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ocfs2/dlm: Dumps the lockres' into a debugfs file
[linux-2.6/mini2440.git] / fs / ocfs2 / dlm / dlmdebug.c
blobcccb1ce33723737b879b1a667155963139c02348
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmdebug.c
5 *
6 * debug functionality for the dlm
7 *
8 * Copyright (C) 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 *
25 */
26
27 #include <linux/types.h>
28 #include <linux/slab.h>
29 #include <linux/highmem.h>
30 #include <linux/utsname.h>
31 #include <linux/sysctl.h>
32 #include <linux/spinlock.h>
33 #include <linux/debugfs.h>
34
35 #include "cluster/heartbeat.h"
36 #include "cluster/nodemanager.h"
37 #include "cluster/tcp.h"
38
39 #include "dlmapi.h"
40 #include "dlmcommon.h"
41 #include "dlmdomain.h"
42 #include "dlmdebug.h"
43
44 #define MLOG_MASK_PREFIX ML_DLM
45 #include "cluster/masklog.h"
46
47 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
48 {
49 mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
50 res->lockname.len, res->lockname.name,
51 res->owner, res->state);
52 spin_lock(&res->spinlock);
53 __dlm_print_one_lock_resource(res);
54 spin_unlock(&res->spinlock);
55 }
56
57 static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
58 {
59 int bit;
60 assert_spin_locked(&res->spinlock);
61
62 mlog(ML_NOTICE, " refmap nodes: [ ");
63 bit = 0;
64 while (1) {
65 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
66 if (bit >= O2NM_MAX_NODES)
67 break;
68 printk("%u ", bit);
69 bit++;
70 }
71 printk("], inflight=%u\n", res->inflight_locks);
72 }
73
74 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
75 {
76 struct list_head *iter2;
77 struct dlm_lock *lock;
78
79 assert_spin_locked(&res->spinlock);
80
81 mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
82 res->lockname.len, res->lockname.name,
83 res->owner, res->state);
84 mlog(ML_NOTICE, " last used: %lu, on purge list: %s\n",
85 res->last_used, list_empty(&res->purge) ? "no" : "yes");
86 dlm_print_lockres_refmap(res);
87 mlog(ML_NOTICE, " granted queue: \n");
88 list_for_each(iter2, &res->granted) {
89 lock = list_entry(iter2, struct dlm_lock, list);
90 spin_lock(&lock->spinlock);
91 mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, "
92 "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
93 lock->ml.type, lock->ml.convert_type, lock->ml.node,
94 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
95 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
96 list_empty(&lock->ast_list) ? 'y' : 'n',
97 lock->ast_pending ? 'y' : 'n',
98 list_empty(&lock->bast_list) ? 'y' : 'n',
99 lock->bast_pending ? 'y' : 'n');
100 spin_unlock(&lock->spinlock);
101 }
102 mlog(ML_NOTICE, " converting queue: \n");
103 list_for_each(iter2, &res->converting) {
104 lock = list_entry(iter2, struct dlm_lock, list);
105 spin_lock(&lock->spinlock);
106 mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, "
107 "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
108 lock->ml.type, lock->ml.convert_type, lock->ml.node,
109 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
110 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
111 list_empty(&lock->ast_list) ? 'y' : 'n',
112 lock->ast_pending ? 'y' : 'n',
