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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 void 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 seq_puts(s, "\n");
72}
73
74static void 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
79 lock_rsb(res);
80
81 seq_printf(s, "\nResource %p Name (len=%d) \"", res, res->res_length);
82
83 for (i = 0; i < res->res_length; i++) {
84 if (isprint(res->res_name[i]))
85 seq_printf(s, "%c", res->res_name[i]);
86 else
87 seq_printf(s, "%c", '.');
88 }
89
90 if (res->res_nodeid > 0)
91 seq_printf(s, "\"\nLocal Copy, Master is node %d\n",
92 res->res_nodeid);
93 else if (res->res_nodeid == 0)
94 seq_puts(s, "\"\nMaster Copy\n");
95 else if (res->res_nodeid == -1)
96 seq_printf(s, "\"\nLooking up master (lkid %x)\n",
97 res->res_first_lkid);
98 else
99 seq_printf(s, "\"\nInvalid master %d\n", res->res_nodeid);
100 if (seq_has_overflowed(s))
101 goto out;
102
103
104 if (res->res_lvbptr) {
105 seq_puts(s, "LVB: ");
106 for (i = 0; i < lvblen; i++) {
107 if (i == lvblen / 2)
108 seq_puts(s, "\n ");
109 seq_printf(s, "%02x ",
110 (unsigned char) res->res_lvbptr[i]);
111 }
112 if (rsb_flag(res, RSB_VALNOTVALID))
113 seq_puts(s, " (INVALID)");
114 seq_puts(s, "\n");
115 if (seq_has_overflowed(s))
116 goto out;
117 }
118
119 root_list = !list_empty(&res->res_root_list);
120 recover_list = !list_empty(&res->res_recover_list);
121
122 if (root_list || recover_list) {
123 seq_printf(s, "Recovery: root %d recover %d flags %lx count %d\n",
124 root_list, recover_list,
125 res->res_flags, res->res_recover_locks_count);
126 }
127
128
129 seq_puts(s, "Granted Queue\n");
130 list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue) {
131 print_format1_lock(s, lkb, res);
132 if (seq_has_overflowed(s))
133 goto out;
134 }
135
136 seq_puts(s, "Conversion Queue\n");
137 list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue) {
138 print_format1_lock(s, lkb, res);
139 if (seq_has_overflowed(s))
140 goto out;
141 }
142
143 seq_puts(s, "Waiting Queue\n");
144 list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue) {
145 print_format1_lock(s, lkb, res);
146 if (seq_has_overflowed(s))
147 goto out;
148 }
149
150 if (list_empty(&res->res_lookup))
151 goto out;
152
153 seq_puts(s, "Lookup Queue\n");
154 list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) {
155 seq_printf(s, "%08x %s",
156 lkb->lkb_id, print_lockmode(lkb->lkb_rqmode));
157 if (lkb->lkb_wait_type)
158 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
159 seq_puts(s, "\n");
160 if (seq_has_overflowed(s))
161 goto out;
162 }
163 out:
164 unlock_rsb(res);
165}
166
167static void print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
168 struct dlm_rsb *r)
169{
170 u64 xid = 0;
171 u64 us;
172
173 if (lkb->lkb_flags & DLM_IFL_USER) {
174 if (lkb->lkb_ua)
175 xid = lkb->lkb_ua->xid;
176 }
177
178
179 us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp));
180
181
182
183
184 seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
185 lkb->lkb_id,
186 lkb->lkb_nodeid,
187 lkb->lkb_remid,
188 lkb->lkb_ownpid,
189 (unsigned long long)xid,
190 lkb->lkb_exflags,
191 lkb->lkb_flags,
192 lkb->lkb_status,
193 lkb->lkb_grmode,
194 lkb->lkb_rqmode,
195 (unsigned long long)us,
196 r->res_nodeid,
197 r->res_length,
198 r->res_name);
199}
200
201static void print_format2(struct dlm_rsb *r, struct seq_file *s)
202{
203 struct dlm_lkb *lkb;
204
205 lock_rsb(r);
206
207 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
208 print_format2_lock(s, lkb, r);
209 if (seq_has_overflowed(s))
