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include: replace linux/module.h with "struct module" wherever possible
[linux-2.6/next.git] / fs / ocfs2 / dlm / dlmdebug.c
blob56f82cb912e379e4149ab5454261a9bb6bdadf67
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, 2008 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/sysctl.h>
31 #include <linux/spinlock.h>
32 #include <linux/debugfs.h>
33
34 #include "cluster/heartbeat.h"
35 #include "cluster/nodemanager.h"
36 #include "cluster/tcp.h"
37
38 #include "dlmapi.h"
39 #include "dlmcommon.h"
40 #include "dlmdomain.h"
41 #include "dlmdebug.h"
42
43 #define MLOG_MASK_PREFIX ML_DLM
44 #include "cluster/masklog.h"
45
46 static int stringify_lockname(const char *lockname, int locklen, char *buf,
47 int len);
48
49 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
50 {
51 spin_lock(&res->spinlock);
52 __dlm_print_one_lock_resource(res);
53 spin_unlock(&res->spinlock);
54 }
55
56 static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
57 {
58 int bit;
59 assert_spin_locked(&res->spinlock);
60
61 printk(" refmap nodes: [ ");
62 bit = 0;
63 while (1) {
64 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
65 if (bit >= O2NM_MAX_NODES)
66 break;
67 printk("%u ", bit);
68 bit++;
69 }
70 printk("], inflight=%u\n", res->inflight_locks);
71 }
72
73 static void __dlm_print_lock(struct dlm_lock *lock)
74 {
75 spin_lock(&lock->spinlock);
76
77 printk(" type=%d, conv=%d, node=%u, cookie=%u:%llu, "
78 "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), "
79 "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n",
80 lock->ml.type, lock->ml.convert_type, lock->ml.node,
81 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
82 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
83 atomic_read(&lock->lock_refs.refcount),
84 (list_empty(&lock->ast_list) ? 'y' : 'n'),
85 (lock->ast_pending ? 'y' : 'n'),
86 (list_empty(&lock->bast_list) ? 'y' : 'n'),
87 (lock->bast_pending ? 'y' : 'n'),
88 (lock->convert_pending ? 'y' : 'n'),
89 (lock->lock_pending ? 'y' : 'n'),
90 (lock->cancel_pending ? 'y' : 'n'),
91 (lock->unlock_pending ? 'y' : 'n'));
92
93 spin_unlock(&lock->spinlock);
94 }
95
96 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
97 {
98 struct list_head *iter2;
99 struct dlm_lock *lock;
100 char buf[DLM_LOCKID_NAME_MAX];
101
102 assert_spin_locked(&res->spinlock);
103
104 stringify_lockname(res->lockname.name, res->lockname.len,
105 buf, sizeof(buf));
106 printk("lockres: %s, owner=%u, state=%u\n",
107 buf, res->owner, res->state);
108 printk(" last used: %lu, refcnt: %u, on purge list: %s\n",
109 res->last_used, atomic_read(&res->refs.refcount),
110 list_empty(&res->purge) ? "no" : "yes");
111 printk(" on dirty list: %s, on reco list: %s, "
112 "migrating pending: %s\n",
113 list_empty(&res->dirty) ? "no" : "yes",
114 list_empty(&res->recovering) ? "no" : "yes",
115 res->migration_pending ? "yes" : "no");
116 printk(" inflight locks: %d, asts reserved: %d\n",
117 res->inflight_locks, atomic_read(&res->asts_reserved));
118 dlm_print_lockres_refmap(res);
119 printk(" granted queue:\n");
120 list_for_each(iter2, &res->granted) {
121 lock = list_entry(iter2, struct dlm_lock, list);
122 __dlm_print_lock(lock);
123 }
124 printk(" converting queue:\n");
125 list_for_each(iter2, &res->converting) {
126 lock = list_entry(iter2, struct dlm_lock, list);
127 __dlm_print_lock(lock);
128 }
129 printk(" blocked queue:\n");
130 list_for_each(iter2, &res->blocked) {
131 lock = list_entry(iter2, struct dlm_lock, list);
132 __dlm_print_lock(lock);
133 }
134 }
135
136 void dlm_print_one_lock(struct dlm_lock *lockid)
137 {
138 dlm_print_one_lock_resource(lockid->lockres);
