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6714d8e8 KH |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * dlmthread.c | |
5 | * | |
6 | * standalone DLM module | |
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> | |
6714d8e8 | 31 | #include <linux/highmem.h> |
6714d8e8 KH |
32 | #include <linux/init.h> |
33 | #include <linux/sysctl.h> | |
34 | #include <linux/random.h> | |
35 | #include <linux/blkdev.h> | |
36 | #include <linux/socket.h> | |
37 | #include <linux/inet.h> | |
38 | #include <linux/timer.h> | |
39 | #include <linux/kthread.h> | |
8d79d088 | 40 | #include <linux/delay.h> |
6714d8e8 KH |
41 | |
42 | ||
43 | #include "cluster/heartbeat.h" | |
44 | #include "cluster/nodemanager.h" | |
45 | #include "cluster/tcp.h" | |
46 | ||
47 | #include "dlmapi.h" | |
48 | #include "dlmcommon.h" | |
49 | #include "dlmdomain.h" | |
50 | ||
51 | #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_THREAD) | |
52 | #include "cluster/masklog.h" | |
53 | ||
6714d8e8 | 54 | static int dlm_thread(void *data); |
6714d8e8 KH |
55 | static void dlm_flush_asts(struct dlm_ctxt *dlm); |
56 | ||
57 | #define dlm_lock_is_remote(dlm, lock) ((lock)->ml.node != (dlm)->node_num) | |
58 | ||
59 | /* will exit holding res->spinlock, but may drop in function */ | |
60 | /* waits until flags are cleared on res->state */ | |
61 | void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags) | |
62 | { | |
63 | DECLARE_WAITQUEUE(wait, current); | |
64 | ||
65 | assert_spin_locked(&res->spinlock); | |
66 | ||
67 | add_wait_queue(&res->wq, &wait); | |
68 | repeat: | |
69 | set_current_state(TASK_UNINTERRUPTIBLE); | |
70 | if (res->state & flags) { | |
71 | spin_unlock(&res->spinlock); | |
72 | schedule(); | |
73 | spin_lock(&res->spinlock); | |
74 | goto repeat; | |
75 | } | |
76 | remove_wait_queue(&res->wq, &wait); | |
5c2c9d38 | 77 | __set_current_state(TASK_RUNNING); |
6714d8e8 KH |
78 | } |
79 | ||
ba2bf218 | 80 | int __dlm_lockres_has_locks(struct dlm_lock_resource *res) |
6714d8e8 KH |
81 | { |
82 | if (list_empty(&res->granted) && | |
83 | list_empty(&res->converting) && | |
ba2bf218 KH |
84 | list_empty(&res->blocked)) |
85 | return 0; | |
86 | return 1; | |
87 | } | |
88 | ||
89 | /* "unused": the lockres has no locks, is not on the dirty list, | |
90 | * has no inflight locks (in the gap between mastery and acquiring | |
91 | * the first lock), and has no bits in its refmap. | |
92 | * truly ready to be freed. */ | |
93 | int __dlm_lockres_unused(struct dlm_lock_resource *res) | |
94 | { | |
a524812b WW |
95 | int bit; |
96 | ||
ff0a522e SM |
97 | assert_spin_locked(&res->spinlock); |
98 | ||
a524812b WW |
99 | if (__dlm_lockres_has_locks(res)) |
100 | return 0; | |
101 | ||
ff0a522e SM |
102 | /* Locks are in the process of being created */ |
103 | if (res->inflight_locks) | |
104 | return 0; | |
105 | ||
a524812b WW |
106 | if (!list_empty(&res->dirty) || res->state & DLM_LOCK_RES_DIRTY) |
107 | return 0; | |
108 | ||
109 | if (res->state & DLM_LOCK_RES_RECOVERING) | |
110 | return 0; | |
111 | ||
ff0a522e | 112 | /* Another node has this resource with this node as the master */ |
a524812b WW |
113 | bit = find_next_bit(res->refmap, O2NM_MAX_NODES, 0); |
114 | if (bit < O2NM_MAX_NODES) | |
115 | return 0; | |
116 | ||
a524812b | 117 | return 1; |
6714d8e8 KH |
118 | } |
119 | ||
120 | ||
121 | /* Call whenever you may have added or deleted something from one of | |
