_to, | |
942 | struct dlm_lock_resource *res, | |
943 | int total_locks) | |
944 | { | |
945 | u64 mig_cookie = be64_to_cpu(mres->mig_cookie); | |
946 | int mres_total_locks = be32_to_cpu(mres->total_locks); | |
947 | int sz, ret = 0, status = 0; | |
948 | u8 orig_flags = mres->flags, | |
949 | orig_master = mres->master; | |
950 | ||
951 | BUG_ON(mres->num_locks > DLM_MAX_MIGRATABLE_LOCKS); | |
952 | if (!mres->num_locks) | |
953 | return 0; | |
954 | ||
955 | sz = sizeof(struct dlm_migratable_lockres) + | |
956 | (mres->num_locks * sizeof(struct dlm_migratable_lock)); | |
957 | ||
958 | /* add an all-done flag if we reached the last lock */ | |
959 | orig_flags = mres->flags; | |
960 | BUG_ON(total_locks > mres_total_locks); | |
961 | if (total_locks == mres_total_locks) | |
962 | mres->flags |= DLM_MRES_ALL_DONE; | |
963 | ||
964 | /* send it */ | |
965 | ret = o2net_send_message(DLM_MIG_LOCKRES_MSG, dlm->key, mres, | |
966 | sz, send_to, &status); | |
967 | if (ret < 0) { | |
968 | /* XXX: negative status is not handled. | |
969 | * this will end up killing this node. */ | |
970 | mlog_errno(ret); | |
971 | } else { | |
972 | /* might get an -ENOMEM back here */ | |
973 | ret = status; | |
974 | if (ret < 0) { | |
975 | mlog_errno(ret); | |
976 | ||
977 | if (ret == -EFAULT) { | |
978 | mlog(ML_ERROR, "node %u told me to kill " | |
979 | "myself!\n", send_to); | |
980 | BUG(); | |
981 | } | |
982 | } | |
983 | } | |
984 | ||
985 | /* zero and reinit the message buffer */ | |
986 | dlm_init_migratable_lockres(mres, res->lockname.name, | |
987 | res->lockname.len, mres_total_locks, | |
988 | mig_cookie, orig_flags, orig_master); | |
989 | return ret; | |
990 | } | |
991 | ||
992 | static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres, | |
993 | const char *lockname, int namelen, | |
994 | int total_locks, u64 cookie, | |
995 | u8 flags, u8 master) | |
996 | { | |
997 | /* mres here is one full page */ | |
998 | memset(mres, 0, PAGE_SIZE); | |
999 | mres->lockname_len = namelen; | |
1000 | memcpy(mres->lockname, lockname, namelen); | |
1001 | mres->num_locks = 0; | |
1002 | mres->total_locks = cpu_to_be32(total_locks); | |
1003 | mres->mig_cookie = cpu_to_be64(cookie); | |
1004 | mres->flags = flags; | |
1005 | mres->master = master; | |
1006 | } | |
1007 | ||
1008 | ||
1009 | /* returns 1 if this lock fills the network structure, | |
1010 | * 0 otherwise */ | |
1011 | static int dlm_add_lock_to_array(struct dlm_lock *lock, | |
1012 | struct dlm_migratable_lockres *mres, int queue) | |
1013 | { | |
1014 | struct dlm_migratable_lock *ml; | |
1015 | int lock_num = mres->num_locks; | |
1016 | ||
1017 | ml = &(mres->ml[lock_num]); | |
1018 | ml->cookie = lock->ml.cookie; | |
1019 | ml->type = lock->ml.type; | |
1020 | ml->convert_type = lock->ml.convert_type; | |
1021 | ml->highest_blocked = lock->ml.highest_blocked; | |
1022 | ml->list = queue; | |
1023 | if (lock->lksb) { | |
1024 | ml->flags = lock->lksb->flags; | |
1025 | /* send our current lvb */ | |
1026 | if (ml->type == LKM_EXMODE || | |
1027 | ml->type == LKM_PRMODE) { | |
1028 | /* if it is already set, this had better be a PR | |
1029 | * and it has to match */ | |
1030 | if (mres->lvb[0] && (ml->type == LKM_EXMODE || | |
1031 | memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN))) { | |
1032 | mlog(ML_ERROR, "mismatched lvbs!\n"); | |
1033 | __dlm_print_one_lock_resource(lock->lockres); | |
1034 | BUG(); | |
1035 | } | |
1036 | memcpy(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN); | |
1037 | } | |
1038 | } | |
1039 | ml->node = lock->ml.node; | |
1040 | mres->num_locks++; | |
1041 | /* we reached the max, send this network message */ | |
1042 | if (mres->num_locks == DLM_MAX_MIGRATABLE_LOCKS) | |
1043 | return 1; | |
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | ||
1048 | int dlm_send_one_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, | |
1049 | struct dlm_migratable_lockres *mres, | |
1050 | u8 send_to, u8 flags) | |
1051 | { | |
1052 | struct list_head *queue, *iter; | |
1053 | int total_locks, i; | |
1054 | u64 mig_cookie = 0; | |
1055 | struct dlm_lock *lock; | |
1056 | int ret = 0; | |
1057 | ||
1058 | BUG_ON(!(flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION))); | |
1059 | ||
1060 | mlog(0, "sending to %u\n", send_to); | |
1061 | ||
1062 | total_locks = dlm_num_locks_in_lockres(res); | |
1063 | if (total_locks > DLM_MAX_MIGRATABLE_LOCKS) { | |
1064 | /* rare, but possible */ | |
1065 | mlog(0, "argh. lockres has %d locks. this will " | |
1066 | "require more than one network packet to " | |
1067 | "migrate\n", total_locks); | |
1068 | mig_cookie = dlm_get_next_mig_cookie(); | |
1069 | } | |
1070 | ||
1071 | dlm_init_migratable_lockres(mres, res->lockname.name, | |
1072 | res->lockname.len, total_locks, | |
1073 | mig_cookie, flags, res->owner); | |
1074 | ||
1075 | total_locks = 0; | |
1076 | for (i=DLM_GRANTED_LIST; i<=DLM_BLOCKED_LIST; i++) { | |
1077 | queue = dlm_list_idx_to_ptr(res, i); | |
1078 | list_for_each(iter, queue) { | |
1079 | lock = list_entry (iter, struct dlm_lock, list); | |
1080 | ||
1081 | /* add another lock. */ | |
1082 | total_locks++; | |
1083 | if (!dlm_add_lock_to_array(lock, mres, i)) | |
1084 | continue; | |
1085 | ||
1086 | /* this filled the lock message, | |
1087 | * we must send it immediately. */ | |
1088 | ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, | |
1089 | res, total_locks); | |
1090 | if (ret < 0) { | |
1091 | // TODO | |
1092 | mlog(ML_ERROR, "dlm_send_mig_lockres_msg " | |
1093 | "returned %d, TODO\n", ret); | |
1094 | BUG(); | |
1095 | } | |
1096 | } | |
1097 | } | |
1098 | /* flush any remaining locks */ | |
1099 | ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, res, total_locks); | |
1100 | if (ret < 0) { | |
1101 | // TODO | |
1102 | mlog(ML_ERROR, "dlm_send_mig_lockres_msg returned %d, " | |
1103 | "TODO\n", ret); | |
1104 | BUG(); | |
1105 | } | |
1106 | return ret; | |
1107 | } | |
1108 | ||
1109 | ||
1110 | ||
1111 | /* | |
1112 | * this message will contain no more than one page worth of | |
1113 | * recovery data, and it will work on only one lockres. | |
1114 | * there may be many locks in this page, and we may need to wait | |
1115 | * for additional packets to complete all the locks (rare, but | |
1116 | * possible). | |
1117 | */ | |
1118 | /* | |
1119 | * NOTE: the allocation error cases here are scary | |
1120 | * we really cannot afford to fail an alloc in recovery | |
1121 | * do we spin? returning an error only delays the problem really | |
1122 | */ | |
1123 | ||
1124 | int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data) | |
1125 | { | |
1126 | struct dlm_ctxt *dlm = data; | |
1127 | struct dlm_migratable_lockres *mres = | |
1128 | (struct dlm_migratable_lockres *)msg->buf; | |
