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1/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5** Copyright (C) 2004-2011 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 "dir.h"
19#include "lowcomms.h"
20#include "config.h"
21#include "memory.h"
22#include "lock.h"
23#include "recover.h"
24#include "requestqueue.h"
25#include "user.h"
26#include "ast.h"
27
28static int ls_count;
29static struct mutex ls_lock;
30static struct list_head lslist;
31static spinlock_t lslist_lock;
32static struct task_struct * scand_task;
33
34
35static ssize_t dlm_control_store(struct dlm_ls *ls, const char *buf, size_t len)
36{
37 ssize_t ret = len;
38 int n;
39 int rc = kstrtoint(buf, 0, &n);
40
41 if (rc)
42 return rc;
43 ls = dlm_find_lockspace_local(ls->ls_local_handle);
44 if (!ls)
45 return -EINVAL;
46
47 switch (n) {
48 case 0:
49 dlm_ls_stop(ls);
50 break;
51 case 1:
52 dlm_ls_start(ls);
53 break;
54 default:
55 ret = -EINVAL;
56 }
57 dlm_put_lockspace(ls);
58 return ret;
59}
60
61static ssize_t dlm_event_store(struct dlm_ls *ls, const char *buf, size_t len)
62{
63 int rc = kstrtoint(buf, 0, &ls->ls_uevent_result);
64
65 if (rc)
66 return rc;
67 set_bit(LSFL_UEVENT_WAIT, &ls->ls_flags);
68 wake_up(&ls->ls_uevent_wait);
69 return len;
70}
71
72static ssize_t dlm_id_show(struct dlm_ls *ls, char *buf)
73{
74 return snprintf(buf, PAGE_SIZE, "%u\n", ls->ls_global_id);
75}
76
77static ssize_t dlm_id_store(struct dlm_ls *ls, const char *buf, size_t len)
78{
79 int rc = kstrtouint(buf, 0, &ls->ls_global_id);
80
81 if (rc)
82 return rc;
83 return len;
84}
85
86static ssize_t dlm_nodir_show(struct dlm_ls *ls, char *buf)
87{
88 return snprintf(buf, PAGE_SIZE, "%u\n", dlm_no_directory(ls));
89}
90
91static ssize_t dlm_nodir_store(struct dlm_ls *ls, const char *buf, size_t len)
92{
93 int val;
94 int rc = kstrtoint(buf, 0, &val);
95
96 if (rc)
97 return rc;
98 if (val == 1)
99 set_bit(LSFL_NODIR, &ls->ls_flags);
100 return len;
101}
102
103static ssize_t dlm_recover_status_show(struct dlm_ls *ls, char *buf)
104{
105 uint32_t status = dlm_recover_status(ls);
106 return snprintf(buf, PAGE_SIZE, "%x\n", status);
107}
108
109static ssize_t dlm_recover_nodeid_show(struct dlm_ls *ls, char *buf)
110{
111 return snprintf(buf, PAGE_SIZE, "%d\n", ls->ls_recover_nodeid);
112}
113
114struct dlm_attr {
115 struct attribute attr;
116 ssize_t (*show)(struct dlm_ls *, char *);
117 ssize_t (*store)(struct dlm_ls *, const char *, size_t);
118};
119
120static struct dlm_attr dlm_attr_control = {
121 .attr = {.name = "control", .mode = S_IWUSR},
122 .store = dlm_control_store
123};
124
125static struct dlm_attr dlm_attr_event = {
126 .attr = {.name = "event_done", .mode = S_IWUSR},
127 .store = dlm_event_store
128};
129
130static struct dlm_attr dlm_attr_id = {
131 .attr = {.name = "id", .mode = S_IRUGO | S_IWUSR},
132 .show = dlm_id_show,
133 .store = dlm_id_store
134};
135
136static struct dlm_attr dlm_attr_nodir = {
137 .attr = {.name = "nodir", .mode = S_IRUGO | S_IWUSR},
138 .show = dlm_nodir_show,
139 .store = dlm_nodir_store
140};
141
142static struct dlm_attr dlm_attr_recover_status = {
143 .attr = {.name = "recover_status", .mode = S_IRUGO},
144 .show = dlm_recover_status_show
145};
146
147static struct dlm_attr dlm_attr_recover_nodeid = {
148 .attr = {.name = "recover_nodeid", .mode = S_IRUGO},
149 .show = dlm_recover_nodeid_show
150};
151
152static struct attribute *dlm_attrs[] = {
153 &dlm_attr_control.attr,
154 &dlm_attr_event.attr,
155 &dlm_attr_id.attr,
156 &dlm_attr_nodir.attr,
157 &dlm_attr_recover_status.attr,
158 &dlm_attr_recover_nodeid.attr,
159 NULL,
160};
161
162static ssize_t dlm_attr_show(struct kobject *kobj, struct attribute *attr,
163 char *buf)
164{
165 struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
166 struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
167 return a->show ? a->show(ls, buf) : 0;
168}
169
170static ssize_t dlm_attr_store(struct kobject *kobj, struct attribute *attr,
171 const char *buf, size_t len)
172{
173 struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
174 struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
175 return a->store ? a->store(ls, buf, len) : len;
176}
177
178static void lockspace_kobj_release(struct kobject *k)
179{
180 struct dlm_ls *ls = container_of(k, struct dlm_ls, ls_kobj);
181 kfree(ls);
182}
183
184static const struct sysfs_ops dlm_attr_ops = {
185 .show = dlm_attr_show,
186 .store = dlm_attr_store,
187};
188
189static struct kobj_type dlm_ktype = {
190 .default_attrs = dlm_attrs,
191 .sysfs_ops = &dlm_attr_ops,
192 .release = lockspace_kobj_release,
193};
194
195static struct kset *dlm_kset;
196
197static int do_uevent(struct dlm_ls *ls, int in)
198{
199 int error;
200
201 if (in)
202 kobject_uevent(&ls->ls_kobj, KOBJ_ONLINE);
203 else
204 kobject_uevent(&ls->ls_kobj, KOBJ_OFFLINE);
205
206 log_rinfo(ls, "%s the lockspace group...", in ? "joining" : "leaving");
207
208 /* dlm_controld will see the uevent, do the necessary group management
209 and then write to sysfs to wake us */
210
211 error = wait_event_interruptible(ls->ls_uevent_wait,
212 test_and_clear_bit(LSFL_UEVENT_WAIT, &ls->ls_flags));
213
214 log_rinfo(ls, "group event done %d %d", error, ls->ls_uevent_result);
215
216 if (error)
217 goto out;
218
219 error = ls->ls_uevent_result;
220 out:
221 if (error)
222 log_error(ls, "group %s failed %d %d", in ? "join" : "leave",
223 error, ls->ls_uevent_result);
224 return error;
225}
226
227static int dlm_uevent(struct kset *kset, struct kobject *kobj,
228 struct kobj_uevent_env *env)
229{
230 struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
231
232 add_uevent_var(env, "LOCKSPACE=%s", ls->ls_name);
233 return 0;
234}
235
236static struct kset_uevent_ops dlm_uevent_ops = {
237 .uevent = dlm_uevent,
238};
239
240int __init dlm_lockspace_init(void)
241{
242 ls_count = 0;
243 mutex_init(&ls_lock);
244 INIT_LIST_HEAD(&lslist);
245 spin_lock_init(&lslist_lock);
246
247 dlm_kset = kset_create_and_add("dlm", &dlm_uevent_ops, kernel_kobj);
