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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / fs / ocfs2 / dlm / dlmdebug.c
blob0e28e242226d8f69dfc638b8426c7700b8b1ba18
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 #include <linux/export.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 static int stringify_lockname(const char *lockname, int locklen, char *buf,
48 int len);
49
50 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
51 {
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 printk(" 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 static void __dlm_print_lock(struct dlm_lock *lock)
75 {
76 spin_lock(&lock->spinlock);
77
78 printk(" type=%d, conv=%d, node=%u, cookie=%u:%llu, "
79 "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), "
80 "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n",
81 lock->ml.type, lock->ml.convert_type, lock->ml.node,
82 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
83 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
84 atomic_read(&lock->lock_refs.refcount),
85 (list_empty(&lock->ast_list) ? 'y' : 'n'),
86 (lock->ast_pending ? 'y' : 'n'),
87 (list_empty(&lock->bast_list) ? 'y' : 'n'),
88 (lock->bast_pending ? 'y' : 'n'),
89 (lock->convert_pending ? 'y' : 'n'),
90 (lock->lock_pending ? 'y' : 'n'),
91 (lock->cancel_pending ? 'y' : 'n'),
92 (lock->unlock_pending ? 'y' : 'n'));
93
94 spin_unlock(&lock->spinlock);
95 }
96
97 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
98 {
99 struct list_head *iter2;
100 struct dlm_lock *lock;
101 char buf[DLM_LOCKID_NAME_MAX];
102
103 assert_spin_locked(&res->spinlock);
104
105 stringify_lockname(res->lockname.name, res->lockname.len,
106 buf, sizeof(buf));
107 printk("lockres: %s, owner=%u, state=%u\n",
108 buf, res->owner, res->state);
109 printk(" last used: %lu, refcnt: %u, on purge list: %s\n",
110 res->last_used, atomic_read(&res->refs.refcount),
111 list_empty(&res->purge) ? "no" : "yes");
112 printk(" on dirty list: %s, on reco list: %s, "
113 "migrating pending: %s\n",
114 list_empty(&res->dirty) ? "no" : "yes",
115 list_empty(&res->recovering) ? "no" : "yes",
116 res->migration_pending ? "yes" : "no");
117 printk(" inflight locks: %d, asts reserved: %d\n",
118 res->inflight_locks, atomic_read(&res->asts_reserved));
119 dlm_print_lockres_refmap(res);
120 printk(" granted queue:\n");
121 list_for_each(iter2, &res->granted) {
122 lock = list_entry(iter2, struct dlm_lock, list);
123 __dlm_print_lock(lock);
124 }
125 printk(" converting queue:\n");
126 list_for_each(iter2, &res->converting) {
127 lock = list_entry(iter2, struct dlm_lock, list);
128 __dlm_print_lock(lock);
129 }
130 printk(" blocked queue:\n");
131 list_for_each(iter2, &res->blocked) {
132 lock = list_entry(iter2, struct dlm_lock, list);
133 __dlm_print_lock(lock);
134 }
135 }
136
137 void dlm_print_one_lock(struct dlm_lock *lockid)
138 {
139 dlm_print_one_lock_resource(lockid->lockres);
140 }
141 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
142
143 static const char *dlm_errnames[] = {
144 [DLM_NORMAL] = "DLM_NORMAL",
145 [DLM_GRANTED] = "DLM_GRANTED",
146 [DLM_DENIED] = "DLM_DENIED",
147 [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS",
148 [DLM_WORKING] = "DLM_WORKING",
149 [DLM_BLOCKED] = "DLM_BLOCKED",
150 [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN",
151 [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD",
152 [DLM_SYSERR] = "DLM_SYSERR",
153 [DLM_NOSUPPORT] = "DLM_NOSUPPORT",
154 [DLM_CANCELGRANT] = "DLM_CANCELGRANT",
155 [DLM_IVLOCKID] = "DLM_IVLOCKID",
156 [DLM_SYNC] = "DLM_SYNC",
157 [DLM_BADTYPE] = "DLM_BADTYPE",
158 [DLM_BADRESOURCE] = "DLM_BADRESOURCE",
159 [DLM_MAXHANDLES] = "DLM_MAXHANDLES",
160 [DLM_NOCLINFO] = "DLM_NOCLINFO",
161 [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR",
162 [DLM_NOPURGED] = "DLM_NOPURGED",
163 [DLM_BADARGS] = "DLM_BADARGS",