1129 | int ret = 0; | |
1130 | u8 real_master; | |
1131 | char *buf = NULL; | |
1132 | struct dlm_work_item *item = NULL; | |
1133 | struct dlm_lock_resource *res = NULL; | |
1134 | ||
1135 | if (!dlm_grab(dlm)) | |
1136 | return -EINVAL; | |
1137 | ||
1138 | BUG_ON(!(mres->flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION))); | |
1139 | ||
1140 | real_master = mres->master; | |
1141 | if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) { | |
1142 | /* cannot migrate a lockres with no master */ | |
1143 | BUG_ON(!(mres->flags & DLM_MRES_RECOVERY)); | |
1144 | } | |
1145 | ||
1146 | mlog(0, "%s message received from node %u\n", | |
1147 | (mres->flags & DLM_MRES_RECOVERY) ? | |
1148 | "recovery" : "migration", mres->master); | |
1149 | if (mres->flags & DLM_MRES_ALL_DONE) | |
1150 | mlog(0, "all done flag. all lockres data received!\n"); | |
1151 | ||
1152 | ret = -ENOMEM; | |
1153 | buf = kmalloc(be16_to_cpu(msg->data_len), GFP_KERNEL); | |
1154 | item = kcalloc(1, sizeof(*item), GFP_KERNEL); | |
1155 | if (!buf || !item) | |
1156 | goto leave; | |
1157 | ||
1158 | /* lookup the lock to see if we have a secondary queue for this | |
1159 | * already... just add the locks in and this will have its owner | |
1160 | * and RECOVERY flag changed when it completes. */ | |
1161 | res = dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len); | |
1162 | if (res) { | |
1163 | /* this will get a ref on res */ | |
1164 | /* mark it as recovering/migrating and hash it */ | |
1165 | spin_lock(&res->spinlock); | |
1166 | if (mres->flags & DLM_MRES_RECOVERY) { | |
1167 | res->state |= DLM_LOCK_RES_RECOVERING; | |
1168 | } else { | |
1169 | if (res->state & DLM_LOCK_RES_MIGRATING) { | |
1170 | /* this is at least the second | |
1171 | * lockres message */ | |
1172 | mlog(0, "lock %.*s is already migrating\n", | |
1173 | mres->lockname_len, | |
1174 | mres->lockname); | |
1175 | } else if (res->state & DLM_LOCK_RES_RECOVERING) { | |
1176 | /* caller should BUG */ | |
1177 | mlog(ML_ERROR, "node is attempting to migrate " | |
1178 | "lock %.*s, but marked as recovering!\n", | |
1179 | mres->lockname_len, mres->lockname); | |
1180 | ret = -EFAULT; | |
1181 | spin_unlock(&res->spinlock); | |
1182 | goto leave; | |
1183 | } | |
1184 | res->state |= DLM_LOCK_RES_MIGRATING; | |
1185 | } | |
1186 | spin_unlock(&res->spinlock); | |
1187 | } else { | |
1188 | /* need to allocate, just like if it was | |
1189 | * mastered here normally */ | |
1190 | res = dlm_new_lockres(dlm, mres->lockname, mres->lockname_len); | |
1191 | if (!res) | |
1192 | goto leave; | |
1193 | ||
1194 | /* to match the ref that we would have gotten if | |
1195 | * dlm_lookup_lockres had succeeded */ | |
1196 | dlm_lockres_get(res); | |
1197 | ||
1198 | /* mark it as recovering/migrating and hash it */ | |
1199 | if (mres->flags & DLM_MRES_RECOVERY) | |
1200 | res->state |= DLM_LOCK_RES_RECOVERING; | |
1201 | else | |
1202 | res->state |= DLM_LOCK_RES_MIGRATING; | |
1203 | ||
1204 | spin_lock(&dlm->spinlock); | |
1205 | __dlm_insert_lockres(dlm, res); | |
1206 | spin_unlock(&dlm->spinlock); | |
1207 | ||
1208 | /* now that the new lockres is inserted, | |
1209 | * make it usable by other processes */ | |
1210 | spin_lock(&res->spinlock); | |
1211 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
1212 | spin_unlock(&res->spinlock); | |
1213 | ||
1214 | /* add an extra ref for just-allocated lockres | |
1215 | * otherwise the lockres will be purged immediately */ | |
1216 | dlm_lockres_get(res); | |
1217 | ||
1218 | } | |
1219 | ||
1220 | /* at this point we have allocated everything we need, | |
1221 | * and we have a hashed lockres with an extra ref and | |
1222 | * the proper res->state flags. */ | |
1223 | ret = 0; | |
1224 | if (mres->master == DLM_LOCK_RES_OWNER_UNKNOWN) { | |
1225 | /* migration cannot have an unknown master */ | |
1226 | BUG_ON(!(mres->flags & DLM_MRES_RECOVERY)); | |
1227 | mlog(0, "recovery has passed me a lockres with an " | |
1228 | "unknown owner.. will need to requery: " | |
1229 | "%.*s\n", mres->lockname_len, mres->lockname); | |
1230 | } else { | |
1231 | spin_lock(&res->spinlock); | |
1232 | dlm_change_lockres_owner(dlm, res, dlm->node_num); | |
1233 | spin_unlock(&res->spinlock); | |
1234 | } | |
1235 | ||
1236 | /* queue up work for dlm_mig_lockres_worker */ | |
1237 | dlm_grab(dlm); /* get an extra ref for the work item */ | |
1238 | memcpy(buf, msg->buf, be16_to_cpu(msg->data_len)); /* copy the whole message */ | |
1239 | dlm_init_work_item(dlm, item, dlm_mig_lockres_worker, buf); | |
1240 | item->u.ml.lockres = res; /* already have a ref */ | |
1241 | item->u.ml.real_master = real_master; | |
1242 | spin_lock(&dlm->work_lock); | |
1243 | list_add_tail(&item->list, &dlm->work_list); | |
1244 | spin_unlock(&dlm->work_lock); | |
1245 | schedule_work(&dlm->dispatched_work); | |
1246 | ||
1247 | leave: | |
1248 | dlm_put(dlm); | |
1249 | if (ret < 0) { | |
1250 | if (buf) | |
1251 | kfree(buf); | |
1252 | if (item) | |
1253 | kfree(item); | |
1254 | } | |
1255 | ||
1256 | mlog_exit(ret); | |
1257 | return ret; | |
1258 | } | |
1259 | ||
1260 | ||
1261 | static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data) | |
1262 | { | |
1263 | struct dlm_ctxt *dlm = data; | |
1264 | struct dlm_migratable_lockres *mres; | |
1265 | int ret = 0; | |
1266 | struct dlm_lock_resource *res; | |
1267 | u8 real_master; | |
1268 | ||
1269 | dlm = item->dlm; | |
1270 | mres = (struct dlm_migratable_lockres *)data; | |
1271 | ||
1272 | res = item->u.ml.lockres; | |
1273 | real_master = item->u.ml.real_master; | |
1274 | ||
1275 | if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) { | |
1276 | /* this case is super-rare. only occurs if | |
1277 | * node death happens during migration. */ | |
1278 | again: | |
1279 | ret = dlm_lockres_master_requery(dlm, res, &real_master); | |
1280 | if (ret < 0) { | |
e2faea4c | 1281 | mlog(0, "dlm_lockres_master_requery ret=%d\n", |
6714d8e8 KH |
1282 | ret); |
1283 | goto again; | |
1284 | } | |
1285 | if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) { | |
1286 | mlog(0, "lockres %.*s not claimed. " | |
1287 | "this node will take it.\n", | |
1288 | res->lockname.len, res->lockname.name); | |
1289 | } else { | |
1290 | mlog(0, "master needs to respond to sender " | |
1291 | "that node %u still owns %.*s\n", | |
1292 | real_master, res->lockname.len, | |
1293 | res->lockname.name); | |
1294 | /* cannot touch this lockres */ | |
1295 | goto leave; | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | ret = dlm_process_recovery_data(dlm, res, mres); | |
1300 | if (ret < 0) | |
1301 | mlog(0, "dlm_process_recovery_data returned %d\n", ret); | |
1302 | else | |
1303 | mlog(0, "dlm_process_recovery_data succeeded\n"); | |
1304 | ||
