1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * dlmdebug.c
4 *
5 * debug functionality for the dlm
6 *
7 * Copyright (C) 2004, 2008 Oracle. All rights reserved.
8 */
9
10 #include <linux/types.h>
11 #include <linux/slab.h>
12 #include <linux/highmem.h>
13 #include <linux/sysctl.h>
14 #include <linux/spinlock.h>
15 #include <linux/debugfs.h>
16 #include <linux/export.h>
17 #include <linux/string_choices.h>
18
19 #include "../cluster/heartbeat.h"
20 #include "../cluster/nodemanager.h"
21 #include "../cluster/tcp.h"
22
23 #include "dlmapi.h"
24 #include "dlmcommon.h"
25 #include "dlmdomain.h"
26 #include "dlmdebug.h"
27
28 #define MLOG_MASK_PREFIX ML_DLM
29 #include "../cluster/masklog.h"
30
31 static int stringify_lockname(const char *lockname, int locklen, char *buf,
32 int len);
33
dlm_print_one_lock_resource(struct dlm_lock_resource * res)34 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
35 {
36 spin_lock(&res->spinlock);
37 __dlm_print_one_lock_resource(res);
38 spin_unlock(&res->spinlock);
39 }
40
dlm_print_lockres_refmap(struct dlm_lock_resource * res)41 static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
42 {
43 int bit;
44 assert_spin_locked(&res->spinlock);
45
46 printk(" refmap nodes: [ ");
47 bit = 0;
48 while (1) {
49 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
50 if (bit >= O2NM_MAX_NODES)
51 break;
52 printk("%u ", bit);
53 bit++;
54 }
55 printk("], inflight=%u\n", res->inflight_locks);
56 }
57
__dlm_print_lock(struct dlm_lock * lock)58 static void __dlm_print_lock(struct dlm_lock *lock)
59 {
60 spin_lock(&lock->spinlock);
61
62 printk(" type=%d, conv=%d, node=%u, cookie=%u:%llu, "
63 "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), "
64 "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n",
65 lock->ml.type, lock->ml.convert_type, lock->ml.node,
66 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
67 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
68 kref_read(&lock->lock_refs),
69 (list_empty(&lock->ast_list) ? 'y' : 'n'),
70 (lock->ast_pending ? 'y' : 'n'),
71 (list_empty(&lock->bast_list) ? 'y' : 'n'),
72 (lock->bast_pending ? 'y' : 'n'),
73 (lock->convert_pending ? 'y' : 'n'),
74 (lock->lock_pending ? 'y' : 'n'),
75 (lock->cancel_pending ? 'y' : 'n'),
76 (lock->unlock_pending ? 'y' : 'n'));
77
78 spin_unlock(&lock->spinlock);
79 }
80
__dlm_print_one_lock_resource(struct dlm_lock_resource * res)81 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
82 {
83 struct dlm_lock *lock;
84 char buf[DLM_LOCKID_NAME_MAX];
85
86 assert_spin_locked(&res->spinlock);
87
88 stringify_lockname(res->lockname.name, res->lockname.len,
89 buf, sizeof(buf));
90 printk("lockres: %s, owner=%u, state=%u\n",
91 buf, res->owner, res->state);
92 printk(" last used: %lu, refcnt: %u, on purge list: %s\n",
93 res->last_used, kref_read(&res->refs),
94 str_no_yes(list_empty(&res->purge)));
95 printk(" on dirty list: %s, on reco list: %s, "
96 "migrating pending: %s\n",
97 str_no_yes(list_empty(&res->dirty)),
98 str_no_yes(list_empty(&res->recovering)),
99 str_yes_no(res->migration_pending));
