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On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / fs / ocfs2 / dlm / dlmdebug.c
blob42b0bad7a612459c8f3e6857cbf829cab964bd57
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) - 1);
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 struct debug_buffer *debug_buffer_allocate(void)
374 {
375 struct debug_buffer *db = NULL;
376
377 db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
378 if (!db)
379 goto bail;
380
381 db->len = PAGE_SIZE;
382 db->buf = kmalloc(db->len, GFP_KERNEL);
383 if (!db->buf)
384 goto bail;
385
386 return db;
387 bail:
388 kfree(db);
389 return NULL;
390 }
391
392 static ssize_t debug_buffer_read(struct file *file, char __user *buf,
393 size_t nbytes, loff_t *ppos)
394 {
395 struct debug_buffer *db = file->private_data;
396
397 return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
398 }
399
400 static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
401 {
402 struct debug_buffer *db = file->private_data;
403 loff_t new = -1;
404
405 switch (whence) {
406 case 0:
407 new = off;
408 break;
409 case 1:
410 new = file->f_pos + off;
411 break;
412 }
413
414 if (new < 0 || new > db->len)
415 return -EINVAL;
416
417 return (file->f_pos = new);
418 }
419
420 static int debug_buffer_release(struct inode *inode, struct file *file)
421 {
422 struct debug_buffer *db = (struct debug_buffer *)file->private_data;
423
424 if (db)
425 kfree(db->buf);
426 kfree(db);
427
428 return 0;
429 }
430 /* end - util funcs */
431
432 /* begin - purge list funcs */
433 static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
434 {
435 struct dlm_lock_resource *res;
436 int out = 0;
437 unsigned long total = 0;
438
439 out += snprintf(db->buf + out, db->len - out,
440 "Dumping Purgelist for Domain: %s\n", dlm->name);
441
442 spin_lock(&dlm->spinlock);
443 list_for_each_entry(res, &dlm->purge_list, purge) {
444 ++total;
445 if (db->len - out < 100)
446 continue;
447 spin_lock(&res->spinlock);
448 out += stringify_lockname(res->lockname.name,
449 res->lockname.len,
450 db->buf + out, db->len - out);
451 out += snprintf(db->buf + out, db->len - out, "\t%ld\n",
452 (jiffies - res->last_used)/HZ);
453 spin_unlock(&res->spinlock);
454 }
455 spin_unlock(&dlm->spinlock);
456
457 out += snprintf(db->buf + out, db->len - out,
458 "Total on list: %ld\n", total);
459
460 return out;
461 }
462
463 static int debug_purgelist_open(struct inode *inode, struct file *file)
464 {
465 struct dlm_ctxt *dlm = inode->i_private;
466 struct debug_buffer *db;
467
468 db = debug_buffer_allocate();
469 if (!db)
470 goto bail;
471
472 db->len = debug_purgelist_print(dlm, db);
473
474 file->private_data = db;
475
476 return 0;
477 bail:
478 return -ENOMEM;
479 }
480
481 static const struct file_operations debug_purgelist_fops = {
482 .open = debug_purgelist_open,
483 .release = debug_buffer_release,
484 .read = debug_buffer_read,
485 .llseek = debug_buffer_llseek,
486 };
487 /* end - purge list funcs */
488
489 /* begin - debug mle funcs */
490 static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
491 {
492 struct dlm_master_list_entry *mle;
493 struct hlist_head *bucket;
494 struct hlist_node *list;
495 int i, out = 0;
496 unsigned long total = 0, longest = 0, bktcnt;
497
498 out += snprintf(db->buf + out, db->len - out,
499 "Dumping MLEs for Domain: %s\n", dlm->name);
500
501 spin_lock(&dlm->master_lock);
502 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
503 bucket = dlm_master_hash(dlm, i);
504 hlist_for_each(list, bucket) {
505 mle = hlist_entry(list, struct dlm_master_list_entry,
506 master_hash_node);
507 ++total;
508 ++bktcnt;
509 if (db->len - out < 200)
510 continue;
511 out += dump_mle(mle, db->buf + out, db->len - out);