1305 | if ((mres->flags & (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) == | |
1306 | (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) { | |
1307 | ret = dlm_finish_migration(dlm, res, mres->master); | |
1308 | if (ret < 0) | |
1309 | mlog_errno(ret); | |
1310 | } | |
1311 | ||
1312 | leave: | |
1313 | kfree(data); | |
1314 | mlog_exit(ret); | |
1315 | } | |
1316 | ||
1317 | ||
1318 | ||
1319 | static int dlm_lockres_master_requery(struct dlm_ctxt *dlm, | |
1320 | struct dlm_lock_resource *res, | |
1321 | u8 *real_master) | |
1322 | { | |
1323 | struct dlm_node_iter iter; | |
1324 | int nodenum; | |
1325 | int ret = 0; | |
1326 | ||
1327 | *real_master = DLM_LOCK_RES_OWNER_UNKNOWN; | |
1328 | ||
1329 | /* we only reach here if one of the two nodes in a | |
1330 | * migration died while the migration was in progress. | |
1331 | * at this point we need to requery the master. we | |
1332 | * know that the new_master got as far as creating | |
1333 | * an mle on at least one node, but we do not know | |
1334 | * if any nodes had actually cleared the mle and set | |
1335 | * the master to the new_master. the old master | |
1336 | * is supposed to set the owner to UNKNOWN in the | |
1337 | * event of a new_master death, so the only possible | |
1338 | * responses that we can get from nodes here are | |
1339 | * that the master is new_master, or that the master | |
1340 | * is UNKNOWN. | |
1341 | * if all nodes come back with UNKNOWN then we know | |
1342 | * the lock needs remastering here. | |
1343 | * if any node comes back with a valid master, check | |
1344 | * to see if that master is the one that we are | |
1345 | * recovering. if so, then the new_master died and | |
1346 | * we need to remaster this lock. if not, then the | |
1347 | * new_master survived and that node will respond to | |
1348 | * other nodes about the owner. | |
1349 | * if there is an owner, this node needs to dump this | |
1350 | * lockres and alert the sender that this lockres | |
1351 | * was rejected. */ | |
1352 | spin_lock(&dlm->spinlock); | |
1353 | dlm_node_iter_init(dlm->domain_map, &iter); | |
1354 | spin_unlock(&dlm->spinlock); | |
1355 | ||
1356 | while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { | |
1357 | /* do not send to self */ | |
1358 | if (nodenum == dlm->node_num) | |
1359 | continue; | |
1360 | ret = dlm_do_master_requery(dlm, res, nodenum, real_master); | |
1361 | if (ret < 0) { | |
1362 | mlog_errno(ret); | |
1363 | BUG(); | |
1364 | /* TODO: need to figure a way to restart this */ | |
1365 | } | |
1366 | if (*real_master != DLM_LOCK_RES_OWNER_UNKNOWN) { | |
1367 | mlog(0, "lock master is %u\n", *real_master); | |
1368 | break; | |
1369 | } | |
1370 | } | |
1371 | return ret; | |
1372 | } | |
1373 | ||
1374 | ||
1375 | static int dlm_do_master_requery(struct dlm_ctxt *dlm, | |
1376 | struct dlm_lock_resource *res, | |
1377 | u8 nodenum, u8 *real_master) | |
1378 | { | |
1379 | int ret = -EINVAL; | |
1380 | struct dlm_master_requery req; | |
1381 | int status = DLM_LOCK_RES_OWNER_UNKNOWN; | |
1382 | ||
1383 | memset(&req, 0, sizeof(req)); | |
1384 | req.node_idx = dlm->node_num; | |
1385 | req.namelen = res->lockname.len; | |
1386 | memcpy(req.name, res->lockname.name, res->lockname.len); | |
1387 | ||
1388 | ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key, | |
1389 | &req, sizeof(req), nodenum, &status); | |
1390 | /* XXX: negative status not handled properly here. */ | |
1391 | if (ret < 0) | |
1392 | mlog_errno(ret); | |
1393 | else { | |
1394 | BUG_ON(status < 0); | |
1395 | BUG_ON(status > DLM_LOCK_RES_OWNER_UNKNOWN); | |
1396 | *real_master = (u8) (status & 0xff); | |
1397 | mlog(0, "node %u responded to master requery with %u\n", | |
1398 | nodenum, *real_master); | |
1399 | ret = 0; | |
1400 | } | |
1401 | return ret; | |
1402 | } | |
1403 | ||
1404 | ||
1405 | /* this function cannot error, so unless the sending | |
1406 | * or receiving of the message failed, the owner can | |
1407 | * be trusted */ | |
1408 | int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data) | |
1409 | { | |
1410 | struct dlm_ctxt *dlm = data; | |
1411 | struct dlm_master_requery *req = (struct dlm_master_requery *)msg->buf; | |
1412 | struct dlm_lock_resource *res = NULL; | |
1413 | int master = DLM_LOCK_RES_OWNER_UNKNOWN; | |
1414 | u32 flags = DLM_ASSERT_MASTER_REQUERY; | |
1415 | ||
1416 | if (!dlm_grab(dlm)) { | |
1417 | /* since the domain has gone away on this | |
1418 | * node, the proper response is UNKNOWN */ | |
1419 | return master; | |
1420 | } | |
1421 | ||
1422 | spin_lock(&dlm->spinlock); | |
1423 | res = __dlm_lookup_lockres(dlm, req->name, req->namelen); | |
1424 | if (res) { | |
1425 | spin_lock(&res->spinlock); | |
1426 | master = res->owner; | |
1427 | if (master == dlm->node_num) { | |
1428 | int ret = dlm_dispatch_assert_master(dlm, res, | |
1429 | 0, 0, flags); | |
1430 | if (ret < 0) { | |
1431 | mlog_errno(-ENOMEM); | |
1432 | /* retry!? */ | |
1433 | BUG(); | |
1434 | } | |
1435 | } | |
1436 | spin_unlock(&res->spinlock); | |
1437 | } | |
1438 | spin_unlock(&dlm->spinlock); | |
1439 | ||
1440 | dlm_put(dlm); | |
1441 | return master; | |
1442 | } | |
1443 | ||
1444 | static inline struct list_head * | |
1445 | dlm_list_num_to_pointer(struct dlm_lock_resource *res, int list_num) | |
1446 | { | |
1447 | struct list_head *ret; | |
1448 | BUG_ON(list_num < 0); | |
1449 | BUG_ON(list_num > 2); | |
1450 | ret = &(res->granted); | |
1451 | ret += list_num; | |
1452 | return ret; | |
1453 | } | |
1454 | /* TODO: do ast flush business | |
1455 | * TODO: do MIGRATING and RECOVERING spinning | |
1456 | */ | |
1457 | ||
1458 | /* | |
1459 | * NOTE about in-flight requests during migration: | |
1460 | * | |
1461 | * Before attempting the migrate, the master has marked the lockres as | |
1462 | * MIGRATING and then flushed all of its pending ASTS. So any in-flight | |
1463 | * requests either got queued before the MIGRATING flag got set, in which | |
1464 | * case the lock data will reflect the change and a return message is on | |
1465 | * the way, or the request failed to get in before MIGRATING got set. In | |
1466 | * this case, the caller will be told to spin and wait for the MIGRATING | |
1467 | * flag to be dropped, then recheck the master. | |
1468 | * This holds true for the convert, cancel and unlock cases, and since lvb | |
1469 | * updates are tied to these same messages, it applies to lvb updates as | |
1470 | * well. For the lock case, there is no way a lock can be on the master | |
1471 | * queue and not be on the secondary queue since the lock is always added | |
1472 | * locally first. This means that the new target node will never be sent | |
1473 | * a lock that he doesn't already have on the list. | |
