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(m: s, fmt: "%08x %s", lkb->lkb_id, print_lockmode(mode: lkb->lkb_grmode));
56
57 if (lkb->lkb_status == DLM_LKSTS_CONVERT ||
58 lkb->lkb_status == DLM_LKSTS_WAITING)
59 seq_printf(m: s, fmt: " (%s)", print_lockmode(mode: lkb->lkb_rqmode));
60
61 if (lkb->lkb_nodeid) {
62 if (lkb->lkb_nodeid != res->res_nodeid)
63 seq_printf(m: s, fmt: " Remote: %3d %08x", lkb->lkb_nodeid,
64 lkb->lkb_remid);
65 else
66 seq_printf(m: s, fmt: " Master: %08x", lkb->lkb_remid);
67 }
68
69 if (lkb->lkb_wait_type)
70 seq_printf(m: s, fmt: " wait_type: %d", lkb->lkb_wait_type);
71
72 seq_putc(m: s, c: '\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(r: res);
81
82 seq_printf(m: s, fmt: "\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(m: s, fmt: "%c", res->res_name[i]);
87 else
88 seq_printf(m: s, fmt: "%c", '.');
89 }
90
91 if (res->res_nodeid > 0)
92 seq_printf(m: s, fmt: "\"\nLocal Copy, Master is node %d\n",
93 res->res_nodeid);
94 else if (res->res_nodeid == 0)
95 seq_puts(m: s, s: "\"\nMaster Copy\n");
96 else if (res->res_nodeid == -1)
97 seq_printf(m: s, fmt: "\"\nLooking up master (lkid %x)\n",
98 res->res_first_lkid);
99 else
100 seq_printf(m: s, fmt: "\"\nInvalid master %d\n", res->res_nodeid);
101 if (seq_has_overflowed(m: s))
102 goto out;
103
104 /* Print the LVB: */
105 if (res->res_lvbptr) {
106 seq_puts(m: s, s: "LVB: ");
107 for (i = 0; i < lvblen; i++) {
108 if (i == lvblen / 2)
109 seq_puts(m: s, s: "\n ");
110 seq_printf(m: s, fmt: "%02x ",
111 (unsigned char) res->res_lvbptr[i]);
112 }
113 if (rsb_flag(r: res, flag: RSB_VALNOTVALID))
114 seq_puts(m: s, s: " (INVALID)");
115 seq_putc(m: s, c: '\n');
116 if (seq_has_overflowed(m: s))
117 goto out;
118 }
119
120 root_list = !list_empty(head: &res->res_root_list);
121 recover_list = !list_empty(head: &res->res_recover_list);
122
123 if (root_list || recover_list) {
124 seq_printf(m: s, fmt: "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(m: s, 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(m: s))
134 goto out;
135 }
136
137 seq_puts(m: s, 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(m: s))
141 goto out;
142 }
143
144 seq_puts(m: s, 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(m: s))
148 goto out;
149 }
150
151 if (list_empty(head: &res->res_lookup))
152 goto out;
153
154 seq_puts(m: s, s: "Lookup Queue\n");
155 list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) {
156 seq_printf(m: s, fmt: "%08x %s",
157 lkb->lkb_id, print_lockmode(mode: lkb->lkb_rqmode));
158 if (lkb->lkb_wait_type)
159 seq_printf(m: s, fmt: " wait_type: %d", lkb->lkb_wait_type);
160 seq_putc(m: s, c: '\n');
161 if (seq_has_overflowed(m: s))
162 goto out;
163 }
164 out:
165 unlock_rsb(r: 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(m: s, fmt: "%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(m: 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(m: 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(m: 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(m: s, fmt: "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(kt: lkb->lkb_timestamp),
255 (unsigned long long)ktime_to_ns(kt: 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(m: s, fmt: "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(head: &r->res_root_list),
272 !list_empty(head: &r->res_recover_list),
273 r->res_recover_locks_count,
274 r->res_length);
275 if (seq_has_overflowed(m: 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(m: s, s: print_name ? "str " : "hex");
284
285 for (i = 0; i < r->res_length; i++) {
286 if (print_name)
287 seq_printf(m: s, fmt: "%c", r->res_name[i]);
288 else
289 seq_printf(m: s, fmt: " %02x", (unsigned char)r->res_name[i]);
290 }
291 seq_putc(m: s, c: '\n');
292 if (seq_has_overflowed(m: s))
293 goto out;
294
295 if (!r->res_lvbptr)
296 goto do_locks;
297
298 seq_printf(m: s, fmt: "lvb %u %d", r->res_lvbseq, lvblen);
299
300 for (i = 0; i < lvblen; i++)
301 seq_printf(m: s, fmt: " %02x", (unsigned char)r->res_lvbptr[i]);
302 seq_putc(m: s, c: '\n');
303 if (seq_has_overflowed(m: 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, rsb_lookup: 0);
309 if (seq_has_overflowed(m: s))
310 goto out;
311 }