139 }
140 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
141
142 static const char *dlm_errnames[] = {
143 [DLM_NORMAL] = "DLM_NORMAL",
144 [DLM_GRANTED] = "DLM_GRANTED",
145 [DLM_DENIED] = "DLM_DENIED",
146 [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS",
147 [DLM_WORKING] = "DLM_WORKING",
148 [DLM_BLOCKED] = "DLM_BLOCKED",
149 [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN",
150 [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD",
151 [DLM_SYSERR] = "DLM_SYSERR",
152 [DLM_NOSUPPORT] = "DLM_NOSUPPORT",
153 [DLM_CANCELGRANT] = "DLM_CANCELGRANT",
154 [DLM_IVLOCKID] = "DLM_IVLOCKID",
155 [DLM_SYNC] = "DLM_SYNC",
156 [DLM_BADTYPE] = "DLM_BADTYPE",
157 [DLM_BADRESOURCE] = "DLM_BADRESOURCE",
158 [DLM_MAXHANDLES] = "DLM_MAXHANDLES",
159 [DLM_NOCLINFO] = "DLM_NOCLINFO",
160 [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR",
161 [DLM_NOPURGED] = "DLM_NOPURGED",
162 [DLM_BADARGS] = "DLM_BADARGS",
163 [DLM_VOID] = "DLM_VOID",
164 [DLM_NOTQUEUED] = "DLM_NOTQUEUED",
165 [DLM_IVBUFLEN] = "DLM_IVBUFLEN",
166 [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT",
167 [DLM_BADPARAM] = "DLM_BADPARAM",
168 [DLM_VALNOTVALID] = "DLM_VALNOTVALID",
169 [DLM_REJECTED] = "DLM_REJECTED",
170 [DLM_ABORT] = "DLM_ABORT",
171 [DLM_CANCEL] = "DLM_CANCEL",
172 [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE",
173 [DLM_DEADLOCK] = "DLM_DEADLOCK",
174 [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS",
175 [DLM_FORWARD] = "DLM_FORWARD",
176 [DLM_TIMEOUT] = "DLM_TIMEOUT",
177 [DLM_IVGROUPID] = "DLM_IVGROUPID",
178 [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT",
179 [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH",
180 [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION",
181 [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ",
182 [DLM_RECOVERING] = "DLM_RECOVERING",
183 [DLM_MIGRATING] = "DLM_MIGRATING",
184 [DLM_MAXSTATS] = "DLM_MAXSTATS",
185 };
186
187 static const char *dlm_errmsgs[] = {
188 [DLM_NORMAL] = "request in progress",
189 [DLM_GRANTED] = "request granted",
190 [DLM_DENIED] = "request denied",
191 [DLM_DENIED_NOLOCKS] = "request denied, out of system resources",
192 [DLM_WORKING] = "async request in progress",
193 [DLM_BLOCKED] = "lock request blocked",
194 [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock",
195 [DLM_DENIED_GRACE_PERIOD] = "topological change in progress",
196 [DLM_SYSERR] = "system error",
197 [DLM_NOSUPPORT] = "unsupported",
198 [DLM_CANCELGRANT] = "can't cancel convert: already granted",
199 [DLM_IVLOCKID] = "bad lockid",
200 [DLM_SYNC] = "synchronous request granted",
201 [DLM_BADTYPE] = "bad resource type",
202 [DLM_BADRESOURCE] = "bad resource handle",
203 [DLM_MAXHANDLES] = "no more resource handles",
204 [DLM_NOCLINFO] = "can't contact cluster manager",
205 [DLM_NOLOCKMGR] = "can't contact lock manager",
206 [DLM_NOPURGED] = "can't contact purge daemon",
207 [DLM_BADARGS] = "bad api args",
208 [DLM_VOID] = "no status",
209 [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed",
210 [DLM_IVBUFLEN] = "invalid resource name length",
211 [DLM_CVTUNGRANT] = "attempted to convert ungranted lock",
212 [DLM_BADPARAM] = "invalid lock mode specified",
213 [DLM_VALNOTVALID] = "value block has been invalidated",
214 [DLM_REJECTED] = "request rejected, unrecognized client",
215 [DLM_ABORT] = "blocked lock request cancelled",
216 [DLM_CANCEL] = "conversion request cancelled",
217 [DLM_IVRESHANDLE] = "invalid resource handle",
218 [DLM_DEADLOCK] = "deadlock recovery refused this request",
219 [DLM_DENIED_NOASTS] = "failed to allocate AST",
220 [DLM_FORWARD] = "request must wait for primary's response",
221 [DLM_TIMEOUT] = "timeout value for lock has expired",