1474 | * In total, this means that the local lock is correct and should not be | |
1475 | * updated to match the one sent by the master. Any messages sent back | |
1476 | * from the master before the MIGRATING flag will bring the lock properly | |
1477 | * up-to-date, and the change will be ordered properly for the waiter. | |
1478 | * We will *not* attempt to modify the lock underneath the waiter. | |
1479 | */ | |
1480 | ||
1481 | static int dlm_process_recovery_data(struct dlm_ctxt *dlm, | |
1482 | struct dlm_lock_resource *res, | |
1483 | struct dlm_migratable_lockres *mres) | |
1484 | { | |
1485 | struct dlm_migratable_lock *ml; | |
1486 | struct list_head *queue; | |
1487 | struct dlm_lock *newlock = NULL; | |
1488 | struct dlm_lockstatus *lksb = NULL; | |
1489 | int ret = 0; | |
1490 | int i; | |
1491 | struct list_head *iter; | |
1492 | struct dlm_lock *lock = NULL; | |
1493 | ||
1494 | mlog(0, "running %d locks for this lockres\n", mres->num_locks); | |
1495 | for (i=0; i<mres->num_locks; i++) { | |
1496 | ml = &(mres->ml[i]); | |
1497 | BUG_ON(ml->highest_blocked != LKM_IVMODE); | |
1498 | newlock = NULL; | |
1499 | lksb = NULL; | |
1500 | ||
1501 | queue = dlm_list_num_to_pointer(res, ml->list); | |
1502 | ||
1503 | /* if the lock is for the local node it needs to | |
1504 | * be moved to the proper location within the queue. | |
1505 | * do not allocate a new lock structure. */ | |
1506 | if (ml->node == dlm->node_num) { | |
1507 | /* MIGRATION ONLY! */ | |
1508 | BUG_ON(!(mres->flags & DLM_MRES_MIGRATION)); | |
1509 | ||
1510 | spin_lock(&res->spinlock); | |
1511 | list_for_each(iter, queue) { | |
1512 | lock = list_entry (iter, struct dlm_lock, list); | |
1513 | if (lock->ml.cookie != ml->cookie) | |
1514 | lock = NULL; | |
1515 | else | |
1516 | break; | |
1517 | } | |
1518 | ||
1519 | /* lock is always created locally first, and | |
1520 | * destroyed locally last. it must be on the list */ | |
1521 | if (!lock) { | |
1522 | mlog(ML_ERROR, "could not find local lock " | |
1523 | "with cookie %"MLFu64"!\n", | |
1524 | ml->cookie); | |
1525 | BUG(); | |
1526 | } | |
1527 | BUG_ON(lock->ml.node != ml->node); | |
1528 | ||
1529 | /* see NOTE above about why we do not update | |
1530 | * to match the master here */ | |
1531 | ||
1532 | /* move the lock to its proper place */ | |
1533 | /* do not alter lock refcount. switching lists. */ | |
1534 | list_del_init(&lock->list); | |
1535 | list_add_tail(&lock->list, queue); | |
1536 | spin_unlock(&res->spinlock); | |
1537 | ||
1538 | mlog(0, "just reordered a local lock!\n"); | |
1539 | continue; | |
1540 | } | |
1541 | ||
1542 | /* lock is for another node. */ | |
1543 | newlock = dlm_new_lock(ml->type, ml->node, | |
1544 | be64_to_cpu(ml->cookie), NULL); | |
1545 | if (!newlock) { | |
1546 | ret = -ENOMEM; | |
1547 | goto leave; | |
1548 | } | |
1549 | lksb = newlock->lksb; | |
1550 | dlm_lock_attach_lockres(newlock, res); | |
1551 | ||
1552 | if (ml->convert_type != LKM_IVMODE) { | |
1553 | BUG_ON(queue != &res->converting); | |
1554 | newlock->ml.convert_type = ml->convert_type; | |
1555 | } | |
1556 | lksb->flags |= (ml->flags & | |
1557 | (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); | |
1558 | ||
1559 | if (mres->lvb[0]) { | |
1560 | if (lksb->flags & DLM_LKSB_PUT_LVB) { | |
1561 | /* other node was trying to update | |
1562 | * lvb when node died. recreate the | |
1563 | * lksb with the updated lvb. */ | |
1564 | memcpy(lksb->lvb, mres->lvb, DLM_LVB_LEN); | |
1565 | } else { | |
1566 | /* otherwise, the node is sending its | |
1567 | * most recent valid lvb info */ | |
1568 | BUG_ON(ml->type != LKM_EXMODE && | |
1569 | ml->type != LKM_PRMODE); | |
1570 | if (res->lvb[0] && (ml->type == LKM_EXMODE || | |
1571 | memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) { | |
1572 | mlog(ML_ERROR, "received bad lvb!\n"); | |
1573 | __dlm_print_one_lock_resource(res); | |
1574 | BUG(); | |
1575 | } | |
1576 | memcpy(res->lvb, mres->lvb, DLM_LVB_LEN); | |
1577 | } | |
1578 | } | |
1579 | ||
1580 | ||
1581 | /* NOTE: | |
1582 | * wrt lock queue ordering and recovery: | |
1583 | * 1. order of locks on granted queue is | |
1584 | * meaningless. | |
1585 | * 2. order of locks on converting queue is | |
1586 | * LOST with the node death. sorry charlie. | |
1587 | * 3. order of locks on the blocked queue is | |
1588 | * also LOST. | |
1589 | * order of locks does not affect integrity, it | |
1590 | * just means that a lock request may get pushed | |
1591 | * back in line as a result of the node death. | |
1592 | * also note that for a given node the lock order | |
1593 | * for its secondary queue locks is preserved | |
1594 | * relative to each other, but clearly *not* | |
1595 | * preserved relative to locks from other nodes. | |
1596 | */ | |
1597 | spin_lock(&res->spinlock); | |
1598 | dlm_lock_get(newlock); | |
1599 | list_add_tail(&newlock->list, queue); | |
1600 | spin_unlock(&res->spinlock); | |
1601 | } | |
1602 | mlog(0, "done running all the locks\n"); | |
1603 | ||
1604 | leave: | |
1605 | if (ret < 0) { | |
1606 | mlog_errno(ret); | |
1607 | if (newlock) | |
1608 | dlm_lock_put(newlock); | |
1609 | } | |
1610 | ||
1611 | mlog_exit(ret); | |
1612 | return ret; | |
1613 | } | |
1614 | ||
1615 | void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm, | |
1616 | struct dlm_lock_resource *res) | |
1617 | { | |
1618 | int i; | |
1619 | struct list_head *queue, *iter, *iter2; | |
1620 | struct dlm_lock *lock; | |
1621 | ||
1622 | res->state |= DLM_LOCK_RES_RECOVERING; | |
1623 | if (!list_empty(&res->recovering)) | |
1624 | list_del_init(&res->recovering); | |
1625 | list_add_tail(&res->recovering, &dlm->reco.resources); | |
1626 | ||
1627 | /* find any pending locks and put them back on proper list */ | |
1628 | for (i=DLM_BLOCKED_LIST; i>=DLM_GRANTED_LIST; i--) { | |
1629 | queue = dlm_list_idx_to_ptr(res, i); | |
1630 | list_for_each_safe(iter, iter2, queue) { | |
1631 | lock = list_entry (iter, struct dlm_lock, list); | |
1632 | dlm_lock_get(lock); | |
1633 | if (lock->convert_pending) { | |
1634 | /* move converting lock back to granted */ | |
1635 | BUG_ON(i != DLM_CONVERTING_LIST); | |
1636 | mlog(0, "node died with convert pending " | |
1637 | "on %.*s. move back to granted list.\n", | |
1638 | res->lockname.len, res->lockname.name); | |
1639 | dlm_revert_pending_convert(res, lock); | |
1640 | lock->convert_pending = 0; | |
1641 | } else if (lock->lock_pending) { | |
1642 | /* remove pending lock requests completely */ | |
1643 | BUG_ON(i != DLM_BLOCKED_LIST); | |
1644 | mlog(0, "node died with lock pending " | |
1645 | "on %.*s. remove from blocked list and skip.\n", | |
1646 | res->lockname.len, res->lockname.name); | |
1647 | /* lock will be floating until ref in | |
1648 | * dlmlock_remote is freed after the network | |