164 [DLM_VOID] = "DLM_VOID",
165 [DLM_NOTQUEUED] = "DLM_NOTQUEUED",
166 [DLM_IVBUFLEN] = "DLM_IVBUFLEN",
167 [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT",
168 [DLM_BADPARAM] = "DLM_BADPARAM",
169 [DLM_VALNOTVALID] = "DLM_VALNOTVALID",
170 [DLM_REJECTED] = "DLM_REJECTED",
171 [DLM_ABORT] = "DLM_ABORT",
172 [DLM_CANCEL] = "DLM_CANCEL",
173 [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE",
174 [DLM_DEADLOCK] = "DLM_DEADLOCK",
175 [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS",
176 [DLM_FORWARD] = "DLM_FORWARD",
177 [DLM_TIMEOUT] = "DLM_TIMEOUT",
178 [DLM_IVGROUPID] = "DLM_IVGROUPID",
179 [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT",
180 [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH",
181 [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION",
182 [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ",
183 [DLM_RECOVERING] = "DLM_RECOVERING",
184 [DLM_MIGRATING] = "DLM_MIGRATING",
185 [DLM_MAXSTATS] = "DLM_MAXSTATS",
186 };
187
188 static const char *dlm_errmsgs[] = {
189 [DLM_NORMAL] = "request in progress",
190 [DLM_GRANTED] = "request granted",
191 [DLM_DENIED] = "request denied",
192 [DLM_DENIED_NOLOCKS] = "request denied, out of system resources",
193 [DLM_WORKING] = "async request in progress",
194 [DLM_BLOCKED] = "lock request blocked",
195 [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock",
196 [DLM_DENIED_GRACE_PERIOD] = "topological change in progress",
197 [DLM_SYSERR] = "system error",
198 [DLM_NOSUPPORT] = "unsupported",
199 [DLM_CANCELGRANT] = "can't cancel convert: already granted",
200 [DLM_IVLOCKID] = "bad lockid",
201 [DLM_SYNC] = "synchronous request granted",
202 [DLM_BADTYPE] = "bad resource type",
203 [DLM_BADRESOURCE] = "bad resource handle",
204 [DLM_MAXHANDLES] = "no more resource handles",
205 [DLM_NOCLINFO] = "can't contact cluster manager",
206 [DLM_NOLOCKMGR] = "can't contact lock manager",
207 [DLM_NOPURGED] = "can't contact purge daemon",
208 [DLM_BADARGS] = "bad api args",
209 [DLM_VOID] = "no status",
210 [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed",
211 [DLM_IVBUFLEN] = "invalid resource name length",
212 [DLM_CVTUNGRANT] = "attempted to convert ungranted lock",
213 [DLM_BADPARAM] = "invalid lock mode specified",
214 [DLM_VALNOTVALID] = "value block has been invalidated",
215 [DLM_REJECTED] = "request rejected, unrecognized client",
216 [DLM_ABORT] = "blocked lock request cancelled",
217 [DLM_CANCEL] = "conversion request cancelled",
218 [DLM_IVRESHANDLE] = "invalid resource handle",
219 [DLM_DEADLOCK] = "deadlock recovery refused this request",
220 [DLM_DENIED_NOASTS] = "failed to allocate AST",
221 [DLM_FORWARD] = "request must wait for primary's response",
222 [DLM_TIMEOUT] = "timeout value for lock has expired",
223 [DLM_IVGROUPID] = "invalid group specification",
224 [DLM_VERS_CONFLICT] = "version conflicts prevent request handling",
225 [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong",
226 [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device",
227 [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ",
228 [DLM_RECOVERING] = "lock resource being recovered",
229 [DLM_MIGRATING] = "lock resource being migrated",
230 [DLM_MAXSTATS] = "invalid error number",
231 };
232
233 const char *dlm_errmsg(enum dlm_status err)
234 {
235 if (err >= DLM_MAXSTATS || err < 0)
236 return dlm_errmsgs[DLM_MAXSTATS];
237 return dlm_errmsgs[err];
238 }
239 EXPORT_SYMBOL_GPL(dlm_errmsg);
240
241 const char *dlm_errname(enum dlm_status err)
242 {
243 if (err >= DLM_MAXSTATS || err < 0)
244 return dlm_errnames[DLM_MAXSTATS];
245 return dlm_errnames[err];
246 }
247 EXPORT_SYMBOL_GPL(dlm_errname);
248
249 /* NOTE: This function converts a lockname into a string. It uses knowledge
250 * of the format of the lockname that should be outside the purview of the dlm.
251 * We are adding only to make dlm debugging slightly easier.