122 | * the lockres queue's. This will figure out whether it belongs on the | |
123 | * unused list or not and does the appropriate thing. */ | |
124 | void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm, | |
125 | struct dlm_lock_resource *res) | |
126 | { | |
6714d8e8 KH |
127 | assert_spin_locked(&dlm->spinlock); |
128 | assert_spin_locked(&res->spinlock); | |
129 | ||
130 | if (__dlm_lockres_unused(res)){ | |
131 | if (list_empty(&res->purge)) { | |
8e17d16f SM |
132 | mlog(0, "%s: Adding res %.*s to purge list\n", |
133 | dlm->name, res->lockname.len, res->lockname.name); | |
6714d8e8 KH |
134 | |
135 | res->last_used = jiffies; | |
ba2bf218 | 136 | dlm_lockres_get(res); |
6714d8e8 KH |
137 | list_add_tail(&res->purge, &dlm->purge_list); |
138 | dlm->purge_count++; | |
139 | } | |
140 | } else if (!list_empty(&res->purge)) { | |
8e17d16f SM |
141 | mlog(0, "%s: Removing res %.*s from purge list\n", |
142 | dlm->name, res->lockname.len, res->lockname.name); | |
6714d8e8 KH |
143 | |
144 | list_del_init(&res->purge); | |
ba2bf218 | 145 | dlm_lockres_put(res); |
6714d8e8 KH |
146 | dlm->purge_count--; |
147 | } | |
148 | } | |
149 | ||
150 | void dlm_lockres_calc_usage(struct dlm_ctxt *dlm, | |
151 | struct dlm_lock_resource *res) | |
152 | { | |
6714d8e8 KH |
153 | spin_lock(&dlm->spinlock); |
154 | spin_lock(&res->spinlock); | |
155 | ||
156 | __dlm_lockres_calc_usage(dlm, res); | |
157 | ||
158 | spin_unlock(&res->spinlock); | |
159 | spin_unlock(&dlm->spinlock); | |
160 | } | |
161 | ||
7beaf243 | 162 | static void dlm_purge_lockres(struct dlm_ctxt *dlm, |
faf0ec9f | 163 | struct dlm_lock_resource *res) |
6714d8e8 KH |
164 | { |
165 | int master; | |
ba2bf218 | 166 | int ret = 0; |
6714d8e8 | 167 | |
7beaf243 SE |
168 | assert_spin_locked(&dlm->spinlock); |
169 | assert_spin_locked(&res->spinlock); | |
516b7e52 | 170 | |
ba2bf218 | 171 | master = (res->owner == dlm->node_num); |
516b7e52 | 172 | |
8e17d16f SM |
173 | mlog(0, "%s: Purging res %.*s, master %d\n", dlm->name, |
174 | res->lockname.len, res->lockname.name, master); | |
ba2bf218 KH |
175 | |
176 | if (!master) { | |
7beaf243 | 177 | res->state |= DLM_LOCK_RES_DROPPING_REF; |
c824c3c7 | 178 | /* drop spinlock... retake below */ |
7beaf243 | 179 | spin_unlock(&res->spinlock); |
c824c3c7 SM |
180 | spin_unlock(&dlm->spinlock); |
181 | ||
3b8118cf KH |
182 | spin_lock(&res->spinlock); |
183 | /* This ensures that clear refmap is sent after the set */ | |
7dc102b7 | 184 | __dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG); |
3b8118cf | 185 | spin_unlock(&res->spinlock); |
c824c3c7 | 186 | |
ba2bf218 KH |
187 | /* clear our bit from the master's refmap, ignore errors */ |
188 | ret = dlm_drop_lockres_ref(dlm, res); | |
189 | if (ret < 0) { | |
ba2bf218 KH |
190 | if (!dlm_is_host_down(ret)) |
191 | BUG(); | |
192 | } | |
ba2bf218 | 193 | spin_lock(&dlm->spinlock); |
7beaf243 | 194 | spin_lock(&res->spinlock); |
6714d8e8 KH |
195 | } |
196 | ||
ba2bf218 | 197 | if (!list_empty(&res->purge)) { |
8e17d16f SM |
198 | mlog(0, "%s: Removing res %.*s from purgelist, master %d\n", |
199 | dlm->name, res->lockname.len, res->lockname.name, master); | |
ba2bf218 KH |
200 | list_del_init(&res->purge); |
201 | dlm_lockres_put(res); | |
6714d8e8 | 202 | dlm->purge_count--; |
7beaf243 SE |
203 | } |
204 | ||
205 | if (!__dlm_lockres_unused(res)) { | |
8e17d16f | 206 | mlog(ML_ERROR, "%s: res %.*s in use after deref\n", |