248 if (!dlm_kset) {
249 printk(KERN_WARNING "%s: can not create kset\n", __func__);
250 return -ENOMEM;
251 }
252 return 0;
253}
254
255void dlm_lockspace_exit(void)
256{
257 kset_unregister(dlm_kset);
258}
259
260static struct dlm_ls *find_ls_to_scan(void)
261{
262 struct dlm_ls *ls;
263
264 spin_lock(&lslist_lock);
265 list_for_each_entry(ls, &lslist, ls_list) {
266 if (time_after_eq(jiffies, ls->ls_scan_time +
267 dlm_config.ci_scan_secs * HZ)) {
268 spin_unlock(&lslist_lock);
269 return ls;
270 }
271 }
272 spin_unlock(&lslist_lock);
273 return NULL;
274}
275
276static int dlm_scand(void *data)
277{
278 struct dlm_ls *ls;
279
280 while (!kthread_should_stop()) {
281 ls = find_ls_to_scan();
282 if (ls) {
283 if (dlm_lock_recovery_try(ls)) {
284 ls->ls_scan_time = jiffies;
285 dlm_scan_rsbs(ls);
286 dlm_scan_timeout(ls);
287 dlm_scan_waiters(ls);
288 dlm_unlock_recovery(ls);
289 } else {
290 ls->ls_scan_time += HZ;
291 }
292 continue;
293 }
294 schedule_timeout_interruptible(dlm_config.ci_scan_secs * HZ);
295 }
296 return 0;
297}
298
299static int dlm_scand_start(void)
300{
301 struct task_struct *p;
302 int error = 0;
303
304 p = kthread_run(dlm_scand, NULL, "dlm_scand");
305 if (IS_ERR(p))
306 error = PTR_ERR(p);
307 else
308 scand_task = p;
309 return error;
310}
311
312static void dlm_scand_stop(void)
313{
314 kthread_stop(scand_task);
315}
316
317struct dlm_ls *dlm_find_lockspace_global(uint32_t id)
318{
319 struct dlm_ls *ls;
320
321 spin_lock(&lslist_lock);
322
323 list_for_each_entry(ls, &lslist, ls_list) {
324 if (ls->ls_global_id == id) {
325 ls->ls_count++;
326 goto out;
327 }
328 }
329 ls = NULL;
330 out:
331 spin_unlock(&lslist_lock);
332 return ls;
333}
334
335struct dlm_ls *dlm_find_lockspace_local(dlm_lockspace_t *lockspace)
336{
337 struct dlm_ls *ls;
338
339 spin_lock(&lslist_lock);
340 list_for_each_entry(ls, &lslist, ls_list) {
341 if (ls->ls_local_handle == lockspace) {
342 ls->ls_count++;
343 goto out;
344 }
345 }
346 ls = NULL;
347 out:
348 spin_unlock(&lslist_lock);
349 return ls;
350}
351
352struct dlm_ls *dlm_find_lockspace_device(int minor)
353{
354 struct dlm_ls *ls;
355
356 spin_lock(&lslist_lock);
357 list_for_each_entry(ls, &lslist, ls_list) {
358 if (ls->ls_device.minor == minor) {
359 ls->ls_count++;
360 goto out;
361 }
362 }
363 ls = NULL;
364 out:
365 spin_unlock(&lslist_lock);
366 return ls;
367}
368
369void dlm_put_lockspace(struct dlm_ls *ls)
370{
371 spin_lock(&lslist_lock);
372 ls->ls_count--;
373 spin_unlock(&lslist_lock);
374}
375
376static void remove_lockspace(struct dlm_ls *ls)
377{
378 for (;;) {
379 spin_lock(&lslist_lock);
380 if (ls->ls_count == 0) {
381 WARN_ON(ls->ls_create_count != 0);
382 list_del(&ls->ls_list);
383 spin_unlock(&lslist_lock);
384 return;
385 }
386 spin_unlock(&lslist_lock);
387 ssleep(1);
388 }
389}
390
391static int threads_start(void)
392{
393 int error;
394
395 error = dlm_scand_start();
396 if (error) {
397 log_print("cannot start dlm_scand thread %d", error);
398 goto fail;
399 }
400
401 /* Thread for sending/receiving messages for all lockspace's */
402 error = dlm_lowcomms_start();
403 if (error) {
404 log_print("cannot start dlm lowcomms %d", error);
405 goto scand_fail;
406 }
407
408 return 0;
409
410 scand_fail:
411 dlm_scand_stop();
412 fail:
413 return error;
414}
415
416static void threads_stop(void)
417{
418 dlm_scand_stop();
419 dlm_lowcomms_stop();
420}
421
422static int new_lockspace(const char *name, const char *cluster,
423 uint32_t flags, int lvblen,
424 const struct dlm_lockspace_ops *ops, void *ops_arg,
425 int *ops_result, dlm_lockspace_t **lockspace)
426{
427 struct dlm_ls *ls;
428 int i, size, error;
429 int do_unreg = 0;
430 int namelen = strlen(name);
431
432 if (namelen > DLM_LOCKSPACE_LEN)
433 return -EINVAL;
434
435 if (!lvblen || (lvblen % 8))
436 return -EINVAL;
437
438 if (!try_module_get(THIS_MODULE))
439 return -EINVAL;
440
441 if (!dlm_user_daemon_available()) {
442 log_print("dlm user daemon not available");
443 error = -EUNATCH;
444 goto out;
445 }
446
447 if (ops && ops_result) {
448 if (!dlm_config.ci_recover_callbacks)
449 *ops_result = -EOPNOTSUPP;
450 else
451 *ops_result = 0;
452 }
453
454 if (dlm_config.ci_recover_callbacks && cluster &&
455 strncmp(cluster, dlm_config.ci_cluster_name, DLM_LOCKSPACE_LEN)) {
456 log_print("dlm cluster name %s mismatch %s",
457 dlm_config.ci_cluster_name, cluster);
458 error = -EBADR;
459 goto out;
460 }
461
462 error = 0;
463
464 spin_lock(&lslist_lock);
465 list_for_each_entry(ls, &lslist, ls_list) {
466 WARN_ON(ls->ls_create_count <= 0);
467 if (ls->ls_namelen != namelen)
468 continue;
469 if (memcmp(ls->ls_name, name, namelen))
470 continue;
471 if (flags & DLM_LSFL_NEWEXCL) {
472 error = -EEXIST;
473 break;
474 }
475 ls->ls_create_count++;
476 *lockspace = ls;
477 error = 1;
478 break;
479 }
480 spin_unlock(&lslist_lock);
481
482 if (error)
483 goto out;
484
485 error = -ENOMEM;
486
487 ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_NOFS);
488 if (!ls)
489 goto out;
490 memcpy(ls->ls_name, name, namelen);
491 ls->ls_namelen = namelen;
492 ls->ls_lvblen = lvblen;
493 ls->ls_count = 0;
494 ls->ls_flags = 0;
495 ls->ls_scan_time = jiffies;
496
497 if (ops && dlm_config.ci_recover_callbacks) {
498 ls->ls_ops = ops;
499 ls->ls_ops_arg = ops_arg;
500 }
501
502 if (flags & DLM_LSFL_TIMEWARN)
503 set_bit(LSFL_TIMEWARN, &ls->ls_flags);
504
505 /* ls_exflags are forced to match among nodes, and we don't
506 need to require all nodes to have some flags set */
507 ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS |
508 DLM_LSFL_NEWEXCL));
509
510 size = dlm_config.ci_rsbtbl_size;
511 ls->ls_rsbtbl_size = size;
512
513 ls->ls_rsbtbl = vmalloc(sizeof(struct dlm_rsbtable) * size);
514 if (!ls->ls_rsbtbl)
515 goto out_lsfree;
516 for (i = 0; i < size; i++) {
517 ls->ls_rsbtbl[i].keep.rb_node = NULL;
518 ls->ls_rsbtbl[i].toss.rb_node = NULL;
519 spin_lock_init(&ls->ls_rsbtbl[i].lock);
520 }
521
522 spin_lock_init(&ls->ls_remove_spin);
523
