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Commit | Line | Data |
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e7fd4179 DT |
1 | /****************************************************************************** |
2 | ******************************************************************************* | |
3 | ** | |
4 | ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
5 | ** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. | |
6 | ** | |
7 | ** This copyrighted material is made available to anyone wishing to use, | |
8 | ** modify, copy, or redistribute it subject to the terms and conditions | |
9 | ** of the GNU General Public License v.2. | |
10 | ** | |
11 | ******************************************************************************* | |
12 | ******************************************************************************/ | |
13 | ||
14 | #include "dlm_internal.h" | |
15 | #include "lockspace.h" | |
16 | #include "member.h" | |
17 | #include "recoverd.h" | |
18 | #include "ast.h" | |
19 | #include "dir.h" | |
20 | #include "lowcomms.h" | |
21 | #include "config.h" | |
22 | #include "memory.h" | |
23 | #include "lock.h" | |
c56b39cd | 24 | #include "recover.h" |
e7fd4179 DT |
25 | |
26 | #ifdef CONFIG_DLM_DEBUG | |
27 | int dlm_create_debug_file(struct dlm_ls *ls); | |
28 | void dlm_delete_debug_file(struct dlm_ls *ls); | |
29 | #else | |
30 | static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; } | |
31 | static inline void dlm_delete_debug_file(struct dlm_ls *ls) { } | |
32 | #endif | |
33 | ||
34 | static int ls_count; | |
90135925 | 35 | static struct mutex ls_lock; |
e7fd4179 DT |
36 | static struct list_head lslist; |
37 | static spinlock_t lslist_lock; | |
38 | static struct task_struct * scand_task; | |
39 | ||
40 | ||
41 | static ssize_t dlm_control_store(struct dlm_ls *ls, const char *buf, size_t len) | |
42 | { | |
43 | ssize_t ret = len; | |
44 | int n = simple_strtol(buf, NULL, 0); | |
45 | ||
e2de7f56 PC |
46 | ls = dlm_find_lockspace_local(ls->ls_local_handle); |
47 | if (!ls) | |
48 | return -EINVAL; | |
49 | ||
e7fd4179 DT |
50 | switch (n) { |
51 | case 0: | |
52 | dlm_ls_stop(ls); | |
53 | break; | |
54 | case 1: | |
55 | dlm_ls_start(ls); | |
56 | break; | |
57 | default: | |
58 | ret = -EINVAL; | |
59 | } | |
e2de7f56 | 60 | dlm_put_lockspace(ls); |
e7fd4179 DT |
61 | return ret; |
62 | } | |
63 | ||
64 | static ssize_t dlm_event_store(struct dlm_ls *ls, const char *buf, size_t len) | |
65 | { | |
66 | ls->ls_uevent_result = simple_strtol(buf, NULL, 0); | |
67 | set_bit(LSFL_UEVENT_WAIT, &ls->ls_flags); | |
68 | wake_up(&ls->ls_uevent_wait); | |
69 | return len; | |
70 | } | |
71 | ||
72 | static ssize_t dlm_id_show(struct dlm_ls *ls, char *buf) | |
73 | { | |
a1d144c7 | 74 | return snprintf(buf, PAGE_SIZE, "%u\n", ls->ls_global_id); |
e7fd4179 DT |
75 | } |
76 | ||