7beaf243 SE |
207 | dlm->name, res->lockname.len, res->lockname.name); |
208 | __dlm_print_one_lock_resource(res); | |
209 | BUG(); | |
210 | } | |
83e32d90 | 211 | |
e9f0b6a6 | 212 | __dlm_unhash_lockres(dlm, res); |
6714d8e8 | 213 | |
ba2bf218 KH |
214 | /* lockres is not in the hash now. drop the flag and wake up |
215 | * any processes waiting in dlm_get_lock_resource. */ | |
216 | if (!master) { | |
ba2bf218 KH |
217 | res->state &= ~DLM_LOCK_RES_DROPPING_REF; |
218 | spin_unlock(&res->spinlock); | |
219 | wake_up(&res->wq); | |
7beaf243 SE |
220 | } else |
221 | spin_unlock(&res->spinlock); | |
8b219809 KH |
222 | } |
223 | ||
6714d8e8 KH |
224 | static void dlm_run_purge_list(struct dlm_ctxt *dlm, |
225 | int purge_now) | |
226 | { | |
227 | unsigned int run_max, unused; | |
228 | unsigned long purge_jiffies; | |
229 | struct dlm_lock_resource *lockres; | |
230 | ||
231 | spin_lock(&dlm->spinlock); | |
232 | run_max = dlm->purge_count; | |
233 | ||
234 | while(run_max && !list_empty(&dlm->purge_list)) { | |
235 | run_max--; | |
236 | ||
237 | lockres = list_entry(dlm->purge_list.next, | |
238 | struct dlm_lock_resource, purge); | |
239 | ||
6714d8e8 | 240 | spin_lock(&lockres->spinlock); |
6714d8e8 KH |
241 | |
242 | purge_jiffies = lockres->last_used + | |
243 | msecs_to_jiffies(DLM_PURGE_INTERVAL_MS); | |
244 | ||
245 | /* Make sure that we want to be processing this guy at | |
246 | * this time. */ | |
247 | if (!purge_now && time_after(purge_jiffies, jiffies)) { | |
248 | /* Since resources are added to the purge list | |
249 | * in tail order, we can stop at the first | |
250 | * unpurgable resource -- anyone added after | |
251 | * him will have a greater last_used value */ | |
7beaf243 | 252 | spin_unlock(&lockres->spinlock); |
6714d8e8 KH |
253 | break; |
254 | } | |
255 | ||
7beaf243 SE |
256 | /* Status of the lockres *might* change so double |
257 | * check. If the lockres is unused, holding the dlm | |
258 | * spinlock will prevent people from getting and more | |
259 | * refs on it. */ | |
260 | unused = __dlm_lockres_unused(lockres); | |
261 | if (!unused || | |
ac4fef4d X |
262 | (lockres->state & DLM_LOCK_RES_MIGRATING) || |
263 | (lockres->inflight_assert_workers != 0)) { | |
8e17d16f | 264 | mlog(0, "%s: res %.*s is in use or being remastered, " |
ac4fef4d X |
265 | "used %d, state %d, assert master workers %u\n", |
266 | dlm->name, lockres->lockname.len, | |
267 | lockres->lockname.name, | |
268 | !unused, lockres->state, | |
269 | lockres->inflight_assert_workers); | |
a270c6d3 | 270 | list_move_tail(&lockres->purge, &dlm->purge_list); |
7beaf243 SE |
271 | spin_unlock(&lockres->spinlock); |
272 | continue; | |
273 | } | |
274 | ||
78062cb2 | 275 | dlm_lockres_get(lockres); |
6714d8e8 | 276 | |
7beaf243 | 277 | dlm_purge_lockres(dlm, lockres); |
78062cb2 | 278 | |
3fca0894 | 279 | dlm_lockres_put(lockres); |
6714d8e8 KH |
280 | |
281 | /* Avoid adding any scheduling latencies */ | |
282 | cond_resched_lock(&dlm->spinlock); | |
283 | } | |
284 | ||
285 | spin_unlock(&dlm->spinlock); | |
286 | } | |
287 | ||
288 | static void dlm_shuffle_lists(struct dlm_ctxt *dlm, | |
289 | struct dlm_lock_resource *res) | |
290 | { | |
291 | struct dlm_lock *lock, *target; | |
6714d8e8 KH |
292 | int can_grant = 1; |
293 | ||
8e17d16f SM |
294 | /* |
295 | * Because this function is called with the lockres | |
6714d8e8 KH |
296 | * spinlock, and because we know that it is not migrating/ |