524 for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++) {
525 ls->ls_remove_names[i] = kzalloc(DLM_RESNAME_MAXLEN+1,
526 GFP_KERNEL);
527 if (!ls->ls_remove_names[i])
528 goto out_rsbtbl;
529 }
530
531 idr_init(&ls->ls_lkbidr);
532 spin_lock_init(&ls->ls_lkbidr_spin);
533
534 INIT_LIST_HEAD(&ls->ls_waiters);
535 mutex_init(&ls->ls_waiters_mutex);
536 INIT_LIST_HEAD(&ls->ls_orphans);
537 mutex_init(&ls->ls_orphans_mutex);
538 INIT_LIST_HEAD(&ls->ls_timeout);
539 mutex_init(&ls->ls_timeout_mutex);
540
541 INIT_LIST_HEAD(&ls->ls_new_rsb);
542 spin_lock_init(&ls->ls_new_rsb_spin);
543
544 INIT_LIST_HEAD(&ls->ls_nodes);
545 INIT_LIST_HEAD(&ls->ls_nodes_gone);
546 ls->ls_num_nodes = 0;
547 ls->ls_low_nodeid = 0;
548 ls->ls_total_weight = 0;
549 ls->ls_node_array = NULL;
550
551 memset(&ls->ls_stub_rsb, 0, sizeof(struct dlm_rsb));
552 ls->ls_stub_rsb.res_ls = ls;
553
554 ls->ls_debug_rsb_dentry = NULL;
555 ls->ls_debug_waiters_dentry = NULL;
556
557 init_waitqueue_head(&ls->ls_uevent_wait);
558 ls->ls_uevent_result = 0;
559 init_completion(&ls->ls_members_done);
560 ls->ls_members_result = -1;
561
562 mutex_init(&ls->ls_cb_mutex);
563 INIT_LIST_HEAD(&ls->ls_cb_delay);
564
565 ls->ls_recoverd_task = NULL;
566 mutex_init(&ls->ls_recoverd_active);
567 spin_lock_init(&ls->ls_recover_lock);
568 spin_lock_init(&ls->ls_rcom_spin);
569 get_random_bytes(&ls->ls_rcom_seq, sizeof(uint64_t));
570 ls->ls_recover_status = 0;
571 ls->ls_recover_seq = 0;
572 ls->ls_recover_args = NULL;
573 init_rwsem(&ls->ls_in_recovery);
574 init_rwsem(&ls->ls_recv_active);
575 INIT_LIST_HEAD(&ls->ls_requestqueue);
576 mutex_init(&ls->ls_requestqueue_mutex);
577 mutex_init(&ls->ls_clear_proc_locks);
578
579 ls->ls_recover_buf = kmalloc(dlm_config.ci_buffer_size, GFP_NOFS);
580 if (!ls->ls_recover_buf)
581 goto out_lkbidr;
582
583 ls->ls_slot = 0;
584 ls->ls_num_slots = 0;
585 ls->ls_slots_size = 0;
586 ls->ls_slots = NULL;
587
588 INIT_LIST_HEAD(&ls->ls_recover_list);
589 spin_lock_init(&ls->ls_recover_list_lock);
590 idr_init(&ls->ls_recover_idr);
591 spin_lock_init(&ls->ls_recover_idr_lock);
592 ls->ls_recover_list_count = 0;
593 ls->ls_local_handle = ls;
594 init_waitqueue_head(&ls->ls_wait_general);
595 INIT_LIST_HEAD(&ls->ls_root_list);
596 init_rwsem(&ls->ls_root_sem);
597
598 spin_lock(&lslist_lock);
599 ls->ls_create_count = 1;
600 list_add(&ls->ls_list, &lslist);
601 spin_unlock(&lslist_lock);
602
603 if (flags & DLM_LSFL_FS) {
604 error = dlm_callback_start(ls);
605 if (error) {
606 log_error(ls, "can't start dlm_callback %d", error);
607 goto out_delist;
608 }
609 }
610
611 init_waitqueue_head(&ls->ls_recover_lock_wait);
612
613 /*
614 * Once started, dlm_recoverd first looks for ls in lslist, then
615 * initializes ls_in_recovery as locked in "down" mode. We need
616 * to wait for the wakeup from dlm_recoverd because in_recovery
617 * has to start out in down mode.
618 */
619
620 error = dlm_recoverd_start(ls);
621 if (error) {
622 log_error(ls, "can't start dlm_recoverd %d", error);
623 goto out_callback;
624 }
625
626 wait_event(ls->ls_recover_lock_wait,
627 test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags));
628
629 ls->ls_kobj.kset = dlm_kset;
630 error = kobject_init_and_add(&ls->ls_kobj, &dlm_ktype, NULL,
631 "%s", ls->ls_name);
632 if (error)
633 goto out_recoverd;
634 kobject_uevent(&ls->ls_kobj, KOBJ_ADD);
635
636 /* let kobject handle freeing of ls if there's an error */
637 do_unreg = 1;
638
639 /* This uevent triggers dlm_controld in userspace to add us to the
640 group of nodes that are members of this lockspace (managed by the
641 cluster infrastructure.) Once it's done that, it tells us who the
642 current lockspace members are (via configfs) and then tells the
643 lockspace to start running (via sysfs) in dlm_ls_start(). */
644
645 error = do_uevent(ls, 1);
646 if (error)
647 goto out_recoverd;
648
649 wait_for_completion(&ls->ls_members_done);
650 error = ls->ls_members_result;
651 if (error)
652 goto out_members;
653
654 dlm_create_debug_file(ls);
655
656 log_rinfo(ls, "join complete");
657 *lockspace = ls;
658 return 0;
659
660 out_members:
661 do_uevent(ls, 0);
662 dlm_clear_members(ls);
663 kfree(ls->ls_node_array);
664 out_recoverd:
665 dlm_recoverd_stop(ls);
666 out_callback:
667 dlm_callback_stop(ls);
668 out_delist:
669 spin_lock(&lslist_lock);
670 list_del(&ls->ls_list);
671 spin_unlock(&lslist_lock);
672 idr_destroy(&ls->ls_recover_idr);
673 kfree(ls->ls_recover_buf);
674 out_lkbidr:
675 idr_destroy(&ls->ls_lkbidr);
676 for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++) {
677 if (ls->ls_remove_names[i])
678 kfree(ls->ls_remove_names[i]);
679 }
680 out_rsbtbl:
681 vfree(ls->ls_rsbtbl);
682 out_lsfree:
683 if (do_unreg)
684 kobject_put(&ls->ls_kobj);
685 else
686 kfree(ls);
687 out:
688 module_put(THIS_MODULE);
689 return error;
690}
691
692int dlm_new_lockspace(const char *name, const char *cluster,
693 uint32_t flags, int lvblen,
694 const struct dlm_lockspace_ops *ops, void *ops_arg,
695 int *ops_result, dlm_lockspace_t **lockspace)
696{
697 int error = 0;
698
699 mutex_lock(&ls_lock);
700 if (!ls_count)
701 error = threads_start();
702 if (error)
703 goto out;
704
705 error = new_lockspace(name, cluster, flags, lvblen, ops, ops_arg,
706 ops_result, lockspace);
707 if (!error)
708 ls_count++;
709 if (error > 0)
710 error = 0;
711 if (!ls_count)
712 threads_stop();
713 out:
714 mutex_unlock(&ls_lock);
715 return error;
716}
717
718static int lkb_idr_is_local(int id, void *p, void *data)
719{
720 struct dlm_lkb *lkb = p;
721
722 return lkb->lkb_nodeid == 0 && lkb->lkb_grmode != DLM_LOCK_IV;
723}
724
725static int lkb_idr_is_any(int id, void *p, void *data)
726{
727 return 1;
728}
729
730static int lkb_idr_free(int id, void *p, void *data)
731{
732 struct dlm_lkb *lkb = p;
733
734 if (lkb->lkb_lvbptr && lkb->lkb_flags & DLM_IFL_MSTCPY)
735 dlm_free_lvb(lkb->lkb_lvbptr);
736
737 dlm_free_lkb(lkb);
738 return 0;
739}
740
741/* NOTE: We check the lkbidr here rather than the resource table.