1649 | * call returns. ok for it to not be on any | |
1650 | * list since no ast can be called | |
1651 | * (the master is dead). */ | |
1652 | dlm_revert_pending_lock(res, lock); | |
1653 | lock->lock_pending = 0; | |
1654 | } else if (lock->unlock_pending) { | |
1655 | /* if an unlock was in progress, treat as | |
1656 | * if this had completed successfully | |
1657 | * before sending this lock state to the | |
1658 | * new master. note that the dlm_unlock | |
1659 | * call is still responsible for calling | |
1660 | * the unlockast. that will happen after | |
1661 | * the network call times out. for now, | |
1662 | * just move lists to prepare the new | |
1663 | * recovery master. */ | |
1664 | BUG_ON(i != DLM_GRANTED_LIST); | |
1665 | mlog(0, "node died with unlock pending " | |
1666 | "on %.*s. remove from blocked list and skip.\n", | |
1667 | res->lockname.len, res->lockname.name); | |
1668 | dlm_commit_pending_unlock(res, lock); | |
1669 | lock->unlock_pending = 0; | |
1670 | } else if (lock->cancel_pending) { | |
1671 | /* if a cancel was in progress, treat as | |
1672 | * if this had completed successfully | |
1673 | * before sending this lock state to the | |
1674 | * new master */ | |
1675 | BUG_ON(i != DLM_CONVERTING_LIST); | |
1676 | mlog(0, "node died with cancel pending " | |
1677 | "on %.*s. move back to granted list.\n", | |
1678 | res->lockname.len, res->lockname.name); | |
1679 | dlm_commit_pending_cancel(res, lock); | |
1680 | lock->cancel_pending = 0; | |
1681 | } | |
1682 | dlm_lock_put(lock); | |
1683 | } | |
1684 | } | |
1685 | } | |
1686 | ||
1687 | ||
1688 | ||
1689 | /* removes all recovered locks from the recovery list. | |
1690 | * sets the res->owner to the new master. | |
1691 | * unsets the RECOVERY flag and wakes waiters. */ | |
1692 | static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm, | |
1693 | u8 dead_node, u8 new_master) | |
1694 | { | |
1695 | int i; | |
1696 | struct list_head *iter, *iter2, *bucket; | |
1697 | struct dlm_lock_resource *res; | |
1698 | ||
1699 | mlog_entry_void(); | |
1700 | ||
1701 | assert_spin_locked(&dlm->spinlock); | |
1702 | ||
1703 | list_for_each_safe(iter, iter2, &dlm->reco.resources) { | |
1704 | res = list_entry (iter, struct dlm_lock_resource, recovering); | |
1705 | if (res->owner == dead_node) { | |
1706 | list_del_init(&res->recovering); | |
1707 | spin_lock(&res->spinlock); | |
1708 | dlm_change_lockres_owner(dlm, res, new_master); | |
1709 | res->state &= ~DLM_LOCK_RES_RECOVERING; | |
1710 | __dlm_dirty_lockres(dlm, res); | |
1711 | spin_unlock(&res->spinlock); | |
1712 | wake_up(&res->wq); | |
1713 | } | |
1714 | } | |
1715 | ||
1716 | /* this will become unnecessary eventually, but | |
1717 | * for now we need to run the whole hash, clear | |
1718 | * the RECOVERING state and set the owner | |
1719 | * if necessary */ | |
1720 | for (i=0; i<DLM_HASH_SIZE; i++) { | |
1721 | bucket = &(dlm->resources[i]); | |
1722 | list_for_each(iter, bucket) { | |
1723 | res = list_entry (iter, struct dlm_lock_resource, list); | |
1724 | if (res->state & DLM_LOCK_RES_RECOVERING) { | |
1725 | if (res->owner == dead_node) { | |
1726 | mlog(0, "(this=%u) res %.*s owner=%u " | |
1727 | "was not on recovering list, but " | |
1728 | "clearing state anyway\n", | |
1729 | dlm->node_num, res->lockname.len, | |
1730 | res->lockname.name, new_master); | |
1731 | } else if (res->owner == dlm->node_num) { | |
1732 | mlog(0, "(this=%u) res %.*s owner=%u " | |
1733 | "was not on recovering list, " | |
1734 | "owner is THIS node, clearing\n", | |
1735 | dlm->node_num, res->lockname.len, | |
1736 | res->lockname.name, new_master); | |
1737 | } else | |
1738 | continue; | |
1739 | ||
1740 | spin_lock(&res->spinlock); | |
1741 | dlm_change_lockres_owner(dlm, res, new_master); | |
1742 | res->state &= ~DLM_LOCK_RES_RECOVERING; | |
1743 | __dlm_dirty_lockres(dlm, res); | |
1744 | spin_unlock(&res->spinlock); | |
1745 | wake_up(&res->wq); | |
1746 | } | |
1747 | } | |
1748 | } | |
1749 | } | |
1750 | ||
1751 | static inline int dlm_lvb_needs_invalidation(struct dlm_lock *lock, int local) | |
1752 | { | |
1753 | if (local) { | |
1754 | if (lock->ml.type != LKM_EXMODE && | |
1755 | lock->ml.type != LKM_PRMODE) | |
1756 | return 1; | |
1757 | } else if (lock->ml.type == LKM_EXMODE) | |
1758 | return 1; | |
1759 | return 0; | |
1760 | } | |
1761 | ||
1762 | static void dlm_revalidate_lvb(struct dlm_ctxt *dlm, | |
1763 | struct dlm_lock_resource *res, u8 dead_node) | |
1764 | { | |
1765 | struct list_head *iter, *queue; | |
1766 | struct dlm_lock *lock; | |
1767 | int blank_lvb = 0, local = 0; | |
1768 | int i; | |
1769 | u8 search_node; | |
1770 | ||
1771 | assert_spin_locked(&dlm->spinlock); | |
1772 | assert_spin_locked(&res->spinlock); | |
1773 | ||
1774 | if (res->owner == dlm->node_num) | |
1775 | /* if this node owned the lockres, and if the dead node | |
1776 | * had an EX when he died, blank out the lvb */ | |
1777 | search_node = dead_node; | |
1778 | else { | |
1779 | /* if this is a secondary lockres, and we had no EX or PR | |
1780 | * locks granted, we can no longer trust the lvb */ | |
1781 | search_node = dlm->node_num; | |
1782 | local = 1; /* check local state for valid lvb */ | |
1783 | } | |
1784 | ||
1785 | for (i=DLM_GRANTED_LIST; i<=DLM_CONVERTING_LIST; i++) { | |
1786 | queue = dlm_list_idx_to_ptr(res, i); | |
1787 | list_for_each(iter, queue) { | |
1788 | lock = list_entry (iter, struct dlm_lock, list); | |
1789 | if (lock->ml.node == search_node) { | |
1790 | if (dlm_lvb_needs_invalidation(lock, local)) { | |
1791 | /* zero the lksb lvb and lockres lvb */ | |
1792 | blank_lvb = 1; | |
1793 | memset(lock->lksb->lvb, 0, DLM_LVB_LEN); | |
1794 | } | |
1795 | } | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | if (blank_lvb) { | |
1800 | mlog(0, "clearing %.*s lvb, dead node %u had EX\n", | |
1801 | res->lockname.len, res->lockname.name, dead_node); | |
1802 | memset(res->lvb, 0, DLM_LVB_LEN); | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | static void dlm_free_dead_locks(struct dlm_ctxt *dlm, | |
1807 | struct dlm_lock_resource *res, u8 dead_node) | |
1808 | { | |
1809 | struct list_head *iter, *tmpiter; | |
1810 | struct dlm_lock *lock; | |
1811 | ||
1812 | /* this node is the lockres master: | |
1813 | * 1) remove any stale locks for the dead node | |
1814 | * 2) if the dead node had an EX when he died, blank out the lvb | |
1815 | */ | |
1816 | assert_spin_locked(&dlm->spinlock); | |
1817 | assert_spin_locked(&res->spinlock); | |
1818 | ||
1819 | /* TODO: check pending_asts, pending_basts here */ | |
1820 | list_for_each_safe(iter, tmpiter, &res->granted) { | |
1821 | lock = list_entry (iter, struct dlm_lock, list); | |
1822 | if (lock->ml.node == dead_node) { | |
1823 | list_del_init(&lock->list); | |