297 | * recovering/in-progress, it is fine to reserve asts and | |
8e17d16f SM |
298 | * basts right before queueing them all throughout |
299 | */ | |
d9ef7522 | 300 | assert_spin_locked(&dlm->ast_lock); |
6714d8e8 KH |
301 | assert_spin_locked(&res->spinlock); |
302 | BUG_ON((res->state & (DLM_LOCK_RES_MIGRATING| | |
303 | DLM_LOCK_RES_RECOVERING| | |
304 | DLM_LOCK_RES_IN_PROGRESS))); | |
305 | ||
306 | converting: | |
307 | if (list_empty(&res->converting)) | |
308 | goto blocked; | |
8e17d16f SM |
309 | mlog(0, "%s: res %.*s has locks on the convert queue\n", dlm->name, |
310 | res->lockname.len, res->lockname.name); | |
6714d8e8 KH |
311 | |
312 | target = list_entry(res->converting.next, struct dlm_lock, list); | |
313 | if (target->ml.convert_type == LKM_IVMODE) { | |
8e17d16f SM |
314 | mlog(ML_ERROR, "%s: res %.*s converting lock to invalid mode\n", |
315 | dlm->name, res->lockname.len, res->lockname.name); | |
6714d8e8 KH |
316 | BUG(); |
317 | } | |
df53cd3b | 318 | list_for_each_entry(lock, &res->granted, list) { |
6714d8e8 KH |
319 | if (lock==target) |
320 | continue; | |
321 | if (!dlm_lock_compatible(lock->ml.type, | |
322 | target->ml.convert_type)) { | |
323 | can_grant = 0; | |
324 | /* queue the BAST if not already */ | |
325 | if (lock->ml.highest_blocked == LKM_IVMODE) { | |
326 | __dlm_lockres_reserve_ast(res); | |
d9ef7522 | 327 | __dlm_queue_bast(dlm, lock); |
6714d8e8 KH |
328 | } |
329 | /* update the highest_blocked if needed */ | |
330 | if (lock->ml.highest_blocked < target->ml.convert_type) | |
331 | lock->ml.highest_blocked = | |
332 | target->ml.convert_type; | |
333 | } | |
334 | } | |
df53cd3b DF |
335 | |
336 | list_for_each_entry(lock, &res->converting, list) { | |
6714d8e8 KH |
337 | if (lock==target) |
338 | continue; | |
339 | if (!dlm_lock_compatible(lock->ml.type, | |
340 | target->ml.convert_type)) { | |
341 | can_grant = 0; | |
342 | if (lock->ml.highest_blocked == LKM_IVMODE) { | |
343 | __dlm_lockres_reserve_ast(res); | |
d9ef7522 | 344 | __dlm_queue_bast(dlm, lock); |
6714d8e8 KH |
345 | } |
346 | if (lock->ml.highest_blocked < target->ml.convert_type) | |
347 | lock->ml.highest_blocked = | |
348 | target->ml.convert_type; | |
349 | } | |
350 | } | |
351 | ||
352 | /* we can convert the lock */ | |
353 | if (can_grant) { | |
354 | spin_lock(&target->spinlock); | |
355 | BUG_ON(target->ml.highest_blocked != LKM_IVMODE); | |
356 | ||
8e17d16f SM |
357 | mlog(0, "%s: res %.*s, AST for Converting lock %u:%llu, type " |
358 | "%d => %d, node %u\n", dlm->name, res->lockname.len, | |
359 | res->lockname.name, | |
360 | dlm_get_lock_cookie_node(be64_to_cpu(target->ml.cookie)), | |
361 | dlm_get_lock_cookie_seq(be64_to_cpu(target->ml.cookie)), | |
362 | target->ml.type, | |
6714d8e8 KH |
363 | target->ml.convert_type, target->ml.node); |
364 | ||
365 | target->ml.type = target->ml.convert_type; | |
366 | target->ml.convert_type = LKM_IVMODE; | |
f116629d | 367 | list_move_tail(&target->list, &res->granted); |
6714d8e8 KH |
368 | |
369 | BUG_ON(!target->lksb); | |
370 | target->lksb->status = DLM_NORMAL; | |
371 | ||
372 | spin_unlock(&target->spinlock); | |
373 | ||
374 | __dlm_lockres_reserve_ast(res); | |
d9ef7522 | 375 | __dlm_queue_ast(dlm, target); |
6714d8e8 KH |
376 | /* go back and check for more */ |
377 | goto converting; | |
378 | } | |
379 | ||
380 | blocked: | |
381 | if (list_empty(&res->blocked)) | |
382 | goto leave; | |