210 goto out;
211 }
212
213 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
214 print_format2_lock(s, lkb, r);
215 if (seq_has_overflowed(s))
216 goto out;
217 }
218
219 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
220 print_format2_lock(s, lkb, r);
221 if (seq_has_overflowed(s))
222 goto out;
223 }
224 out:
225 unlock_rsb(r);
226}
227
228static void print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
229 int rsb_lookup)
230{
231 u64 xid = 0;
232
233 if (lkb->lkb_flags & DLM_IFL_USER) {
234 if (lkb->lkb_ua)
235 xid = lkb->lkb_ua->xid;
236 }
237
238 seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
239 lkb->lkb_id,
240 lkb->lkb_nodeid,
241 lkb->lkb_remid,
242 lkb->lkb_ownpid,
243 (unsigned long long)xid,
244 lkb->lkb_exflags,
245 lkb->lkb_flags,
246 lkb->lkb_status,
247 lkb->lkb_grmode,
248 lkb->lkb_rqmode,
249 lkb->lkb_last_bast.mode,
250 rsb_lookup,
251 lkb->lkb_wait_type,
252 lkb->lkb_lvbseq,
253 (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
254 (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time));
255}
256
257static void print_format3(struct dlm_rsb *r, struct seq_file *s)
258{
259 struct dlm_lkb *lkb;
260 int i, lvblen = r->res_ls->ls_lvblen;
261 int print_name = 1;
262
263 lock_rsb(r);
264
265 seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
266 r,
267 r->res_nodeid,
268 r->res_first_lkid,
269 r->res_flags,
270 !list_empty(&r->res_root_list),
271 !list_empty(&r->res_recover_list),
272 r->res_recover_locks_count,
273 r->res_length);
274 if (seq_has_overflowed(s))
275 goto out;
276
277 for (i = 0; i < r->res_length; i++) {
278 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
279 print_name = 0;
280 }
281
282 seq_puts(s, print_name ? "str " : "hex");
283
284 for (i = 0; i < r->res_length; i++) {
285 if (print_name)
286 seq_printf(s, "%c", r->res_name[i]);
287 else
288 seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
289 }
290 seq_puts(s, "\n");
291 if (seq_has_overflowed(s))
292 goto out;
293
294 if (!r->res_lvbptr)
295 goto do_locks;
296
297 seq_printf(s, "lvb %u %d", r->res_lvbseq, lvblen);
298
299 for (i = 0; i < lvblen; i++)
300 seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]);
301 seq_puts(s, "\n");
302 if (seq_has_overflowed(s))
303 goto out;
304
305 do_locks:
306 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
307 print_format3_lock(s, lkb, 0);
308 if (seq_has_overflowed(s))
309 goto out;
310 }
311
312 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
313 print_format3_lock(s, lkb, 0);
314 if (seq_has_overflowed(s))
315 goto out;
316 }
317
318 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
319 print_format3_lock(s, lkb, 0);
320 if (seq_has_overflowed(s))
321 goto out;
322 }
323
324 list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) {
325 print_format3_lock(s, lkb, 1);
326 if (seq_has_overflowed(s))
327 goto out;
328 }
329 out:
330 unlock_rsb(r);
331}
332
333static void print_format4(struct dlm_rsb *r, struct seq_file *s)
334{
335 int our_nodeid = dlm_our_nodeid();
336 int print_name = 1;
337 int i;
338
339 lock_rsb(r);
340
341 seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ",
342 r,
343 r->res_nodeid,
344 r->res_master_nodeid,
345 r->res_dir_nodeid,
346 our_nodeid,
347 r->res_toss_time,
348 r->res_flags,
349 r->res_length);
350
351 for (i = 0; i < r->res_length; i++) {
352 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
353 print_name = 0;
354 }
355
356 seq_puts(s, print_name ? "str " : "hex");
357
358 for (i = 0; i < r->res_length; i++) {
359 if (print_name)
360 seq_printf(s, "%c", r->res_name[i]);