1824 | dlm_lock_put(lock); | |
1825 | } | |
1826 | } | |
1827 | list_for_each_safe(iter, tmpiter, &res->converting) { | |
1828 | lock = list_entry (iter, struct dlm_lock, list); | |
1829 | if (lock->ml.node == dead_node) { | |
1830 | list_del_init(&lock->list); | |
1831 | dlm_lock_put(lock); | |
1832 | } | |
1833 | } | |
1834 | list_for_each_safe(iter, tmpiter, &res->blocked) { | |
1835 | lock = list_entry (iter, struct dlm_lock, list); | |
1836 | if (lock->ml.node == dead_node) { | |
1837 | list_del_init(&lock->list); | |
1838 | dlm_lock_put(lock); | |
1839 | } | |
1840 | } | |
1841 | ||
1842 | /* do not kick thread yet */ | |
1843 | __dlm_dirty_lockres(dlm, res); | |
1844 | } | |
1845 | ||
1846 | /* if this node is the recovery master, and there are no | |
1847 | * locks for a given lockres owned by this node that are in | |
1848 | * either PR or EX mode, zero out the lvb before requesting. | |
1849 | * | |
1850 | */ | |
1851 | ||
1852 | ||
1853 | static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node) | |
1854 | { | |
1855 | struct list_head *iter; | |
1856 | struct dlm_lock_resource *res; | |
1857 | int i; | |
1858 | struct list_head *bucket; | |
e2faea4c | 1859 | struct dlm_lock *lock; |
6714d8e8 KH |
1860 | |
1861 | ||
1862 | /* purge any stale mles */ | |
1863 | dlm_clean_master_list(dlm, dead_node); | |
1864 | ||
1865 | /* | |
1866 | * now clean up all lock resources. there are two rules: | |
1867 | * | |
1868 | * 1) if the dead node was the master, move the lockres | |
1869 | * to the recovering list. set the RECOVERING flag. | |
1870 | * this lockres needs to be cleaned up before it can | |
1871 | * be used further. | |
1872 | * | |
1873 | * 2) if this node was the master, remove all locks from | |
1874 | * each of the lockres queues that were owned by the | |
1875 | * dead node. once recovery finishes, the dlm thread | |
1876 | * can be kicked again to see if any ASTs or BASTs | |
1877 | * need to be fired as a result. | |
1878 | */ | |
1879 | for (i=0; i<DLM_HASH_SIZE; i++) { | |
1880 | bucket = &(dlm->resources[i]); | |
1881 | list_for_each(iter, bucket) { | |
1882 | res = list_entry (iter, struct dlm_lock_resource, list); | |
e2faea4c KH |
1883 | /* always prune any $RECOVERY entries for dead nodes, |
1884 | * otherwise hangs can occur during later recovery */ | |
6714d8e8 | 1885 | if (dlm_is_recovery_lock(res->lockname.name, |
e2faea4c KH |
1886 | res->lockname.len)) { |
1887 | spin_lock(&res->spinlock); | |
1888 | list_for_each_entry(lock, &res->granted, list) { | |
1889 | if (lock->ml.node == dead_node) { | |
1890 | mlog(0, "AHA! there was " | |
1891 | "a $RECOVERY lock for dead " | |
1892 | "node %u (%s)!\n", | |
1893 | dead_node, dlm->name); | |
1894 | list_del_init(&lock->list); | |
1895 | dlm_lock_put(lock); | |
1896 | break; | |
1897 | } | |
1898 | } | |
1899 | spin_unlock(&res->spinlock); | |
6714d8e8 | 1900 | continue; |
e2faea4c | 1901 | } |
6714d8e8 KH |
1902 | spin_lock(&res->spinlock); |
1903 | /* zero the lvb if necessary */ | |
1904 | dlm_revalidate_lvb(dlm, res, dead_node); | |
1905 | if (res->owner == dead_node) | |
1906 | dlm_move_lockres_to_recovery_list(dlm, res); | |
1907 | else if (res->owner == dlm->node_num) { | |
1908 | dlm_free_dead_locks(dlm, res, dead_node); | |
1909 | __dlm_lockres_calc_usage(dlm, res); | |
1910 | } | |
1911 | spin_unlock(&res->spinlock); | |
1912 | } | |
1913 | } | |
1914 | ||
1915 | } | |
1916 | ||
1917 | static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx) | |
1918 | { | |
1919 | assert_spin_locked(&dlm->spinlock); | |
1920 | ||
1921 | /* check to see if the node is already considered dead */ | |
1922 | if (!test_bit(idx, dlm->live_nodes_map)) { | |
1923 | mlog(0, "for domain %s, node %d is already dead. " | |
1924 | "another node likely did recovery already.\n", | |
1925 | dlm->name, idx); | |
1926 | return; | |
1927 | } | |
1928 | ||
1929 | /* check to see if we do not care about this node */ | |
1930 | if (!test_bit(idx, dlm->domain_map)) { | |
1931 | /* This also catches the case that we get a node down | |
1932 | * but haven't joined the domain yet. */ | |
1933 | mlog(0, "node %u already removed from domain!\n", idx); | |
1934 | return; | |
1935 | } | |
1936 | ||
1937 | clear_bit(idx, dlm->live_nodes_map); | |
1938 | ||
1939 | /* Clean up join state on node death. */ | |
1940 | if (dlm->joining_node == idx) { | |
1941 | mlog(0, "Clearing join state for node %u\n", idx); | |
1942 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); | |
1943 | } | |
1944 | ||
1945 | /* make sure local cleanup occurs before the heartbeat events */ | |
1946 | if (!test_bit(idx, dlm->recovery_map)) | |
1947 | dlm_do_local_recovery_cleanup(dlm, idx); | |
1948 | ||
1949 | /* notify anything attached to the heartbeat events */ | |
1950 | dlm_hb_event_notify_attached(dlm, idx, 0); | |
1951 | ||
1952 | mlog(0, "node %u being removed from domain map!\n", idx); | |
1953 | clear_bit(idx, dlm->domain_map); | |
1954 | /* wake up migration waiters if a node goes down. | |
1955 | * perhaps later we can genericize this for other waiters. */ | |
1956 | wake_up(&dlm->migration_wq); | |
1957 | ||
1958 | if (test_bit(idx, dlm->recovery_map)) | |
1959 | mlog(0, "domain %s, node %u already added " | |
1960 | "to recovery map!\n", dlm->name, idx); | |
1961 | else | |
1962 | set_bit(idx, dlm->recovery_map); | |
1963 | } | |
1964 | ||
1965 | void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data) | |
1966 | { | |
1967 | struct dlm_ctxt *dlm = data; | |
1968 | ||
1969 | if (!dlm_grab(dlm)) | |
1970 | return; | |
1971 | ||
1972 | spin_lock(&dlm->spinlock); | |
1973 | __dlm_hb_node_down(dlm, idx); | |
1974 | spin_unlock(&dlm->spinlock); | |
1975 | ||
1976 | dlm_put(dlm); | |
1977 | } | |
1978 | ||
1979 | void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data) | |
1980 | { | |
1981 | struct dlm_ctxt *dlm = data; | |
1982 | ||
1983 | if (!dlm_grab(dlm)) | |
1984 | return; | |
1985 | ||
1986 | spin_lock(&dlm->spinlock); | |
6714d8e8 | 1987 | set_bit(idx, dlm->live_nodes_map); |
e2faea4c KH |
1988 | /* do NOT notify mle attached to the heartbeat events. |
1989 | * new nodes are not interesting in mastery until joined. */ | |
6714d8e8 KH |
1990 | spin_unlock(&dlm->spinlock); |
1991 | ||
1992 | dlm_put(dlm); | |
1993 | } | |
1994 | ||
1995 | static void dlm_reco_ast(void *astdata) | |
1996 | { | |
1997 | struct dlm_ctxt *dlm = astdata; | |
1998 | mlog(0, "ast for recovery lock fired!, this=%u, dlm=%s\n", | |
1999 | dlm->node_num, dlm->name); | |
2000 | } | |
2001 | static void dlm_reco_bast(void *astdata, int blocked_type) | |
2002 | { | |
2003 | struct dlm_ctxt *dlm = astdata; | |
2004 | mlog(0, "bast for recovery lock fired!, this=%u, dlm=%s\n", | |
2005 | dlm->node_num, dlm->name); | |
2006 | } | |