100 printk(" inflight locks: %d, asts reserved: %d\n",
101 res->inflight_locks, atomic_read(&res->asts_reserved));
102 dlm_print_lockres_refmap(res);
103 printk(" granted queue:\n");
104 list_for_each_entry(lock, &res->granted, list) {
105 __dlm_print_lock(lock);
106 }
107 printk(" converting queue:\n");
108 list_for_each_entry(lock, &res->converting, list) {
109 __dlm_print_lock(lock);
110 }
111 printk(" blocked queue:\n");
112 list_for_each_entry(lock, &res->blocked, list) {
113 __dlm_print_lock(lock);
114 }
115 }
116
dlm_print_one_lock(struct dlm_lock * lockid)117 void dlm_print_one_lock(struct dlm_lock *lockid)
118 {
119 dlm_print_one_lock_resource(lockid->lockres);
120 }
121 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
122
123 static const char *dlm_errnames[] = {
124 [DLM_NORMAL] = "DLM_NORMAL",
125 [DLM_GRANTED] = "DLM_GRANTED",
126 [DLM_DENIED] = "DLM_DENIED",
127 [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS",
128 [DLM_WORKING] = "DLM_WORKING",
129 [DLM_BLOCKED] = "DLM_BLOCKED",
130 [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN",
131 [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD",
132 [DLM_SYSERR] = "DLM_SYSERR",
133 [DLM_NOSUPPORT] = "DLM_NOSUPPORT",
134 [DLM_CANCELGRANT] = "DLM_CANCELGRANT",
135 [DLM_IVLOCKID] = "DLM_IVLOCKID",
136 [DLM_SYNC] = "DLM_SYNC",
137 [DLM_BADTYPE] = "DLM_BADTYPE",
138 [DLM_BADRESOURCE] = "DLM_BADRESOURCE",
139 [DLM_MAXHANDLES] = "DLM_MAXHANDLES",
140 [DLM_NOCLINFO] = "DLM_NOCLINFO",
141 [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR",
142 [DLM_NOPURGED] = "DLM_NOPURGED",
143 [DLM_BADARGS] = "DLM_BADARGS",
144 [DLM_VOID] = "DLM_VOID",
145 [DLM_NOTQUEUED] = "DLM_NOTQUEUED",
146 [DLM_IVBUFLEN] = "DLM_IVBUFLEN",
147 [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT",
148 [DLM_BADPARAM] = "DLM_BADPARAM",
149 [DLM_VALNOTVALID] = "DLM_VALNOTVALID",
150 [DLM_REJECTED] = "DLM_REJECTED",
151 [DLM_ABORT] = "DLM_ABORT",
152 [DLM_CANCEL] = "DLM_CANCEL",
153 [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE",
154 [DLM_DEADLOCK] = "DLM_DEADLOCK",
155 [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS",
156 [DLM_FORWARD] = "DLM_FORWARD",
157 [DLM_TIMEOUT] = "DLM_TIMEOUT",
158 [DLM_IVGROUPID] = "DLM_IVGROUPID",
159 [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT",
160 [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH",
161 [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION",
162 [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ",
163 [DLM_RECOVERING] = "DLM_RECOVERING",
164 [DLM_MIGRATING] = "DLM_MIGRATING",
165 [DLM_MAXSTATS] = "DLM_MAXSTATS",
166 };
167
dlm_errname(enum dlm_status err)168 const char *dlm_errname(enum dlm_status err)
169 {
170 if (err >= DLM_MAXSTATS || err < 0)
171 return dlm_errnames[DLM_MAXSTATS];
172 return dlm_errnames[err];
173 }
174 EXPORT_SYMBOL_GPL(dlm_errname);
175
176 /* NOTE: This function converts a lockname into a string. It uses knowledge
177 * of the format of the lockname that should be outside the purview of the dlm.
178 * We are adding only to make dlm debugging slightly easier.
