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1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3*******************************************************************************
4**
5** Copyright (C) 2005-2009 Red Hat, Inc. All rights reserved.
6**
7**
8*******************************************************************************
9******************************************************************************/
10
11#include <linux/pagemap.h>
12#include <linux/seq_file.h>
13#include <linux/init.h>
14#include <linux/ctype.h>
15#include <linux/debugfs.h>
16#include <linux/slab.h>
17
18#include "dlm_internal.h"
19#include "midcomms.h"
20#include "lock.h"
21#include "ast.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;
28static struct dentry *dlm_comms;
29
30static char *print_lockmode(int mode)
31{
32 switch (mode) {
33 case DLM_LOCK_IV:
34 return "--";
35 case DLM_LOCK_NL:
36 return "NL";
37 case DLM_LOCK_CR:
38 return "CR";
39 case DLM_LOCK_CW:
40 return "CW";
41 case DLM_LOCK_PR:
42 return "PR";
43 case DLM_LOCK_PW:
44 return "PW";
45 case DLM_LOCK_EX:
46 return "EX";
47 default:
48 return "??";
49 }
50}
51
52static void print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
53 struct dlm_rsb *res)
54{
55 seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
56
57 if (lkb->lkb_status == DLM_LKSTS_CONVERT ||
58 lkb->lkb_status == DLM_LKSTS_WAITING)
59 seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode));
60
61 if (lkb->lkb_nodeid) {
62 if (lkb->lkb_nodeid != res->res_nodeid)
63 seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid,
64 lkb->lkb_remid);
65 else
66 seq_printf(s, " Master: %08x", lkb->lkb_remid);
67 }
68
69 if (lkb->lkb_wait_type)
70 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
71
72 seq_putc(s, '\n');
73}
74
75static void print_format1(struct dlm_rsb *res, struct seq_file *s)
76{
77 struct dlm_lkb *lkb;
78 int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
79
80 lock_rsb(res);
81
82 seq_printf(s, "\nResource %p Name (len=%d) \"", res, res->res_length);
83
84 for (i = 0; i < res->res_length; i++) {
85 if (isprint(res->res_name[i]))
86 seq_printf(s, "%c", res->res_name[i]);
87 else
88 seq_printf(s, "%c", '.');
89 }
90
91 if (res->res_nodeid > 0)
92 seq_printf(s, "\"\nLocal Copy, Master is node %d\n",
93 res->res_nodeid);
94 else if (res->res_nodeid == 0)
95 seq_puts(s, "\"\nMaster Copy\n");
96 else if (res->res_nodeid == -1)
97 seq_printf(s, "\"\nLooking up master (lkid %x)\n",
98 res->res_first_lkid);
99 else
100 seq_printf(s, "\"\nInvalid master %d\n", res->res_nodeid);
101 if (seq_has_overflowed(s))
102 goto out;
103
104 /* Print the LVB: */
105 if (res->res_lvbptr) {
106 seq_puts(s, "LVB: ");
107 for (i = 0; i < lvblen; i++) {
108 if (i == lvblen / 2)
109 seq_puts(s, "\n ");
110 seq_printf(s, "%02x ",
111 (unsigned char) res->res_lvbptr[i]);
112 }
113 if (rsb_flag(res, RSB_VALNOTVALID))
114 seq_puts(s, " (INVALID)");
115 seq_putc(s, '\n');
116 if (seq_has_overflowed(s))
117 goto out;
118 }
119
120 root_list = !list_empty(&res->res_root_list);
121 recover_list = !list_empty(&res->res_recover_list);
122
123 if (root_list || recover_list) {
124 seq_printf(s, "Recovery: root %d recover %d flags %lx count %d\n",
125 root_list, recover_list,
126 res->res_flags, res->res_recover_locks_count);
127 }
128
129 /* Print the locks attached to this resource */
130 seq_puts(s, "Granted Queue\n");
131 list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue) {
132 print_format1_lock(s, lkb, res);
133 if (seq_has_overflowed(s))
134 goto out;
135 }
136
137 seq_puts(s, "Conversion Queue\n");
138 list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue) {
139 print_format1_lock(s, lkb, res);
140 if (seq_has_overflowed(s))
141 goto out;
142 }
143
144 seq_puts(s, "Waiting Queue\n");