222 [DLM_IVGROUPID] = "invalid group specification",
223 [DLM_VERS_CONFLICT] = "version conflicts prevent request handling",
224 [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong",
225 [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device",
226 [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ",
227 [DLM_RECOVERING] = "lock resource being recovered",
228 [DLM_MIGRATING] = "lock resource being migrated",
229 [DLM_MAXSTATS] = "invalid error number",
230 };
231
232 const char *dlm_errmsg(enum dlm_status err)
233 {
234 if (err >= DLM_MAXSTATS || err < 0)
235 return dlm_errmsgs[DLM_MAXSTATS];
236 return dlm_errmsgs[err];
237 }
238 EXPORT_SYMBOL_GPL(dlm_errmsg);
239
240 const char *dlm_errname(enum dlm_status err)
241 {
242 if (err >= DLM_MAXSTATS || err < 0)
243 return dlm_errnames[DLM_MAXSTATS];
244 return dlm_errnames[err];
245 }
246 EXPORT_SYMBOL_GPL(dlm_errname);
247
248 /* NOTE: This function converts a lockname into a string. It uses knowledge
249 * of the format of the lockname that should be outside the purview of the dlm.
250 * We are adding only to make dlm debugging slightly easier.
251 *
252 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
253 */
254 static int stringify_lockname(const char *lockname, int locklen, char *buf,
255 int len)
256 {
257 int out = 0;
258 __be64 inode_blkno_be;
259
260 #define OCFS2_DENTRY_LOCK_INO_START 18
261 if (*lockname == 'N') {
262 memcpy((__be64 *)&inode_blkno_be,
263 (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
264 sizeof(__be64));
265 out += snprintf(buf + out, len - out, "%.*s%08x",
266 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
267 (unsigned int)be64_to_cpu(inode_blkno_be));
268 } else
269 out += snprintf(buf + out, len - out, "%.*s",
270 locklen, lockname);
271 return out;
272 }
273
274 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
275 char *buf, int len)
276 {
277 int out = 0;
278 int i = -1;
279
280 while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
281 out += snprintf(buf + out, len - out, "%d ", i);
282
283 return out;
284 }
285
286 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
287 {
288 int out = 0;
289 char *mle_type;
290
291 if (mle->type == DLM_MLE_BLOCK)
292 mle_type = "BLK";
293 else if (mle->type == DLM_MLE_MASTER)
294 mle_type = "MAS";
295 else
296 mle_type = "MIG";
297
298 out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
299 out += snprintf(buf + out, len - out,
300 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
301 mle_type, mle->master, mle->new_master,
302 !list_empty(&mle->hb_events),
303 !!mle->inuse,
304 atomic_read(&mle->mle_refs.refcount));
305
306 out += snprintf(buf + out, len - out, "Maybe=");
307 out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
308 buf + out, len - out);
309 out += snprintf(buf + out, len - out, "\n");
310
311 out += snprintf(buf + out, len - out, "Vote=");
312 out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
313 buf + out, len - out);
314 out += snprintf(buf + out, len - out, "\n");
315
316 out += snprintf(buf + out, len - out, "Response=");
317 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
318 buf + out, len - out);
319 out += snprintf(buf + out, len - out, "\n");
320
321 out += snprintf(buf + out, len - out, "Node=");
322 out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
323 buf + out, len - out);
324 out += snprintf(buf + out, len - out, "\n");
325
326 out += snprintf(buf + out, len - out, "\n");
327
328 return out;
329 }
330
331 void dlm_print_one_mle(struct dlm_master_list_entry *mle)
332 {
333 char *buf;
334
335 buf = (char *) get_zeroed_page(GFP_NOFS);
336 if (buf) {