383 | target = list_entry(res->blocked.next, struct dlm_lock, list); | |
384 | ||
df53cd3b | 385 | list_for_each_entry(lock, &res->granted, list) { |
6714d8e8 KH |
386 | if (lock==target) |
387 | continue; | |
388 | if (!dlm_lock_compatible(lock->ml.type, target->ml.type)) { | |
389 | can_grant = 0; | |
390 | if (lock->ml.highest_blocked == LKM_IVMODE) { | |
391 | __dlm_lockres_reserve_ast(res); | |
d9ef7522 | 392 | __dlm_queue_bast(dlm, lock); |
6714d8e8 KH |
393 | } |
394 | if (lock->ml.highest_blocked < target->ml.type) | |
395 | lock->ml.highest_blocked = target->ml.type; | |
396 | } | |
397 | } | |
398 | ||
df53cd3b | 399 | list_for_each_entry(lock, &res->converting, list) { |
6714d8e8 KH |
400 | if (lock==target) |
401 | continue; | |
402 | if (!dlm_lock_compatible(lock->ml.type, target->ml.type)) { | |
403 | can_grant = 0; | |
404 | if (lock->ml.highest_blocked == LKM_IVMODE) { | |
405 | __dlm_lockres_reserve_ast(res); | |
d9ef7522 | 406 | __dlm_queue_bast(dlm, lock); |
6714d8e8 KH |
407 | } |
408 | if (lock->ml.highest_blocked < target->ml.type) | |
409 | lock->ml.highest_blocked = target->ml.type; | |
410 | } | |
411 | } | |
412 | ||
413 | /* we can grant the blocked lock (only | |
414 | * possible if converting list empty) */ | |
415 | if (can_grant) { | |
416 | spin_lock(&target->spinlock); | |
417 | BUG_ON(target->ml.highest_blocked != LKM_IVMODE); | |
418 | ||
8e17d16f SM |
419 | mlog(0, "%s: res %.*s, AST for Blocked lock %u:%llu, type %d, " |
420 | "node %u\n", dlm->name, res->lockname.len, | |
421 | res->lockname.name, | |
422 | dlm_get_lock_cookie_node(be64_to_cpu(target->ml.cookie)), | |
423 | dlm_get_lock_cookie_seq(be64_to_cpu(target->ml.cookie)), | |
6714d8e8 KH |
424 | target->ml.type, target->ml.node); |
425 | ||
8e17d16f | 426 | /* target->ml.type is already correct */ |
f116629d | 427 | list_move_tail(&target->list, &res->granted); |
6714d8e8 KH |
428 | |
429 | BUG_ON(!target->lksb); | |
430 | target->lksb->status = DLM_NORMAL; | |
431 | ||
432 | spin_unlock(&target->spinlock); | |
433 | ||
434 | __dlm_lockres_reserve_ast(res); | |
d9ef7522 | 435 | __dlm_queue_ast(dlm, target); |
6714d8e8 KH |
436 | /* go back and check for more */ |
437 | goto converting; | |
438 | } | |
439 | ||
440 | leave: | |
441 | return; | |
442 | } | |
443 | ||
444 | /* must have NO locks when calling this with res !=NULL * */ | |
445 | void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) | |
446 | { | |
6714d8e8 KH |
447 | if (res) { |
448 | spin_lock(&dlm->spinlock); | |
449 | spin_lock(&res->spinlock); | |
450 | __dlm_dirty_lockres(dlm, res); | |
451 | spin_unlock(&res->spinlock); | |
452 | spin_unlock(&dlm->spinlock); | |
453 | } | |
454 | wake_up(&dlm->dlm_thread_wq); | |
455 | } | |
456 | ||
457 | void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) | |
458 | { | |
6714d8e8 KH |
459 | assert_spin_locked(&dlm->spinlock); |
460 | assert_spin_locked(&res->spinlock); | |
461 | ||
462 | /* don't shuffle secondary queues */ | |
ddc09c8d KH |
463 | if ((res->owner == dlm->node_num)) { |
464 | if (res->state & (DLM_LOCK_RES_MIGRATING | | |
465 | DLM_LOCK_RES_BLOCK_DIRTY)) | |
466 | return; | |
467 | ||
468 | if (list_empty(&res->dirty)) { | |
469 | /* ref for dirty_list */ | |
470 | dlm_lockres_get(res); | |
471 | list_add_tail(&res->dirty, &dlm->dirty_list); | |
472 | res->state |= DLM_LOCK_RES_DIRTY; | |
473 | } | |
6714d8e8 | 474 | } |
8e17d16f SM |
475 | |