179 *
180 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
181 */
stringify_lockname(const char * lockname,int locklen,char * buf,int len)182 static int stringify_lockname(const char *lockname, int locklen, char *buf,
183 int len)
184 {
185 int out = 0;
186 __be64 inode_blkno_be;
187
188 #define OCFS2_DENTRY_LOCK_INO_START 18
189 if (*lockname == 'N') {
190 memcpy((__be64 *)&inode_blkno_be,
191 (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
192 sizeof(__be64));
193 out += scnprintf(buf + out, len - out, "%.*s%08x",
194 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
195 (unsigned int)be64_to_cpu(inode_blkno_be));
196 } else
197 out += scnprintf(buf + out, len - out, "%.*s",
198 locklen, lockname);
199 return out;
200 }
201
stringify_nodemap(unsigned long * nodemap,int maxnodes,char * buf,int len)202 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
203 char *buf, int len)
204 {
205 int out = 0;
206 int i = -1;
207
208 while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
209 out += scnprintf(buf + out, len - out, "%d ", i);
210
211 return out;
212 }
213
dump_mle(struct dlm_master_list_entry * mle,char * buf,int len)214 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
215 {
216 int out = 0;
217 char *mle_type;
218
219 if (mle->type == DLM_MLE_BLOCK)
220 mle_type = "BLK";
221 else if (mle->type == DLM_MLE_MASTER)
222 mle_type = "MAS";
223 else
224 mle_type = "MIG";
225
226 out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
227 out += scnprintf(buf + out, len - out,
228 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
229 mle_type, mle->master, mle->new_master,
230 !list_empty(&mle->hb_events),
231 !!mle->inuse,
232 kref_read(&mle->mle_refs));
233
234 out += scnprintf(buf + out, len - out, "Maybe=");
235 out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
236 buf + out, len - out);
237 out += scnprintf(buf + out, len - out, "\n");
238
239 out += scnprintf(buf + out, len - out, "Vote=");
240 out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
241 buf + out, len - out);
242 out += scnprintf(buf + out, len - out, "\n");
243
244 out += scnprintf(buf + out, len - out, "Response=");
245 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
246 buf + out, len - out);
247 out += scnprintf(buf + out, len - out, "\n");
248
249 out += scnprintf(buf + out, len - out, "Node=");
250 out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
251 buf + out, len - out);
252 out += scnprintf(buf + out, len - out, "\n");
253
254 out += scnprintf(buf + out, len - out, "\n");
255
256 return out;
257 }
258
dlm_print_one_mle(struct dlm_master_list_entry * mle)259 void dlm_print_one_mle(struct dlm_master_list_entry *mle)
260 {
261 char *buf;
262
263 buf = kzalloc(PAGE_SIZE, GFP_ATOMIC);
264 if (buf) {
265 dump_mle(mle, buf, PAGE_SIZE - 1);
266 kfree(buf);
267 }
268 }
269
270 #ifdef CONFIG_DEBUG_FS
271
272 static struct dentry *dlm_debugfs_root;
273
274 #define DLM_DEBUGFS_DIR "o2dlm"
275 #define DLM_DEBUGFS_DLM_STATE "dlm_state"
276 #define DLM_DEBUGFS_LOCKING_STATE "locking_state"
277 #define DLM_DEBUGFS_MLE_STATE "mle_state"
278 #define DLM_DEBUGFS_PURGE_LIST "purge_list"
279
280 /* begin - utils funcs */
debug_release(struct inode * inode,struct file * file)281 static int debug_release(struct inode *inode, struct file *file)
282 {
283 kfree(file->private_data);
284 return 0;
285 }
286
debug_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)287 static ssize_t debug_read(struct file *file, char __user *buf,
288 size_t nbytes, loff_t *ppos)
289 {
290 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
291 i_size_read(file->f_mapping->host));
292 }
293 /* end - util funcs */
294
295 /* begin - purge list funcs */
debug_purgelist_print(struct dlm_ctxt * dlm,char * buf,int len)296 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
297 {
298 struct dlm_lock_resource *res;
299 int out = 0;
300 unsigned long total = 0;
301
302 out += scnprintf(buf + out, len - out,
303 "Dumping Purgelist for Domain: %s\n", dlm->name);
304
305 spin_lock(&dlm->spinlock);