512 }
513 longest = max(longest, bktcnt);
514 bktcnt = 0;
515 }
516 spin_unlock(&dlm->master_lock);
517
518 out += snprintf(db->buf + out, db->len - out,
519 "Total: %ld, Longest: %ld\n", total, longest);
520 return out;
521 }
522
523 static int debug_mle_open(struct inode *inode, struct file *file)
524 {
525 struct dlm_ctxt *dlm = inode->i_private;
526 struct debug_buffer *db;
527
528 db = debug_buffer_allocate();
529 if (!db)
530 goto bail;
531
532 db->len = debug_mle_print(dlm, db);
533
534 file->private_data = db;
535
536 return 0;
537 bail:
538 return -ENOMEM;
539 }
540
541 static const struct file_operations debug_mle_fops = {
542 .open = debug_mle_open,
543 .release = debug_buffer_release,
544 .read = debug_buffer_read,
545 .llseek = debug_buffer_llseek,
546 };
547
548 /* end - debug mle funcs */
549
550 /* begin - debug lockres funcs */
551 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
552 {
553 int out;
554
555 #define DEBUG_LOCK_VERSION 1
556 spin_lock(&lock->spinlock);
557 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
558 "%d,%d,%d,%d\n",
559 DEBUG_LOCK_VERSION,
560 list_type, lock->ml.type, lock->ml.convert_type,
561 lock->ml.node,
562 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
563 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
564 !list_empty(&lock->ast_list),
565 !list_empty(&lock->bast_list),
566 lock->ast_pending, lock->bast_pending,
567 lock->convert_pending, lock->lock_pending,
568 lock->cancel_pending, lock->unlock_pending,
569 atomic_read(&lock->lock_refs.refcount));
570 spin_unlock(&lock->spinlock);
571
572 return out;
573 }
574
575 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
576 {
577 struct dlm_lock *lock;
578 int i;
579 int out = 0;
580
581 out += snprintf(buf + out, len - out, "NAME:");
582 out += stringify_lockname(res->lockname.name, res->lockname.len,
583 buf + out, len - out);
584 out += snprintf(buf + out, len - out, "\n");
585
586 #define DEBUG_LRES_VERSION 1
587 out += snprintf(buf + out, len - out,
588 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
589 DEBUG_LRES_VERSION,
590 res->owner, res->state, res->last_used,
591 !list_empty(&res->purge),
592 !list_empty(&res->dirty),
593 !list_empty(&res->recovering),
594 res->inflight_locks, res->migration_pending,
595 atomic_read(&res->asts_reserved),
596 atomic_read(&res->refs.refcount));
597
598 /* refmap */
599 out += snprintf(buf + out, len - out, "RMAP:");
600 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
601 buf + out, len - out);
602 out += snprintf(buf + out, len - out, "\n");
603
604 /* lvb */
605 out += snprintf(buf + out, len - out, "LVBX:");
606 for (i = 0; i < DLM_LVB_LEN; i++)
607 out += snprintf(buf + out, len - out,
608 "%02x", (unsigned char)res->lvb[i]);
609 out += snprintf(buf + out, len - out, "\n");
610
611 /* granted */
612 list_for_each_entry(lock, &res->granted, list)
613 out += dump_lock(lock, 0, buf + out, len - out);
614
615 /* converting */
616 list_for_each_entry(lock, &res->converting, list)
617 out += dump_lock(lock, 1, buf + out, len - out);
618
619 /* blocked */
620 list_for_each_entry(lock, &res->blocked, list)
621 out += dump_lock(lock, 2, buf + out, len - out);
622
623 out += snprintf(buf + out, len - out, "\n");
624
625 return out;
626 }
627
628 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
629 {
630 struct debug_lockres *dl = m->private;
631 struct dlm_ctxt *dlm = dl->dl_ctxt;
632 struct dlm_lock_resource *oldres = dl->dl_res;
633 struct dlm_lock_resource *res = NULL;
634 struct list_head *track_list;
635
636 spin_lock(&dlm->track_lock);
637 if (oldres)
638 track_list = &oldres->tracking;
639 else
640 track_list = &dlm->tracking_list;
641
642 list_for_each_entry(res, track_list, tracking) {