145 list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue) {
146 print_format1_lock(s, lkb, res);
147 if (seq_has_overflowed(s))
148 goto out;
149 }
150
151 if (list_empty(&res->res_lookup))
152 goto out;
153
154 seq_puts(s, "Lookup Queue\n");
155 list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) {
156 seq_printf(s, "%08x %s",
157 lkb->lkb_id, print_lockmode(lkb->lkb_rqmode));
158 if (lkb->lkb_wait_type)
159 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
160 seq_putc(s, '\n');
161 if (seq_has_overflowed(s))
162 goto out;
163 }
164 out:
165 unlock_rsb(res);
166}
167
168static void print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
169 struct dlm_rsb *r)
170{
171 u64 xid = 0;
172 u64 us;
173
174 if (test_bit(DLM_DFL_USER_BIT, &lkb->lkb_dflags)) {
175 if (lkb->lkb_ua)
176 xid = lkb->lkb_ua->xid;
177 }
178
179 /* microseconds since lkb was added to current queue */
180 us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp));
181
182 /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us
183 r_nodeid r_len r_name */
184
185 seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
186 lkb->lkb_id,
187 lkb->lkb_nodeid,
188 lkb->lkb_remid,
189 lkb->lkb_ownpid,
190 (unsigned long long)xid,
191 lkb->lkb_exflags,
192 dlm_iflags_val(lkb),
193 lkb->lkb_status,
194 lkb->lkb_grmode,
195 lkb->lkb_rqmode,
196 (unsigned long long)us,
197 r->res_nodeid,
198 r->res_length,
199 r->res_name);
200}
201
202static void print_format2(struct dlm_rsb *r, struct seq_file *s)
203{
204 struct dlm_lkb *lkb;
205
206 lock_rsb(r);
207
208 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
209 print_format2_lock(s, lkb, r);
210 if (seq_has_overflowed(s))
211 goto out;
212 }
213
214 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
215 print_format2_lock(s, lkb, r);
216 if (seq_has_overflowed(s))
217 goto out;
218 }
219
220 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
221 print_format2_lock(s, lkb, r);
222 if (seq_has_overflowed(s))
223 goto out;
224 }
225 out:
226 unlock_rsb(r);
227}
228
229static void print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
230 int rsb_lookup)
231{
232 u64 xid = 0;
233
234 if (test_bit(DLM_DFL_USER_BIT, &lkb->lkb_dflags)) {
235 if (lkb->lkb_ua)
236 xid = lkb->lkb_ua->xid;
237 }
238
239 seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
240 lkb->lkb_id,
241 lkb->lkb_nodeid,
242 lkb->lkb_remid,
243 lkb->lkb_ownpid,
244 (unsigned long long)xid,
245 lkb->lkb_exflags,
246 dlm_iflags_val(lkb),
247 lkb->lkb_status,
248 lkb->lkb_grmode,
249 lkb->lkb_rqmode,
250 lkb->lkb_last_bast_cb_mode,
251 rsb_lookup,
252 lkb->lkb_wait_type,
253 lkb->lkb_lvbseq,
254 (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
255 (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time));
256}
257
258static void print_format3(struct dlm_rsb *r, struct seq_file *s)
259{
260 struct dlm_lkb *lkb;
261 int i, lvblen = r->res_ls->ls_lvblen;
262 int print_name = 1;
263
264 lock_rsb(r);
265
266 seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
267 r,
268 r->res_nodeid,
269 r->res_first_lkid,
270 r->res_flags,
271 !list_empty(&r->res_root_list),
272 !list_empty(&r->res_recover_list),
273 r->res_recover_locks_count,
274 r->res_length);
275 if (seq_has_overflowed(s))
276 goto out;
277
278 for (i = 0; i < r->res_length; i++) {
279 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
280 print_name = 0;
281 }
282
283 seq_puts(s, print_name ? "str " : "hex");
284
285 for (i = 0; i < r->res_length; i++) {
286 if (print_name)
287 seq_printf(s, "%c", r->res_name[i]);
288 else
289 seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
290 }
291 seq_putc(s, '\n');
292 if (seq_has_overflowed(s))
293 goto out;
294
295 if (!r->res_lvbptr)
296 goto do_locks;
297
298 seq_printf(s, "lvb %u %d", r->res_lvbseq, lvblen);
299
300 for (i = 0; i < lvblen; i++)