306 list_for_each_entry(res, &dlm->purge_list, purge) {
307 ++total;
308 if (len - out < 100)
309 continue;
310 spin_lock(&res->spinlock);
311 out += stringify_lockname(res->lockname.name,
312 res->lockname.len,
313 buf + out, len - out);
314 out += scnprintf(buf + out, len - out, "\t%ld\n",
315 (jiffies - res->last_used)/HZ);
316 spin_unlock(&res->spinlock);
317 }
318 spin_unlock(&dlm->spinlock);
319
320 out += scnprintf(buf + out, len - out, "Total on list: %lu\n", total);
321
322 return out;
323 }
324
debug_purgelist_open(struct inode * inode,struct file * file)325 static int debug_purgelist_open(struct inode *inode, struct file *file)
326 {
327 struct dlm_ctxt *dlm = inode->i_private;
328 char *buf = NULL;
329
330 buf = kzalloc(PAGE_SIZE, GFP_NOFS);
331 if (!buf)
332 return -ENOMEM;
333
334 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
335
336 file->private_data = buf;
337
338 return 0;
339 }
340
341 static const struct file_operations debug_purgelist_fops = {
342 .open = debug_purgelist_open,
343 .release = debug_release,
344 .read = debug_read,
345 .llseek = generic_file_llseek,
346 };
347 /* end - purge list funcs */
348
349 /* begin - debug mle funcs */
debug_mle_print(struct dlm_ctxt * dlm,char * buf,int len)350 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
351 {
352 struct dlm_master_list_entry *mle;
353 struct hlist_head *bucket;
354 int i, out = 0;
355 unsigned long total = 0, longest = 0, bucket_count = 0;
356
357 out += scnprintf(buf + out, len - out,
358 "Dumping MLEs for Domain: %s\n", dlm->name);
359
360 spin_lock(&dlm->master_lock);
361 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
362 bucket = dlm_master_hash(dlm, i);
363 hlist_for_each_entry(mle, bucket, master_hash_node) {
364 ++total;
365 ++bucket_count;
366 if (len - out < 200)
367 continue;
368 out += dump_mle(mle, buf + out, len - out);
369 }
370 longest = max(longest, bucket_count);
371 bucket_count = 0;
372 }
373 spin_unlock(&dlm->master_lock);
374
375 out += scnprintf(buf + out, len - out,
376 "Total: %lu, Longest: %lu\n", total, longest);
377 return out;
378 }
379
debug_mle_open(struct inode * inode,struct file * file)380 static int debug_mle_open(struct inode *inode, struct file *file)
381 {
382 struct dlm_ctxt *dlm = inode->i_private;
383 char *buf = NULL;
384
385 buf = kzalloc(PAGE_SIZE, GFP_NOFS);
386 if (!buf)
387 return -ENOMEM;
388
389 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
390
391 file->private_data = buf;
392
393 return 0;
394 }
395
396 static const struct file_operations debug_mle_fops = {
397 .open = debug_mle_open,
398 .release = debug_release,
399 .read = debug_read,
400 .llseek = generic_file_llseek,
401 };
402
403 /* end - debug mle funcs */
404
405 /* begin - debug lockres funcs */
dump_lock(struct dlm_lock * lock,int list_type,char * buf,int len)406 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
407 {
408 int out;
409
410 #define DEBUG_LOCK_VERSION 1
411 spin_lock(&lock->spinlock);
412 out = scnprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
413 "%d,%d,%d,%d\n",
414 DEBUG_LOCK_VERSION,
415 list_type, lock->ml.type, lock->ml.convert_type,
416 lock->ml.node,
417 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
418 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
419 !list_empty(&lock->ast_list),
420 !list_empty(&lock->bast_list),
421 lock->ast_pending, lock->bast_pending,
422 lock->convert_pending, lock->lock_pending,
423 lock->cancel_pending, lock->unlock_pending,
424 kref_read(&lock->lock_refs));
425 spin_unlock(&lock->spinlock);
426
427 return out;
428 }
429
dump_lockres(struct dlm_lock_resource * res,char * buf,int len)430 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
431 {
432 struct dlm_lock *lock;
433 int i;
434 int out = 0;
435
436 out += scnprintf(buf + out, len - out, "NAME:");
437 out += stringify_lockname(res->lockname.name, res->lockname.len,
438 buf + out, len - out);
439 out += scnprintf(buf + out, len - out, "\n");
440
441 #define DEBUG_LRES_VERSION 1
442 out += scnprintf(buf + out, len - out,