476 | mlog(0, "%s: res %.*s\n", dlm->name, res->lockname.len, | |
477 | res->lockname.name); | |
6714d8e8 KH |
478 | } |
479 | ||
480 | ||
481 | /* Launch the NM thread for the mounted volume */ | |
482 | int dlm_launch_thread(struct dlm_ctxt *dlm) | |
483 | { | |
8e17d16f | 484 | mlog(0, "Starting dlm_thread...\n"); |
6714d8e8 KH |
485 | |
486 | dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm_thread"); | |
487 | if (IS_ERR(dlm->dlm_thread_task)) { | |
488 | mlog_errno(PTR_ERR(dlm->dlm_thread_task)); | |
489 | dlm->dlm_thread_task = NULL; | |
490 | return -EINVAL; | |
491 | } | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
496 | void dlm_complete_thread(struct dlm_ctxt *dlm) | |
497 | { | |
498 | if (dlm->dlm_thread_task) { | |
8e17d16f | 499 | mlog(ML_KTHREAD, "Waiting for dlm thread to exit\n"); |
6714d8e8 KH |
500 | kthread_stop(dlm->dlm_thread_task); |
501 | dlm->dlm_thread_task = NULL; | |
502 | } | |
503 | } | |
504 | ||
505 | static int dlm_dirty_list_empty(struct dlm_ctxt *dlm) | |
506 | { | |
507 | int empty; | |
508 | ||
509 | spin_lock(&dlm->spinlock); | |
510 | empty = list_empty(&dlm->dirty_list); | |
511 | spin_unlock(&dlm->spinlock); | |
512 | ||
513 | return empty; | |
514 | } | |
515 | ||
516 | static void dlm_flush_asts(struct dlm_ctxt *dlm) | |
517 | { | |
518 | int ret; | |
519 | struct dlm_lock *lock; | |
520 | struct dlm_lock_resource *res; | |
521 | u8 hi; | |
522 | ||
523 | spin_lock(&dlm->ast_lock); | |
524 | while (!list_empty(&dlm->pending_asts)) { | |
525 | lock = list_entry(dlm->pending_asts.next, | |
526 | struct dlm_lock, ast_list); | |
527 | /* get an extra ref on lock */ | |
528 | dlm_lock_get(lock); | |
529 | res = lock->lockres; | |
8e17d16f SM |
530 | mlog(0, "%s: res %.*s, Flush AST for lock %u:%llu, type %d, " |
531 | "node %u\n", dlm->name, res->lockname.len, | |
532 | res->lockname.name, | |
533 | dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), | |
534 | dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), | |
535 | lock->ml.type, lock->ml.node); | |
6714d8e8 KH |
536 | |
537 | BUG_ON(!lock->ast_pending); | |
538 | ||
539 | /* remove from list (including ref) */ | |
540 | list_del_init(&lock->ast_list); | |
541 | dlm_lock_put(lock); | |
542 | spin_unlock(&dlm->ast_lock); | |
543 | ||
544 | if (lock->ml.node != dlm->node_num) { | |
545 | ret = dlm_do_remote_ast(dlm, res, lock); | |
546 | if (ret < 0) | |
547 | mlog_errno(ret); | |
548 | } else | |
549 | dlm_do_local_ast(dlm, res, lock); | |
550 | ||
551 | spin_lock(&dlm->ast_lock); | |
552 | ||
553 | /* possible that another ast was queued while | |
554 | * we were delivering the last one */ | |
555 | if (!list_empty(&lock->ast_list)) { | |
8e17d16f SM |
556 | mlog(0, "%s: res %.*s, AST queued while flushing last " |
557 | "one\n", dlm->name, res->lockname.len, | |
558 | res->lockname.name); | |
6714d8e8 KH |
559 | } else |
560 | lock->ast_pending = 0; | |
561 | ||
562 | /* drop the extra ref. | |
563 | * this may drop it completely. */ | |
564 | dlm_lock_put(lock); | |
565 | dlm_lockres_release_ast(dlm, res); | |
566 | } | |
567 | ||
568 | while (!list_empty(&dlm->pending_basts)) { | |
569 | lock = list_entry(dlm->pending_basts.next, | |
570 | struct dlm_lock, bast_list); | |
571 | /* get an extra ref on lock */ | |
572 | dlm_lock_get(lock); | |
573 | res = lock->lockres; | |
574 | ||
575 | BUG_ON(!lock->bast_pending); | |
576 | ||
577 | /* get the highest blocked lock, and reset */ | |