742 This is because there may be LKBs queued as ASTs that have been unlinked
743 from their RSBs and are pending deletion once the AST has been delivered */
744
745static int lockspace_busy(struct dlm_ls *ls, int force)
746{
747 int rv;
748
749 spin_lock(&ls->ls_lkbidr_spin);
750 if (force == 0) {
751 rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_any, ls);
752 } else if (force == 1) {
753 rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_local, ls);
754 } else {
755 rv = 0;
756 }
757 spin_unlock(&ls->ls_lkbidr_spin);
758 return rv;
759}
760
761static int release_lockspace(struct dlm_ls *ls, int force)
762{
763 struct dlm_rsb *rsb;
764 struct rb_node *n;
765 int i, busy, rv;
766
767 busy = lockspace_busy(ls, force);
768
769 spin_lock(&lslist_lock);
770 if (ls->ls_create_count == 1) {
771 if (busy) {
772 rv = -EBUSY;
773 } else {
774 /* remove_lockspace takes ls off lslist */
775 ls->ls_create_count = 0;
776 rv = 0;
777 }
778 } else if (ls->ls_create_count > 1) {
779 rv = --ls->ls_create_count;
780 } else {
781 rv = -EINVAL;
782 }
783 spin_unlock(&lslist_lock);
784
785 if (rv) {
786 log_debug(ls, "release_lockspace no remove %d", rv);
787 return rv;
788 }
789
790 dlm_device_deregister(ls);
791
792 if (force < 3 && dlm_user_daemon_available())
793 do_uevent(ls, 0);
794
795 dlm_recoverd_stop(ls);
796
797 dlm_callback_stop(ls);
798
799 remove_lockspace(ls);
800
801 dlm_delete_debug_file(ls);
802
803 kfree(ls->ls_recover_buf);
804
805 /*
806 * Free all lkb's in idr
807 */
808
809 idr_for_each(&ls->ls_lkbidr, lkb_idr_free, ls);
810 idr_destroy(&ls->ls_lkbidr);
811
812 /*
813 * Free all rsb's on rsbtbl[] lists
814 */
815
816 for (i = 0; i < ls->ls_rsbtbl_size; i++) {
817 while ((n = rb_first(&ls->ls_rsbtbl[i].keep))) {
818 rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
819 rb_erase(n, &ls->ls_rsbtbl[i].keep);
820 dlm_free_rsb(rsb);
821 }
822
823 while ((n = rb_first(&ls->ls_rsbtbl[i].toss))) {
824 rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
825 rb_erase(n, &ls->ls_rsbtbl[i].toss);
826 dlm_free_rsb(rsb);
827 }
828 }
829
830 vfree(ls->ls_rsbtbl);
831
832 for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++)
833 kfree(ls->ls_remove_names[i]);
834
835 while (!list_empty(&ls->ls_new_rsb)) {
836 rsb = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb,
837 res_hashchain);
838 list_del(&rsb->res_hashchain);
839 dlm_free_rsb(rsb);
840 }
841
842 /*
843 * Free structures on any other lists
844 */
845
846 dlm_purge_requestqueue(ls);
847 kfree(ls->ls_recover_args);
848 dlm_clear_members(ls);
849 dlm_clear_members_gone(ls);
850 kfree(ls->ls_node_array);
851 log_rinfo(ls, "release_lockspace final free");
852 kobject_put(&ls->ls_kobj);
853 /* The ls structure will be freed when the kobject is done with */
854
855 module_put(THIS_MODULE);
856 return 0;
857}
858
859/*
860 * Called when a system has released all its locks and is not going to use the
861 * lockspace any longer. We free everything we're managing for this lockspace.
862 * Remaining nodes will go through the recovery process as if we'd died. The
863 * lockspace must continue to function as usual, participating in recoveries,
864 * until this returns.