77 | static ssize_t dlm_id_store(struct dlm_ls *ls, const char *buf, size_t len) | |
78 | { | |
79 | ls->ls_global_id = simple_strtoul(buf, NULL, 0); | |
80 | return len; | |
81 | } | |
82 | ||
c56b39cd DT |
83 | static ssize_t dlm_recover_status_show(struct dlm_ls *ls, char *buf) |
84 | { | |
85 | uint32_t status = dlm_recover_status(ls); | |
a1d144c7 | 86 | return snprintf(buf, PAGE_SIZE, "%x\n", status); |
c56b39cd DT |
87 | } |
88 | ||
faa0f267 DT |
89 | static ssize_t dlm_recover_nodeid_show(struct dlm_ls *ls, char *buf) |
90 | { | |
a1d144c7 | 91 | return snprintf(buf, PAGE_SIZE, "%d\n", ls->ls_recover_nodeid); |
faa0f267 DT |
92 | } |
93 | ||
e7fd4179 DT |
94 | struct dlm_attr { |
95 | struct attribute attr; | |
96 | ssize_t (*show)(struct dlm_ls *, char *); | |
97 | ssize_t (*store)(struct dlm_ls *, const char *, size_t); | |
98 | }; | |
99 | ||
100 | static struct dlm_attr dlm_attr_control = { | |
101 | .attr = {.name = "control", .mode = S_IWUSR}, | |
102 | .store = dlm_control_store | |
103 | }; | |
104 | ||
105 | static struct dlm_attr dlm_attr_event = { | |
106 | .attr = {.name = "event_done", .mode = S_IWUSR}, | |
107 | .store = dlm_event_store | |
108 | }; | |
109 | ||
110 | static struct dlm_attr dlm_attr_id = { | |
111 | .attr = {.name = "id", .mode = S_IRUGO | S_IWUSR}, | |
112 | .show = dlm_id_show, | |
113 | .store = dlm_id_store | |
114 | }; | |
115 | ||
c56b39cd DT |
116 | static struct dlm_attr dlm_attr_recover_status = { |
117 | .attr = {.name = "recover_status", .mode = S_IRUGO}, | |
118 | .show = dlm_recover_status_show | |
119 | }; | |
120 | ||
faa0f267 DT |
121 | static struct dlm_attr dlm_attr_recover_nodeid = { |
122 | .attr = {.name = "recover_nodeid", .mode = S_IRUGO}, | |
123 | .show = dlm_recover_nodeid_show | |
124 | }; | |
125 | ||
e7fd4179 DT |
126 | static struct attribute *dlm_attrs[] = { |
127 | &dlm_attr_control.attr, | |
128 | &dlm_attr_event.attr, | |
129 | &dlm_attr_id.attr, | |
c56b39cd | 130 | &dlm_attr_recover_status.attr, |
faa0f267 | 131 | &dlm_attr_recover_nodeid.attr, |
e7fd4179 DT |
132 | NULL, |
133 | }; | |
134 | ||
135 | static ssize_t dlm_attr_show(struct kobject *kobj, struct attribute *attr, | |
136 | char *buf) | |
137 | { | |
138 | struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj); | |
139 | struct dlm_attr *a = container_of(attr, struct dlm_attr, attr); | |
140 | return a->show ? a->show(ls, buf) : 0; | |
141 | } | |
142 | ||
143 | static ssize_t dlm_attr_store(struct kobject *kobj, struct attribute *attr, | |
144 | const char *buf, size_t len) | |
145 | { | |
146 | struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj); | |
147 | struct dlm_attr *a = container_of(attr, struct dlm_attr, attr); | |
148 | return a->store ? a->store(ls, buf, len) : len; | |
149 | } | |
150 | ||
ba542e3b PC |
151 | static void lockspace_kobj_release(struct kobject *k) |