113 list_empty(&lock->bast_list) ? 'y' : 'n',
114 lock->bast_pending ? 'y' : 'n');
115 spin_unlock(&lock->spinlock);
116 }
117 mlog(ML_NOTICE, " blocked queue: \n");
118 list_for_each(iter2, &res->blocked) {
119 lock = list_entry(iter2, struct dlm_lock, list);
120 spin_lock(&lock->spinlock);
121 mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, "
122 "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
123 lock->ml.type, lock->ml.convert_type, lock->ml.node,
124 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
125 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
126 list_empty(&lock->ast_list) ? 'y' : 'n',
127 lock->ast_pending ? 'y' : 'n',
128 list_empty(&lock->bast_list) ? 'y' : 'n',
129 lock->bast_pending ? 'y' : 'n');
130 spin_unlock(&lock->spinlock);
131 }
132 }
133
134 void dlm_print_one_lock(struct dlm_lock *lockid)
135 {
136 dlm_print_one_lock_resource(lockid->lockres);
137 }
138 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
139
140 #if 0
141 void dlm_dump_lock_resources(struct dlm_ctxt *dlm)
142 {
143 struct dlm_lock_resource *res;
144 struct hlist_node *iter;
145 struct hlist_head *bucket;
146 int i;
147
148 mlog(ML_NOTICE, "struct dlm_ctxt: %s, node=%u, key=%u\n",
149 dlm->name, dlm->node_num, dlm->key);
150 if (!dlm || !dlm->name) {
151 mlog(ML_ERROR, "dlm=%p\n", dlm);
152 return;
153 }
154
155 spin_lock(&dlm->spinlock);
156 for (i=0; i<DLM_HASH_BUCKETS; i++) {
157 bucket = dlm_lockres_hash(dlm, i);
158 hlist_for_each_entry(res, iter, bucket, hash_node)
159 dlm_print_one_lock_resource(res);
160 }
161 spin_unlock(&dlm->spinlock);
162 }
163 #endif /* 0 */
164
165 static const char *dlm_errnames[] = {
166 [DLM_NORMAL] = "DLM_NORMAL",
167 [DLM_GRANTED] = "DLM_GRANTED",
168 [DLM_DENIED] = "DLM_DENIED",
169 [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS",
170 [DLM_WORKING] = "DLM_WORKING",
171 [DLM_BLOCKED] = "DLM_BLOCKED",
172 [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN",
173 [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD",
174 [DLM_SYSERR] = "DLM_SYSERR",
175 [DLM_NOSUPPORT] = "DLM_NOSUPPORT",
176 [DLM_CANCELGRANT] = "DLM_CANCELGRANT",
177 [DLM_IVLOCKID] = "DLM_IVLOCKID",
178 [DLM_SYNC] = "DLM_SYNC",
179 [DLM_BADTYPE] = "DLM_BADTYPE",
180 [DLM_BADRESOURCE] = "DLM_BADRESOURCE",
181 [DLM_MAXHANDLES] = "DLM_MAXHANDLES",
182 [DLM_NOCLINFO] = "DLM_NOCLINFO",
183 [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR",
184 [DLM_NOPURGED] = "DLM_NOPURGED",
185 [DLM_BADARGS] = "DLM_BADARGS",
186 [DLM_VOID] = "DLM_VOID",
187 [DLM_NOTQUEUED] = "DLM_NOTQUEUED",
188 [DLM_IVBUFLEN] = "DLM_IVBUFLEN",
189 [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT",
190 [DLM_BADPARAM] = "DLM_BADPARAM",
191 [DLM_VALNOTVALID] = "DLM_VALNOTVALID",
192 [DLM_REJECTED] = "DLM_REJECTED",
193 [DLM_ABORT] = "DLM_ABORT",
194 [DLM_CANCEL] = "DLM_CANCEL",
195 [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE",
196 [DLM_DEADLOCK] = "DLM_DEADLOCK",
197 [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS",
198 [DLM_FORWARD] = "DLM_FORWARD",
199 [DLM_TIMEOUT] = "DLM_TIMEOUT",
200 [DLM_IVGROUPID] = "DLM_IVGROUPID",
201 [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT",
202 [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH",
