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mm/vmscan.c: prevent useless kswapd loops
[linux/fpc-iii.git] / fs / dlm / debug_fs.c
blobfa08448e35dd7dd50fedaae4b95e48e974d343c4
1 /******************************************************************************
2 *******************************************************************************
3 **
4 ** Copyright (C) 2005-2009 Red Hat, Inc. All rights reserved.
5 **
6 ** This copyrighted material is made available to anyone wishing to use,
7 ** modify, copy, or redistribute it subject to the terms and conditions
8 ** of the GNU General Public License v.2.
9 **
10 *******************************************************************************
11 ******************************************************************************/
12
13 #include <linux/pagemap.h>
14 #include <linux/seq_file.h>
15 #include <linux/init.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
24 static char debug_buf[DLM_DEBUG_BUF_LEN];
25 static struct mutex debug_buf_lock;
26
27 static struct dentry *dlm_root;
28
29 static 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
51 static 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_putc(s, '\n');
72 }
73
74 static 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 /* Print the LVB: */
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_putc(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 /* Print the locks attached to this resource */
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_putc(s, '\n');
160 if (seq_has_overflowed(s))
161 goto out;
162 }
163 out:
164 unlock_rsb(res);
165 }
166
167 static 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 /* microseconds since lkb was added to current queue */
179 us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp));
180
181 /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us
182 r_nodeid r_len r_name */
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
201 static 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
228 static 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
257 static 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_putc(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_putc(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
333 static 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_putc(s, '\n');
365 unlock_rsb(r);
366 }
367
368 struct rsbtbl_iter {
369 struct dlm_rsb *rsb;
370 unsigned bucket;
371 int format;
372 int header;
373 };
374
375 /*
376 * If the buffer is full, seq_printf can be called again, but it
377 * does nothing. So, the these printing routines periodically check
378 * seq_has_overflowed to avoid wasting too much time trying to print to
379 * a full buffer.
380 */
381
382 static int table_seq_show(struct seq_file *seq, void *iter_ptr)
383 {
384 struct rsbtbl_iter *ri = iter_ptr;
385
386 switch (ri->format) {
387 case 1:
388 print_format1(ri->rsb, seq);
389 break;
390 case 2:
391 if (ri->header) {
392 seq_puts(seq, "id nodeid remid pid xid exflags flags sts grmode rqmode time_ms r_nodeid r_len r_name\n");
393 ri->header = 0;
394 }
395 print_format2(ri->rsb, seq);
396 break;
397 case 3:
398 if (ri->header) {
399 seq_puts(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
400 ri->header = 0;
401 }
402 print_format3(ri->rsb, seq);
403 break;
404 case 4:
405 if (ri->header) {
406 seq_puts(seq, "version 4 rsb 2\n");
407 ri->header = 0;
408 }
409 print_format4(ri->rsb, seq);
410 break;
411 }
412
413 return 0;
414 }
415
416 static const struct seq_operations format1_seq_ops;
417 static const struct seq_operations format2_seq_ops;
418 static const struct seq_operations format3_seq_ops;
419 static const struct seq_operations format4_seq_ops;
420
421 static void *table_seq_start(struct seq_file *seq, loff_t *pos)
422 {
423 struct rb_root *tree;
424 struct rb_node *node;
425 struct dlm_ls *ls = seq->private;
426 struct rsbtbl_iter *ri;
427 struct dlm_rsb *r;
428 loff_t n = *pos;
429 unsigned bucket, entry;
430 int toss = (seq->op == &format4_seq_ops);
431
432 bucket = n >> 32;
433 entry = n & ((1LL << 32) - 1);
434
435 if (bucket >= ls->ls_rsbtbl_size)
436 return NULL;
437
438 ri = kzalloc(sizeof(*ri), GFP_NOFS);
439 if (!ri)
440 return NULL;
441 if (n == 0)
442 ri->header = 1;
443 if (seq->op == &format1_seq_ops)
444 ri->format = 1;
445 if (seq->op == &format2_seq_ops)
446 ri->format = 2;
447 if (seq->op == &format3_seq_ops)
448 ri->format = 3;
449 if (seq->op == &format4_seq_ops)
450 ri->format = 4;
451
452 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