2007 | static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st) | |
2008 | { | |
2009 | mlog(0, "unlockast for recovery lock fired!\n"); | |
2010 | } | |
2011 | ||
e2faea4c KH |
2012 | /* |
2013 | * dlm_pick_recovery_master will continually attempt to use | |
2014 | * dlmlock() on the special "$RECOVERY" lockres with the | |
2015 | * LKM_NOQUEUE flag to get an EX. every thread that enters | |
2016 | * this function on each node racing to become the recovery | |
2017 | * master will not stop attempting this until either: | |
2018 | * a) this node gets the EX (and becomes the recovery master), | |
2019 | * or b) dlm->reco.new_master gets set to some nodenum | |
2020 | * != O2NM_INVALID_NODE_NUM (another node will do the reco). | |
2021 | * so each time a recovery master is needed, the entire cluster | |
2022 | * will sync at this point. if the new master dies, that will | |
2023 | * be detected in dlm_do_recovery */ | |
6714d8e8 KH |
2024 | static int dlm_pick_recovery_master(struct dlm_ctxt *dlm) |
2025 | { | |
2026 | enum dlm_status ret; | |
2027 | struct dlm_lockstatus lksb; | |
2028 | int status = -EINVAL; | |
2029 | ||
2030 | mlog(0, "starting recovery of %s at %lu, dead=%u, this=%u\n", | |
2031 | dlm->name, jiffies, dlm->reco.dead_node, dlm->node_num); | |
e2faea4c | 2032 | again: |
6714d8e8 KH |
2033 | memset(&lksb, 0, sizeof(lksb)); |
2034 | ||
2035 | ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY, | |
2036 | DLM_RECOVERY_LOCK_NAME, dlm_reco_ast, dlm, dlm_reco_bast); | |
2037 | ||
e2faea4c KH |
2038 | mlog(0, "%s: dlmlock($RECOVERY) returned %d, lksb=%d\n", |
2039 | dlm->name, ret, lksb.status); | |
2040 | ||
6714d8e8 KH |
2041 | if (ret == DLM_NORMAL) { |
2042 | mlog(0, "dlm=%s dlmlock says I got it (this=%u)\n", | |
2043 | dlm->name, dlm->node_num); | |
e2faea4c KH |
2044 | |
2045 | /* got the EX lock. check to see if another node | |
2046 | * just became the reco master */ | |
2047 | if (dlm_reco_master_ready(dlm)) { | |
2048 | mlog(0, "%s: got reco EX lock, but %u will " | |
2049 | "do the recovery\n", dlm->name, | |
2050 | dlm->reco.new_master); | |
2051 | status = -EEXIST; | |
2052 | } else { | |
898effac KH |
2053 | status = 0; |
2054 | ||
2055 | /* see if recovery was already finished elsewhere */ | |
2056 | spin_lock(&dlm->spinlock); | |
2057 | if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) { | |
2058 | status = -EINVAL; | |
2059 | mlog(0, "%s: got reco EX lock, but " | |
2060 | "node got recovered already\n", dlm->name); | |
2061 | if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) { | |
2062 | mlog(ML_ERROR, "%s: new master is %u " | |
2063 | "but no dead node!\n", | |
2064 | dlm->name, dlm->reco.new_master); | |
2065 | BUG(); | |
2066 | } | |
2067 | } | |
2068 | spin_unlock(&dlm->spinlock); | |
2069 | } | |
2070 | ||
2071 | /* if this node has actually become the recovery master, | |
2072 | * set the master and send the messages to begin recovery */ | |
2073 | if (!status) { | |
2074 | mlog(0, "%s: dead=%u, this=%u, sending " | |
2075 | "begin_reco now\n", dlm->name, | |
2076 | dlm->reco.dead_node, dlm->node_num); | |
e2faea4c KH |
2077 | status = dlm_send_begin_reco_message(dlm, |
2078 | dlm->reco.dead_node); | |
2079 | /* this always succeeds */ | |
2080 | BUG_ON(status); | |
2081 | ||
2082 | /* set the new_master to this node */ | |
2083 | spin_lock(&dlm->spinlock); | |
2084 | dlm->reco.new_master = dlm->node_num; | |
2085 | spin_unlock(&dlm->spinlock); | |
2086 | } | |
6714d8e8 KH |
2087 | |
2088 | /* recovery lock is a special case. ast will not get fired, | |
2089 | * so just go ahead and unlock it. */ | |
2090 | ret = dlmunlock(dlm, &lksb, 0, dlm_reco_unlock_ast, dlm); | |
e2faea4c KH |
2091 | if (ret == DLM_DENIED) { |
2092 | mlog(0, "got DLM_DENIED, trying LKM_CANCEL\n"); | |
2093 | ret = dlmunlock(dlm, &lksb, LKM_CANCEL, dlm_reco_unlock_ast, dlm); | |
2094 | } | |
6714d8e8 KH |
2095 | if (ret != DLM_NORMAL) { |
2096 | /* this would really suck. this could only happen | |
2097 | * if there was a network error during the unlock | |
2098 | * because of node death. this means the unlock | |
2099 | * is actually "done" and the lock structure is | |
2100 | * even freed. we can continue, but only | |
2101 | * because this specific lock name is special. */ | |
e2faea4c | 2102 | mlog(ML_ERROR, "dlmunlock returned %d\n", ret); |
6714d8e8 KH |
2103 | } |
2104 | } else if (ret == DLM_NOTQUEUED) { | |
2105 | mlog(0, "dlm=%s dlmlock says another node got it (this=%u)\n", | |
2106 | dlm->name, dlm->node_num); | |
2107 | /* another node is master. wait on | |
e2faea4c KH |
2108 | * reco.new_master != O2NM_INVALID_NODE_NUM |
2109 | * for at most one second */ | |
2110 | wait_event_timeout(dlm->dlm_reco_thread_wq, | |
2111 | dlm_reco_master_ready(dlm), | |
2112 | msecs_to_jiffies(1000)); | |
2113 | if (!dlm_reco_master_ready(dlm)) { | |
2114 | mlog(0, "%s: reco master taking awhile\n", | |
2115 | dlm->name); | |
2116 | goto again; | |
2117 | } | |
2118 | /* another node has informed this one that it is reco master */ | |
2119 | mlog(0, "%s: reco master %u is ready to recover %u\n", | |
2120 | dlm->name, dlm->reco.new_master, dlm->reco.dead_node); | |
6714d8e8 | 2121 | status = -EEXIST; |
e2faea4c KH |
2122 | } else { |
2123 | struct dlm_lock_resource *res; | |
2124 | ||
2125 | /* dlmlock returned something other than NOTQUEUED or NORMAL */ | |
2126 | mlog(ML_ERROR, "%s: got %s from dlmlock($RECOVERY), " | |
2127 | "lksb.status=%s\n", dlm->name, dlm_errname(ret), | |
2128 | dlm_errname(lksb.status)); | |
2129 | res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME, | |
2130 | DLM_RECOVERY_LOCK_NAME_LEN); | |
2131 | if (res) { | |
2132 | dlm_print_one_lock_resource(res); | |
2133 | dlm_lockres_put(res); | |
2134 | } else { | |
2135 | mlog(ML_ERROR, "recovery lock not found\n"); | |
2136 | } | |
2137 | BUG(); | |
6714d8e8 KH |
2138 | } |
2139 | ||
2140 | return status; | |
2141 | } | |
2142 | ||
2143 | static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node) | |
2144 | { | |
2145 | struct dlm_begin_reco br; | |
2146 | int ret = 0; | |
2147 | struct dlm_node_iter iter; | |
2148 | int nodenum; | |
2149 | int status; | |
2150 | ||
2151 | mlog_entry("%u\n", dead_node); | |
2152 | ||
2153 | mlog(0, "dead node is %u\n", dead_node); | |
2154 | ||
2155 | spin_lock(&dlm->spinlock); | |
2156 | dlm_node_iter_init(dlm->domain_map, &iter); | |
2157 | spin_unlock(&dlm->spinlock); | |
2158 | ||
2159 | clear_bit(dead_node, iter.node_map); | |
2160 | ||
2161 | memset(&br, 0, sizeof(br)); | |
2162 | br.node_idx = dlm->node_num; | |
2163 | br.dead_node = dead_node; | |
2164 | ||
2165 | while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { | |
2166 | ret = 0; | |
2167 | if (nodenum == dead_node) { | |
2168 | mlog(0, "not sending begin reco to dead node " | |