203 [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION",
204 [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ",
205 [DLM_RECOVERING] = "DLM_RECOVERING",
206 [DLM_MIGRATING] = "DLM_MIGRATING",
207 [DLM_MAXSTATS] = "DLM_MAXSTATS",
208 };
209
210 static const char *dlm_errmsgs[] = {
211 [DLM_NORMAL] = "request in progress",
212 [DLM_GRANTED] = "request granted",
213 [DLM_DENIED] = "request denied",
214 [DLM_DENIED_NOLOCKS] = "request denied, out of system resources",
215 [DLM_WORKING] = "async request in progress",
216 [DLM_BLOCKED] = "lock request blocked",
217 [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock",
218 [DLM_DENIED_GRACE_PERIOD] = "topological change in progress",
219 [DLM_SYSERR] = "system error",
220 [DLM_NOSUPPORT] = "unsupported",
221 [DLM_CANCELGRANT] = "can't cancel convert: already granted",
222 [DLM_IVLOCKID] = "bad lockid",
223 [DLM_SYNC] = "synchronous request granted",
224 [DLM_BADTYPE] = "bad resource type",
225 [DLM_BADRESOURCE] = "bad resource handle",
226 [DLM_MAXHANDLES] = "no more resource handles",
227 [DLM_NOCLINFO] = "can't contact cluster manager",
228 [DLM_NOLOCKMGR] = "can't contact lock manager",
229 [DLM_NOPURGED] = "can't contact purge daemon",
230 [DLM_BADARGS] = "bad api args",
231 [DLM_VOID] = "no status",
232 [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed",
233 [DLM_IVBUFLEN] = "invalid resource name length",
234 [DLM_CVTUNGRANT] = "attempted to convert ungranted lock",
235 [DLM_BADPARAM] = "invalid lock mode specified",
236 [DLM_VALNOTVALID] = "value block has been invalidated",
237 [DLM_REJECTED] = "request rejected, unrecognized client",
238 [DLM_ABORT] = "blocked lock request cancelled",
239 [DLM_CANCEL] = "conversion request cancelled",
240 [DLM_IVRESHANDLE] = "invalid resource handle",
241 [DLM_DEADLOCK] = "deadlock recovery refused this request",
242 [DLM_DENIED_NOASTS] = "failed to allocate AST",
243 [DLM_FORWARD] = "request must wait for primary's response",
244 [DLM_TIMEOUT] = "timeout value for lock has expired",
245 [DLM_IVGROUPID] = "invalid group specification",
246 [DLM_VERS_CONFLICT] = "version conflicts prevent request handling",
247 [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong",
248 [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device",
249 [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ",
250 [DLM_RECOVERING] = "lock resource being recovered",
251 [DLM_MIGRATING] = "lock resource being migrated",
252 [DLM_MAXSTATS] = "invalid error number",
253 };
254
255 const char *dlm_errmsg(enum dlm_status err)
256 {
257 if (err >= DLM_MAXSTATS || err < 0)
258 return dlm_errmsgs[DLM_MAXSTATS];
259 return dlm_errmsgs[err];
260 }
261 EXPORT_SYMBOL_GPL(dlm_errmsg);
262
263 const char *dlm_errname(enum dlm_status err)
264 {
265 if (err >= DLM_MAXSTATS || err < 0)
266 return dlm_errnames[DLM_MAXSTATS];
267 return dlm_errnames[err];
268 }
269 EXPORT_SYMBOL_GPL(dlm_errname);
270
271
272 #ifdef CONFIG_DEBUG_FS
273
274 static struct dentry *dlm_debugfs_root = NULL;
275
276 /* NOTE: This function converts a lockname into a string. It uses knowledge
277 * of the format of the lockname that should be outside the purview of the dlm.
278 * We are adding only to make dlm debugging slightly easier.