865 *
866 * Force has 4 possible values:
867 * 0 - don't destroy locksapce if it has any LKBs
868 * 1 - destroy lockspace if it has remote LKBs but not if it has local LKBs
869 * 2 - destroy lockspace regardless of LKBs
870 * 3 - destroy lockspace as part of a forced shutdown
871 */
872
873int dlm_release_lockspace(void *lockspace, int force)
874{
875 struct dlm_ls *ls;
876 int error;
877
878 ls = dlm_find_lockspace_local(lockspace);
879 if (!ls)
880 return -EINVAL;
881 dlm_put_lockspace(ls);
882
883 mutex_lock(&ls_lock);
884 error = release_lockspace(ls, force);
885 if (!error)
886 ls_count--;
887 if (!ls_count)
888 threads_stop();
889 mutex_unlock(&ls_lock);
890
891 return error;
892}
893
894void dlm_stop_lockspaces(void)
895{
896 struct dlm_ls *ls;
897 int count;
898
899 restart:
900 count = 0;
901 spin_lock(&lslist_lock);
902 list_for_each_entry(ls, &lslist, ls_list) {
903 if (!test_bit(LSFL_RUNNING, &ls->ls_flags)) {
904 count++;
905 continue;
906 }
907 spin_unlock(&lslist_lock);
908 log_error(ls, "no userland control daemon, stopping lockspace");
909 dlm_ls_stop(ls);
910 goto restart;
911 }
912 spin_unlock(&lslist_lock);
913
914 if (count)
915 log_print("dlm user daemon left %d lockspaces", count);
916}
917
1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3*******************************************************************************
4**
5** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
6** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
7**
8**
9*******************************************************************************
10******************************************************************************/
11
12#include <linux/module.h>
13
14#include "dlm_internal.h"
15#include "lockspace.h"
16#include "member.h"
17#include "recoverd.h"
18#include "dir.h"
19#include "midcomms.h"
20#include "lowcomms.h"
21#include "config.h"
22#include "memory.h"
23#include "lock.h"
24#include "recover.h"
25#include "requestqueue.h"
26#include "user.h"
27#include "ast.h"
28
29static int ls_count;
30static struct mutex ls_lock;
31static struct list_head lslist;
32static spinlock_t lslist_lock;
33static struct task_struct * scand_task;
34
35
36static ssize_t dlm_control_store(struct dlm_ls *ls, const char *buf, size_t len)
37{
38 ssize_t ret = len;
39 int n;
40 int rc = kstrtoint(buf, 0, &n);
41
42 if (rc)
43 return rc;
44 ls = dlm_find_lockspace_local(ls->ls_local_handle);
45 if (!ls)
46 return -EINVAL;
47
48 switch (n) {
49 case 0:
50 dlm_ls_stop(ls);
51 break;
52 case 1:
53 dlm_ls_start(ls);
54 break;
55 default:
56 ret = -EINVAL;
57 }
58 dlm_put_lockspace(ls);
59 return ret;
60}
61
62static ssize_t dlm_event_store(struct dlm_ls *ls, const char *buf, size_t len)
63{
64 int rc = kstrtoint(buf, 0, &ls->ls_uevent_result);
65
66 if (rc)
67 return rc;
68 set_bit(LSFL_UEVENT_WAIT, &ls->ls_flags);
69 wake_up(&ls->ls_uevent_wait);
70 return len;
71}
72
73static ssize_t dlm_id_show(struct dlm_ls *ls, char *buf)
74{
75 return snprintf(buf, PAGE_SIZE, "%u\n", ls->ls_global_id);
76}
77
78static ssize_t dlm_id_store(struct dlm_ls *ls, const char *buf, size_t len)
79{
80 int rc = kstrtouint(buf, 0, &ls->ls_global_id);
81
82 if (rc)
83 return rc;
84 return len;
85}
86
87static ssize_t dlm_nodir_show(struct dlm_ls *ls, char *buf)
88{
89 return snprintf(buf, PAGE_SIZE, "%u\n", dlm_no_directory(ls));
90}
91
92static ssize_t dlm_nodir_store(struct dlm_ls *ls, const char *buf, size_t len)
93{
94 int val;
95 int rc = kstrtoint(buf, 0, &val);
96
97 if (rc)
98 return rc;
99 if (val == 1)
100 set_bit(LSFL_NODIR, &ls->ls_flags);
101 return len;
102}
103
104static ssize_t dlm_recover_status_show(struct dlm_ls *ls, char *buf)
105{
106 uint32_t status = dlm_recover_status(ls);
107 return snprintf(buf, PAGE_SIZE, "%x\n", status);
108}
109
110static ssize_t dlm_recover_nodeid_show(struct dlm_ls *ls, char *buf)
111{
112 return snprintf(buf, PAGE_SIZE, "%d\n", ls->ls_recover_nodeid);
113}
114
115struct dlm_attr {
116 struct attribute attr;
117 ssize_t (*show)(struct dlm_ls *, char *);
118 ssize_t (*store)(struct dlm_ls *, const char *, size_t);
119};
120
121static struct dlm_attr dlm_attr_control = {
122 .attr = {.name = "control", .mode = S_IWUSR},
123 .store = dlm_control_store
124};
125
126static struct dlm_attr dlm_attr_event = {
127 .attr = {.name = "event_done", .mode = S_IWUSR},
128 .store = dlm_event_store
129};
130
131static struct dlm_attr dlm_attr_id = {
132 .attr = {.name = "id", .mode = S_IRUGO | S_IWUSR},
133 .show = dlm_id_show,
134 .store = dlm_id_store
135};
136
137static struct dlm_attr dlm_attr_nodir = {
138 .attr = {.name = "nodir", .mode = S_IRUGO | S_IWUSR},
139 .show = dlm_nodir_show,
140 .store = dlm_nodir_store
141};
142
143static struct dlm_attr dlm_attr_recover_status = {
144 .attr = {.name = "recover_status", .mode = S_IRUGO},
145 .show = dlm_recover_status_show
146};
147
148static struct dlm_attr dlm_attr_recover_nodeid = {
149 .attr = {.name = "recover_nodeid", .mode = S_IRUGO},
150 .show = dlm_recover_nodeid_show
151};
152
153static struct attribute *dlm_attrs[] = {
154 &dlm_attr_control.attr,
155 &dlm_attr_event.attr,
156 &dlm_attr_id.attr,
157 &dlm_attr_nodir.attr,
158 &dlm_attr_recover_status.attr,
159 &dlm_attr_recover_nodeid.attr,
160 NULL,
161};
162ATTRIBUTE_GROUPS(dlm);
163
164static ssize_t dlm_attr_show(struct kobject *kobj, struct attribute *attr,
165 char *buf)
166{
167 struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
168 struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
169 return a->show ? a->show(ls, buf) : 0;
170}
171
172static ssize_t dlm_attr_store(struct kobject *kobj, struct attribute *attr,
173 const char *buf, size_t len)
174{
175 struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
176 struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
177 return a->store ? a->store(ls, buf, len) : len;
178}
179
180static void lockspace_kobj_release(struct kobject *k)
181{
182 struct dlm_ls *ls = container_of(k, struct dlm_ls, ls_kobj);
183 kfree(ls);
184}
185
186static const struct sysfs_ops dlm_attr_ops = {
187 .show = dlm_attr_show,
188 .store = dlm_attr_store,
189};
190
191static struct kobj_type dlm_ktype = {
192 .default_groups = dlm_groups,
193 .sysfs_ops = &dlm_attr_ops,
194 .release = lockspace_kobj_release,
195};
196
197static struct kset *dlm_kset;
198
199static int do_uevent(struct dlm_ls *ls, int in)
200{
201 if (in)
202 kobject_uevent(&ls->ls_kobj, KOBJ_ONLINE);
203 else
204 kobject_uevent(&ls->ls_kobj, KOBJ_OFFLINE);
205
206 log_rinfo(ls, "%s the lockspace group...", in ? "joining" : "leaving");
207
208 /* dlm_controld will see the uevent, do the necessary group management