301 seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]);
302 seq_putc(s, '\n');
303 if (seq_has_overflowed(s))
304 goto out;
305
306 do_locks:
307 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
308 print_format3_lock(s, lkb, 0);
309 if (seq_has_overflowed(s))
310 goto out;
311 }
312
313 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
314 print_format3_lock(s, lkb, 0);
315 if (seq_has_overflowed(s))
316 goto out;
317 }
318
319 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
320 print_format3_lock(s, lkb, 0);
321 if (seq_has_overflowed(s))
322 goto out;
323 }
324
325 list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) {
326 print_format3_lock(s, lkb, 1);
327 if (seq_has_overflowed(s))
328 goto out;
329 }
330 out:
331 unlock_rsb(r);
332}
333
334static void print_format4(struct dlm_rsb *r, struct seq_file *s)
335{
336 int our_nodeid = dlm_our_nodeid();
337 int print_name = 1;
338 int i;
339
340 lock_rsb(r);
341
342 seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ",
343 r,
344 r->res_nodeid,
345 r->res_master_nodeid,
346 r->res_dir_nodeid,
347 our_nodeid,
348 r->res_toss_time,
349 r->res_flags,
350 r->res_length);
351
352 for (i = 0; i < r->res_length; i++) {
353 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
354 print_name = 0;
355 }
356
357 seq_puts(s, print_name ? "str " : "hex");
358
359 for (i = 0; i < r->res_length; i++) {
360 if (print_name)
361 seq_printf(s, "%c", r->res_name[i]);
362 else
363 seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
364 }
365 seq_putc(s, '\n');
366 unlock_rsb(r);
367}
368
369static const struct seq_operations format1_seq_ops;
370static const struct seq_operations format2_seq_ops;
371static const struct seq_operations format3_seq_ops;
372static const struct seq_operations format4_seq_ops;
373
374/*
375 * If the buffer is full, seq_printf can be called again, but it
376 * does nothing. So, the these printing routines periodically check
377 * seq_has_overflowed to avoid wasting too much time trying to print to
378 * a full buffer.
379 */
380
381static int table_seq_show(struct seq_file *seq, void *iter_ptr)
382{
383 struct dlm_rsb *rsb = list_entry(iter_ptr, struct dlm_rsb, res_slow_list);
384
385 if (seq->op == &format1_seq_ops)
386 print_format1(rsb, seq);
387 else if (seq->op == &format2_seq_ops)
388 print_format2(rsb, seq);
389 else if (seq->op == &format3_seq_ops)
390 print_format3(rsb, seq);
391 else if (seq->op == &format4_seq_ops)
392 print_format4(rsb, seq);
393
394 return 0;
395}
396
397static void *table_seq_start(struct seq_file *seq, loff_t *pos)
398{
399 struct dlm_ls *ls = seq->private;
400 struct list_head *list;
401
402 if (!*pos) {
403 if (seq->op == &format2_seq_ops)
404 seq_puts(seq, "id nodeid remid pid xid exflags flags sts grmode rqmode time_ms r_nodeid r_len r_name\n");
405 else if (seq->op == &format3_seq_ops)
406 seq_puts(seq, "rsb ptr nodeid first_lkid flags !root_list_empty !recover_list_empty recover_locks_count len\n");
407 else if (seq->op == &format4_seq_ops)
408 seq_puts(seq, "rsb ptr nodeid master_nodeid dir_nodeid our_nodeid toss_time flags len str|hex name\n");
409 }
410
411 if (seq->op == &format4_seq_ops)
412 list = &ls->ls_slow_inactive;
413 else
414 list = &ls->ls_slow_active;
415
416 read_lock_bh(&ls->ls_rsbtbl_lock);
417 return seq_list_start(list, *pos);
418}
419
420static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
421{
422 struct dlm_ls *ls = seq->private;
423 struct list_head *list;
424
425 if (seq->op == &format4_seq_ops)
426 list = &ls->ls_slow_inactive;
427 else
428 list = &ls->ls_slow_active;
429
430 return seq_list_next(iter_ptr, list, pos);
431}
432
433static void table_seq_stop(struct seq_file *seq, void *iter_ptr)
434{
435 struct dlm_ls *ls = seq->private;
436
437 read_unlock_bh(&ls->ls_rsbtbl_lock);
438}