643 if (&res->tracking == &dlm->tracking_list)
644 res = NULL;
645 else
646 dlm_lockres_get(res);
647 break;
648 }
649 spin_unlock(&dlm->track_lock);
650
651 if (oldres)
652 dlm_lockres_put(oldres);
653
654 dl->dl_res = res;
655
656 if (res) {
657 spin_lock(&res->spinlock);
658 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
659 spin_unlock(&res->spinlock);
660 } else
661 dl = NULL;
662
663 /* passed to seq_show */
664 return dl;
665 }
666
667 static void lockres_seq_stop(struct seq_file *m, void *v)
668 {
669 }
670
671 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
672 {
673 return NULL;
674 }
675
676 static int lockres_seq_show(struct seq_file *s, void *v)
677 {
678 struct debug_lockres *dl = (struct debug_lockres *)v;
679
680 seq_printf(s, "%s", dl->dl_buf);
681
682 return 0;
683 }
684
685 static const struct seq_operations debug_lockres_ops = {
686 .start = lockres_seq_start,
687 .stop = lockres_seq_stop,
688 .next = lockres_seq_next,
689 .show = lockres_seq_show,
690 };
691
692 static int debug_lockres_open(struct inode *inode, struct file *file)
693 {
694 struct dlm_ctxt *dlm = inode->i_private;
695 int ret = -ENOMEM;
696 struct seq_file *seq;
697 struct debug_lockres *dl = NULL;
698
699 dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
700 if (!dl) {
701 mlog_errno(ret);
702 goto bail;
703 }
704
705 dl->dl_len = PAGE_SIZE;
706 dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
707 if (!dl->dl_buf) {
708 mlog_errno(ret);
709 goto bail;
710 }
711
712 ret = seq_open(file, &debug_lockres_ops);
713 if (ret) {
714 mlog_errno(ret);
715 goto bail;
716 }
717
718 seq = (struct seq_file *) file->private_data;
719 seq->private = dl;
720
721 dlm_grab(dlm);
722 dl->dl_ctxt = dlm;
723
724 return 0;
725 bail:
726 if (dl)
727 kfree(dl->dl_buf);
728 kfree(dl);
729 return ret;
730 }
731
732 static int debug_lockres_release(struct inode *inode, struct file *file)
733 {
734 struct seq_file *seq = (struct seq_file *)file->private_data;
735 struct debug_lockres *dl = (struct debug_lockres *)seq->private;
736
737 if (dl->dl_res)
738 dlm_lockres_put(dl->dl_res);
739 dlm_put(dl->dl_ctxt);
740 kfree(dl->dl_buf);
741 return seq_release_private(inode, file);
742 }
743
744 static const struct file_operations debug_lockres_fops = {
745 .open = debug_lockres_open,
746 .release = debug_lockres_release,
747 .read = seq_read,
748 .llseek = seq_lseek,
749 };
750 /* end - debug lockres funcs */
751
752 /* begin - debug state funcs */
753 static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
754 {
755 int out = 0;
756 struct dlm_reco_node_data *node;
757 char *state;
758 int cur_mles = 0, tot_mles = 0;
759 int i;
760
761 spin_lock(&dlm->spinlock);
762
763 switch (dlm->dlm_state) {
764 case DLM_CTXT_NEW:
765 state = "NEW"; break;
766 case DLM_CTXT_JOINED:
767 state = "JOINED"; break;
768 case DLM_CTXT_IN_SHUTDOWN:
769 state = "SHUTDOWN"; break;
770 case DLM_CTXT_LEAVING:
771 state = "LEAVING"; break;
772 default:
773 state = "UNKNOWN"; break;
774 }
775
776 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */
777 out += snprintf(db->buf + out, db->len - out,
778 "Domain: %s Key: 0x%08x\n", dlm->name, dlm->key);
779
780 /* Thread Pid: xxx Node: xxx State: xxxxx */
781 out += snprintf(db->buf + out, db->len - out,
782 "Thread Pid: %d Node: %d State: %s\n",
783 dlm->dlm_thread_task->pid, dlm->node_num, state);
784
785 /* Number of Joins: xxx Joining Node: xxx */
786 out += snprintf(db->buf + out, db->len - out,
787 "Number of Joins: %d Joining Node: %d\n",
788 dlm->num_joins, dlm->joining_node);
789
790 /* Domain Map: xx xx xx */
791 out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
792 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
793 db->buf + out, db->len - out);