361 else
362 seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
363 }
364 seq_puts(s, "\n");
365
366 unlock_rsb(r);
367}
368
369struct rsbtbl_iter {
370 struct dlm_rsb *rsb;
371 unsigned bucket;
372 int format;
373 int header;
374};
375
376
377
378
379
380
381
382
383static int table_seq_show(struct seq_file *seq, void *iter_ptr)
384{
385 struct rsbtbl_iter *ri = iter_ptr;
386
387 switch (ri->format) {
388 case 1:
389 print_format1(ri->rsb, seq);
390 break;
391 case 2:
392 if (ri->header) {
393 seq_puts(seq, "id nodeid remid pid xid exflags flags sts grmode rqmode time_ms r_nodeid r_len r_name\n");
394 ri->header = 0;
395 }
396 print_format2(ri->rsb, seq);
397 break;
398 case 3:
399 if (ri->header) {
400 seq_puts(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
401 ri->header = 0;
402 }
403 print_format3(ri->rsb, seq);
404 break;
405 case 4:
406 if (ri->header) {
407 seq_puts(seq, "version 4 rsb 2\n");
408 ri->header = 0;
409 }
410 print_format4(ri->rsb, seq);
411 break;
412 }
413
414 return 0;
415}
416
417static const struct seq_operations format1_seq_ops;
418static const struct seq_operations format2_seq_ops;
419static const struct seq_operations format3_seq_ops;
420static const struct seq_operations format4_seq_ops;
421
422static void *table_seq_start(struct seq_file *seq, loff_t *pos)
423{
424 struct rb_root *tree;
425 struct rb_node *node;
426 struct dlm_ls *ls = seq->private;
427 struct rsbtbl_iter *ri;
428 struct dlm_rsb *r;
429 loff_t n = *pos;
430 unsigned bucket, entry;
431 int toss = (seq->op == &format4_seq_ops);
432
433 bucket = n >> 32;
434 entry = n & ((1LL << 32) - 1);
435
436 if (bucket >= ls->ls_rsbtbl_size)
437 return NULL;
438
439 ri = kzalloc(sizeof(struct rsbtbl_iter), GFP_NOFS);
440 if (!ri)
441 return NULL;
442 if (n == 0)
443 ri->header = 1;
444 if (seq->op == &format1_seq_ops)
445 ri->format = 1;
446 if (seq->op == &format2_seq_ops)
447 ri->format = 2;
448 if (seq->op == &format3_seq_ops)
449 ri->format = 3;
450 if (seq->op == &format4_seq_ops)
451 ri->format = 4;
452
453 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
454
455 spin_lock(&ls->ls_rsbtbl[bucket].lock);
456 if (!RB_EMPTY_ROOT(tree)) {
457 for (node = rb_first(tree); node; node = rb_next(node)) {
458 r = rb_entry(node, struct dlm_rsb, res_hashnode);
459 if (!entry--) {
460 dlm_hold_rsb(r);
461 ri->rsb = r;
462 ri->bucket = bucket;
463 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
464 return ri;
465 }
466 }
467 }
468 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
469
470
471
472
473
474
475 n &= ~((1LL << 32) - 1);
476
477 while (1) {
478 bucket++;
479 n += 1LL << 32;
480
481 if (bucket >= ls->ls_rsbtbl_size) {
482 kfree(ri);
483 return NULL;
484 }
485 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
486
487 spin_lock(&ls->ls_rsbtbl[bucket].lock);
488 if (!RB_EMPTY_ROOT(tree)) {
489 node = rb_first(tree);
490 r = rb_entry(node, struct dlm_rsb, res_hashnode);
491 dlm_hold_rsb(r);
492 ri->rsb = r;
493 ri->bucket = bucket;
494 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
495 *pos = n;
496 return ri;
497 }
498 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
499 }
500}
501
502static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
503{
504 struct dlm_ls *ls = seq->private;
505 struct rsbtbl_iter *ri = iter_ptr;
506 struct rb_root *tree;
507 struct rb_node *next;
508 struct dlm_rsb *r, *rp;
509 loff_t n = *pos;
510 unsigned bucket;
511 int toss = (seq->op == &format4_seq_ops);
512
513 bucket = n >> 32;
514
515
516
517
518
519 spin_lock(&ls->ls_rsbtbl[bucket].lock);