209 and then write to sysfs to wake us */
210
211 wait_event(ls->ls_uevent_wait,
212 test_and_clear_bit(LSFL_UEVENT_WAIT, &ls->ls_flags));
213
214 log_rinfo(ls, "group event done %d", ls->ls_uevent_result);
215
216 return ls->ls_uevent_result;
217}
218
219static int dlm_uevent(struct kset *kset, struct kobject *kobj,
220 struct kobj_uevent_env *env)
221{
222 struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
223
224 add_uevent_var(env, "LOCKSPACE=%s", ls->ls_name);
225 return 0;
226}
227
228static const struct kset_uevent_ops dlm_uevent_ops = {
229 .uevent = dlm_uevent,
230};
231
232int __init dlm_lockspace_init(void)
233{
234 ls_count = 0;
235 mutex_init(&ls_lock);
236 INIT_LIST_HEAD(&lslist);
237 spin_lock_init(&lslist_lock);
238
239 dlm_kset = kset_create_and_add("dlm", &dlm_uevent_ops, kernel_kobj);
240 if (!dlm_kset) {
241 printk(KERN_WARNING "%s: can not create kset\n", __func__);
242 return -ENOMEM;
243 }
244 return 0;
245}
246
247void dlm_lockspace_exit(void)
248{
249 kset_unregister(dlm_kset);
250}
251
252static struct dlm_ls *find_ls_to_scan(void)
253{
254 struct dlm_ls *ls;
255
256 spin_lock(&lslist_lock);
257 list_for_each_entry(ls, &lslist, ls_list) {
258 if (time_after_eq(jiffies, ls->ls_scan_time +
259 dlm_config.ci_scan_secs * HZ)) {
260 spin_unlock(&lslist_lock);
261 return ls;
262 }
263 }
264 spin_unlock(&lslist_lock);
265 return NULL;
266}
267
268static int dlm_scand(void *data)
269{
270 struct dlm_ls *ls;
271
272 while (!kthread_should_stop()) {
273 ls = find_ls_to_scan();
274 if (ls) {
275 if (dlm_lock_recovery_try(ls)) {
276 ls->ls_scan_time = jiffies;
277 dlm_scan_rsbs(ls);
278 dlm_scan_timeout(ls);
279 dlm_scan_waiters(ls);
280 dlm_unlock_recovery(ls);
281 } else {
282 ls->ls_scan_time += HZ;
283 }
284 continue;
285 }
286 schedule_timeout_interruptible(dlm_config.ci_scan_secs * HZ);
287 }
288 return 0;
289}
290
291static int dlm_scand_start(void)
292{
293 struct task_struct *p;
294 int error = 0;
295
296 p = kthread_run(dlm_scand, NULL, "dlm_scand");
297 if (IS_ERR(p))
298 error = PTR_ERR(p);
299 else
300 scand_task = p;
301 return error;
302}
303
304static void dlm_scand_stop(void)
305{
306 kthread_stop(scand_task);
307}
308
309struct dlm_ls *dlm_find_lockspace_global(uint32_t id)
310{
311 struct dlm_ls *ls;
312
313 spin_lock(&lslist_lock);
314
315 list_for_each_entry(ls, &lslist, ls_list) {
316 if (ls->ls_global_id == id) {
317 ls->ls_count++;
318 goto out;
319 }
320 }
321 ls = NULL;
322 out:
323 spin_unlock(&lslist_lock);
324 return ls;
325}
326
327struct dlm_ls *dlm_find_lockspace_local(dlm_lockspace_t *lockspace)
328{
329 struct dlm_ls *ls;
330
331 spin_lock(&lslist_lock);
332 list_for_each_entry(ls, &lslist, ls_list) {
333 if (ls->ls_local_handle == lockspace) {
334 ls->ls_count++;
335 goto out;
336 }
337 }
338 ls = NULL;
339 out:
340 spin_unlock(&lslist_lock);
341 return ls;
342}
343
344struct dlm_ls *dlm_find_lockspace_device(int minor)
345{
346 struct dlm_ls *ls;
347
348 spin_lock(&lslist_lock);
349 list_for_each_entry(ls, &lslist, ls_list) {
350 if (ls->ls_device.minor == minor) {
351 ls->ls_count++;
352 goto out;
353 }
354 }
355 ls = NULL;
356 out:
357 spin_unlock(&lslist_lock);
358 return ls;
359}
360
361void dlm_put_lockspace(struct dlm_ls *ls)
362{
363 spin_lock(&lslist_lock);
364 ls->ls_count--;
365 spin_unlock(&lslist_lock);
366}
367
368static void remove_lockspace(struct dlm_ls *ls)
369{
370 for (;;) {
371 spin_lock(&lslist_lock);
372 if (ls->ls_count == 0) {
373 WARN_ON(ls->ls_create_count != 0);
374 list_del(&ls->ls_list);
375 spin_unlock(&lslist_lock);
376 return;
377 }
378 spin_unlock(&lslist_lock);
379 ssleep(1);
380 }
381}
382
383static int threads_start(void)
384{
385 int error;
386
387 error = dlm_scand_start();
388 if (error) {
389 log_print("cannot start dlm_scand thread %d", error);
390 goto fail;
391 }
392
393 /* Thread for sending/receiving messages for all lockspace's */
394 error = dlm_midcomms_start();
395 if (error) {
396 log_print("cannot start dlm lowcomms %d", error);
397 goto scand_fail;
398 }
399
400 return 0;
401
402 scand_fail:
403 dlm_scand_stop();
404 fail:
405 return error;
406}
407
408static int new_lockspace(const char *name, const char *cluster,
409 uint32_t flags, int lvblen,
410 const struct dlm_lockspace_ops *ops, void *ops_arg,
411 int *ops_result, dlm_lockspace_t **lockspace)
412{
413 struct dlm_ls *ls;
414 int i, size, error;
415 int do_unreg = 0;
416 int namelen = strlen(name);
417
418 if (namelen > DLM_LOCKSPACE_LEN || namelen == 0)
419 return -EINVAL;
420
421 if (!lvblen || (lvblen % 8))
422 return -EINVAL;
423
424 if (!try_module_get(THIS_MODULE))
425 return -EINVAL;
426
427 if (!dlm_user_daemon_available()) {
428 log_print("dlm user daemon not available");
429 error = -EUNATCH;
430 goto out;
431 }
432
433 if (ops && ops_result) {
434 if (!dlm_config.ci_recover_callbacks)
435 *ops_result = -EOPNOTSUPP;
436 else
437 *ops_result = 0;
438 }
439
440 if (!cluster)
441 log_print("dlm cluster name '%s' is being used without an application provided cluster name",
442 dlm_config.ci_cluster_name);
443
444 if (dlm_config.ci_recover_callbacks && cluster &&
445 strncmp(cluster, dlm_config.ci_cluster_name, DLM_LOCKSPACE_LEN)) {
446 log_print("dlm cluster name '%s' does not match "
447 "the application cluster name '%s'",
448 dlm_config.ci_cluster_name, cluster);
449 error = -EBADR;
450 goto out;
451 }
452
453 error = 0;
454
455 spin_lock(&lslist_lock);
456 list_for_each_entry(ls, &lslist, ls_list) {
457 WARN_ON(ls->ls_create_count <= 0);
458 if (ls->ls_namelen != namelen)
459 continue;
460 if (memcmp(ls->ls_name, name, namelen))
461 continue;
462 if (flags & DLM_LSFL_NEWEXCL) {
463 error = -EEXIST;
464 break;
465 }
466 ls->ls_create_count++;
467 *lockspace = ls;
468 error = 1;
469 break;
470 }
471 spin_unlock(&lslist_lock);
472
473 if (error)
474 goto out;
475
476 error = -ENOMEM;
477
478 ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_NOFS);
479 if (!ls)
480 goto out;
481 memcpy(ls->ls_name, name, namelen);
482 ls->ls_namelen = namelen;
483 ls->ls_lvblen = lvblen;
484 ls->ls_count = 0;
485 ls->ls_flags = 0;
486 ls->ls_scan_time = jiffies;
487
488 if (ops && dlm_config.ci_recover_callbacks) {
489 ls->ls_ops = ops;
490 ls->ls_ops_arg = ops_arg;
491 }
492
493 if (flags & DLM_LSFL_TIMEWARN)
494 set_bit(LSFL_TIMEWARN, &ls->ls_flags);
495
496 /* ls_exflags are forced to match among nodes, and we don't
497 need to require all nodes to have some flags set */
498 ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS |
499 DLM_LSFL_NEWEXCL));
500
501 size = dlm_config.ci_rsbtbl_size;
502 ls->ls_rsbtbl_size = size;