578 | spin_lock(&lock->spinlock); | |
579 | BUG_ON(lock->ml.highest_blocked <= LKM_IVMODE); | |
580 | hi = lock->ml.highest_blocked; | |
581 | lock->ml.highest_blocked = LKM_IVMODE; | |
582 | spin_unlock(&lock->spinlock); | |
583 | ||
584 | /* remove from list (including ref) */ | |
585 | list_del_init(&lock->bast_list); | |
586 | dlm_lock_put(lock); | |
587 | spin_unlock(&dlm->ast_lock); | |
588 | ||
8e17d16f SM |
589 | mlog(0, "%s: res %.*s, Flush BAST for lock %u:%llu, " |
590 | "blocked %d, node %u\n", | |
591 | dlm->name, res->lockname.len, res->lockname.name, | |
592 | dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), | |
593 | dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), | |
594 | hi, lock->ml.node); | |
6714d8e8 KH |
595 | |
596 | if (lock->ml.node != dlm->node_num) { | |
597 | ret = dlm_send_proxy_bast(dlm, res, lock, hi); | |
598 | if (ret < 0) | |
599 | mlog_errno(ret); | |
600 | } else | |
601 | dlm_do_local_bast(dlm, res, lock, hi); | |
602 | ||
603 | spin_lock(&dlm->ast_lock); | |
604 | ||
605 | /* possible that another bast was queued while | |
606 | * we were delivering the last one */ | |
607 | if (!list_empty(&lock->bast_list)) { | |
8e17d16f SM |
608 | mlog(0, "%s: res %.*s, BAST queued while flushing last " |
609 | "one\n", dlm->name, res->lockname.len, | |
610 | res->lockname.name); | |
6714d8e8 KH |
611 | } else |
612 | lock->bast_pending = 0; | |
613 | ||
614 | /* drop the extra ref. | |
615 | * this may drop it completely. */ | |
616 | dlm_lock_put(lock); | |
617 | dlm_lockres_release_ast(dlm, res); | |
618 | } | |
619 | wake_up(&dlm->ast_wq); | |
620 | spin_unlock(&dlm->ast_lock); | |
621 | } | |
622 | ||
623 | ||
624 | #define DLM_THREAD_TIMEOUT_MS (4 * 1000) | |
625 | #define DLM_THREAD_MAX_DIRTY 100 | |
626 | #define DLM_THREAD_MAX_ASTS 10 | |
627 | ||
628 | static int dlm_thread(void *data) | |
629 | { | |
630 | struct dlm_lock_resource *res; | |
631 | struct dlm_ctxt *dlm = data; | |
632 | unsigned long timeout = msecs_to_jiffies(DLM_THREAD_TIMEOUT_MS); | |
633 | ||
634 | mlog(0, "dlm thread running for %s...\n", dlm->name); | |
635 | ||
636 | while (!kthread_should_stop()) { | |
637 | int n = DLM_THREAD_MAX_DIRTY; | |
638 | ||
639 | /* dlm_shutting_down is very point-in-time, but that | |
640 | * doesn't matter as we'll just loop back around if we | |
641 | * get false on the leading edge of a state | |
642 | * transition. */ | |
643 | dlm_run_purge_list(dlm, dlm_shutting_down(dlm)); | |
644 | ||
645 | /* We really don't want to hold dlm->spinlock while | |
646 | * calling dlm_shuffle_lists on each lockres that | |
647 | * needs to have its queues adjusted and AST/BASTs | |
648 | * run. So let's pull each entry off the dirty_list | |
649 | * and drop dlm->spinlock ASAP. Once off the list, | |
650 | * res->spinlock needs to be taken again to protect | |
651 | * the queues while calling dlm_shuffle_lists. */ | |
652 | spin_lock(&dlm->spinlock); | |
653 | while (!list_empty(&dlm->dirty_list)) { | |
654 | int delay = 0; | |
655 | res = list_entry(dlm->dirty_list.next, | |
656 | struct dlm_lock_resource, dirty); | |
657 | ||
658 | /* peel a lockres off, remove it from the list, | |
659 | * unset the dirty flag and drop the dlm lock */ | |
660 | BUG_ON(!res); | |
661 | dlm_lockres_get(res); | |
662 | ||
663 | spin_lock(&res->spinlock); | |
ddc09c8d | 664 | /* We clear the DLM_LOCK_RES_DIRTY state once we shuffle lists below */ |