279 *
280 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
281 */
282 static int stringify_lockname(const char *lockname, int locklen,
283 char *buf, int len)
284 {
285 int out = 0;
286 __be64 inode_blkno_be;
287
288 #define OCFS2_DENTRY_LOCK_INO_START 18
289 if (*lockname == 'N') {
290 memcpy((__be64 *)&inode_blkno_be,
291 (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
292 sizeof(__be64));
293 out += snprintf(buf + out, len - out, "%.*s%08x",
294 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
295 (unsigned int)be64_to_cpu(inode_blkno_be));
296 } else
297 out += snprintf(buf + out, len - out, "%.*s",
298 locklen, lockname);
299 return out;
300 }
301
302 #define DLM_DEBUGFS_DIR "o2dlm"
303 #define DLM_DEBUGFS_DLM_STATE "dlm_state"
304 #define DLM_DEBUGFS_LOCKING_STATE "locking_state"
305
306 /* begin - utils funcs */
307 static void dlm_debug_free(struct kref *kref)
308 {
309 struct dlm_debug_ctxt *dc;
310
311 dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
312
313 kfree(dc);
314 }
315
316 void dlm_debug_put(struct dlm_debug_ctxt *dc)
317 {
318 if (dc)
319 kref_put(&dc->debug_refcnt, dlm_debug_free);
320 }
321
322 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
323 {
324 kref_get(&dc->debug_refcnt);
325 }
326
327 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
328 char *buf, int len)
329 {
330 int out = 0;
331 int i = -1;
332
333 while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
334 out += snprintf(buf + out, len - out, "%d ", i);
335
336 return out;
337 }
338
339 static struct debug_buffer *debug_buffer_allocate(void)
340 {
341 struct debug_buffer *db = NULL;
342
343 db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
344 if (!db)
345 goto bail;
346
347 db->len = PAGE_SIZE;
348 db->buf = kmalloc(db->len, GFP_KERNEL);
349 if (!db->buf)
350 goto bail;
351
352 return db;
353 bail:
354 kfree(db);
355 return NULL;
356 }
357
358 static ssize_t debug_buffer_read(struct file *file, char __user *buf,
359 size_t nbytes, loff_t *ppos)
360 {
361 struct debug_buffer *db = file->private_data;
362
363 return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
364 }
365
366 static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
367 {
368 struct debug_buffer *db = file->private_data;
369 loff_t new = -1;
370
371 switch (whence) {
372 case 0:
373 new = off;
374 break;
375 case 1:
376 new = file->f_pos + off;
377 break;
378 }
379
380 if (new < 0 || new > db->len)
381 return -EINVAL;
382
383 return (file->f_pos = new);
384 }
385
386 static int debug_buffer_release(struct inode *inode, struct file *file)
387 {
388 struct debug_buffer *db = (struct debug_buffer *)file->private_data;
389
390 if (db)
391 kfree(db->buf);
392 kfree(db);
393
394 return 0;
395 }
396 /* end - util funcs */
397
398 /* begin - debug lockres funcs */
399 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
400 {
401 int out;
402
403 #define DEBUG_LOCK_VERSION 1
404 spin_lock(&lock->spinlock);
405 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
406 "%d,%d,%d,%d\n",
407 DEBUG_LOCK_VERSION,
408 list_type, lock->ml.type, lock->ml.convert_type,
409 lock->ml.node,
410 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
411 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
412 !list_empty(&lock->ast_list),
413 !list_empty(&lock->bast_list),
414 lock->ast_pending, lock->bast_pending,
415 lock->convert_pending, lock->lock_pending,
416 lock->cancel_pending, lock->unlock_pending,
417 atomic_read(&lock->lock_refs.refcount));
418 spin_unlock(&lock->spinlock);
419
420 return out;
421 }
422
423 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
424 {
425 struct dlm_lock *lock;
426 int i;
427 int out = 0;
428
429 out += snprintf(buf + out, len - out, "NAME:");
430 out += stringify_lockname(res->lockname.name, res->lockname.len,
431 buf + out, len - out);
432 out += snprintf(buf + out, len - out, "\n");