337 dump_mle(mle, buf, PAGE_SIZE - 1);
338 free_page((unsigned long)buf);
339 }
340 }
341
342 #ifdef CONFIG_DEBUG_FS
343
344 static struct dentry *dlm_debugfs_root = NULL;
345
346 #define DLM_DEBUGFS_DIR "o2dlm"
347 #define DLM_DEBUGFS_DLM_STATE "dlm_state"
348 #define DLM_DEBUGFS_LOCKING_STATE "locking_state"
349 #define DLM_DEBUGFS_MLE_STATE "mle_state"
350 #define DLM_DEBUGFS_PURGE_LIST "purge_list"
351
352 /* begin - utils funcs */
353 static void dlm_debug_free(struct kref *kref)
354 {
355 struct dlm_debug_ctxt *dc;
356
357 dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
358
359 kfree(dc);
360 }
361
362 static void dlm_debug_put(struct dlm_debug_ctxt *dc)
363 {
364 if (dc)
365 kref_put(&dc->debug_refcnt, dlm_debug_free);
366 }
367
368 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
369 {
370 kref_get(&dc->debug_refcnt);
371 }
372
373 static int debug_release(struct inode *inode, struct file *file)
374 {
375 free_page((unsigned long)file->private_data);
376 return 0;
377 }
378
379 static ssize_t debug_read(struct file *file, char __user *buf,
380 size_t nbytes, loff_t *ppos)
381 {
382 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
383 i_size_read(file->f_mapping->host));
384 }
385 /* end - util funcs */
386
387 /* begin - purge list funcs */
388 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
389 {
390 struct dlm_lock_resource *res;
391 int out = 0;
392 unsigned long total = 0;
393
394 out += snprintf(buf + out, len - out,
395 "Dumping Purgelist for Domain: %s\n", dlm->name);
396
397 spin_lock(&dlm->spinlock);
398 list_for_each_entry(res, &dlm->purge_list, purge) {
399 ++total;
400 if (len - out < 100)
401 continue;
402 spin_lock(&res->spinlock);
403 out += stringify_lockname(res->lockname.name,
404 res->lockname.len,
405 buf + out, len - out);
406 out += snprintf(buf + out, len - out, "\t%ld\n",
407 (jiffies - res->last_used)/HZ);
408 spin_unlock(&res->spinlock);
409 }
410 spin_unlock(&dlm->spinlock);
411
412 out += snprintf(buf + out, len - out, "Total on list: %ld\n", total);
413
414 return out;
415 }
416
417 static int debug_purgelist_open(struct inode *inode, struct file *file)
418 {
419 struct dlm_ctxt *dlm = inode->i_private;
420 char *buf = NULL;
421
422 buf = (char *) get_zeroed_page(GFP_NOFS);
423 if (!buf)
424 goto bail;
425
426 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
427
428 file->private_data = buf;
429
430 return 0;
431 bail:
432 return -ENOMEM;
433 }
434
435 static const struct file_operations debug_purgelist_fops = {
436 .open = debug_purgelist_open,
437 .release = debug_release,
438 .read = debug_read,
439 .llseek = generic_file_llseek,
440 };
441 /* end - purge list funcs */
442
443 /* begin - debug mle funcs */
444 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
445 {
446 struct dlm_master_list_entry *mle;
447 struct hlist_head *bucket;
448 struct hlist_node *list;
449 int i, out = 0;
450 unsigned long total = 0, longest = 0, bucket_count = 0;
451
452 out += snprintf(buf + out, len - out,
453 "Dumping MLEs for Domain: %s\n", dlm->name);
454
455 spin_lock(&dlm->master_lock);
456 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
457 bucket = dlm_master_hash(dlm, i);
458 hlist_for_each(list, bucket) {
459 mle = hlist_entry(list, struct dlm_master_list_entry,
460 master_hash_node);
461 ++total;
462 ++bucket_count;
463 if (len - out < 200)
464 continue;
465 out += dump_mle(mle, buf + out, len - out);
466 }
467 longest = max(longest, bucket_count);
468 bucket_count = 0;
469 }
470 spin_unlock(&dlm->master_lock);
471
472 out += snprintf(buf + out, len - out,
473 "Total: %ld, Longest: %ld\n", total, longest);
474 return out;
475 }
476
