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13#include <linux/pagemap.h>
14#include <linux/seq_file.h>
15#include <linux/module.h>
16#include <linux/ctype.h>
17#include <linux/debugfs.h>
18#include <linux/slab.h>
19
20#include "dlm_internal.h"
21#include "lock.h"
22
23#define DLM_DEBUG_BUF_LEN 4096
24static char debug_buf[DLM_DEBUG_BUF_LEN];
25static struct mutex debug_buf_lock;
26
27static struct dentry *dlm_root;
28
29static char *print_lockmode(int mode)
30{
31 switch (mode) {
32 case DLM_LOCK_IV:
33 return "--";
34 case DLM_LOCK_NL:
35 return "NL";
36 case DLM_LOCK_CR:
37 return "CR";
38 case DLM_LOCK_CW:
39 return "CW";
40 case DLM_LOCK_PR:
41 return "PR";
42 case DLM_LOCK_PW:
43 return "PW";
44 case DLM_LOCK_EX:
45 return "EX";
46 default:
47 return "??";
48 }
49}
50
51static int print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
52 struct dlm_rsb *res)
53{
54 seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
55
56 if (lkb->lkb_status == DLM_LKSTS_CONVERT ||
57 lkb->lkb_status == DLM_LKSTS_WAITING)
58 seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode));
59
60 if (lkb->lkb_nodeid) {
61 if (lkb->lkb_nodeid != res->res_nodeid)
62 seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid,
63 lkb->lkb_remid);
64 else
65 seq_printf(s, " Master: %08x", lkb->lkb_remid);
66 }
67
68 if (lkb->lkb_wait_type)
69 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
70
71 return seq_printf(s, "\n");
72}
73
74static int print_format1(struct dlm_rsb *res, struct seq_file *s)
75{
76 struct dlm_lkb *lkb;
77 int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
78 int rv;
79
80 lock_rsb(res);
81
82 rv = seq_printf(s, "\nResource %p Name (len=%d) \"",
83 res, res->res_length);
84 if (rv)
85 goto out;
86
87 for (i = 0; i < res->res_length; i++) {
88 if (isprint(res->res_name[i]))
89 seq_printf(s, "%c", res->res_name[i]);
90 else
91 seq_printf(s, "%c", '.');
92 }
93
94 if (res->res_nodeid > 0)
95 rv = seq_printf(s, "\" \nLocal Copy, Master is node %d\n",
96 res->res_nodeid);
97 else if (res->res_nodeid == 0)
98 rv = seq_printf(s, "\" \nMaster Copy\n");
99 else if (res->res_nodeid == -1)
100 rv = seq_printf(s, "\" \nLooking up master (lkid %x)\n",
101 res->res_first_lkid);
102 else
103 rv = seq_printf(s, "\" \nInvalid master %d\n",
104 res->res_nodeid);
105 if (rv)
106 goto out;
107
108
109 if (res->res_lvbptr) {
110 seq_printf(s, "LVB: ");
111 for (i = 0; i < lvblen; i++) {
112 if (i == lvblen / 2)
113 seq_printf(s, "\n ");
114 seq_printf(s, "%02x ",
115 (unsigned char) res->res_lvbptr[i]);
116 }
117 if (rsb_flag(res, RSB_VALNOTVALID))
118 seq_printf(s, " (INVALID)");
119 rv = seq_printf(s, "\n");
120 if (rv)
121 goto out;
122 }
123
124 root_list = !list_empty(&res->res_root_list);
125 recover_list = !list_empty(&res->res_recover_list);
126
127 if (root_list || recover_list) {
128 rv = seq_printf(s, "Recovery: root %d recover %d flags %lx "
129 "count %d\n", root_list, recover_list,
130 res->res_flags, res->res_recover_locks_count);
131 if (rv)
132 goto out;
133 }
134
135
136 seq_printf(s, "Granted Queue\n");
137 list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue) {
138 rv = print_format1_lock(s, lkb, res);
139 if (rv)
140 goto out;
141 }
142
143 seq_printf(s, "Conversion Queue\n");
144 list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue) {
145 rv = print_format1_lock(s, lkb, res);
146 if (rv)
147 goto out;
148 }
149
150 seq_printf(s, "Waiting Queue\n");
151 list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue) {
152 rv = print_format1_lock(s, lkb, res);
153 if (rv)
154 goto out;
155 }
156
157 if (list_empty(&res->res_lookup))
158 goto out;
159
160 seq_printf(s, "Lookup Queue\n");
161 list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) {
162 rv = seq_printf(s, "%08x %s", lkb->lkb_id,