439
440static const struct seq_operations format1_seq_ops = {
441 .start = table_seq_start,
442 .next = table_seq_next,
443 .stop = table_seq_stop,
444 .show = table_seq_show,
445};
446
447static const struct seq_operations format2_seq_ops = {
448 .start = table_seq_start,
449 .next = table_seq_next,
450 .stop = table_seq_stop,
451 .show = table_seq_show,
452};
453
454static const struct seq_operations format3_seq_ops = {
455 .start = table_seq_start,
456 .next = table_seq_next,
457 .stop = table_seq_stop,
458 .show = table_seq_show,
459};
460
461static const struct seq_operations format4_seq_ops = {
462 .start = table_seq_start,
463 .next = table_seq_next,
464 .stop = table_seq_stop,
465 .show = table_seq_show,
466};
467
468static const struct file_operations format1_fops;
469static const struct file_operations format2_fops;
470static const struct file_operations format3_fops;
471static const struct file_operations format4_fops;
472
473static int table_open1(struct inode *inode, struct file *file)
474{
475 struct seq_file *seq;
476 int ret;
477
478 ret = seq_open(file, &format1_seq_ops);
479 if (ret)
480 return ret;
481
482 seq = file->private_data;
483 seq->private = inode->i_private; /* the dlm_ls */
484 return 0;
485}
486
487static int table_open2(struct inode *inode, struct file *file)
488{
489 struct seq_file *seq;
490 int ret;
491
492 ret = seq_open(file, &format2_seq_ops);
493 if (ret)
494 return ret;
495
496 seq = file->private_data;
497 seq->private = inode->i_private; /* the dlm_ls */
498 return 0;
499}
500
501static ssize_t table_write2(struct file *file, const char __user *user_buf,
502 size_t count, loff_t *ppos)
503{
504 struct seq_file *seq = file->private_data;
505 int n, len, lkb_nodeid, lkb_status, error;
506 char name[DLM_RESNAME_MAXLEN + 1] = {};
507 struct dlm_ls *ls = seq->private;
508 unsigned int lkb_flags;
509 char buf[256] = {};
510 uint32_t lkb_id;
511
512 if (copy_from_user(buf, user_buf,
513 min_t(size_t, sizeof(buf) - 1, count)))
514 return -EFAULT;
515
516 n = sscanf(buf, "%x %" __stringify(DLM_RESNAME_MAXLEN) "s %x %d %d",
517 &lkb_id, name, &lkb_flags, &lkb_nodeid, &lkb_status);
518 if (n != 5)
519 return -EINVAL;
520
521 len = strnlen(name, DLM_RESNAME_MAXLEN);
522 error = dlm_debug_add_lkb(ls, lkb_id, name, len, lkb_flags,
523 lkb_nodeid, lkb_status);
524 if (error)
525 return error;
526
527 return count;
528}
529
530static int table_open3(struct inode *inode, struct file *file)
531{
532 struct seq_file *seq;
533 int ret;
534
535 ret = seq_open(file, &format3_seq_ops);
536 if (ret)
537 return ret;
538
539 seq = file->private_data;
540 seq->private = inode->i_private; /* the dlm_ls */
541 return 0;
542}
543
544static int table_open4(struct inode *inode, struct file *file)
545{
546 struct seq_file *seq;
547 int ret;
548
549 ret = seq_open(file, &format4_seq_ops);
550 if (ret)
551 return ret;
552
553 seq = file->private_data;
554 seq->private = inode->i_private; /* the dlm_ls */
555 return 0;
556}
557
558static const struct file_operations format1_fops = {
559 .owner = THIS_MODULE,
560 .open = table_open1,
561 .read = seq_read,
562 .llseek = seq_lseek,
563 .release = seq_release
564};
565
566static const struct file_operations format2_fops = {
567 .owner = THIS_MODULE,
568 .open = table_open2,
569 .read = seq_read,
570 .write = table_write2,
571 .llseek = seq_lseek,
572 .release = seq_release
573};
574
575static const struct file_operations format3_fops = {
576 .owner = THIS_MODULE,
577 .open = table_open3,
578 .read = seq_read,
579 .llseek = seq_lseek,
580 .release = seq_release
581};
582
583static const struct file_operations format4_fops = {
584 .owner = THIS_MODULE,
585 .open = table_open4,
586 .read = seq_read,
587 .llseek = seq_lseek,
588 .release = seq_release
589};
590
591/*
592 * dump lkb's on the ls_waiters list