2169 | "%u\n", dead_node); | |
2170 | continue; | |
2171 | } | |
2172 | if (nodenum == dlm->node_num) { | |
2173 | mlog(0, "not sending begin reco to self\n"); | |
2174 | continue; | |
2175 | } | |
e2faea4c | 2176 | retry: |
6714d8e8 KH |
2177 | ret = -EINVAL; |
2178 | mlog(0, "attempting to send begin reco msg to %d\n", | |
2179 | nodenum); | |
2180 | ret = o2net_send_message(DLM_BEGIN_RECO_MSG, dlm->key, | |
2181 | &br, sizeof(br), nodenum, &status); | |
2182 | /* negative status is handled ok by caller here */ | |
2183 | if (ret >= 0) | |
2184 | ret = status; | |
e2faea4c KH |
2185 | if (dlm_is_host_down(ret)) { |
2186 | /* node is down. not involved in recovery | |
2187 | * so just keep going */ | |
2188 | mlog(0, "%s: node %u was down when sending " | |
2189 | "begin reco msg (%d)\n", dlm->name, nodenum, ret); | |
2190 | ret = 0; | |
2191 | } | |
6714d8e8 KH |
2192 | if (ret < 0) { |
2193 | struct dlm_lock_resource *res; | |
e2faea4c KH |
2194 | /* this is now a serious problem, possibly ENOMEM |
2195 | * in the network stack. must retry */ | |
6714d8e8 KH |
2196 | mlog_errno(ret); |
2197 | mlog(ML_ERROR, "begin reco of dlm %s to node %u " | |
2198 | " returned %d\n", dlm->name, nodenum, ret); | |
2199 | res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME, | |
2200 | DLM_RECOVERY_LOCK_NAME_LEN); | |
2201 | if (res) { | |
2202 | dlm_print_one_lock_resource(res); | |
2203 | dlm_lockres_put(res); | |
2204 | } else { | |
2205 | mlog(ML_ERROR, "recovery lock not found\n"); | |
2206 | } | |
e2faea4c KH |
2207 | /* sleep for a bit in hopes that we can avoid |
2208 | * another ENOMEM */ | |
2209 | msleep(100); | |
2210 | goto retry; | |
6714d8e8 KH |
2211 | } |
2212 | } | |
2213 | ||
2214 | return ret; | |
2215 | } | |
2216 | ||
2217 | int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data) | |
2218 | { | |
2219 | struct dlm_ctxt *dlm = data; | |
2220 | struct dlm_begin_reco *br = (struct dlm_begin_reco *)msg->buf; | |
2221 | ||
2222 | /* ok to return 0, domain has gone away */ | |
2223 | if (!dlm_grab(dlm)) | |
2224 | return 0; | |
2225 | ||
2226 | mlog(0, "node %u wants to recover node %u\n", | |
2227 | br->node_idx, br->dead_node); | |
2228 | ||
2229 | dlm_fire_domain_eviction_callbacks(dlm, br->dead_node); | |
2230 | ||
2231 | spin_lock(&dlm->spinlock); | |
2232 | if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) { | |
e2faea4c KH |
2233 | if (test_bit(dlm->reco.new_master, dlm->recovery_map)) { |
2234 | mlog(0, "%s: new_master %u died, changing " | |
2235 | "to %u\n", dlm->name, dlm->reco.new_master, | |
2236 | br->node_idx); | |
2237 | } else { | |
2238 | mlog(0, "%s: new_master %u NOT DEAD, changing " | |
2239 | "to %u\n", dlm->name, dlm->reco.new_master, | |
2240 | br->node_idx); | |
2241 | /* may not have seen the new master as dead yet */ | |
2242 | } | |
6714d8e8 KH |
2243 | } |
2244 | if (dlm->reco.dead_node != O2NM_INVALID_NODE_NUM) { | |
e2faea4c KH |
2245 | mlog(ML_NOTICE, "%s: dead_node previously set to %u, " |
2246 | "node %u changing it to %u\n", dlm->name, | |
2247 | dlm->reco.dead_node, br->node_idx, br->dead_node); | |
6714d8e8 KH |
2248 | } |
2249 | dlm->reco.new_master = br->node_idx; | |
2250 | dlm->reco.dead_node = br->dead_node; | |
2251 | if (!test_bit(br->dead_node, dlm->recovery_map)) { | |
e2faea4c | 2252 | mlog(0, "recovery master %u sees %u as dead, but this " |
6714d8e8 KH |
2253 | "node has not yet. marking %u as dead\n", |
2254 | br->node_idx, br->dead_node, br->dead_node); | |
e2faea4c KH |
2255 | if (!test_bit(br->dead_node, dlm->domain_map) || |
2256 | !test_bit(br->dead_node, dlm->live_nodes_map)) | |
2257 | mlog(0, "%u not in domain/live_nodes map " | |
2258 | "so setting it in reco map manually\n", | |
2259 | br->dead_node); | |
2260 | set_bit(br->dead_node, dlm->recovery_map); | |
6714d8e8 KH |
2261 | __dlm_hb_node_down(dlm, br->dead_node); |
2262 | } | |
2263 | spin_unlock(&dlm->spinlock); | |
2264 | ||
2265 | dlm_kick_recovery_thread(dlm); | |
2266 | dlm_put(dlm); | |
2267 | return 0; | |
2268 | } | |
2269 | ||
2270 | static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm) | |
2271 | { | |
2272 | int ret = 0; | |
2273 | struct dlm_finalize_reco fr; | |
2274 | struct dlm_node_iter iter; | |
2275 | int nodenum; | |
2276 | int status; | |
2277 | ||
2278 | mlog(0, "finishing recovery for node %s:%u\n", | |
2279 | dlm->name, dlm->reco.dead_node); | |
2280 | ||
2281 | spin_lock(&dlm->spinlock); | |
2282 | dlm_node_iter_init(dlm->domain_map, &iter); | |
2283 | spin_unlock(&dlm->spinlock); | |
2284 | ||
2285 | memset(&fr, 0, sizeof(fr)); | |
2286 | fr.node_idx = dlm->node_num; | |
2287 | fr.dead_node = dlm->reco.dead_node; | |
2288 | ||
2289 | while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { | |
2290 | if (nodenum == dlm->node_num) | |
2291 | continue; | |
2292 | ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key, | |
2293 | &fr, sizeof(fr), nodenum, &status); | |
2294 | if (ret >= 0) { | |
2295 | ret = status; | |
2296 | if (dlm_is_host_down(ret)) { | |
2297 | /* this has no effect on this recovery | |
2298 | * session, so set the status to zero to | |
2299 | * finish out the last recovery */ | |
2300 | mlog(ML_ERROR, "node %u went down after this " | |
2301 | "node finished recovery.\n", nodenum); | |
2302 | ret = 0; | |
2303 | } | |
2304 | } | |
2305 | if (ret < 0) { | |
2306 | mlog_errno(ret); | |
2307 | break; | |
2308 | } | |
2309 | } | |
2310 | ||
2311 | return ret; | |
2312 | } | |
2313 | ||
2314 | int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data) | |
2315 | { | |
2316 | struct dlm_ctxt *dlm = data; | |
2317 | struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf; | |
2318 | ||
2319 | /* ok to return 0, domain has gone away */ | |
2320 | if (!dlm_grab(dlm)) | |
2321 | return 0; | |
2322 | ||
2323 | mlog(0, "node %u finalizing recovery of node %u\n", | |
2324 | fr->node_idx, fr->dead_node); | |
2325 | ||
2326 | spin_lock(&dlm->spinlock); | |
2327 | ||
2328 | if (dlm->reco.new_master != fr->node_idx) { | |
2329 | mlog(ML_ERROR, "node %u sent recovery finalize msg, but node " | |
2330 | "%u is supposed to be the new master, dead=%u\n", | |
2331 | fr->node_idx, dlm->reco.new_master, fr->dead_node); | |
2332 | BUG(); | |
2333 | } | |
2334 | if (dlm->reco.dead_node != fr->dead_node) { | |
2335 | mlog(ML_ERROR, "node %u sent recovery finalize msg for dead " | |
2336 | "node %u, but node %u is supposed to be dead\n", | |
2337 | fr->node_idx, fr->dead_node, dlm->reco.dead_node); | |
2338 | BUG(); | |
2339 | } | |
2340 | ||
2341 | dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx); | |
2342 | ||
2343 | spin_unlock(&dlm->spinlock); | |
2344 | ||
2345 | dlm_reset_recovery(dlm); | |
2346 | ||
2347 | dlm_kick_recovery_thread(dlm); | |
2348 | dlm_put(dlm); | |
2349 | return 0; | |
2350 | } |