312
313 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
314 print_format3_lock(s, lkb, rsb_lookup: 0);
315 if (seq_has_overflowed(m: s))
316 goto out;
317 }
318
319 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
320 print_format3_lock(s, lkb, rsb_lookup: 0);
321 if (seq_has_overflowed(m: s))
322 goto out;
323 }
324
325 list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) {
326 print_format3_lock(s, lkb, rsb_lookup: 1);
327 if (seq_has_overflowed(m: 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(m: s, fmt: "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(m: s, s: print_name ? "str " : "hex");
358
359 for (i = 0; i < r->res_length; i++) {
360 if (print_name)
361 seq_printf(m: s, fmt: "%c", r->res_name[i]);
362 else
363 seq_printf(m: s, fmt: " %02x", (unsigned char)r->res_name[i]);
364 }
365 seq_putc(m: s, c: '\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(res: rsb, s: seq);
387 else if (seq->op == &format2_seq_ops)
388 print_format2(r: rsb, s: seq);
389 else if (seq->op == &format3_seq_ops)
390 print_format3(r: rsb, s: seq);
391 else if (seq->op == &format4_seq_ops)
392 print_format4(r: rsb, s: 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(m: seq, s: "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(m: seq, s: "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(m: seq, s: "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(head: list, pos: *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(v: iter_ptr, head: list, ppos: 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(to: buf, from: 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(p: name, DLM_RESNAME_MAXLEN);
522 error = dlm_debug_add_lkb(ls, lkb_id, name, len, lkb_nodeid: lkb_flags,
523 lkb_flags: 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(lock: &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(buf: debug_buf + pos, size: len - pos, fmt: "%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(lock: &ls->ls_waiters_lock);
620 dlm_unlock_recovery(ls);
621
622 rv = simple_read_from_buffer(to: userbuf, count, ppos, from: debug_buf, available: pos);
623out:
624 mutex_unlock(lock: &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(to: buf, from: 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(dentry: ls->ls_debug_rsb_dentry);
668 debugfs_remove(dentry: ls->ls_debug_waiters_dentry);
669 debugfs_remove(dentry: ls->ls_debug_locks_dentry);
670 debugfs_remove(dentry: ls->ls_debug_all_dentry);
671 debugfs_remove(dentry: ls->ls_debug_toss_dentry);
672 debugfs_remove(dentry: ls->ls_debug_queued_asts_dentry);
673}
674
675static int dlm_state_show(struct seq_file *file, void *offset)
676{
677 seq_printf(m: file, fmt: "%s\n", dlm_midcomms_state(node: 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(m: file, fmt: "%lu\n", dlm_midcomms_flags(node: 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(m: file, fmt: "%d\n", dlm_midcomms_send_queue_cnt(node: 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(m: file, fmt: "0x%08x\n", dlm_midcomms_version(node: 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(to: buf, from: user_buf, n: count)) {
717 ret = -EFAULT;
718 goto out;
719 }
720
721 ret = dlm_midcomms_rawmsg_send(node: fp->private_data, buf, buflen: count);
722 if (ret)
723 goto out;
724
725 kfree(objp: buf);
726 return count;
727
728out:
729 kfree(objp: 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(buf: name, size: 256, fmt: "%d", nodeid);
745
746 d_node = debugfs_create_dir(name, parent: 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(dentry: 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(buf: name, size: sizeof(name), fmt: "%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(buf: name, size: sizeof(name), fmt: "%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(buf: name, size: sizeof(name), fmt: "%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(buf: name, size: sizeof(name), fmt: "%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(name: "dlm", NULL);
818 dlm_comms = debugfs_create_dir(name: "comms", parent: dlm_root);
819}
820
821void dlm_unregister_debugfs(void)
822{
823 debugfs_remove(dentry: dlm_root);
824}
825
826

source code of linux/fs/dlm/debug_fs.c