163 print_lockmode(lkb->lkb_rqmode));
164 if (lkb->lkb_wait_type)
165 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
166 rv = seq_printf(s, "\n");
167 }
168 out:
169 unlock_rsb(res);
170 return rv;
171}
172
173static int print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
174 struct dlm_rsb *r)
175{
176 u64 xid = 0;
177 u64 us;
178 int rv;
179
180 if (lkb->lkb_flags & DLM_IFL_USER) {
181 if (lkb->lkb_ua)
182 xid = lkb->lkb_ua->xid;
183 }
184
185
186 us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp));
187
188
189
190
191 rv = seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
192 lkb->lkb_id,
193 lkb->lkb_nodeid,
194 lkb->lkb_remid,
195 lkb->lkb_ownpid,
196 (unsigned long long)xid,
197 lkb->lkb_exflags,
198 lkb->lkb_flags,
199 lkb->lkb_status,
200 lkb->lkb_grmode,
201 lkb->lkb_rqmode,
202 (unsigned long long)us,
203 r->res_nodeid,
204 r->res_length,
205 r->res_name);
206 return rv;
207}
208
209static int print_format2(struct dlm_rsb *r, struct seq_file *s)
210{
211 struct dlm_lkb *lkb;
212 int rv = 0;
213
214 lock_rsb(r);
215
216 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
217 rv = print_format2_lock(s, lkb, r);
218 if (rv)
219 goto out;
220 }
221
222 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
223 rv = print_format2_lock(s, lkb, r);
224 if (rv)
225 goto out;
226 }
227
228 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
229 rv = print_format2_lock(s, lkb, r);
230 if (rv)
231 goto out;
232 }
233 out:
234 unlock_rsb(r);
235 return rv;
236}
237
238static int print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
239 int rsb_lookup)
240{
241 u64 xid = 0;
242 int rv;
243
244 if (lkb->lkb_flags & DLM_IFL_USER) {
245 if (lkb->lkb_ua)
246 xid = lkb->lkb_ua->xid;
247 }
248
249 rv = seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
250 lkb->lkb_id,
251 lkb->lkb_nodeid,
252 lkb->lkb_remid,
253 lkb->lkb_ownpid,
254 (unsigned long long)xid,
255 lkb->lkb_exflags,
256 lkb->lkb_flags,
257 lkb->lkb_status,
258 lkb->lkb_grmode,
259 lkb->lkb_rqmode,
260 lkb->lkb_last_bast.mode,
261 rsb_lookup,
262 lkb->lkb_wait_type,
263 lkb->lkb_lvbseq,
264 (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
265 (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time));
266 return rv;
267}
268
269static int print_format3(struct dlm_rsb *r, struct seq_file *s)
270{
271 struct dlm_lkb *lkb;
272 int i, lvblen = r->res_ls->ls_lvblen;
273 int print_name = 1;
274 int rv;
275
276 lock_rsb(r);
277
278 rv = seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
279 r,
280 r->res_nodeid,
281 r->res_first_lkid,
282 r->res_flags,
283 !list_empty(&r->res_root_list),
284 !list_empty(&r->res_recover_list),
285 r->res_recover_locks_count,
286 r->res_length);
287 if (rv)
288 goto out;
289
290 for (i = 0; i < r->res_length; i++) {
291 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
292 print_name = 0;
293 }
294
295 seq_printf(s, "%s", print_name ? "str " : "hex");
296
297 for (i = 0; i < r->res_length; i++) {
298 if (print_name)
299 seq_printf(s, "%c", r->res_name[i]);
300 else
301 seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
302 }
303 rv = seq_printf(s, "\n");
304 if (rv)
305 goto out;
306
307 if (!r->res_lvbptr)
308 goto do_locks;
309
310 seq_printf(s, "lvb %u %d", r->res_lvbseq, lvblen);
311
312 for (i = 0; i < lvblen; i++)
313 seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]);
314 rv = seq_printf(s, "\n");
315 if (rv)
316 goto out;
317
318 do_locks:
319 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
320 rv = print_format3_lock(s, lkb, 0);
321 if (rv)
322 goto out;
323 }
324
325 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
326 rv = print_format3_lock(s, lkb, 0);
327 if (rv)
328 goto out;
329 }
330
331 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