520 rp = ri->rsb;
521 next = rb_next(&rp->res_hashnode);
522
523 if (next) {
524 r = rb_entry(next, struct dlm_rsb, res_hashnode);
525 dlm_hold_rsb(r);
526 ri->rsb = r;
527 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
528 dlm_put_rsb(rp);
529 ++*pos;
530 return ri;
531 }
532 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
533 dlm_put_rsb(rp);
534
535
536
537
538
539
540 n &= ~((1LL << 32) - 1);
541
542 while (1) {
543 bucket++;
544 n += 1LL << 32;
545
546 if (bucket >= ls->ls_rsbtbl_size) {
547 kfree(ri);
548 return NULL;
549 }
550 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
551
552 spin_lock(&ls->ls_rsbtbl[bucket].lock);
553 if (!RB_EMPTY_ROOT(tree)) {
554 next = rb_first(tree);
555 r = rb_entry(next, struct dlm_rsb, res_hashnode);
556 dlm_hold_rsb(r);
557 ri->rsb = r;
558 ri->bucket = bucket;
559 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
560 *pos = n;
561 return ri;
562 }
563 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
564 }
565}
566
567static void table_seq_stop(struct seq_file *seq, void *iter_ptr)
568{
569 struct rsbtbl_iter *ri = iter_ptr;
570
571 if (ri) {
572 dlm_put_rsb(ri->rsb);
573 kfree(ri);
574 }
575}
576
577static const struct seq_operations format1_seq_ops = {
578 .start = table_seq_start,
579 .next = table_seq_next,
580 .stop = table_seq_stop,
581 .show = table_seq_show,
582};
583
584static const struct seq_operations format2_seq_ops = {
585 .start = table_seq_start,
586 .next = table_seq_next,
587 .stop = table_seq_stop,
588 .show = table_seq_show,
589};
590
591static const struct seq_operations format3_seq_ops = {
592 .start = table_seq_start,
593 .next = table_seq_next,
594 .stop = table_seq_stop,
595 .show = table_seq_show,
596};
597
598static const struct seq_operations format4_seq_ops = {
599 .start = table_seq_start,
600 .next = table_seq_next,
601 .stop = table_seq_stop,
602 .show = table_seq_show,
603};
604
605static const struct file_operations format1_fops;
606static const struct file_operations format2_fops;
607static const struct file_operations format3_fops;
608static const struct file_operations format4_fops;
609
610static int table_open1(struct inode *inode, struct file *file)
611{
612 struct seq_file *seq;
613 int ret;
614
615 ret = seq_open(file, &format1_seq_ops);
616 if (ret)
617 return ret;
618
619 seq = file->private_data;
620 seq->private = inode->i_private;
621 return 0;
622}
623
624static int table_open2(struct inode *inode, struct file *file)
625{
626 struct seq_file *seq;
627 int ret;
628
629 ret = seq_open(file, &format2_seq_ops);
630 if (ret)
631 return ret;
632
633 seq = file->private_data;
634 seq->private = inode->i_private;
635 return 0;
636}
637
638static int table_open3(struct inode *inode, struct file *file)
639{
640 struct seq_file *seq;
641 int ret;
642
643 ret = seq_open(file, &format3_seq_ops);
644 if (ret)
645 return ret;
646
647 seq = file->private_data;
648 seq->private = inode->i_private;
649 return 0;
650}
651
652static int table_open4(struct inode *inode, struct file *file)
653{
654 struct seq_file *seq;
655 int ret;
656
657 ret = seq_open(file, &format4_seq_ops);
658 if (ret)
659 return ret;
660
661 seq = file->private_data;
662 seq->private = inode->i_private;
663 return 0;
664}
665
666static const struct file_operations format1_fops = {
667 .owner = THIS_MODULE,
668 .open = table_open1,
669 .read = seq_read,
670 .llseek = seq_lseek,
671 .release = seq_release
672};
673
674static const struct file_operations format2_fops = {
675 .owner = THIS_MODULE,
676 .open = table_open2,