152 | { | |
153 | struct dlm_ls *ls = container_of(k, struct dlm_ls, ls_kobj); | |
154 | kfree(ls); | |
155 | } | |
156 | ||
e7fd4179 DT |
157 | static struct sysfs_ops dlm_attr_ops = { |
158 | .show = dlm_attr_show, | |
159 | .store = dlm_attr_store, | |
160 | }; | |
161 | ||
162 | static struct kobj_type dlm_ktype = { | |
163 | .default_attrs = dlm_attrs, | |
164 | .sysfs_ops = &dlm_attr_ops, | |
ba542e3b | 165 | .release = lockspace_kobj_release, |
e7fd4179 DT |
166 | }; |
167 | ||
168 | static struct kset dlm_kset = { | |
169 | .subsys = &kernel_subsys, | |
170 | .kobj = {.name = "dlm",}, | |
171 | .ktype = &dlm_ktype, | |
172 | }; | |
173 | ||
174 | static int kobject_setup(struct dlm_ls *ls) | |
175 | { | |
176 | char lsname[DLM_LOCKSPACE_LEN]; | |
177 | int error; | |
178 | ||
179 | memset(lsname, 0, DLM_LOCKSPACE_LEN); | |
180 | snprintf(lsname, DLM_LOCKSPACE_LEN, "%s", ls->ls_name); | |
181 | ||
182 | error = kobject_set_name(&ls->ls_kobj, "%s", lsname); | |
183 | if (error) | |
184 | return error; | |
185 | ||
186 | ls->ls_kobj.kset = &dlm_kset; | |
187 | ls->ls_kobj.ktype = &dlm_ktype; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int do_uevent(struct dlm_ls *ls, int in) | |
192 | { | |
193 | int error; | |
194 | ||
195 | if (in) | |
196 | kobject_uevent(&ls->ls_kobj, KOBJ_ONLINE); | |
197 | else | |
198 | kobject_uevent(&ls->ls_kobj, KOBJ_OFFLINE); | |
199 | ||
200 | error = wait_event_interruptible(ls->ls_uevent_wait, | |
201 | test_and_clear_bit(LSFL_UEVENT_WAIT, &ls->ls_flags)); | |
202 | if (error) | |
203 | goto out; | |
204 | ||
205 | error = ls->ls_uevent_result; | |
206 | out: | |
207 | return error; | |
208 | } | |
209 | ||
210 | ||
211 | int dlm_lockspace_init(void) | |
212 | { | |
213 | int error; | |
214 | ||
215 | ls_count = 0; | |
90135925 | 216 | mutex_init(&ls_lock); |
e7fd4179 DT |
217 | INIT_LIST_HEAD(&lslist); |
218 | spin_lock_init(&lslist_lock); | |
219 | ||
220 | error = kset_register(&dlm_kset); | |
221 | if (error) | |
222 | printk("dlm_lockspace_init: cannot register kset %d\n", error); | |
223 | return error; | |
224 | } | |
225 | ||
226 | void dlm_lockspace_exit(void) | |
227 | { | |
228 | kset_unregister(&dlm_kset); | |
229 | } | |
230 | ||
231 | static int dlm_scand(void *data) | |
232 | { | |
233 | struct dlm_ls *ls; | |
234 | ||
235 | while (!kthread_should_stop()) { | |
236 | list_for_each_entry(ls, &lslist, ls_list) | |
237 | dlm_scan_rsbs(ls); | |
238 | schedule_timeout_interruptible(dlm_config.scan_secs * HZ); | |
239 | } | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static int dlm_scand_start(void) | |
244 | { | |
245 | struct task_struct *p; | |
246 | int error = 0; | |
247 | ||
248 | p = kthread_run(dlm_scand, NULL, "dlm_scand"); | |
249 | if (IS_ERR(p)) | |
250 | error = PTR_ERR(p); | |
251 | else | |
252 | scand_task = p; | |
253 | return error; | |