477 static int debug_mle_open(struct inode *inode, struct file *file)
478 {
479 struct dlm_ctxt *dlm = inode->i_private;
480 char *buf = NULL;
481
482 buf = (char *) get_zeroed_page(GFP_NOFS);
483 if (!buf)
484 goto bail;
485
486 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
487
488 file->private_data = buf;
489
490 return 0;
491 bail:
492 return -ENOMEM;
493 }
494
495 static const struct file_operations debug_mle_fops = {
496 .open = debug_mle_open,
497 .release = debug_release,
498 .read = debug_read,
499 .llseek = generic_file_llseek,
500 };
501
502 /* end - debug mle funcs */
503
504 /* begin - debug lockres funcs */
505 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
506 {
507 int out;
508
509 #define DEBUG_LOCK_VERSION 1
510 spin_lock(&lock->spinlock);
511 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
512 "%d,%d,%d,%d\n",
513 DEBUG_LOCK_VERSION,
514 list_type, lock->ml.type, lock->ml.convert_type,
515 lock->ml.node,
516 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
517 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
518 !list_empty(&lock->ast_list),
519 !list_empty(&lock->bast_list),
520 lock->ast_pending, lock->bast_pending,
521 lock->convert_pending, lock->lock_pending,
522 lock->cancel_pending, lock->unlock_pending,
523 atomic_read(&lock->lock_refs.refcount));
524 spin_unlock(&lock->spinlock);
525
526 return out;
527 }
528
529 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
530 {
531 struct dlm_lock *lock;
532 int i;
533 int out = 0;
534
535 out += snprintf(buf + out, len - out, "NAME:");
536 out += stringify_lockname(res->lockname.name, res->lockname.len,
537 buf + out, len - out);
538 out += snprintf(buf + out, len - out, "\n");
539
540 #define DEBUG_LRES_VERSION 1
541 out += snprintf(buf + out, len - out,
542 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
543 DEBUG_LRES_VERSION,
544 res->owner, res->state, res->last_used,
545 !list_empty(&res->purge),
546 !list_empty(&res->dirty),
547 !list_empty(&res->recovering),
548 res->inflight_locks, res->migration_pending,
549 atomic_read(&res->asts_reserved),
550 atomic_read(&res->refs.refcount));
551
552 /* refmap */
553 out += snprintf(buf + out, len - out, "RMAP:");
554 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
555 buf + out, len - out);
556 out += snprintf(buf + out, len - out, "\n");
557
558 /* lvb */
559 out += snprintf(buf + out, len - out, "LVBX:");
560 for (i = 0; i < DLM_LVB_LEN; i++)
561 out += snprintf(buf + out, len - out,
562 "%02x", (unsigned char)res->lvb[i]);
563 out += snprintf(buf + out, len - out, "\n");
564
565 /* granted */
566 list_for_each_entry(lock, &res->granted, list)
567 out += dump_lock(lock, 0, buf + out, len - out);
568
569 /* converting */
570 list_for_each_entry(lock, &res->converting, list)
571 out += dump_lock(lock, 1, buf + out, len - out);
572
573 /* blocked */
574 list_for_each_entry(lock, &res->blocked, list)
575 out += dump_lock(lock, 2, buf + out, len - out);
576
577 out += snprintf(buf + out, len - out, "\n");
578
579 return out;
580 }
581
582 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
583 {
584 struct debug_lockres *dl = m->private;
585 struct dlm_ctxt *dlm = dl->dl_ctxt;
586 struct dlm_lock_resource *oldres = dl->dl_res;
587 struct dlm_lock_resource *res = NULL;
588 struct list_head *track_list;
589
590 spin_lock(&dlm->track_lock);
591 if (oldres)
592 track_list = &oldres->tracking;
593 else {
594 track_list = &dlm->tracking_list;
595 if (list_empty(track_list)) {
596 dl = NULL;
597 spin_unlock(&dlm->track_lock);
598 goto bail;
599 }
600 }
601
602 list_for_each_entry(res, track_list, tracking) {
603 if (&res->tracking == &dlm->tracking_list)
604 res = NULL;
605 else
606 dlm_lockres_get(res);