443 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
444 DEBUG_LRES_VERSION,
445 res->owner, res->state, res->last_used,
446 !list_empty(&res->purge),
447 !list_empty(&res->dirty),
448 !list_empty(&res->recovering),
449 res->inflight_locks, res->migration_pending,
450 atomic_read(&res->asts_reserved),
451 kref_read(&res->refs));
452
453 /* refmap */
454 out += scnprintf(buf + out, len - out, "RMAP:");
455 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
456 buf + out, len - out);
457 out += scnprintf(buf + out, len - out, "\n");
458
459 /* lvb */
460 out += scnprintf(buf + out, len - out, "LVBX:");
461 for (i = 0; i < DLM_LVB_LEN; i++)
462 out += scnprintf(buf + out, len - out,
463 "%02x", (unsigned char)res->lvb[i]);
464 out += scnprintf(buf + out, len - out, "\n");
465
466 /* granted */
467 list_for_each_entry(lock, &res->granted, list)
468 out += dump_lock(lock, 0, buf + out, len - out);
469
470 /* converting */
471 list_for_each_entry(lock, &res->converting, list)
472 out += dump_lock(lock, 1, buf + out, len - out);
473
474 /* blocked */
475 list_for_each_entry(lock, &res->blocked, list)
476 out += dump_lock(lock, 2, buf + out, len - out);
477
478 out += scnprintf(buf + out, len - out, "\n");
479
480 return out;
481 }
482
lockres_seq_start(struct seq_file * m,loff_t * pos)483 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
484 {
485 struct debug_lockres *dl = m->private;
486 struct dlm_ctxt *dlm = dl->dl_ctxt;
487 struct dlm_lock_resource *oldres = dl->dl_res;
488 struct dlm_lock_resource *res = NULL, *iter;
489 struct list_head *track_list;
490
491 spin_lock(&dlm->track_lock);
492 if (oldres)
493 track_list = &oldres->tracking;
494 else {
495 track_list = &dlm->tracking_list;
496 if (list_empty(track_list)) {
497 dl = NULL;
498 spin_unlock(&dlm->track_lock);
499 goto bail;
500 }
501 }
502
503 list_for_each_entry(iter, track_list, tracking) {
504 if (&iter->tracking != &dlm->tracking_list) {
505 dlm_lockres_get(iter);
506 res = iter;
507 }
508 break;
509 }
510 spin_unlock(&dlm->track_lock);
511
512 if (oldres)
513 dlm_lockres_put(oldres);
514
515 dl->dl_res = res;
516
517 if (res) {
518 spin_lock(&res->spinlock);
519 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
520 spin_unlock(&res->spinlock);
521 } else
522 dl = NULL;
523
524 bail:
525 /* passed to seq_show */
526 return dl;
527 }
528
lockres_seq_stop(struct seq_file * m,void * v)529 static void lockres_seq_stop(struct seq_file *m, void *v)
530 {
531 }
532
lockres_seq_next(struct seq_file * m,void * v,loff_t * pos)533 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
534 {
535 return NULL;
536 }
537
lockres_seq_show(struct seq_file * s,void * v)538 static int lockres_seq_show(struct seq_file *s, void *v)
539 {
540 struct debug_lockres *dl = (struct debug_lockres *)v;
541
542 seq_printf(s, "%s", dl->dl_buf);
543
544 return 0;
545 }
546
547 static const struct seq_operations debug_lockres_ops = {
548 .start = lockres_seq_start,
549 .stop = lockres_seq_stop,
550 .next = lockres_seq_next,
551 .show = lockres_seq_show,
552 };
553
debug_lockres_open(struct inode * inode,struct file * file)554 static int debug_lockres_open(struct inode *inode, struct file *file)
555 {
556 struct dlm_ctxt *dlm = inode->i_private;
557 struct debug_lockres *dl;
558 void *buf;
559 int status = -ENOMEM;
560
561 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
562 if (!buf)
563 goto bail;
564
565 dl = __seq_open_private(file, &debug_lockres_ops, sizeof(*dl));
566 if (!dl)
567 goto bailfree;
568
569 dl->dl_len = PAGE_SIZE;
570 dl->dl_buf = buf;
571
572 /* ->release uses dl_ctxt after open, so it needs a real pin. */
573 dl->dl_ctxt = dlm_grab(dlm);
574 if (!dl->dl_ctxt) {
575 status = -ENOENT;
576 goto bailseq;
577 }
578
579 return 0;
580
581 bailseq:
582 seq_release_private(inode, file);
583 bailfree:
584 kfree(buf);
585 bail:
586 if (status != -ENOENT)
587 mlog_errno(status);
588 return status;
589 }
590
debug_lockres_release(struct inode * inode,struct file * file)591 static int debug_lockres_release(struct inode *inode, struct file *file)
592 {