433
434 #define DEBUG_LRES_VERSION 1
435 out += snprintf(buf + out, len - out,
436 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
437 DEBUG_LRES_VERSION,
438 res->owner, res->state, res->last_used,
439 !list_empty(&res->purge),
440 !list_empty(&res->dirty),
441 !list_empty(&res->recovering),
442 res->inflight_locks, res->migration_pending,
443 atomic_read(&res->asts_reserved),
444 atomic_read(&res->refs.refcount));
445
446 /* refmap */
447 out += snprintf(buf + out, len - out, "RMAP:");
448 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
449 buf + out, len - out);
450 out += snprintf(buf + out, len - out, "\n");
451
452 /* lvb */
453 out += snprintf(buf + out, len - out, "LVBX:");
454 for (i = 0; i < DLM_LVB_LEN; i++)
455 out += snprintf(buf + out, len - out,
456 "%02x", (unsigned char)res->lvb[i]);
457 out += snprintf(buf + out, len - out, "\n");
458
459 /* granted */
460 list_for_each_entry(lock, &res->granted, list)
461 out += dump_lock(lock, 0, buf + out, len - out);
462
463 /* converting */
464 list_for_each_entry(lock, &res->converting, list)
465 out += dump_lock(lock, 1, buf + out, len - out);
466
467 /* blocked */
468 list_for_each_entry(lock, &res->blocked, list)
469 out += dump_lock(lock, 2, buf + out, len - out);
470
471 out += snprintf(buf + out, len - out, "\n");
472
473 return out;
474 }
475
476 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
477 {
478 struct debug_lockres *dl = m->private;
479 struct dlm_ctxt *dlm = dl->dl_ctxt;
480 struct dlm_lock_resource *res = NULL;
481
482 spin_lock(&dlm->spinlock);
483
484 if (dl->dl_res) {
485 list_for_each_entry(res, &dl->dl_res->tracking, tracking) {
486 if (dl->dl_res) {
487 dlm_lockres_put(dl->dl_res);
488 dl->dl_res = NULL;
489 }
490 if (&res->tracking == &dlm->tracking_list) {
491 mlog(0, "End of list found, %p\n", res);
492 dl = NULL;
493 break;
494 }
495 dlm_lockres_get(res);
496 dl->dl_res = res;
497 break;
498 }
499 } else {
500 if (!list_empty(&dlm->tracking_list)) {
501 list_for_each_entry(res, &dlm->tracking_list, tracking)
502 break;
503 dlm_lockres_get(res);
504 dl->dl_res = res;
505 } else
506 dl = NULL;
507 }
508
509 if (dl) {
510 spin_lock(&dl->dl_res->spinlock);
511 dump_lockres(dl->dl_res, dl->dl_buf, dl->dl_len - 1);
512 spin_unlock(&dl->dl_res->spinlock);
513 }
514
515 spin_unlock(&dlm->spinlock);
516
517 return dl;
518 }
519
520 static void lockres_seq_stop(struct seq_file *m, void *v)
521 {
522 }
523
524 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
525 {
526 return NULL;
527 }
528
529 static int lockres_seq_show(struct seq_file *s, void *v)
530 {
531 struct debug_lockres *dl = (struct debug_lockres *)v;
532
533 seq_printf(s, "%s", dl->dl_buf);
534
535 return 0;
536 }
537
538 static struct seq_operations debug_lockres_ops = {
539 .start = lockres_seq_start,
540 .stop = lockres_seq_stop,
541 .next = lockres_seq_next,
542 .show = lockres_seq_show,
543 };
544
545 static int debug_lockres_open(struct inode *inode, struct file *file)
546 {
547 struct dlm_ctxt *dlm = inode->i_private;
548 int ret = -ENOMEM;
549 struct seq_file *seq;
550 struct debug_lockres *dl = NULL;
551
552 dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
553 if (!dl) {
554 mlog_errno(ret);
555 goto bail;
556 }
557
558 dl->dl_len = PAGE_SIZE;
559 dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
560 if (!dl->dl_buf) {
561 mlog_errno(ret);
562 goto bail;
563 }
564
565 ret = seq_open(file, &debug_lockres_ops);
566 if (ret) {
567 mlog_errno(ret);
568 goto bail;
569 }
570
571 seq = (struct seq_file *) file->private_data;
572 seq->private = dl;
573
574 dlm_grab(dlm);
575 dl->dl_ctxt = dlm;
576
577 return 0;
578 bail:
579 if (dl)
580 kfree(dl->dl_buf);
581 kfree(dl);
582 return ret;
583 }
584
585 static int debug_lockres_release(struct inode *inode, struct file *file)
586 {