503
504 ls->ls_rsbtbl = vmalloc(array_size(size, sizeof(struct dlm_rsbtable)));
505 if (!ls->ls_rsbtbl)
506 goto out_lsfree;
507 for (i = 0; i < size; i++) {
508 ls->ls_rsbtbl[i].keep.rb_node = NULL;
509 ls->ls_rsbtbl[i].toss.rb_node = NULL;
510 spin_lock_init(&ls->ls_rsbtbl[i].lock);
511 }
512
513 spin_lock_init(&ls->ls_remove_spin);
514
515 for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++) {
516 ls->ls_remove_names[i] = kzalloc(DLM_RESNAME_MAXLEN+1,
517 GFP_KERNEL);
518 if (!ls->ls_remove_names[i])
519 goto out_rsbtbl;
520 }
521
522 idr_init(&ls->ls_lkbidr);
523 spin_lock_init(&ls->ls_lkbidr_spin);
524
525 INIT_LIST_HEAD(&ls->ls_waiters);
526 mutex_init(&ls->ls_waiters_mutex);
527 INIT_LIST_HEAD(&ls->ls_orphans);
528 mutex_init(&ls->ls_orphans_mutex);
529 INIT_LIST_HEAD(&ls->ls_timeout);
530 mutex_init(&ls->ls_timeout_mutex);
531
532 INIT_LIST_HEAD(&ls->ls_new_rsb);
533 spin_lock_init(&ls->ls_new_rsb_spin);
534
535 INIT_LIST_HEAD(&ls->ls_nodes);
536 INIT_LIST_HEAD(&ls->ls_nodes_gone);
537 ls->ls_num_nodes = 0;
538 ls->ls_low_nodeid = 0;
539 ls->ls_total_weight = 0;
540 ls->ls_node_array = NULL;
541
542 memset(&ls->ls_stub_rsb, 0, sizeof(struct dlm_rsb));
543 ls->ls_stub_rsb.res_ls = ls;
544
545 ls->ls_debug_rsb_dentry = NULL;
546 ls->ls_debug_waiters_dentry = NULL;
547
548 init_waitqueue_head(&ls->ls_uevent_wait);
549 ls->ls_uevent_result = 0;
550 init_completion(&ls->ls_members_done);
551 ls->ls_members_result = -1;
552
553 mutex_init(&ls->ls_cb_mutex);
554 INIT_LIST_HEAD(&ls->ls_cb_delay);
555
556 ls->ls_recoverd_task = NULL;
557 mutex_init(&ls->ls_recoverd_active);
558 spin_lock_init(&ls->ls_recover_lock);
559 spin_lock_init(&ls->ls_rcom_spin);
560 get_random_bytes(&ls->ls_rcom_seq, sizeof(uint64_t));
561 ls->ls_recover_status = 0;
562 ls->ls_recover_seq = 0;
563 ls->ls_recover_args = NULL;
564 init_rwsem(&ls->ls_in_recovery);
565 init_rwsem(&ls->ls_recv_active);
566 INIT_LIST_HEAD(&ls->ls_requestqueue);
567 mutex_init(&ls->ls_requestqueue_mutex);
568 mutex_init(&ls->ls_clear_proc_locks);
569
570 /* Due backwards compatibility with 3.1 we need to use maximum
571 * possible dlm message size to be sure the message will fit and
572 * not having out of bounds issues. However on sending side 3.2
573 * might send less.
574 */
575 ls->ls_recover_buf = kmalloc(DLM_MAX_SOCKET_BUFSIZE, GFP_NOFS);
576 if (!ls->ls_recover_buf)
577 goto out_lkbidr;
578
579 ls->ls_slot = 0;
580 ls->ls_num_slots = 0;
581 ls->ls_slots_size = 0;
582 ls->ls_slots = NULL;
583
584 INIT_LIST_HEAD(&ls->ls_recover_list);
585 spin_lock_init(&ls->ls_recover_list_lock);
586 idr_init(&ls->ls_recover_idr);
587 spin_lock_init(&ls->ls_recover_idr_lock);
588 ls->ls_recover_list_count = 0;
589 ls->ls_local_handle = ls;
590 init_waitqueue_head(&ls->ls_wait_general);
591 INIT_LIST_HEAD(&ls->ls_root_list);
592 init_rwsem(&ls->ls_root_sem);
593
594 spin_lock(&lslist_lock);
595 ls->ls_create_count = 1;
596 list_add(&ls->ls_list, &lslist);
597 spin_unlock(&lslist_lock);
598
599 if (flags & DLM_LSFL_FS) {
600 error = dlm_callback_start(ls);
601 if (error) {
602 log_error(ls, "can't start dlm_callback %d", error);
603 goto out_delist;
604 }
605 }
606
607 init_waitqueue_head(&ls->ls_recover_lock_wait);
608
609 /*
610 * Once started, dlm_recoverd first looks for ls in lslist, then
611 * initializes ls_in_recovery as locked in "down" mode. We need
612 * to wait for the wakeup from dlm_recoverd because in_recovery
613 * has to start out in down mode.
614 */
615
616 error = dlm_recoverd_start(ls);
617 if (error) {
618 log_error(ls, "can't start dlm_recoverd %d", error);
619 goto out_callback;
620 }
621
622 wait_event(ls->ls_recover_lock_wait,
623 test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags));
624
625 /* let kobject handle freeing of ls if there's an error */
626 do_unreg = 1;
627
628 ls->ls_kobj.kset = dlm_kset;
629 error = kobject_init_and_add(&ls->ls_kobj, &dlm_ktype, NULL,
630 "%s", ls->ls_name);
631 if (error)
632 goto out_recoverd;
633 kobject_uevent(&ls->ls_kobj, KOBJ_ADD);
634
635 /* This uevent triggers dlm_controld in userspace to add us to the
636 group of nodes that are members of this lockspace (managed by the
637 cluster infrastructure.) Once it's done that, it tells us who the
638 current lockspace members are (via configfs) and then tells the
639 lockspace to start running (via sysfs) in dlm_ls_start(). */
640
641 error = do_uevent(ls, 1);
642 if (error)
643 goto out_recoverd;
644
645 wait_for_completion(&ls->ls_members_done);
646 error = ls->ls_members_result;
647 if (error)
648 goto out_members;
649
650 dlm_create_debug_file(ls);
651
652 log_rinfo(ls, "join complete");
653 *lockspace = ls;
654 return 0;
655
656 out_members:
657 do_uevent(ls, 0);
658 dlm_clear_members(ls);
659 kfree(ls->ls_node_array);
660 out_recoverd:
661 dlm_recoverd_stop(ls);
662 out_callback:
663 dlm_callback_stop(ls);
664 out_delist:
665 spin_lock(&lslist_lock);
666 list_del(&ls->ls_list);
667 spin_unlock(&lslist_lock);
668 idr_destroy(&ls->ls_recover_idr);
669 kfree(ls->ls_recover_buf);
670 out_lkbidr:
671 idr_destroy(&ls->ls_lkbidr);
672 out_rsbtbl:
673 for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++)
674 kfree(ls->ls_remove_names[i]);
675 vfree(ls->ls_rsbtbl);
676 out_lsfree:
677 if (do_unreg)
678 kobject_put(&ls->ls_kobj);
679 else
680 kfree(ls);
681 out:
682 module_put(THIS_MODULE);
683 return error;
684}
685
686int dlm_new_lockspace(const char *name, const char *cluster,
687 uint32_t flags, int lvblen,
688 const struct dlm_lockspace_ops *ops, void *ops_arg,
689 int *ops_result, dlm_lockspace_t **lockspace)
690{
691 int error = 0;
692
693 mutex_lock(&ls_lock);
694 if (!ls_count)
695 error = threads_start();
696 if (error)
697 goto out;
698
699 error = new_lockspace(name, cluster, flags, lvblen, ops, ops_arg,
700 ops_result, lockspace);
701 if (!error)
702 ls_count++;
703 if (error > 0)
704 error = 0;
705 if (!ls_count) {
706 dlm_scand_stop();
707 dlm_midcomms_shutdown();
708 dlm_lowcomms_stop();
709 }
710 out:
711 mutex_unlock(&ls_lock);
712 return error;
713}
714
715static int lkb_idr_is_local(int id, void *p, void *data)
716{
717 struct dlm_lkb *lkb = p;
718
719 return lkb->lkb_nodeid == 0 && lkb->lkb_grmode != DLM_LOCK_IV;
720}
721
722static int lkb_idr_is_any(int id, void *p, void *data)
723{
724 return 1;
725}
726
727static int lkb_idr_free(int id, void *p, void *data)
728{
729 struct dlm_lkb *lkb = p;
730
731 if (lkb->lkb_lvbptr && lkb->lkb_flags & DLM_IFL_MSTCPY)
732 dlm_free_lvb(lkb->lkb_lvbptr);
733
734 dlm_free_lkb(lkb);
735 return 0;
736}
737
738/* NOTE: We check the lkbidr here rather than the resource table.