254 | } | |
255 | ||
256 | static void dlm_scand_stop(void) | |
257 | { | |
258 | kthread_stop(scand_task); | |
259 | } | |
260 | ||
261 | static struct dlm_ls *dlm_find_lockspace_name(char *name, int namelen) | |
262 | { | |
263 | struct dlm_ls *ls; | |
264 | ||
265 | spin_lock(&lslist_lock); | |
266 | ||
267 | list_for_each_entry(ls, &lslist, ls_list) { | |
268 | if (ls->ls_namelen == namelen && | |
269 | memcmp(ls->ls_name, name, namelen) == 0) | |
270 | goto out; | |
271 | } | |
272 | ls = NULL; | |
273 | out: | |
274 | spin_unlock(&lslist_lock); | |
275 | return ls; | |
276 | } | |
277 | ||
278 | struct dlm_ls *dlm_find_lockspace_global(uint32_t id) | |
279 | { | |
280 | struct dlm_ls *ls; | |
281 | ||
282 | spin_lock(&lslist_lock); | |
283 | ||
284 | list_for_each_entry(ls, &lslist, ls_list) { | |
285 | if (ls->ls_global_id == id) { | |
286 | ls->ls_count++; | |
287 | goto out; | |
288 | } | |
289 | } | |
290 | ls = NULL; | |
291 | out: | |
292 | spin_unlock(&lslist_lock); | |
293 | return ls; | |
294 | } | |
295 | ||
597d0cae | 296 | struct dlm_ls *dlm_find_lockspace_local(dlm_lockspace_t *lockspace) |
e7fd4179 | 297 | { |
597d0cae | 298 | struct dlm_ls *ls; |
e7fd4179 DT |
299 | |
300 | spin_lock(&lslist_lock); | |
597d0cae DT |
301 | list_for_each_entry(ls, &lslist, ls_list) { |
302 | if (ls->ls_local_handle == lockspace) { | |
303 | ls->ls_count++; | |
304 | goto out; | |
305 | } | |
306 | } | |
307 | ls = NULL; | |
308 | out: | |
309 | spin_unlock(&lslist_lock); | |
310 | return ls; | |
311 | } | |
312 | ||
313 | struct dlm_ls *dlm_find_lockspace_device(int minor) | |
314 | { | |
315 | struct dlm_ls *ls; | |
316 | ||
317 | spin_lock(&lslist_lock); | |
318 | list_for_each_entry(ls, &lslist, ls_list) { | |
319 | if (ls->ls_device.minor == minor) { | |
320 | ls->ls_count++; | |
321 | goto out; | |
322 | } | |
323 | } | |
324 | ls = NULL; | |
325 | out: | |
e7fd4179 DT |
326 | spin_unlock(&lslist_lock); |
327 | return ls; | |
328 | } | |
329 | ||
330 | void dlm_put_lockspace(struct dlm_ls *ls) | |
331 | { | |
332 | spin_lock(&lslist_lock); | |
333 | ls->ls_count--; | |
334 | spin_unlock(&lslist_lock); | |
335 | } | |
336 | ||
337 | static void remove_lockspace(struct dlm_ls *ls) | |
338 | { | |
339 | for (;;) { | |
340 | spin_lock(&lslist_lock); | |
341 | if (ls->ls_count == 0) { | |
342 | list_del(&ls->ls_list); | |
343 | spin_unlock(&lslist_lock); | |
344 | return; | |
345 | } | |
346 | spin_unlock(&lslist_lock); | |
347 | ssleep(1); | |
348 | } | |
349 | } | |
350 | ||
351 | static int threads_start(void) | |
352 | { | |
353 | int error; | |
354 | ||
355 | /* Thread which process lock requests for all lockspace's */ | |
356 | error = dlm_astd_start(); | |
357 | if (error) { | |
358 | log_print("cannot start dlm_astd thread %d", error); | |
359 | goto fail; | |
360 | } | |
361 | ||
362 | error = dlm_scand_start(); | |