593 struct seq_file *seq = file->private_data;
594 struct debug_lockres *dl = (struct debug_lockres *)seq->private;
595
596 if (dl->dl_res)
597 dlm_lockres_put(dl->dl_res);
598 dlm_put(dl->dl_ctxt);
599 kfree(dl->dl_buf);
600 return seq_release_private(inode, file);
601 }
602
603 static const struct file_operations debug_lockres_fops = {
604 .open = debug_lockres_open,
605 .release = debug_lockres_release,
606 .read = seq_read,
607 .llseek = seq_lseek,
608 };
609 /* end - debug lockres funcs */
610
611 /* begin - debug state funcs */
debug_state_print(struct dlm_ctxt * dlm,char * buf,int len)612 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
613 {
614 int out = 0;
615 struct dlm_reco_node_data *node;
616 char *state;
617 int cur_mles = 0, tot_mles = 0;
618 int i;
619
620 spin_lock(&dlm->spinlock);
621
622 switch (dlm->dlm_state) {
623 case DLM_CTXT_NEW:
624 state = "NEW"; break;
625 case DLM_CTXT_JOINED:
626 state = "JOINED"; break;
627 case DLM_CTXT_IN_SHUTDOWN:
628 state = "SHUTDOWN"; break;
629 case DLM_CTXT_LEAVING:
630 state = "LEAVING"; break;
631 default:
632 state = "UNKNOWN"; break;
633 }
634
635 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */
636 out += scnprintf(buf + out, len - out,
637 "Domain: %s Key: 0x%08x Protocol: %d.%d\n",
638 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
639 dlm->dlm_locking_proto.pv_minor);
640
641 /* Thread Pid: xxx Node: xxx State: xxxxx */
642 out += scnprintf(buf + out, len - out,
643 "Thread Pid: %d Node: %d State: %s\n",
644 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
645
646 /* Number of Joins: xxx Joining Node: xxx */
647 out += scnprintf(buf + out, len - out,
648 "Number of Joins: %d Joining Node: %d\n",
649 dlm->num_joins, dlm->joining_node);
650
651 /* Domain Map: xx xx xx */
652 out += scnprintf(buf + out, len - out, "Domain Map: ");
653 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
654 buf + out, len - out);
655 out += scnprintf(buf + out, len - out, "\n");
656
657 /* Exit Domain Map: xx xx xx */
658 out += scnprintf(buf + out, len - out, "Exit Domain Map: ");
659 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES,
660 buf + out, len - out);
661 out += scnprintf(buf + out, len - out, "\n");
662
663 /* Live Map: xx xx xx */
664 out += scnprintf(buf + out, len - out, "Live Map: ");
665 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
666 buf + out, len - out);
667 out += scnprintf(buf + out, len - out, "\n");
668
669 /* Lock Resources: xxx (xxx) */
670 out += scnprintf(buf + out, len - out,
671 "Lock Resources: %d (%d)\n",
672 atomic_read(&dlm->res_cur_count),
673 atomic_read(&dlm->res_tot_count));
674
675 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
676 tot_mles += atomic_read(&dlm->mle_tot_count[i]);
677
678 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
679 cur_mles += atomic_read(&dlm->mle_cur_count[i]);
680
681 /* MLEs: xxx (xxx) */
682 out += scnprintf(buf + out, len - out,
683 "MLEs: %d (%d)\n", cur_mles, tot_mles);
684
685 /* Blocking: xxx (xxx) */
686 out += scnprintf(buf + out, len - out,
687 " Blocking: %d (%d)\n",
688 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
689 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
690
691 /* Mastery: xxx (xxx) */
692 out += scnprintf(buf + out, len - out,
693 " Mastery: %d (%d)\n",
694 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
695 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
696
697 /* Migration: xxx (xxx) */
698 out += scnprintf(buf + out, len - out,
699 " Migration: %d (%d)\n",
700 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
701 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
702
703 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
704 out += scnprintf(buf + out, len - out,
705 "Lists: Dirty=%s Purge=%s PendingASTs=%s "
706 "PendingBASTs=%s\n",
707 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
708 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
709 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
710 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