453
454 spin_lock(&ls->ls_rsbtbl[bucket].lock);
455 if (!RB_EMPTY_ROOT(tree)) {
456 for (node = rb_first(tree); node; node = rb_next(node)) {
457 r = rb_entry(node, struct dlm_rsb, res_hashnode);
458 if (!entry--) {
459 dlm_hold_rsb(r);
460 ri->rsb = r;
461 ri->bucket = bucket;
462 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
463 return ri;
464 }
465 }
466 }
467 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
468
469 /*
470 * move to the first rsb in the next non-empty bucket
471 */
472
473 /* zero the entry */
474 n &= ~((1LL << 32) - 1);
475
476 while (1) {
477 bucket++;
478 n += 1LL << 32;
479
480 if (bucket >= ls->ls_rsbtbl_size) {
481 kfree(ri);
482 return NULL;
483 }
484 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
485
486 spin_lock(&ls->ls_rsbtbl[bucket].lock);
487 if (!RB_EMPTY_ROOT(tree)) {
488 node = rb_first(tree);
489 r = rb_entry(node, struct dlm_rsb, res_hashnode);
490 dlm_hold_rsb(r);
491 ri->rsb = r;
492 ri->bucket = bucket;
493 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
494 *pos = n;
495 return ri;
496 }
497 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
498 }
499 }
500
501 static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
502 {
503 struct dlm_ls *ls = seq->private;
504 struct rsbtbl_iter *ri = iter_ptr;
505 struct rb_root *tree;
506 struct rb_node *next;
507 struct dlm_rsb *r, *rp;
508 loff_t n = *pos;
509 unsigned bucket;
510 int toss = (seq->op == &format4_seq_ops);
511
512 bucket = n >> 32;
513
514 /*
515 * move to the next rsb in the same bucket
516 */
517
518 spin_lock(&ls->ls_rsbtbl[bucket].lock);
519 rp = ri->rsb;
520 next = rb_next(&rp->res_hashnode);
521
522 if (next) {
523 r = rb_entry(next, struct dlm_rsb, res_hashnode);
524 dlm_hold_rsb(r);
525 ri->rsb = r;
526 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
527 dlm_put_rsb(rp);
528 ++*pos;
529 return ri;
530 }
531 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
532 dlm_put_rsb(rp);
533
534 /*
535 * move to the first rsb in the next non-empty bucket
536 */
537
538 /* zero the entry */
539 n &= ~((1LL << 32) - 1);
540
541 while (1) {
542 bucket++;
543 n += 1LL << 32;
544
545 if (bucket >= ls->ls_rsbtbl_size) {
546 kfree(ri);
547 return NULL;
548 }
549 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
550
551 spin_lock(&ls->ls_rsbtbl[bucket].lock);
552 if (!RB_EMPTY_ROOT(tree)) {
553 next = rb_first(tree);
554 r = rb_entry(next, struct dlm_rsb, res_hashnode);
555 dlm_hold_rsb(r);
556 ri->rsb = r;
557 ri->bucket = bucket;
558 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
559 *pos = n;
560 return ri;
561 }
562 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
563 }
564 }
565
566 static void table_seq_stop(struct seq_file *seq, void *iter_ptr)
567 {
568 struct rsbtbl_iter *ri = iter_ptr;
569
570 if (ri) {
571 dlm_put_rsb(ri->rsb);
572 kfree(ri);
573 }
574 }
575
576 static const struct seq_operations format1_seq_ops = {
577 .start = table_seq_start,
578 .next = table_seq_next,
579 .stop = table_seq_stop,
580 .show = table_seq_show,
581 };
582
583 static const struct seq_operations format2_seq_ops = {
584 .start = table_seq_start,
585 .next = table_seq_next,
586 .stop = table_seq_stop,
587 .show = table_seq_show,
588 };
589
590 static const struct seq_operations format3_seq_ops = {
591 .start = table_seq_start,
592 .next = table_seq_next,
593 .stop = table_seq_stop,
594 .show = table_seq_show,
595 };
596
597 static const struct seq_operations format4_seq_ops = {
598 .start = table_seq_start,
599 .next = table_seq_next,
600 .stop = table_seq_stop,
601 .show = table_seq_show,
602 };
603
604 static const struct file_operations format1_fops;
605 static const struct file_operations format2_fops;
606 static const struct file_operations format3_fops;
607 static const struct file_operations format4_fops;
608
609 static int table_open1(struct inode *inode, struct file *file)
610 {
611 struct seq_file *seq;
612 int ret;
613
614 ret = seq_open(file, &format1_seq_ops);
615 if (ret)
616 return ret;
617
618 seq = file->private_data;
619 seq->private = inode->i_private; /* the dlm_ls */
620 return 0;
621 }
622
623 static int table_open2(struct inode *inode, struct file *file)
624 {
625 struct seq_file *seq;
626 int ret;
627
628 ret = seq_open(file, &format2_seq_ops);
629 if (ret)
630 return ret;
631
632 seq = file->private_data;
633 seq->private = inode->i_private; /* the dlm_ls */
634 return 0;
635 }
636
637 static int table_open3(struct inode *inode, struct file *file)
638 {
639 struct seq_file *seq;