607 break;
608 }
609 spin_unlock(&dlm->track_lock);
610
611 if (oldres)
612 dlm_lockres_put(oldres);
613
614 dl->dl_res = res;
615
616 if (res) {
617 spin_lock(&res->spinlock);
618 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
619 spin_unlock(&res->spinlock);
620 } else
621 dl = NULL;
622
623 bail:
624 /* passed to seq_show */
625 return dl;
626 }
627
628 static void lockres_seq_stop(struct seq_file *m, void *v)
629 {
630 }
631
632 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
633 {
634 return NULL;
635 }
636
637 static int lockres_seq_show(struct seq_file *s, void *v)
638 {
639 struct debug_lockres *dl = (struct debug_lockres *)v;
640
641 seq_printf(s, "%s", dl->dl_buf);
642
643 return 0;
644 }
645
646 static const struct seq_operations debug_lockres_ops = {
647 .start = lockres_seq_start,
648 .stop = lockres_seq_stop,
649 .next = lockres_seq_next,
650 .show = lockres_seq_show,
651 };
652
653 static int debug_lockres_open(struct inode *inode, struct file *file)
654 {
655 struct dlm_ctxt *dlm = inode->i_private;
656 int ret = -ENOMEM;
657 struct seq_file *seq;
658 struct debug_lockres *dl = NULL;
659
660 dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
661 if (!dl) {
662 mlog_errno(ret);
663 goto bail;
664 }
665
666 dl->dl_len = PAGE_SIZE;
667 dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
668 if (!dl->dl_buf) {
669 mlog_errno(ret);
670 goto bail;
671 }
672
673 ret = seq_open(file, &debug_lockres_ops);
674 if (ret) {
675 mlog_errno(ret);
676 goto bail;
677 }
678
679 seq = file->private_data;
680 seq->private = dl;
681
682 dlm_grab(dlm);
683 dl->dl_ctxt = dlm;
684
685 return 0;
686 bail:
687 if (dl)
688 kfree(dl->dl_buf);
689 kfree(dl);
690 return ret;
691 }
692
693 static int debug_lockres_release(struct inode *inode, struct file *file)
694 {
695 struct seq_file *seq = file->private_data;
696 struct debug_lockres *dl = (struct debug_lockres *)seq->private;
697
698 if (dl->dl_res)
699 dlm_lockres_put(dl->dl_res);
700 dlm_put(dl->dl_ctxt);
701 kfree(dl->dl_buf);
702 return seq_release_private(inode, file);
703 }
704
705 static const struct file_operations debug_lockres_fops = {
706 .open = debug_lockres_open,
707 .release = debug_lockres_release,
708 .read = seq_read,
709 .llseek = seq_lseek,
710 };
711 /* end - debug lockres funcs */
712
713 /* begin - debug state funcs */
714 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
715 {
716 int out = 0;
717 struct dlm_reco_node_data *node;
718 char *state;
719 int cur_mles = 0, tot_mles = 0;
720 int i;
721
722 spin_lock(&dlm->spinlock);
723
724 switch (dlm->dlm_state) {
725 case DLM_CTXT_NEW:
726 state = "NEW"; break;
727 case DLM_CTXT_JOINED:
728 state = "JOINED"; break;
729 case DLM_CTXT_IN_SHUTDOWN:
730 state = "SHUTDOWN"; break;
731 case DLM_CTXT_LEAVING:
732 state = "LEAVING"; break;
733 default:
734 state = "UNKNOWN"; break;
735 }
736
737 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */
738 out += snprintf(buf + out, len - out,
739 "Domain: %s Key: 0x%08x Protocol: %d.%d\n",
740 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
741 dlm->dlm_locking_proto.pv_minor);
742
743 /* Thread Pid: xxx Node: xxx State: xxxxx */
744 out += snprintf(buf + out, len - out,
745 "Thread Pid: %d Node: %d State: %s\n",
746 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
747
748 /* Number of Joins: xxx Joining Node: xxx */
749 out += snprintf(buf + out, len - out,
750 "Number of Joins: %d Joining Node: %d\n",
751 dlm->num_joins, dlm->joining_node);
752
753 /* Domain Map: xx xx xx */
754 out += snprintf(buf + out, len - out, "Domain Map: ");
755 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
756 buf + out, len - out);