332 rv = print_format3_lock(s, lkb, 0);
333 if (rv)
334 goto out;
335 }
336
337 list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) {
338 rv = print_format3_lock(s, lkb, 1);
339 if (rv)
340 goto out;
341 }
342 out:
343 unlock_rsb(r);
344 return rv;
345}
346
347static int print_format4(struct dlm_rsb *r, struct seq_file *s)
348{
349 int our_nodeid = dlm_our_nodeid();
350 int print_name = 1;
351 int i, rv;
352
353 lock_rsb(r);
354
355 rv = seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ",
356 r,
357 r->res_nodeid,
358 r->res_master_nodeid,
359 r->res_dir_nodeid,
360 our_nodeid,
361 r->res_toss_time,
362 r->res_flags,
363 r->res_length);
364 if (rv)
365 goto out;
366
367 for (i = 0; i < r->res_length; i++) {
368 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
369 print_name = 0;
370 }
371
372 seq_printf(s, "%s", print_name ? "str " : "hex");
373
374 for (i = 0; i < r->res_length; i++) {
375 if (print_name)
376 seq_printf(s, "%c", r->res_name[i]);
377 else
378 seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
379 }
380 rv = seq_printf(s, "\n");
381 out:
382 unlock_rsb(r);
383 return rv;
384}
385
386struct rsbtbl_iter {
387 struct dlm_rsb *rsb;
388 unsigned bucket;
389 int format;
390 int header;
391};
392
393
394
395
396
397
398
399static int table_seq_show(struct seq_file *seq, void *iter_ptr)
400{
401 struct rsbtbl_iter *ri = iter_ptr;
402 int rv = 0;
403
404 switch (ri->format) {
405 case 1:
406 rv = print_format1(ri->rsb, seq);
407 break;
408 case 2:
409 if (ri->header) {
410 seq_printf(seq, "id nodeid remid pid xid exflags "
411 "flags sts grmode rqmode time_ms "
412 "r_nodeid r_len r_name\n");
413 ri->header = 0;
414 }
415 rv = print_format2(ri->rsb, seq);
416 break;
417 case 3:
418 if (ri->header) {
419 seq_printf(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
420 ri->header = 0;
421 }
422 rv = print_format3(ri->rsb, seq);
423 break;
424 case 4:
425 if (ri->header) {
426 seq_printf(seq, "version 4 rsb 2\n");
427 ri->header = 0;
428 }
429 rv = print_format4(ri->rsb, seq);
430 break;
431 }
432
433 return rv;
434}
435
436static const struct seq_operations format1_seq_ops;
437static const struct seq_operations format2_seq_ops;
438static const struct seq_operations format3_seq_ops;
439static const struct seq_operations format4_seq_ops;
440
441static void *table_seq_start(struct seq_file *seq, loff_t *pos)
442{
443 struct rb_root *tree;
444 struct rb_node *node;
445 struct dlm_ls *ls = seq->private;
446 struct rsbtbl_iter *ri;
447 struct dlm_rsb *r;
448 loff_t n = *pos;
449 unsigned bucket, entry;
450 int toss = (seq->op == &format4_seq_ops);
451
452 bucket = n >> 32;
453 entry = n & ((1LL << 32) - 1);
454
455 if (bucket >= ls->ls_rsbtbl_size)
456 return NULL;
457
458 ri = kzalloc(sizeof(struct rsbtbl_iter), GFP_NOFS);
459 if (!ri)
460 return NULL;
461 if (n == 0)
462 ri->header = 1;
463 if (seq->op == &format1_seq_ops)
464 ri->format = 1;
465 if (seq->op == &format2_seq_ops)
466 ri->format = 2;
467 if (seq->op == &format3_seq_ops)
468 ri->format = 3;
469 if (seq->op == &format4_seq_ops)
470 ri->format = 4;
471
472 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
473
474 spin_lock(&ls->ls_rsbtbl[bucket].lock);
475 if (!RB_EMPTY_ROOT(tree)) {
476 for (node = rb_first(tree); node; node = rb_next(node)) {
477 r = rb_entry(node, struct dlm_rsb, res_hashnode);
478 if (!entry--) {
479 dlm_hold_rsb(r);
480 ri->rsb = r;
481 ri->bucket = bucket;
482 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
483 return ri;
484 }
485 }
486 }
487 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
488
489
490
491
492
493
494 n &= ~((1LL << 32) - 1);
495
496 while (1) {
497 bucket++;
498 n += 1LL << 32;
499
500 if (bucket >= ls->ls_rsbtbl_size) {
501 kfree(ri);
502 return NULL;
503 }