6714d8e8 KH |
665 | list_del_init(&res->dirty); |
666 | spin_unlock(&res->spinlock); | |
667 | spin_unlock(&dlm->spinlock); | |
6ff06a93 KH |
668 | /* Drop dirty_list ref */ |
669 | dlm_lockres_put(res); | |
6714d8e8 KH |
670 | |
671 | /* lockres can be re-dirtied/re-added to the | |
672 | * dirty_list in this gap, but that is ok */ | |
673 | ||
d9ef7522 | 674 | spin_lock(&dlm->ast_lock); |
6714d8e8 KH |
675 | spin_lock(&res->spinlock); |
676 | if (res->owner != dlm->node_num) { | |
677 | __dlm_print_one_lock_resource(res); | |
8e17d16f SM |
678 | mlog(ML_ERROR, "%s: inprog %d, mig %d, reco %d," |
679 | " dirty %d\n", dlm->name, | |
680 | !!(res->state & DLM_LOCK_RES_IN_PROGRESS), | |
681 | !!(res->state & DLM_LOCK_RES_MIGRATING), | |
682 | !!(res->state & DLM_LOCK_RES_RECOVERING), | |
683 | !!(res->state & DLM_LOCK_RES_DIRTY)); | |
6714d8e8 KH |
684 | } |
685 | BUG_ON(res->owner != dlm->node_num); | |
686 | ||
687 | /* it is now ok to move lockreses in these states | |
688 | * to the dirty list, assuming that they will only be | |
689 | * dirty for a short while. */ | |
ddc09c8d | 690 | BUG_ON(res->state & DLM_LOCK_RES_MIGRATING); |
6714d8e8 | 691 | if (res->state & (DLM_LOCK_RES_IN_PROGRESS | |
6714d8e8 KH |
692 | DLM_LOCK_RES_RECOVERING)) { |
693 | /* move it to the tail and keep going */ | |
ddc09c8d | 694 | res->state &= ~DLM_LOCK_RES_DIRTY; |
6714d8e8 | 695 | spin_unlock(&res->spinlock); |
d9ef7522 | 696 | spin_unlock(&dlm->ast_lock); |
8e17d16f SM |
697 | mlog(0, "%s: res %.*s, inprogress, delay list " |
698 | "shuffle, state %d\n", dlm->name, | |
6714d8e8 KH |
699 | res->lockname.len, res->lockname.name, |
700 | res->state); | |
701 | delay = 1; | |
702 | goto in_progress; | |
703 | } | |
704 | ||
705 | /* at this point the lockres is not migrating/ | |
706 | * recovering/in-progress. we have the lockres | |
707 | * spinlock and do NOT have the dlm lock. | |
708 | * safe to reserve/queue asts and run the lists. */ | |
709 | ||
6714d8e8 KH |
710 | /* called while holding lockres lock */ |
711 | dlm_shuffle_lists(dlm, res); | |
ddc09c8d | 712 | res->state &= ~DLM_LOCK_RES_DIRTY; |
6714d8e8 | 713 | spin_unlock(&res->spinlock); |
d9ef7522 | 714 | spin_unlock(&dlm->ast_lock); |
6714d8e8 KH |
715 | |
716 | dlm_lockres_calc_usage(dlm, res); | |
717 | ||
718 | in_progress: | |
719 | ||
720 | spin_lock(&dlm->spinlock); | |
721 | /* if the lock was in-progress, stick | |
722 | * it on the back of the list */ | |
723 | if (delay) { | |
724 | spin_lock(&res->spinlock); | |
ddc09c8d | 725 | __dlm_dirty_lockres(dlm, res); |
6714d8e8 KH |
726 | spin_unlock(&res->spinlock); |
727 | } | |
728 | dlm_lockres_put(res); | |
729 | ||
730 | /* unlikely, but we may need to give time to | |
731 | * other tasks */ | |
732 | if (!--n) { | |
8e17d16f SM |
733 | mlog(0, "%s: Throttling dlm thread\n", |
734 | dlm->name); | |
6714d8e8 KH |
735 | break; |
736 | } | |
737 | } | |
738 | ||
739 | spin_unlock(&dlm->spinlock); | |
740 | dlm_flush_asts(dlm); | |
741 | ||
742 | /* yield and continue right away if there is more work to do */ | |
743 | if (!n) { | |
f85cd47a | 744 | cond_resched(); |
6714d8e8 KH |
745 | continue; |
746 | } | |
747 | ||
748 | wait_event_interruptible_timeout(dlm->dlm_thread_wq, | |
749 | !dlm_dirty_list_empty(dlm) || | |
750 | kthread_should_stop(), | |
751 | timeout); | |
752 | } | |
753 | ||
754 | mlog(0, "quitting DLM thread\n"); | |
755 | return 0; | |
756 | } |