711
712 /* Purge Count: xxx Refs: xxx */
713 out += scnprintf(buf + out, len - out,
714 "Purge Count: %d Refs: %d\n", dlm->purge_count,
715 kref_read(&dlm->dlm_refs));
716
717 /* Dead Node: xxx */
718 out += scnprintf(buf + out, len - out,
719 "Dead Node: %d\n", dlm->reco.dead_node);
720
721 /* What about DLM_RECO_STATE_FINALIZE? */
722 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
723 state = "ACTIVE";
724 else
725 state = "INACTIVE";
726
727 /* Recovery Pid: xxxx Master: xxx State: xxxx */
728 out += scnprintf(buf + out, len - out,
729 "Recovery Pid: %d Master: %d State: %s\n",
730 task_pid_nr(dlm->dlm_reco_thread_task),
731 dlm->reco.new_master, state);
732
733 /* Recovery Map: xx xx */
734 out += scnprintf(buf + out, len - out, "Recovery Map: ");
735 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
736 buf + out, len - out);
737 out += scnprintf(buf + out, len - out, "\n");
738
739 spin_unlock(&dlm->spinlock);
740
741 /* Recovery Node State: */
742 out += scnprintf(buf + out, len - out, "Recovery Node State:\n");
743 spin_lock(&dlm_reco_state_lock);
744 list_for_each_entry(node, &dlm->reco.node_data, list) {
745 switch (node->state) {
746 case DLM_RECO_NODE_DATA_INIT:
747 state = "INIT";
748 break;
749 case DLM_RECO_NODE_DATA_REQUESTING:
750 state = "REQUESTING";
751 break;
752 case DLM_RECO_NODE_DATA_DEAD:
753 state = "DEAD";
754 break;
755 case DLM_RECO_NODE_DATA_RECEIVING:
756 state = "RECEIVING";
757 break;
758 case DLM_RECO_NODE_DATA_REQUESTED:
759 state = "REQUESTED";
760 break;
761 case DLM_RECO_NODE_DATA_DONE:
762 state = "DONE";
763 break;
764 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
765 state = "FINALIZE-SENT";
766 break;
767 default:
768 state = "BAD";
769 break;
770 }
771 out += scnprintf(buf + out, len - out, "\t%u - %s\n",
772 node->node_num, state);
773 }
774
775 spin_unlock(&dlm_reco_state_lock);
776
777 return out;
778 }
779
debug_state_open(struct inode * inode,struct file * file)780 static int debug_state_open(struct inode *inode, struct file *file)
781 {
782 struct dlm_ctxt *dlm = inode->i_private;
783 char *buf = NULL;
784
785 buf = kzalloc(PAGE_SIZE, GFP_NOFS);
786 if (!buf)
787 return -ENOMEM;
788
789 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
790
791 file->private_data = buf;
792
793 return 0;
794 }
795
796 static const struct file_operations debug_state_fops = {
797 .open = debug_state_open,
798 .release = debug_release,
799 .read = debug_read,
800 .llseek = generic_file_llseek,
801 };
802 /* end - debug state funcs */
803
804 /* files in subroot */
dlm_debug_init(struct dlm_ctxt * dlm)805 void dlm_debug_init(struct dlm_ctxt *dlm)
806 {
807 /* for dumping dlm_ctxt */
808 debugfs_create_file(DLM_DEBUGFS_DLM_STATE, S_IFREG|S_IRUSR,
809 dlm->dlm_debugfs_subroot, dlm, &debug_state_fops);
810
811 /* for dumping lockres */
812 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE, S_IFREG|S_IRUSR,
813 dlm->dlm_debugfs_subroot, dlm, &debug_lockres_fops);
814
815 /* for dumping mles */
816 debugfs_create_file(DLM_DEBUGFS_MLE_STATE, S_IFREG|S_IRUSR,
817 dlm->dlm_debugfs_subroot, dlm, &debug_mle_fops);
818
819 /* for dumping lockres on the purge list */
820 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST, S_IFREG|S_IRUSR,
821 dlm->dlm_debugfs_subroot, dlm,
822 &debug_purgelist_fops);
823 }
824
825 /* subroot - domain dir */
dlm_create_debugfs_subroot(struct dlm_ctxt * dlm)826 void dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
827 {
828 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
829 dlm_debugfs_root);
830 }
831
dlm_destroy_debugfs_subroot(struct dlm_ctxt * dlm)832 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
833 {
834 debugfs_remove_recursive(dlm->dlm_debugfs_subroot);
835 }
836
837 /* debugfs root */
dlm_create_debugfs_root(void)838 void dlm_create_debugfs_root(void)
839 {
840 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
841 }
842
dlm_destroy_debugfs_root(void)843 void dlm_destroy_debugfs_root(void)
844 {
845 debugfs_remove(dlm_debugfs_root);
846 }
847 #endif /* CONFIG_DEBUG_FS */
848