593 */
594static ssize_t waiters_read(struct file *file, char __user *userbuf,
595 size_t count, loff_t *ppos)
596{
597 struct dlm_ls *ls = file->private_data;
598 struct dlm_lkb *lkb;
599 size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv;
600
601 mutex_lock(&debug_buf_lock);
602 ret = dlm_lock_recovery_try(ls);
603 if (!ret) {
604 rv = -EAGAIN;
605 goto out;
606 }
607
608 spin_lock_bh(&ls->ls_waiters_lock);
609 memset(debug_buf, 0, sizeof(debug_buf));
610
611 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
612 ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n",
613 lkb->lkb_id, lkb->lkb_wait_type,
614 lkb->lkb_nodeid, lkb->lkb_resource->res_name);
615 if (ret >= len - pos)
616 break;
617 pos += ret;
618 }
619 spin_unlock_bh(&ls->ls_waiters_lock);
620 dlm_unlock_recovery(ls);
621
622 rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos);
623out:
624 mutex_unlock(&debug_buf_lock);
625 return rv;
626}
627
628static ssize_t waiters_write(struct file *file, const char __user *user_buf,
629 size_t count, loff_t *ppos)
630{
631 struct dlm_ls *ls = file->private_data;
632 int mstype, to_nodeid;
633 char buf[128] = {};
634 uint32_t lkb_id;
635 int n, error;
636
637 if (copy_from_user(buf, user_buf,
638 min_t(size_t, sizeof(buf) - 1, count)))
639 return -EFAULT;
640
641 n = sscanf(buf, "%x %d %d", &lkb_id, &mstype, &to_nodeid);
642 if (n != 3)
643 return -EINVAL;
644
645 error = dlm_lock_recovery_try(ls);
646 if (!error)
647 return -EAGAIN;
648
649 error = dlm_debug_add_lkb_to_waiters(ls, lkb_id, mstype, to_nodeid);
650 dlm_unlock_recovery(ls);
651 if (error)
652 return error;
653
654 return count;
655}
656
657static const struct file_operations waiters_fops = {
658 .owner = THIS_MODULE,
659 .open = simple_open,
660 .read = waiters_read,
661 .write = waiters_write,
662 .llseek = default_llseek,
663};
664
665void dlm_delete_debug_file(struct dlm_ls *ls)
666{
667 debugfs_remove(ls->ls_debug_rsb_dentry);
668 debugfs_remove(ls->ls_debug_waiters_dentry);
669 debugfs_remove(ls->ls_debug_locks_dentry);
670 debugfs_remove(ls->ls_debug_all_dentry);
671 debugfs_remove(ls->ls_debug_toss_dentry);
672 debugfs_remove(ls->ls_debug_queued_asts_dentry);
673}
674
675static int dlm_state_show(struct seq_file *file, void *offset)
676{
677 seq_printf(file, "%s\n", dlm_midcomms_state(file->private));
678 return 0;
679}
680DEFINE_SHOW_ATTRIBUTE(dlm_state);
681
682static int dlm_flags_show(struct seq_file *file, void *offset)
683{
684 seq_printf(file, "%lu\n", dlm_midcomms_flags(file->private));
685 return 0;
686}
687DEFINE_SHOW_ATTRIBUTE(dlm_flags);
688
689static int dlm_send_queue_cnt_show(struct seq_file *file, void *offset)
690{
691 seq_printf(file, "%d\n", dlm_midcomms_send_queue_cnt(file->private));
692 return 0;
693}
694DEFINE_SHOW_ATTRIBUTE(dlm_send_queue_cnt);
695
696static int dlm_version_show(struct seq_file *file, void *offset)
697{
698 seq_printf(file, "0x%08x\n", dlm_midcomms_version(file->private));
699 return 0;
700}
701DEFINE_SHOW_ATTRIBUTE(dlm_version);
702
703static ssize_t dlm_rawmsg_write(struct file *fp, const char __user *user_buf,
704 size_t count, loff_t *ppos)
705{
706 void *buf;
707 int ret;
708
709 if (count > PAGE_SIZE || count < sizeof(struct dlm_header))
710 return -EINVAL;
711
712 buf = kmalloc(PAGE_SIZE, GFP_NOFS);
713 if (!buf)
714 return -ENOMEM;
715
716 if (copy_from_user(buf, user_buf, count)) {
717 ret = -EFAULT;
718 goto out;
719 }
720
721 ret = dlm_midcomms_rawmsg_send(fp->private_data, buf, count);
722 if (ret)
723 goto out;
724
725 kfree(buf);
726 return count;
727
728out:
729 kfree(buf);
730 return ret;
731}
732
733static const struct file_operations dlm_rawmsg_fops = {
734 .open = simple_open,
735 .write = dlm_rawmsg_write,
736};
737
738void *dlm_create_debug_comms_file(int nodeid, void *data)
739{