363 | if (error) { | |
364 | log_print("cannot start dlm_scand thread %d", error); | |
365 | goto astd_fail; | |
366 | } | |
367 | ||
368 | /* Thread for sending/receiving messages for all lockspace's */ | |
369 | error = dlm_lowcomms_start(); | |
370 | if (error) { | |
371 | log_print("cannot start dlm lowcomms %d", error); | |
372 | goto scand_fail; | |
373 | } | |
374 | ||
375 | return 0; | |
376 | ||
377 | scand_fail: | |
378 | dlm_scand_stop(); | |
379 | astd_fail: | |
380 | dlm_astd_stop(); | |
381 | fail: | |
382 | return error; | |
383 | } | |
384 | ||
385 | static void threads_stop(void) | |
386 | { | |
387 | dlm_scand_stop(); | |
388 | dlm_lowcomms_stop(); | |
389 | dlm_astd_stop(); | |
390 | } | |
391 | ||
392 | static int new_lockspace(char *name, int namelen, void **lockspace, | |
393 | uint32_t flags, int lvblen) | |
394 | { | |
395 | struct dlm_ls *ls; | |
396 | int i, size, error = -ENOMEM; | |
397 | ||
398 | if (namelen > DLM_LOCKSPACE_LEN) | |
399 | return -EINVAL; | |
400 | ||
401 | if (!lvblen || (lvblen % 8)) | |
402 | return -EINVAL; | |
403 | ||
404 | if (!try_module_get(THIS_MODULE)) | |
405 | return -EINVAL; | |
406 | ||
407 | ls = dlm_find_lockspace_name(name, namelen); | |
408 | if (ls) { | |
409 | *lockspace = ls; | |
410 | module_put(THIS_MODULE); | |
411 | return -EEXIST; | |
412 | } | |
413 | ||
90135925 | 414 | ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_KERNEL); |
e7fd4179 DT |
415 | if (!ls) |
416 | goto out; | |
e7fd4179 DT |
417 | memcpy(ls->ls_name, name, namelen); |
418 | ls->ls_namelen = namelen; | |
419 | ls->ls_exflags = flags; | |
420 | ls->ls_lvblen = lvblen; | |
421 | ls->ls_count = 0; | |
422 | ls->ls_flags = 0; | |
423 | ||
424 | size = dlm_config.rsbtbl_size; | |
425 | ls->ls_rsbtbl_size = size; | |
426 | ||
427 | ls->ls_rsbtbl = kmalloc(sizeof(struct dlm_rsbtable) * size, GFP_KERNEL); | |
428 | if (!ls->ls_rsbtbl) | |
429 | goto out_lsfree; | |
430 | for (i = 0; i < size; i++) { | |
431 | INIT_LIST_HEAD(&ls->ls_rsbtbl[i].list); | |
432 | INIT_LIST_HEAD(&ls->ls_rsbtbl[i].toss); | |
433 | rwlock_init(&ls->ls_rsbtbl[i].lock); | |
434 | } | |
435 | ||
436 | size = dlm_config.lkbtbl_size; | |
437 | ls->ls_lkbtbl_size = size; | |
438 | ||
439 | ls->ls_lkbtbl = kmalloc(sizeof(struct dlm_lkbtable) * size, GFP_KERNEL); | |
440 | if (!ls->ls_lkbtbl) | |
441 | goto out_rsbfree; | |
442 | for (i = 0; i < size; i++) { | |
443 | INIT_LIST_HEAD(&ls->ls_lkbtbl[i].list); | |
444 | rwlock_init(&ls->ls_lkbtbl[i].lock); | |
445 | ls->ls_lkbtbl[i].counter = 1; | |
446 | } | |
447 | ||
448 | size = dlm_config.dirtbl_size; | |
449 | ls->ls_dirtbl_size = size; | |
450 | ||
451 | ls->ls_dirtbl = kmalloc(sizeof(struct dlm_dirtable) * size, GFP_KERNEL); | |
452 | if (!ls->ls_dirtbl) | |
453 | goto out_lkbfree; | |
454 | for (i = 0; i < size; i++) { | |
455 | INIT_LIST_HEAD(&ls->ls_dirtbl[i].list); | |