677 .read = seq_read,
678 .llseek = seq_lseek,
679 .release = seq_release
680};
681
682static const struct file_operations format3_fops = {
683 .owner = THIS_MODULE,
684 .open = table_open3,
685 .read = seq_read,
686 .llseek = seq_lseek,
687 .release = seq_release
688};
689
690static const struct file_operations format4_fops = {
691 .owner = THIS_MODULE,
692 .open = table_open4,
693 .read = seq_read,
694 .llseek = seq_lseek,
695 .release = seq_release
696};
697
698
699
700
701static ssize_t waiters_read(struct file *file, char __user *userbuf,
702 size_t count, loff_t *ppos)
703{
704 struct dlm_ls *ls = file->private_data;
705 struct dlm_lkb *lkb;
706 size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv;
707
708 mutex_lock(&debug_buf_lock);
709 mutex_lock(&ls->ls_waiters_mutex);
710 memset(debug_buf, 0, sizeof(debug_buf));
711
712 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
713 ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n",
714 lkb->lkb_id, lkb->lkb_wait_type,
715 lkb->lkb_nodeid, lkb->lkb_resource->res_name);
716 if (ret >= len - pos)
717 break;
718 pos += ret;
719 }
720 mutex_unlock(&ls->ls_waiters_mutex);
721
722 rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos);
723 mutex_unlock(&debug_buf_lock);
724 return rv;
725}
726
727static const struct file_operations waiters_fops = {
728 .owner = THIS_MODULE,
729 .open = simple_open,
730 .read = waiters_read,
731 .llseek = default_llseek,
732};
733
734void dlm_delete_debug_file(struct dlm_ls *ls)
735{
736 debugfs_remove(ls->ls_debug_rsb_dentry);
737 debugfs_remove(ls->ls_debug_waiters_dentry);
738 debugfs_remove(ls->ls_debug_locks_dentry);
739 debugfs_remove(ls->ls_debug_all_dentry);
740 debugfs_remove(ls->ls_debug_toss_dentry);
741}
742
743int dlm_create_debug_file(struct dlm_ls *ls)
744{
745 char name[DLM_LOCKSPACE_LEN+8];
746
747
748
749 ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
750 S_IFREG | S_IRUGO,
751 dlm_root,
752 ls,
753 &format1_fops);
754 if (!ls->ls_debug_rsb_dentry)
755 goto fail;
756
757
758
759 memset(name, 0, sizeof(name));
760 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_locks", ls->ls_name);
761
762 ls->ls_debug_locks_dentry = debugfs_create_file(name,
763 S_IFREG | S_IRUGO,
764 dlm_root,
765 ls,
766 &format2_fops);
767 if (!ls->ls_debug_locks_dentry)
768 goto fail;
769
770
771
772 memset(name, 0, sizeof(name));
773 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_all", ls->ls_name);
774
775 ls->ls_debug_all_dentry = debugfs_create_file(name,
776 S_IFREG | S_IRUGO,
777 dlm_root,
778 ls,
779 &format3_fops);
780 if (!ls->ls_debug_all_dentry)
781 goto fail;
782
783
784
785 memset(name, 0, sizeof(name));
786 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_toss", ls->ls_name);
787
788 ls->ls_debug_toss_dentry = debugfs_create_file(name,
789 S_IFREG | S_IRUGO,
790 dlm_root,
791 ls,
792 &format4_fops);
793 if (!ls->ls_debug_toss_dentry)
794 goto fail;
795
796 memset(name, 0, sizeof(name));
797 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name);
798
799 ls->ls_debug_waiters_dentry = debugfs_create_file(name,
800 S_IFREG | S_IRUGO,
801 dlm_root,
802 ls,
803 &waiters_fops);
804 if (!ls->ls_debug_waiters_dentry)
805 goto fail;
806
807 return 0;
808
809 fail:
810 dlm_delete_debug_file(ls);
811 return -ENOMEM;
812}
813
814int __init dlm_register_debugfs(void)
815{
816 mutex_init(&debug_buf_lock);
817 dlm_root = debugfs_create_dir("dlm", NULL);
818 return dlm_root ? 0 : -ENOMEM;
819}
820
821void dlm_unregister_debugfs(void)
822{
823 debugfs_remove(dlm_root);
824}
825
826