739 This is because there may be LKBs queued as ASTs that have been unlinked
740 from their RSBs and are pending deletion once the AST has been delivered */
741
742static int lockspace_busy(struct dlm_ls *ls, int force)
743{
744 int rv;
745
746 spin_lock(&ls->ls_lkbidr_spin);
747 if (force == 0) {
748 rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_any, ls);
749 } else if (force == 1) {
750 rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_local, ls);
751 } else {
752 rv = 0;
753 }
754 spin_unlock(&ls->ls_lkbidr_spin);
755 return rv;
756}
757
758static int release_lockspace(struct dlm_ls *ls, int force)
759{
760 struct dlm_rsb *rsb;
761 struct rb_node *n;
762 int i, busy, rv;
763
764 busy = lockspace_busy(ls, force);
765
766 spin_lock(&lslist_lock);
767 if (ls->ls_create_count == 1) {
768 if (busy) {
769 rv = -EBUSY;
770 } else {
771 /* remove_lockspace takes ls off lslist */
772 ls->ls_create_count = 0;
773 rv = 0;
774 }
775 } else if (ls->ls_create_count > 1) {
776 rv = --ls->ls_create_count;
777 } else {
778 rv = -EINVAL;
779 }
780 spin_unlock(&lslist_lock);
781
782 if (rv) {
783 log_debug(ls, "release_lockspace no remove %d", rv);
784 return rv;
785 }
786
787 dlm_device_deregister(ls);
788
789 if (force < 3 && dlm_user_daemon_available())
790 do_uevent(ls, 0);
791
792 dlm_recoverd_stop(ls);
793
794 if (ls_count == 1) {
795 dlm_scand_stop();
796 dlm_midcomms_shutdown();
797 }
798
799 dlm_callback_stop(ls);
800
801 remove_lockspace(ls);
802
803 dlm_delete_debug_file(ls);
804
805 idr_destroy(&ls->ls_recover_idr);
806 kfree(ls->ls_recover_buf);
807
808 /*
809 * Free all lkb's in idr
810 */
811
812 idr_for_each(&ls->ls_lkbidr, lkb_idr_free, ls);
813 idr_destroy(&ls->ls_lkbidr);
814
815 /*
816 * Free all rsb's on rsbtbl[] lists
817 */
818
819 for (i = 0; i < ls->ls_rsbtbl_size; i++) {
820 while ((n = rb_first(&ls->ls_rsbtbl[i].keep))) {
821 rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
822 rb_erase(n, &ls->ls_rsbtbl[i].keep);
823 dlm_free_rsb(rsb);
824 }
825
826 while ((n = rb_first(&ls->ls_rsbtbl[i].toss))) {
827 rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
828 rb_erase(n, &ls->ls_rsbtbl[i].toss);
829 dlm_free_rsb(rsb);
830 }
831 }
832
833 vfree(ls->ls_rsbtbl);
834
835 for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++)
836 kfree(ls->ls_remove_names[i]);
837
838 while (!list_empty(&ls->ls_new_rsb)) {
839 rsb = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb,
840 res_hashchain);
841 list_del(&rsb->res_hashchain);
842 dlm_free_rsb(rsb);
843 }
844
845 /*
846 * Free structures on any other lists
847 */
848
849 dlm_purge_requestqueue(ls);
850 kfree(ls->ls_recover_args);
851 dlm_clear_members(ls);
852 dlm_clear_members_gone(ls);
853 kfree(ls->ls_node_array);
854 log_rinfo(ls, "release_lockspace final free");
855 kobject_put(&ls->ls_kobj);
856 /* The ls structure will be freed when the kobject is done with */
857
858 module_put(THIS_MODULE);
859 return 0;
860}
861
862/*
863 * Called when a system has released all its locks and is not going to use the
864 * lockspace any longer. We free everything we're managing for this lockspace.
865 * Remaining nodes will go through the recovery process as if we'd died. The
866 * lockspace must continue to function as usual, participating in recoveries,
867 * until this returns.
868 *
869 * Force has 4 possible values:
870 * 0 - don't destroy locksapce if it has any LKBs
871 * 1 - destroy lockspace if it has remote LKBs but not if it has local LKBs
872 * 2 - destroy lockspace regardless of LKBs
873 * 3 - destroy lockspace as part of a forced shutdown
874 */
875
876int dlm_release_lockspace(void *lockspace, int force)
877{
878 struct dlm_ls *ls;
879 int error;
880
881 ls = dlm_find_lockspace_local(lockspace);
882 if (!ls)
883 return -EINVAL;
884 dlm_put_lockspace(ls);
885
886 mutex_lock(&ls_lock);
887 error = release_lockspace(ls, force);
888 if (!error)
889 ls_count--;
890 if (!ls_count)
891 dlm_lowcomms_stop();
892 mutex_unlock(&ls_lock);
893
894 return error;
895}
896
897void dlm_stop_lockspaces(void)
898{
899 struct dlm_ls *ls;
900 int count;
901
902 restart:
903 count = 0;
904 spin_lock(&lslist_lock);
905 list_for_each_entry(ls, &lslist, ls_list) {
906 if (!test_bit(LSFL_RUNNING, &ls->ls_flags)) {
907 count++;
908 continue;
909 }
910 spin_unlock(&lslist_lock);
911 log_error(ls, "no userland control daemon, stopping lockspace");
912 dlm_ls_stop(ls);
913 goto restart;
914 }
915 spin_unlock(&lslist_lock);
916
917 if (count)
918 log_print("dlm user daemon left %d lockspaces", count);
919}
920