456 | rwlock_init(&ls->ls_dirtbl[i].lock); | |
457 | } | |
458 | ||
459 | INIT_LIST_HEAD(&ls->ls_waiters); | |
90135925 | 460 | mutex_init(&ls->ls_waiters_mutex); |
e7fd4179 DT |
461 | |
462 | INIT_LIST_HEAD(&ls->ls_nodes); | |
463 | INIT_LIST_HEAD(&ls->ls_nodes_gone); | |
464 | ls->ls_num_nodes = 0; | |
465 | ls->ls_low_nodeid = 0; | |
466 | ls->ls_total_weight = 0; | |
467 | ls->ls_node_array = NULL; | |
468 | ||
469 | memset(&ls->ls_stub_rsb, 0, sizeof(struct dlm_rsb)); | |
470 | ls->ls_stub_rsb.res_ls = ls; | |
471 | ||
5de6319b DT |
472 | ls->ls_debug_rsb_dentry = NULL; |
473 | ls->ls_debug_waiters_dentry = NULL; | |
e7fd4179 DT |
474 | |
475 | init_waitqueue_head(&ls->ls_uevent_wait); | |
476 | ls->ls_uevent_result = 0; | |
477 | ||
478 | ls->ls_recoverd_task = NULL; | |
90135925 | 479 | mutex_init(&ls->ls_recoverd_active); |
e7fd4179 DT |
480 | spin_lock_init(&ls->ls_recover_lock); |
481 | ls->ls_recover_status = 0; | |
482 | ls->ls_recover_seq = 0; | |
483 | ls->ls_recover_args = NULL; | |
484 | init_rwsem(&ls->ls_in_recovery); | |
485 | INIT_LIST_HEAD(&ls->ls_requestqueue); | |
90135925 | 486 | mutex_init(&ls->ls_requestqueue_mutex); |
597d0cae | 487 | mutex_init(&ls->ls_clear_proc_locks); |
e7fd4179 DT |
488 | |
489 | ls->ls_recover_buf = kmalloc(dlm_config.buffer_size, GFP_KERNEL); | |
490 | if (!ls->ls_recover_buf) | |
491 | goto out_dirfree; | |
492 | ||
493 | INIT_LIST_HEAD(&ls->ls_recover_list); | |
494 | spin_lock_init(&ls->ls_recover_list_lock); | |
495 | ls->ls_recover_list_count = 0; | |
597d0cae | 496 | ls->ls_local_handle = ls; |
e7fd4179 DT |
497 | init_waitqueue_head(&ls->ls_wait_general); |
498 | INIT_LIST_HEAD(&ls->ls_root_list); | |
499 | init_rwsem(&ls->ls_root_sem); | |
500 | ||
501 | down_write(&ls->ls_in_recovery); | |
502 | ||
5f88f1ea DT |
503 | spin_lock(&lslist_lock); |
504 | list_add(&ls->ls_list, &lslist); | |
505 | spin_unlock(&lslist_lock); | |
506 | ||
507 | /* needs to find ls in lslist */ | |
e7fd4179 DT |
508 | error = dlm_recoverd_start(ls); |
509 | if (error) { | |
510 | log_error(ls, "can't start dlm_recoverd %d", error); | |
511 | goto out_rcomfree; | |
512 | } | |
513 | ||
e7fd4179 DT |
514 | dlm_create_debug_file(ls); |
515 | ||
516 | error = kobject_setup(ls); | |
517 | if (error) | |
518 | goto out_del; | |
519 | ||
520 | error = kobject_register(&ls->ls_kobj); | |
521 | if (error) | |
522 | goto out_del; | |
523 | ||
524 | error = do_uevent(ls, 1); | |
525 | if (error) | |
526 | goto out_unreg; | |
527 | ||
528 | *lockspace = ls; | |
529 | return 0; | |
530 | ||
531 | out_unreg: | |
532 | kobject_unregister(&ls->ls_kobj); | |
533 | out_del: | |
534 | dlm_delete_debug_file(ls); | |
5f88f1ea DT |
535 | dlm_recoverd_stop(ls); |
536 | out_rcomfree: | |
e7fd4179 DT |
537 | spin_lock(&lslist_lock); |
538 | list_del(&ls->ls_list); | |
539 | spin_unlock(&lslist_lock); | |