794 out += snprintf(db->buf + out, db->len - out, "\n");
795
796 /* Live Map: xx xx xx */
797 out += snprintf(db->buf + out, db->len - out, "Live Map: ");
798 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
799 db->buf + out, db->len - out);
800 out += snprintf(db->buf + out, db->len - out, "\n");
801
802 /* Lock Resources: xxx (xxx) */
803 out += snprintf(db->buf + out, db->len - out,
804 "Lock Resources: %d (%d)\n",
805 atomic_read(&dlm->res_cur_count),
806 atomic_read(&dlm->res_tot_count));
807
808 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
809 tot_mles += atomic_read(&dlm->mle_tot_count[i]);
810
811 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
812 cur_mles += atomic_read(&dlm->mle_cur_count[i]);
813
814 /* MLEs: xxx (xxx) */
815 out += snprintf(db->buf + out, db->len - out,
816 "MLEs: %d (%d)\n", cur_mles, tot_mles);
817
818 /* Blocking: xxx (xxx) */
819 out += snprintf(db->buf + out, db->len - out,
820 " Blocking: %d (%d)\n",
821 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
822 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
823
824 /* Mastery: xxx (xxx) */
825 out += snprintf(db->buf + out, db->len - out,
826 " Mastery: %d (%d)\n",
827 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
828 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
829
830 /* Migration: xxx (xxx) */
831 out += snprintf(db->buf + out, db->len - out,
832 " Migration: %d (%d)\n",
833 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
834 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
835
836 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
837 out += snprintf(db->buf + out, db->len - out,
838 "Lists: Dirty=%s Purge=%s PendingASTs=%s "
839 "PendingBASTs=%s\n",
840 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
841 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
842 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
843 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
844
845 /* Purge Count: xxx Refs: xxx */
846 out += snprintf(db->buf + out, db->len - out,
847 "Purge Count: %d Refs: %d\n", dlm->purge_count,
848 atomic_read(&dlm->dlm_refs.refcount));
849
850 /* Dead Node: xxx */
851 out += snprintf(db->buf + out, db->len - out,
852 "Dead Node: %d\n", dlm->reco.dead_node);
853
854 /* What about DLM_RECO_STATE_FINALIZE? */
855 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
856 state = "ACTIVE";
857 else
858 state = "INACTIVE";
859
860 /* Recovery Pid: xxxx Master: xxx State: xxxx */
861 out += snprintf(db->buf + out, db->len - out,
862 "Recovery Pid: %d Master: %d State: %s\n",
863 dlm->dlm_reco_thread_task->pid,
864 dlm->reco.new_master, state);
865
866 /* Recovery Map: xx xx */
867 out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
868 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
869 db->buf + out, db->len - out);
870 out += snprintf(db->buf + out, db->len - out, "\n");
871
872 /* Recovery Node State: */
873 out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
874 list_for_each_entry(node, &dlm->reco.node_data, list) {
875 switch (node->state) {
876 case DLM_RECO_NODE_DATA_INIT:
877 state = "INIT";
878 break;
879 case DLM_RECO_NODE_DATA_REQUESTING:
880 state = "REQUESTING";
881 break;
882 case DLM_RECO_NODE_DATA_DEAD:
883 state = "DEAD";
884 break;
885 case DLM_RECO_NODE_DATA_RECEIVING:
886 state = "RECEIVING";
887 break;
888 case DLM_RECO_NODE_DATA_REQUESTED:
889 state = "REQUESTED";
890 break;
891 case DLM_RECO_NODE_DATA_DONE:
892 state = "DONE";
893 break;
894 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
895 state = "FINALIZE-SENT";
896 break;
897 default:
898 state = "BAD";
899 break;
900 }
901 out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