587 struct seq_file *seq = (struct seq_file *)file->private_data;
588 struct debug_lockres *dl = (struct debug_lockres *)seq->private;
589
590 if (dl->dl_res)
591 dlm_lockres_put(dl->dl_res);
592 dlm_put(dl->dl_ctxt);
593 kfree(dl->dl_buf);
594 return seq_release_private(inode, file);
595 }
596
597 static struct file_operations debug_lockres_fops = {
598 .open = debug_lockres_open,
599 .release = debug_lockres_release,
600 .read = seq_read,
601 .llseek = seq_lseek,
602 };
603 /* end - debug lockres funcs */
604
605 /* begin - debug state funcs */
606 static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
607 {
608 int out = 0;
609 struct dlm_reco_node_data *node;
610 char *state;
611 int lres, rres, ures, tres;
612
613 lres = atomic_read(&dlm->local_resources);
614 rres = atomic_read(&dlm->remote_resources);
615 ures = atomic_read(&dlm->unknown_resources);
616 tres = lres + rres + ures;
617
618 spin_lock(&dlm->spinlock);
619
620 switch (dlm->dlm_state) {
621 case DLM_CTXT_NEW:
622 state = "NEW"; break;
623 case DLM_CTXT_JOINED:
624 state = "JOINED"; break;
625 case DLM_CTXT_IN_SHUTDOWN:
626 state = "SHUTDOWN"; break;
627 case DLM_CTXT_LEAVING:
628 state = "LEAVING"; break;
629 default:
630 state = "UNKNOWN"; break;
631 }
632
633 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */
634 out += snprintf(db->buf + out, db->len - out,
635 "Domain: %s Key: 0x%08x\n", dlm->name, dlm->key);
636
637 /* Thread Pid: xxx Node: xxx State: xxxxx */
638 out += snprintf(db->buf + out, db->len - out,
639 "Thread Pid: %d Node: %d State: %s\n",
640 dlm->dlm_thread_task->pid, dlm->node_num, state);
641
642 /* Number of Joins: xxx Joining Node: xxx */
643 out += snprintf(db->buf + out, db->len - out,
644 "Number of Joins: %d Joining Node: %d\n",
645 dlm->num_joins, dlm->joining_node);
646
647 /* Domain Map: xx xx xx */
648 out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
649 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
650 db->buf + out, db->len - out);
651 out += snprintf(db->buf + out, db->len - out, "\n");
652
653 /* Live Map: xx xx xx */
654 out += snprintf(db->buf + out, db->len - out, "Live Map: ");
655 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
656 db->buf + out, db->len - out);
657 out += snprintf(db->buf + out, db->len - out, "\n");
658
659 /* Mastered Resources Total: xxx Locally: xxx Remotely: ... */
660 out += snprintf(db->buf + out, db->len - out,
661 "Mastered Resources Total: %d Locally: %d "
662 "Remotely: %d Unknown: %d\n",
663 tres, lres, rres, ures);
664
665 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
666 out += snprintf(db->buf + out, db->len - out,
667 "Lists: Dirty=%s Purge=%s PendingASTs=%s "
668 "PendingBASTs=%s Master=%s\n",
669 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
670 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
671 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
672 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"),
673 (list_empty(&dlm->master_list) ? "Empty" : "InUse"));
674
675 /* Purge Count: xxx Refs: xxx */
676 out += snprintf(db->buf + out, db->len - out,
677 "Purge Count: %d Refs: %d\n", dlm->purge_count,
678 atomic_read(&dlm->dlm_refs.refcount));
679
680 /* Dead Node: xxx */
681 out += snprintf(db->buf + out, db->len - out,
682 "Dead Node: %d\n", dlm->reco.dead_node);
683
684 /* What about DLM_RECO_STATE_FINALIZE? */
685 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
686 state = "ACTIVE";
687 else
688 state = "INACTIVE";
689
690 /* Recovery Pid: xxxx Master: xxx State: xxxx */
691 out += snprintf(db->buf + out, db->len - out,
692 "Recovery Pid: %d Master: %d State: %s\n",
693 dlm->dlm_reco_thread_task->pid,
694 dlm->reco.new_master, state);
695
696 /* Recovery Map: xx xx */
697 out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
698 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
699 db->buf + out, db->len - out);