e7fd4179 DT |
540 | kfree(ls->ls_recover_buf); |
541 | out_dirfree: | |
542 | kfree(ls->ls_dirtbl); | |
543 | out_lkbfree: | |
544 | kfree(ls->ls_lkbtbl); | |
545 | out_rsbfree: | |
546 | kfree(ls->ls_rsbtbl); | |
547 | out_lsfree: | |
548 | kfree(ls); | |
549 | out: | |
550 | module_put(THIS_MODULE); | |
551 | return error; | |
552 | } | |
553 | ||
554 | int dlm_new_lockspace(char *name, int namelen, void **lockspace, | |
555 | uint32_t flags, int lvblen) | |
556 | { | |
557 | int error = 0; | |
558 | ||
90135925 | 559 | mutex_lock(&ls_lock); |
e7fd4179 DT |
560 | if (!ls_count) |
561 | error = threads_start(); | |
562 | if (error) | |
563 | goto out; | |
564 | ||
565 | error = new_lockspace(name, namelen, lockspace, flags, lvblen); | |
566 | if (!error) | |
567 | ls_count++; | |
568 | out: | |
90135925 | 569 | mutex_unlock(&ls_lock); |
e7fd4179 DT |
570 | return error; |
571 | } | |
572 | ||
573 | /* Return 1 if the lockspace still has active remote locks, | |
574 | * 2 if the lockspace still has active local locks. | |
575 | */ | |
576 | static int lockspace_busy(struct dlm_ls *ls) | |
577 | { | |
578 | int i, lkb_found = 0; | |
579 | struct dlm_lkb *lkb; | |
580 | ||
581 | /* NOTE: We check the lockidtbl here rather than the resource table. | |
582 | This is because there may be LKBs queued as ASTs that have been | |
583 | unlinked from their RSBs and are pending deletion once the AST has | |
584 | been delivered */ | |
585 | ||
586 | for (i = 0; i < ls->ls_lkbtbl_size; i++) { | |
587 | read_lock(&ls->ls_lkbtbl[i].lock); | |
588 | if (!list_empty(&ls->ls_lkbtbl[i].list)) { | |
589 | lkb_found = 1; | |
590 | list_for_each_entry(lkb, &ls->ls_lkbtbl[i].list, | |
591 | lkb_idtbl_list) { | |
592 | if (!lkb->lkb_nodeid) { | |
593 | read_unlock(&ls->ls_lkbtbl[i].lock); | |
594 | return 2; | |
595 | } | |
596 | } | |
597 | } | |
598 | read_unlock(&ls->ls_lkbtbl[i].lock); | |
599 | } | |
600 | return lkb_found; | |
601 | } | |
602 | ||
603 | static int release_lockspace(struct dlm_ls *ls, int force) | |
604 | { | |
605 | struct dlm_lkb *lkb; | |
606 | struct dlm_rsb *rsb; | |
607 | struct list_head *head; | |
608 | int i; | |
609 | int busy = lockspace_busy(ls); | |
610 | ||
611 | if (busy > force) | |
612 | return -EBUSY; | |
613 | ||
614 | if (force < 3) | |
615 | do_uevent(ls, 0); | |
616 | ||
617 | dlm_recoverd_stop(ls); | |
618 | ||
619 | remove_lockspace(ls); | |
620 | ||
621 | dlm_delete_debug_file(ls); | |
622 | ||
623 | dlm_astd_suspend(); | |
624 | ||
625 | kfree(ls->ls_recover_buf); | |
626 | ||
627 | /* | |
628 | * Free direntry structs. | |
629 | */ | |
630 | ||
631 | dlm_dir_clear(ls); | |
632 | kfree(ls->ls_dirtbl); | |
633 | ||
634 | /* | |
635 | * Free all lkb's on lkbtbl[] lists. | |
636 | */ | |
637 | ||
638 | for (i = 0; i < ls->ls_lkbtbl_size; i++) { | |
639 | head = &ls->ls_lkbtbl[i].list; | |