757 out += snprintf(buf + out, len - out, "\n");
758
759 /* Exit Domain Map: xx xx xx */
760 out += snprintf(buf + out, len - out, "Exit Domain Map: ");
761 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES,
762 buf + out, len - out);
763 out += snprintf(buf + out, len - out, "\n");
764
765 /* Live Map: xx xx xx */
766 out += snprintf(buf + out, len - out, "Live Map: ");
767 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
768 buf + out, len - out);
769 out += snprintf(buf + out, len - out, "\n");
770
771 /* Lock Resources: xxx (xxx) */
772 out += snprintf(buf + out, len - out,
773 "Lock Resources: %d (%d)\n",
774 atomic_read(&dlm->res_cur_count),
775 atomic_read(&dlm->res_tot_count));
776
777 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
778 tot_mles += atomic_read(&dlm->mle_tot_count[i]);
779
780 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
781 cur_mles += atomic_read(&dlm->mle_cur_count[i]);
782
783 /* MLEs: xxx (xxx) */
784 out += snprintf(buf + out, len - out,
785 "MLEs: %d (%d)\n", cur_mles, tot_mles);
786
787 /* Blocking: xxx (xxx) */
788 out += snprintf(buf + out, len - out,
789 " Blocking: %d (%d)\n",
790 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
791 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
792
793 /* Mastery: xxx (xxx) */
794 out += snprintf(buf + out, len - out,
795 " Mastery: %d (%d)\n",
796 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
797 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
798
799 /* Migration: xxx (xxx) */
800 out += snprintf(buf + out, len - out,
801 " Migration: %d (%d)\n",
802 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
803 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
804
805 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
806 out += snprintf(buf + out, len - out,
807 "Lists: Dirty=%s Purge=%s PendingASTs=%s "
808 "PendingBASTs=%s\n",
809 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
810 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
811 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
812 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
813
814 /* Purge Count: xxx Refs: xxx */
815 out += snprintf(buf + out, len - out,
816 "Purge Count: %d Refs: %d\n", dlm->purge_count,
817 atomic_read(&dlm->dlm_refs.refcount));
818
819 /* Dead Node: xxx */
820 out += snprintf(buf + out, len - out,
821 "Dead Node: %d\n", dlm->reco.dead_node);
822
823 /* What about DLM_RECO_STATE_FINALIZE? */
824 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
825 state = "ACTIVE";
826 else
827 state = "INACTIVE";
828
829 /* Recovery Pid: xxxx Master: xxx State: xxxx */
830 out += snprintf(buf + out, len - out,
831 "Recovery Pid: %d Master: %d State: %s\n",
832 task_pid_nr(dlm->dlm_reco_thread_task),
833 dlm->reco.new_master, state);
834
835 /* Recovery Map: xx xx */
836 out += snprintf(buf + out, len - out, "Recovery Map: ");
837 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
838 buf + out, len - out);
839 out += snprintf(buf + out, len - out, "\n");
840
841 /* Recovery Node State: */
842 out += snprintf(buf + out, len - out, "Recovery Node State:\n");
843 list_for_each_entry(node, &dlm->reco.node_data, list) {
844 switch (node->state) {
845 case DLM_RECO_NODE_DATA_INIT:
846 state = "INIT";
847 break;
848 case DLM_RECO_NODE_DATA_REQUESTING:
849 state = "REQUESTING";
850 break;
851 case DLM_RECO_NODE_DATA_DEAD:
852 state = "DEAD";
853 break;
854 case DLM_RECO_NODE_DATA_RECEIVING:
855 state = "RECEIVING";
856 break;
857 case DLM_RECO_NODE_DATA_REQUESTED:
858 state = "REQUESTED";
859 break;
860 case DLM_RECO_NODE_DATA_DONE:
861 state = "DONE";
862 break;
863 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