700 out += snprintf(db->buf + out, db->len - out, "\n");
701
702 /* Recovery Node State: */
703 out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
704 list_for_each_entry(node, &dlm->reco.node_data, list) {
705 switch (node->state) {
706 case DLM_RECO_NODE_DATA_INIT:
707 state = "INIT";
708 break;
709 case DLM_RECO_NODE_DATA_REQUESTING:
710 state = "REQUESTING";
711 break;
712 case DLM_RECO_NODE_DATA_DEAD:
713 state = "DEAD";
714 break;
715 case DLM_RECO_NODE_DATA_RECEIVING:
716 state = "RECEIVING";
717 break;
718 case DLM_RECO_NODE_DATA_REQUESTED:
719 state = "REQUESTED";
720 break;
721 case DLM_RECO_NODE_DATA_DONE:
722 state = "DONE";
723 break;
724 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
725 state = "FINALIZE-SENT";
726 break;
727 default:
728 state = "BAD";
729 break;
730 }
731 out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
732 node->node_num, state);
733 }
734
735 spin_unlock(&dlm->spinlock);
736
737 return out;
738 }
739
740 static int debug_state_open(struct inode *inode, struct file *file)
741 {
742 struct dlm_ctxt *dlm = inode->i_private;
743 struct debug_buffer *db = NULL;
744
745 db = debug_buffer_allocate();
746 if (!db)
747 goto bail;
748
749 db->len = debug_state_print(dlm, db);
750
751 file->private_data = db;
752
753 return 0;
754 bail:
755 return -ENOMEM;
756 }
757
758 static struct file_operations debug_state_fops = {
759 .open = debug_state_open,
760 .release = debug_buffer_release,
761 .read = debug_buffer_read,
762 .llseek = debug_buffer_llseek,
763 };
764 /* end - debug state funcs */
765
766 /* files in subroot */
767 int dlm_debug_init(struct dlm_ctxt *dlm)
768 {
769 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
770
771 /* for dumping dlm_ctxt */
772 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
773 S_IFREG|S_IRUSR,
774 dlm->dlm_debugfs_subroot,
775 dlm, &debug_state_fops);
776 if (!dc->debug_state_dentry) {
777 mlog_errno(-ENOMEM);
778 goto bail;
779 }
780
781 /* for dumping lockres */
782 dc->debug_lockres_dentry =
783 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
784 S_IFREG|S_IRUSR,
785 dlm->dlm_debugfs_subroot,
786 dlm, &debug_lockres_fops);
787 if (!dc->debug_lockres_dentry) {
788 mlog_errno(-ENOMEM);
789 goto bail;
790 }
791
792 dlm_debug_get(dc);
793 return 0;
794
795 bail:
796 dlm_debug_shutdown(dlm);
797 return -ENOMEM;
798 }
799
800 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
801 {
802 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
803
804 if (dc) {
805 if (dc->debug_lockres_dentry)
806 debugfs_remove(dc->debug_lockres_dentry);
807 if (dc->debug_state_dentry)
808 debugfs_remove(dc->debug_state_dentry);
809 dlm_debug_put(dc);
810 }
811 }
812
813 /* subroot - domain dir */
814 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
815 {
816 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
817 dlm_debugfs_root);
818 if (!dlm->dlm_debugfs_subroot) {
819 mlog_errno(-ENOMEM);
820 goto bail;
821 }
822
823 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
824 GFP_KERNEL);
825 if (!dlm->dlm_debug_ctxt) {
826 mlog_errno(-ENOMEM);
827 goto bail;
828 }
829 kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
830
831 return 0;
832 bail:
833 dlm_destroy_debugfs_subroot(dlm);
834 return -ENOMEM;
835 }
836
837 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
838 {
839 if (dlm->dlm_debugfs_subroot)
840 debugfs_remove(dlm->dlm_debugfs_subroot);
841 }
842
843 /* debugfs root */
844 int dlm_create_debugfs_root(void)
845 {
846 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
847 if (!dlm_debugfs_root) {
848 mlog_errno(-ENOMEM);
849 return -ENOMEM;
850 }
851 return 0;
852 }
853
854 void dlm_destroy_debugfs_root(void)
855 {
856 if (dlm_debugfs_root)
857 debugfs_remove(dlm_debugfs_root);
858 }
859 #endif /* CONFIG_DEBUG_FS */
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