640 int ret;
641
642 ret = seq_open(file, &format3_seq_ops);
643 if (ret)
644 return ret;
645
646 seq = file->private_data;
647 seq->private = inode->i_private; /* the dlm_ls */
648 return 0;
649 }
650
651 static int table_open4(struct inode *inode, struct file *file)
652 {
653 struct seq_file *seq;
654 int ret;
655
656 ret = seq_open(file, &format4_seq_ops);
657 if (ret)
658 return ret;
659
660 seq = file->private_data;
661 seq->private = inode->i_private; /* the dlm_ls */
662 return 0;
663 }
664
665 static const struct file_operations format1_fops = {
666 .owner = THIS_MODULE,
667 .open = table_open1,
668 .read = seq_read,
669 .llseek = seq_lseek,
670 .release = seq_release
671 };
672
673 static const struct file_operations format2_fops = {
674 .owner = THIS_MODULE,
675 .open = table_open2,
676 .read = seq_read,
677 .llseek = seq_lseek,
678 .release = seq_release
679 };
680
681 static const struct file_operations format3_fops = {
682 .owner = THIS_MODULE,
683 .open = table_open3,
684 .read = seq_read,
685 .llseek = seq_lseek,
686 .release = seq_release
687 };
688
689 static const struct file_operations format4_fops = {
690 .owner = THIS_MODULE,
691 .open = table_open4,
692 .read = seq_read,
693 .llseek = seq_lseek,
694 .release = seq_release
695 };
696
697 /*
698 * dump lkb's on the ls_waiters list
699 */
700 static ssize_t waiters_read(struct file *file, char __user *userbuf,
701 size_t count, loff_t *ppos)
702 {
703 struct dlm_ls *ls = file->private_data;
704 struct dlm_lkb *lkb;
705 size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv;
706
707 mutex_lock(&debug_buf_lock);
708 mutex_lock(&ls->ls_waiters_mutex);
709 memset(debug_buf, 0, sizeof(debug_buf));
710
711 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
712 ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n",
713 lkb->lkb_id, lkb->lkb_wait_type,
714 lkb->lkb_nodeid, lkb->lkb_resource->res_name);
715 if (ret >= len - pos)
716 break;
717 pos += ret;
718 }
719 mutex_unlock(&ls->ls_waiters_mutex);
720
721 rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos);
722 mutex_unlock(&debug_buf_lock);
723 return rv;
724 }
725
726 static const struct file_operations waiters_fops = {
727 .owner = THIS_MODULE,
728 .open = simple_open,
729 .read = waiters_read,
730 .llseek = default_llseek,
731 };
732
733 void dlm_delete_debug_file(struct dlm_ls *ls)
734 {
735 debugfs_remove(ls->ls_debug_rsb_dentry);
736 debugfs_remove(ls->ls_debug_waiters_dentry);
737 debugfs_remove(ls->ls_debug_locks_dentry);
738 debugfs_remove(ls->ls_debug_all_dentry);
739 debugfs_remove(ls->ls_debug_toss_dentry);
740 }
741
742 int dlm_create_debug_file(struct dlm_ls *ls)
743 {
744 char name[DLM_LOCKSPACE_LEN + 8];
745
746 /* format 1 */
747
748 ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
749 S_IFREG | S_IRUGO,
750 dlm_root,
751 ls,
752 &format1_fops);
753 if (!ls->ls_debug_rsb_dentry)
754 goto fail;
755
756 /* format 2 */
757
758 memset(name, 0, sizeof(name));
759 snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_locks", ls->ls_name);
760
761 ls->ls_debug_locks_dentry = debugfs_create_file(name,
762 S_IFREG | S_IRUGO,
763 dlm_root,
764 ls,
765 &format2_fops);
766 if (!ls->ls_debug_locks_dentry)
767 goto fail;
768
769 /* format 3 */
770
771 memset(name, 0, sizeof(name));
772 snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_all", ls->ls_name);
773
774 ls->ls_debug_all_dentry = debugfs_create_file(name,
775 S_IFREG | S_IRUGO,
776 dlm_root,
777 ls,
778 &format3_fops);
779 if (!ls->ls_debug_all_dentry)
780 goto fail;
781
782 /* format 4 */
783
784 memset(name, 0, sizeof(name));
785 snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_toss", ls->ls_name);
786
787 ls->ls_debug_toss_dentry = debugfs_create_file(name,
788 S_IFREG | S_IRUGO,
789 dlm_root,
790 ls,
791 &format4_fops);
792 if (!ls->ls_debug_toss_dentry)
793 goto fail;
794
795 memset(name, 0, sizeof(name));
796 snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_waiters", ls->ls_name);
797
798 ls->ls_debug_waiters_dentry = debugfs_create_file(name,
799 S_IFREG | S_IRUGO,
800 dlm_root,
801 ls,
802 &waiters_fops);
803 if (!ls->ls_debug_waiters_dentry)
804 goto fail;
805
806 return 0;
807
808 fail:
809 dlm_delete_debug_file(ls);
810 return -ENOMEM;
811 }
812
813 int __init dlm_register_debugfs(void)
814 {
815 mutex_init(&debug_buf_lock);
816 dlm_root = debugfs_create_dir("dlm", NULL);
817 return dlm_root ? 0 : -ENOMEM;
818 }
819
820 void dlm_unregister_debugfs(void)
821 {
822 debugfs_remove(dlm_root);
823 }
824
Linux with added FPC-III support