740 struct dentry *d_node;
741 char name[256];
742
743 memset(name, 0, sizeof(name));
744 snprintf(name, 256, "%d", nodeid);
745
746 d_node = debugfs_create_dir(name, dlm_comms);
747 debugfs_create_file("state", 0444, d_node, data, &dlm_state_fops);
748 debugfs_create_file("flags", 0444, d_node, data, &dlm_flags_fops);
749 debugfs_create_file("send_queue_count", 0444, d_node, data,
750 &dlm_send_queue_cnt_fops);
751 debugfs_create_file("version", 0444, d_node, data, &dlm_version_fops);
752 debugfs_create_file("rawmsg", 0200, d_node, data, &dlm_rawmsg_fops);
753
754 return d_node;
755}
756
757void dlm_delete_debug_comms_file(void *ctx)
758{
759 debugfs_remove(ctx);
760}
761
762void dlm_create_debug_file(struct dlm_ls *ls)
763{
764 /* Reserve enough space for the longest file name */
765 char name[DLM_LOCKSPACE_LEN + sizeof("_queued_asts")];
766
767 /* format 1 */
768
769 ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
770 S_IFREG | S_IRUGO,
771 dlm_root,
772 ls,
773 &format1_fops);
774
775 /* format 2 */
776
777 snprintf(name, sizeof(name), "%s_locks", ls->ls_name);
778
779 ls->ls_debug_locks_dentry = debugfs_create_file(name,
780 0644,
781 dlm_root,
782 ls,
783 &format2_fops);
784
785 /* format 3 */
786
787 snprintf(name, sizeof(name), "%s_all", ls->ls_name);
788
789 ls->ls_debug_all_dentry = debugfs_create_file(name,
790 S_IFREG | S_IRUGO,
791 dlm_root,
792 ls,
793 &format3_fops);
794
795 /* format 4 */
796
797 snprintf(name, sizeof(name), "%s_toss", ls->ls_name);
798
799 ls->ls_debug_toss_dentry = debugfs_create_file(name,
800 S_IFREG | S_IRUGO,
801 dlm_root,
802 ls,
803 &format4_fops);
804
805 snprintf(name, sizeof(name), "%s_waiters", ls->ls_name);
806
807 ls->ls_debug_waiters_dentry = debugfs_create_file(name,
808 0644,
809 dlm_root,
810 ls,
811 &waiters_fops);
812}
813
814void __init dlm_register_debugfs(void)
815{
816 mutex_init(&debug_buf_lock);
817 dlm_root = debugfs_create_dir("dlm", NULL);
818 dlm_comms = debugfs_create_dir("comms", dlm_root);
819}
820
821void dlm_unregister_debugfs(void)
822{
823 debugfs_remove(dlm_root);
824}
825
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/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 /* Print the LVB: */
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 /* Print the locks attached to this resource */
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 /* microseconds since lkb was added to current queue */
186 us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp));
187
188 /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us
189 r_nodeid r_len r_name */
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/* seq_printf returns -1 if the buffer is full, and 0 otherwise.
394 If the buffer is full, seq_printf can be called again, but it
395 does nothing and just returns -1. So, the these printing routines
396 periodically check the return value to avoid wasting too much time
397 trying to print to a full buffer. */
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 * move to the first rsb in the next non-empty bucket
491 */
492
493 /* zero the entry */
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 * move to the next rsb in the same bucket
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 * move to the first rsb in the next non-empty bucket
556 */
557
558 /* zero the entry */
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; /* the dlm_ls */
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 * dump lkb's on the ls_waiters list
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 /* format 1 */
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 /* format 2 */
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 /* format 3 */
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 /* format 4 */
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