504 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
505
506 spin_lock(&ls->ls_rsbtbl[bucket].lock);
507 if (!RB_EMPTY_ROOT(tree)) {
508 node = rb_first(tree);
509 r = rb_entry(node, struct dlm_rsb, res_hashnode);
510 dlm_hold_rsb(r);
511 ri->rsb = r;
512 ri->bucket = bucket;
513 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
514 *pos = n;
515 return ri;
516 }
517 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
518 }
519}
520
521static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
522{
523 struct dlm_ls *ls = seq->private;
524 struct rsbtbl_iter *ri = iter_ptr;
525 struct rb_root *tree;
526 struct rb_node *next;
527 struct dlm_rsb *r, *rp;
528 loff_t n = *pos;
529 unsigned bucket;
530 int toss = (seq->op == &format4_seq_ops);
531
532 bucket = n >> 32;
533
534
535
536
537
538 spin_lock(&ls->ls_rsbtbl[bucket].lock);
539 rp = ri->rsb;
540 next = rb_next(&rp->res_hashnode);
541
542 if (next) {
543 r = rb_entry(next, struct dlm_rsb, res_hashnode);
544 dlm_hold_rsb(r);
545 ri->rsb = r;
546 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
547 dlm_put_rsb(rp);
548 ++*pos;
549 return ri;
550 }
551 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
552 dlm_put_rsb(rp);
553
554
555
556
557
558
559 n &= ~((1LL << 32) - 1);
560
561 while (1) {
562 bucket++;
563 n += 1LL << 32;
564
565 if (bucket >= ls->ls_rsbtbl_size) {
566 kfree(ri);
567 return NULL;
568 }
569 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
570
571 spin_lock(&ls->ls_rsbtbl[bucket].lock);
572 if (!RB_EMPTY_ROOT(tree)) {
573 next = rb_first(tree);
574 r = rb_entry(next, struct dlm_rsb, res_hashnode);
575 dlm_hold_rsb(r);
576 ri->rsb = r;
577 ri->bucket = bucket;
578 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
579 *pos = n;
580 return ri;
581 }
582 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
583 }
584}
585
586static void table_seq_stop(struct seq_file *seq, void *iter_ptr)
587{
588 struct rsbtbl_iter *ri = iter_ptr;
589
590 if (ri) {
591 dlm_put_rsb(ri->rsb);
592 kfree(ri);
593 }
594}
595
596static const struct seq_operations format1_seq_ops = {
597 .start = table_seq_start,
598 .next = table_seq_next,
599 .stop = table_seq_stop,
600 .show = table_seq_show,
601};
602
603static const struct seq_operations format2_seq_ops = {
604 .start = table_seq_start,
605 .next = table_seq_next,
606 .stop = table_seq_stop,
607 .show = table_seq_show,
608};
609
610static const struct seq_operations format3_seq_ops = {
611 .start = table_seq_start,
612 .next = table_seq_next,
613 .stop = table_seq_stop,
614 .show = table_seq_show,
615};
616
617static const struct seq_operations format4_seq_ops = {
618 .start = table_seq_start,
619 .next = table_seq_next,
620 .stop = table_seq_stop,
621 .show = table_seq_show,
622};
623
624static const struct file_operations format1_fops;
625static const struct file_operations format2_fops;
626static const struct file_operations format3_fops;
627static const struct file_operations format4_fops;
628
629static int table_open(struct inode *inode, struct file *file)
630{
631 struct seq_file *seq;
632 int ret = -1;
633
634 if (file->f_op == &format1_fops)
635 ret = seq_open(file, &format1_seq_ops);
636 else if (file->f_op == &format2_fops)
637 ret = seq_open(file, &format2_seq_ops);
638 else if (file->f_op == &format3_fops)
639 ret = seq_open(file, &format3_seq_ops);
640 else if (file->f_op == &format4_fops)
641 ret = seq_open(file, &format4_seq_ops);
642
643 if (ret)
644 return ret;
645
646 seq = file->private_data;
647 seq->private = inode->i_private;
648 return 0;
649}
650
651static const struct file_operations format1_fops = {
652 .owner = THIS_MODULE,
653 .open = table_open,
654 .read = seq_read,
655 .llseek = seq_lseek,
656 .release = seq_release
657};
658
659static const struct file_operations format2_fops = {
