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