902 node->node_num, state);
903 }
904
905 spin_unlock(&dlm->spinlock);
906
907 return out;
908 }
909
910 static int debug_state_open(struct inode *inode, struct file *file)
911 {
912 struct dlm_ctxt *dlm = inode->i_private;
913 struct debug_buffer *db = NULL;
914
915 db = debug_buffer_allocate();
916 if (!db)
917 goto bail;
918
919 db->len = debug_state_print(dlm, db);
920
921 file->private_data = db;
922
923 return 0;
924 bail:
925 return -ENOMEM;
926 }
927
928 static const struct file_operations debug_state_fops = {
929 .open = debug_state_open,
930 .release = debug_buffer_release,
931 .read = debug_buffer_read,
932 .llseek = debug_buffer_llseek,
933 };
934 /* end - debug state funcs */
935
936 /* files in subroot */
937 int dlm_debug_init(struct dlm_ctxt *dlm)
938 {
939 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
940
941 /* for dumping dlm_ctxt */
942 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
943 S_IFREG|S_IRUSR,
944 dlm->dlm_debugfs_subroot,
945 dlm, &debug_state_fops);
946 if (!dc->debug_state_dentry) {
947 mlog_errno(-ENOMEM);
948 goto bail;
949 }
950
951 /* for dumping lockres */
952 dc->debug_lockres_dentry =
953 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
954 S_IFREG|S_IRUSR,
955 dlm->dlm_debugfs_subroot,
956 dlm, &debug_lockres_fops);
957 if (!dc->debug_lockres_dentry) {
958 mlog_errno(-ENOMEM);
959 goto bail;
960 }
961
962 /* for dumping mles */
963 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
964 S_IFREG|S_IRUSR,
965 dlm->dlm_debugfs_subroot,
966 dlm, &debug_mle_fops);
967 if (!dc->debug_mle_dentry) {
968 mlog_errno(-ENOMEM);
969 goto bail;
970 }
971
972 /* for dumping lockres on the purge list */
973 dc->debug_purgelist_dentry =
974 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
975 S_IFREG|S_IRUSR,
976 dlm->dlm_debugfs_subroot,
977 dlm, &debug_purgelist_fops);
978 if (!dc->debug_purgelist_dentry) {
979 mlog_errno(-ENOMEM);
980 goto bail;
981 }
982
983 dlm_debug_get(dc);
984 return 0;
985
986 bail:
987 dlm_debug_shutdown(dlm);
988 return -ENOMEM;
989 }
990
991 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
992 {
993 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
994
995 if (dc) {
996 if (dc->debug_purgelist_dentry)
997 debugfs_remove(dc->debug_purgelist_dentry);
998 if (dc->debug_mle_dentry)
999 debugfs_remove(dc->debug_mle_dentry);
1000 if (dc->debug_lockres_dentry)
1001 debugfs_remove(dc->debug_lockres_dentry);
1002 if (dc->debug_state_dentry)
1003 debugfs_remove(dc->debug_state_dentry);
1004 dlm_debug_put(dc);
1005 }
1006 }
1007
1008 /* subroot - domain dir */
1009 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
1010 {
1011 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
1012 dlm_debugfs_root);
1013 if (!dlm->dlm_debugfs_subroot) {
1014 mlog_errno(-ENOMEM);
1015 goto bail;
1016 }
1017
1018 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
1019 GFP_KERNEL);
1020 if (!dlm->dlm_debug_ctxt) {
1021 mlog_errno(-ENOMEM);
1022 goto bail;
1023 }
1024 kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
1025
1026 return 0;
1027 bail:
1028 dlm_destroy_debugfs_subroot(dlm);
1029 return -ENOMEM;
1030 }
1031
1032 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
1033 {
1034 if (dlm->dlm_debugfs_subroot)
1035 debugfs_remove(dlm->dlm_debugfs_subroot);
1036 }
1037
1038 /* debugfs root */
1039 int dlm_create_debugfs_root(void)
1040 {
1041 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
1042 if (!dlm_debugfs_root) {
1043 mlog_errno(-ENOMEM);
1044 return -ENOMEM;
1045 }
1046 return 0;
1047 }
1048
1049 void dlm_destroy_debugfs_root(void)
1050 {
1051 if (dlm_debugfs_root)
1052 debugfs_remove(dlm_debugfs_root);
1053 }
1054 #endif /* CONFIG_DEBUG_FS */
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