660 .owner = THIS_MODULE,
661 .open = table_open,
662 .read = seq_read,
663 .llseek = seq_lseek,
664 .release = seq_release
665};
666
667static const struct file_operations format3_fops = {
668 .owner = THIS_MODULE,
669 .open = table_open,
670 .read = seq_read,
671 .llseek = seq_lseek,
672 .release = seq_release
673};
674
675static const struct file_operations format4_fops = {
676 .owner = THIS_MODULE,
677 .open = table_open,
678 .read = seq_read,
679 .llseek = seq_lseek,
680 .release = seq_release
681};
682
683
684
685
686static ssize_t waiters_read(struct file *file, char __user *userbuf,
687 size_t count, loff_t *ppos)
688{
689 struct dlm_ls *ls = file->private_data;
690 struct dlm_lkb *lkb;
691 size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv;
692
693 mutex_lock(&debug_buf_lock);
694 mutex_lock(&ls->ls_waiters_mutex);
695 memset(debug_buf, 0, sizeof(debug_buf));
696
697 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
698 ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n",
699 lkb->lkb_id, lkb->lkb_wait_type,
700 lkb->lkb_nodeid, lkb->lkb_resource->res_name);
701 if (ret >= len - pos)
702 break;
703 pos += ret;
704 }
705 mutex_unlock(&ls->ls_waiters_mutex);
706
707 rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos);
708 mutex_unlock(&debug_buf_lock);
709 return rv;
710}
711
712static const struct file_operations waiters_fops = {
713 .owner = THIS_MODULE,
714 .open = simple_open,
715 .read = waiters_read,
716 .llseek = default_llseek,
717};
718
719void dlm_delete_debug_file(struct dlm_ls *ls)
720{
721 if (ls->ls_debug_rsb_dentry)
722 debugfs_remove(ls->ls_debug_rsb_dentry);
723 if (ls->ls_debug_waiters_dentry)
724 debugfs_remove(ls->ls_debug_waiters_dentry);
725 if (ls->ls_debug_locks_dentry)
726 debugfs_remove(ls->ls_debug_locks_dentry);
727 if (ls->ls_debug_all_dentry)
728 debugfs_remove(ls->ls_debug_all_dentry);
729 if (ls->ls_debug_toss_dentry)
730 debugfs_remove(ls->ls_debug_toss_dentry);
731}
732
733int dlm_create_debug_file(struct dlm_ls *ls)
734{
735 char name[DLM_LOCKSPACE_LEN+8];
736
737
738
739 ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
740 S_IFREG | S_IRUGO,
741 dlm_root,
742 ls,
743 &format1_fops);
744 if (!ls->ls_debug_rsb_dentry)
745 goto fail;
746
747
748
749 memset(name, 0, sizeof(name));
750 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_locks", ls->ls_name);
751
752 ls->ls_debug_locks_dentry = debugfs_create_file(name,
753 S_IFREG | S_IRUGO,
754 dlm_root,
755 ls,
756 &format2_fops);
757 if (!ls->ls_debug_locks_dentry)
758 goto fail;
759
760
761
762 memset(name, 0, sizeof(name));
763 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_all", ls->ls_name);
764
765 ls->ls_debug_all_dentry = debugfs_create_file(name,
766 S_IFREG | S_IRUGO,
767 dlm_root,
768 ls,
769 &format3_fops);
770 if (!ls->ls_debug_all_dentry)
771 goto fail;
772
773
774
775 memset(name, 0, sizeof(name));
776 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_toss", ls->ls_name);
777
778 ls->ls_debug_toss_dentry = debugfs_create_file(name,
779 S_IFREG | S_IRUGO,
780 dlm_root,
781 ls,
782 &format4_fops);
783 if (!ls->ls_debug_toss_dentry)
784 goto fail;
785
786 memset(name, 0, sizeof(name));
787 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name);
788
789 ls->ls_debug_waiters_dentry = debugfs_create_file(name,
790 S_IFREG | S_IRUGO,
791 dlm_root,
792 ls,
793 &waiters_fops);
794 if (!ls->ls_debug_waiters_dentry)
795 goto fail;
796
797 return 0;
798
799 fail:
800 dlm_delete_debug_file(ls);
801 return -ENOMEM;
802}
803
804int __init dlm_register_debugfs(void)
805{
806 mutex_init(&debug_buf_lock);
807 dlm_root = debugfs_create_dir("dlm", NULL);
808 return dlm_root ? 0 : -ENOMEM;
809}
810
811void dlm_unregister_debugfs(void)
812{
813 debugfs_remove(dlm_root);
814}
815
816