640 | while (!list_empty(head)) { | |
641 | lkb = list_entry(head->next, struct dlm_lkb, | |
642 | lkb_idtbl_list); | |
643 | ||
644 | list_del(&lkb->lkb_idtbl_list); | |
645 | ||
646 | dlm_del_ast(lkb); | |
647 | ||
648 | if (lkb->lkb_lvbptr && lkb->lkb_flags & DLM_IFL_MSTCPY) | |
649 | free_lvb(lkb->lkb_lvbptr); | |
650 | ||
651 | free_lkb(lkb); | |
652 | } | |
653 | } | |
654 | dlm_astd_resume(); | |
655 | ||
656 | kfree(ls->ls_lkbtbl); | |
657 | ||
658 | /* | |
659 | * Free all rsb's on rsbtbl[] lists | |
660 | */ | |
661 | ||
662 | for (i = 0; i < ls->ls_rsbtbl_size; i++) { | |
663 | head = &ls->ls_rsbtbl[i].list; | |
664 | while (!list_empty(head)) { | |
665 | rsb = list_entry(head->next, struct dlm_rsb, | |
666 | res_hashchain); | |
667 | ||
668 | list_del(&rsb->res_hashchain); | |
669 | free_rsb(rsb); | |
670 | } | |
671 | ||
672 | head = &ls->ls_rsbtbl[i].toss; | |
673 | while (!list_empty(head)) { | |
674 | rsb = list_entry(head->next, struct dlm_rsb, | |
675 | res_hashchain); | |
676 | list_del(&rsb->res_hashchain); | |
677 | free_rsb(rsb); | |
678 | } | |
679 | } | |
680 | ||
681 | kfree(ls->ls_rsbtbl); | |
682 | ||
683 | /* | |
684 | * Free structures on any other lists | |
685 | */ | |
686 | ||
687 | kfree(ls->ls_recover_args); | |
688 | dlm_clear_free_entries(ls); | |
689 | dlm_clear_members(ls); | |
690 | dlm_clear_members_gone(ls); | |
691 | kfree(ls->ls_node_array); | |
692 | kobject_unregister(&ls->ls_kobj); | |
ba542e3b | 693 | /* The ls structure will be freed when the kobject is done with */ |
e7fd4179 | 694 | |
90135925 | 695 | mutex_lock(&ls_lock); |
e7fd4179 DT |
696 | ls_count--; |
697 | if (!ls_count) | |
698 | threads_stop(); | |
90135925 | 699 | mutex_unlock(&ls_lock); |
e7fd4179 DT |
700 | |
701 | module_put(THIS_MODULE); | |
702 | return 0; | |
703 | } | |
704 | ||
705 | /* | |
706 | * Called when a system has released all its locks and is not going to use the | |
707 | * lockspace any longer. We free everything we're managing for this lockspace. | |
708 | * Remaining nodes will go through the recovery process as if we'd died. The | |
709 | * lockspace must continue to function as usual, participating in recoveries, | |
710 | * until this returns. | |
711 | * | |
712 | * Force has 4 possible values: | |
713 | * 0 - don't destroy locksapce if it has any LKBs | |
714 | * 1 - destroy lockspace if it has remote LKBs but not if it has local LKBs | |
715 | * 2 - destroy lockspace regardless of LKBs | |
716 | * 3 - destroy lockspace as part of a forced shutdown | |
717 | */ | |
718 | ||
719 | int dlm_release_lockspace(void *lockspace, int force) | |
720 | { | |
721 | struct dlm_ls *ls; | |
722 | ||
723 | ls = dlm_find_lockspace_local(lockspace); | |
724 | if (!ls) | |
725 | return -EINVAL; | |
726 | dlm_put_lockspace(ls); | |
727 | return release_lockspace(ls, force); | |
728 | } | |
729 |