864 state = "FINALIZE-SENT";
865 break;
866 default:
867 state = "BAD";
868 break;
869 }
870 out += snprintf(buf + out, len - out, "\t%u - %s\n",
871 node->node_num, state);
872 }
873
874 spin_unlock(&dlm->spinlock);
875
876 return out;
877 }
878
879 static int debug_state_open(struct inode *inode, struct file *file)
880 {
881 struct dlm_ctxt *dlm = inode->i_private;
882 char *buf = NULL;
883
884 buf = (char *) get_zeroed_page(GFP_NOFS);
885 if (!buf)
886 goto bail;
887
888 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
889
890 file->private_data = buf;
891
892 return 0;
893 bail:
894 return -ENOMEM;
895 }
896
897 static const struct file_operations debug_state_fops = {
898 .open = debug_state_open,
899 .release = debug_release,
900 .read = debug_read,
901 .llseek = generic_file_llseek,
902 };
903 /* end - debug state funcs */
904
905 /* files in subroot */
906 int dlm_debug_init(struct dlm_ctxt *dlm)
907 {
908 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
909
910 /* for dumping dlm_ctxt */
911 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
912 S_IFREG|S_IRUSR,
913 dlm->dlm_debugfs_subroot,
914 dlm, &debug_state_fops);
915 if (!dc->debug_state_dentry) {
916 mlog_errno(-ENOMEM);
917 goto bail;
918 }
919
920 /* for dumping lockres */
921 dc->debug_lockres_dentry =
922 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
923 S_IFREG|S_IRUSR,
924 dlm->dlm_debugfs_subroot,
925 dlm, &debug_lockres_fops);
926 if (!dc->debug_lockres_dentry) {
927 mlog_errno(-ENOMEM);
928 goto bail;
929 }
930
931 /* for dumping mles */
932 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
933 S_IFREG|S_IRUSR,
934 dlm->dlm_debugfs_subroot,
935 dlm, &debug_mle_fops);
936 if (!dc->debug_mle_dentry) {
937 mlog_errno(-ENOMEM);
938 goto bail;
939 }
940
941 /* for dumping lockres on the purge list */
942 dc->debug_purgelist_dentry =
943 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
944 S_IFREG|S_IRUSR,
945 dlm->dlm_debugfs_subroot,
946 dlm, &debug_purgelist_fops);
947 if (!dc->debug_purgelist_dentry) {
948 mlog_errno(-ENOMEM);
949 goto bail;
950 }
951
952 dlm_debug_get(dc);
953 return 0;
954
955 bail:
956 dlm_debug_shutdown(dlm);
957 return -ENOMEM;
958 }
959
960 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
961 {
962 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
963
964 if (dc) {
965 debugfs_remove(dc->debug_purgelist_dentry);
966 debugfs_remove(dc->debug_mle_dentry);
967 debugfs_remove(dc->debug_lockres_dentry);
968 debugfs_remove(dc->debug_state_dentry);
969 dlm_debug_put(dc);
970 }
971 }
972
973 /* subroot - domain dir */
974 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
975 {
976 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
977 dlm_debugfs_root);
978 if (!dlm->dlm_debugfs_subroot) {
979 mlog_errno(-ENOMEM);
980 goto bail;
981 }
982
983 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
984 GFP_KERNEL);
985 if (!dlm->dlm_debug_ctxt) {
986 mlog_errno(-ENOMEM);
987 goto bail;
988 }
989 kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
990
991 return 0;
992 bail:
993 dlm_destroy_debugfs_subroot(dlm);
994 return -ENOMEM;
995 }
996
997 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
998 {
999 debugfs_remove(dlm->dlm_debugfs_subroot);
1000 }
1001
1002 /* debugfs root */
1003 int dlm_create_debugfs_root(void)
1004 {
1005 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
1006 if (!dlm_debugfs_root) {
1007 mlog_errno(-ENOMEM);
1008 return -ENOMEM;
1009 }
1010 return 0;
1011 }
1012
1013 void dlm_destroy_debugfs_root(void)
1014 {
1015 debugfs_remove(dlm_debugfs_root);
1016 }
1017 #endif /* CONFIG_DEBUG_FS */
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