252 *
253 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
254 */
255 static int stringify_lockname(const char *lockname, int locklen, char *buf,
256 int len)
257 {
258 int out = 0;
259 __be64 inode_blkno_be;
260
261 #define OCFS2_DENTRY_LOCK_INO_START 18
262 if (*lockname == 'N') {
263 memcpy((__be64 *)&inode_blkno_be,
264 (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
265 sizeof(__be64));
266 out += snprintf(buf + out, len - out, "%.*s%08x",
267 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
268 (unsigned int)be64_to_cpu(inode_blkno_be));
269 } else
270 out += snprintf(buf + out, len - out, "%.*s",
271 locklen, lockname);
272 return out;
273 }
274
275 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
276 char *buf, int len)
277 {
278 int out = 0;
279 int i = -1;
280
281 while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
282 out += snprintf(buf + out, len - out, "%d ", i);
283
284 return out;
285 }
286
287 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
288 {
289 int out = 0;
290 char *mle_type;
291
292 if (mle->type == DLM_MLE_BLOCK)
293 mle_type = "BLK";
294 else if (mle->type == DLM_MLE_MASTER)
295 mle_type = "MAS";
296 else
297 mle_type = "MIG";
298
299 out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
300 out += snprintf(buf + out, len - out,
301 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
302 mle_type, mle->master, mle->new_master,
303 !list_empty(&mle->hb_events),
304 !!mle->inuse,
305 atomic_read(&mle->mle_refs.refcount));
306
307 out += snprintf(buf + out, len - out, "Maybe=");
308 out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
309 buf + out, len - out);
310 out += snprintf(buf + out, len - out, "\n");
311
312 out += snprintf(buf + out, len - out, "Vote=");
313 out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
314 buf + out, len - out);
315 out += snprintf(buf + out, len - out, "\n");
316
317 out += snprintf(buf + out, len - out, "Response=");
318 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
319 buf + out, len - out);
320 out += snprintf(buf + out, len - out, "\n");
321
322 out += snprintf(buf + out, len - out, "Node=");
323 out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
324 buf + out, len - out);
325 out += snprintf(buf + out, len - out, "\n");
326
327 out += snprintf(buf + out, len - out, "\n");
328
329 return out;
330 }
331
332 void dlm_print_one_mle(struct dlm_master_list_entry *mle)
333 {
334 char *buf;
335
336 buf = (char *) get_zeroed_page(GFP_NOFS);
337 if (buf) {
338 dump_mle(mle, buf, PAGE_SIZE - 1);
339 free_page((unsigned long)buf);
340 }
341 }
342
343 #ifdef CONFIG_DEBUG_FS
344
345 static struct dentry *dlm_debugfs_root = NULL;
346
347 #define DLM_DEBUGFS_DIR "o2dlm"
348 #define DLM_DEBUGFS_DLM_STATE "dlm_state"
349 #define DLM_DEBUGFS_LOCKING_STATE "locking_state"
350 #define DLM_DEBUGFS_MLE_STATE "mle_state"
351 #define DLM_DEBUGFS_PURGE_LIST "purge_list"
352
353 /* begin - utils funcs */
354 static void dlm_debug_free(struct kref *kref)
355 {
356 struct dlm_debug_ctxt *dc;
357
358 dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
359
360 kfree(dc);
361 }
362
363 static void dlm_debug_put(struct dlm_debug_ctxt *dc)
364 {
365 if (dc)
366 kref_put(&dc->debug_refcnt, dlm_debug_free);
367 }
368
369 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
370 {
371 kref_get(&dc->debug_refcnt);
372 }
373
374 static int debug_release(struct inode *inode, struct file *file)
375 {
376 free_page((unsigned long)file->private_data);
377 return 0;
378 }
379
380 static ssize_t debug_read(struct file *file, char __user *buf,
381 size_t nbytes, loff_t *ppos)
382 {
383 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
384 i_size_read(file->f_mapping->host));
385 }
386 /* end - util funcs */
387
388 /* begin - purge list funcs */
389 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
390 {
391 struct dlm_lock_resource *res;
392 int out = 0;
393 unsigned long total = 0;
394
395 out += snprintf(buf + out, len - out,
396 "Dumping Purgelist for Domain: %s\n", dlm->name);
397
398 spin_lock(&dlm->spinlock);
399 list_for_each_entry(res, &dlm->purge_list, purge) {
400 ++total;
401 if (len - out < 100)
402 continue;
403 spin_lock(&res->spinlock);
404 out += stringify_lockname(res->lockname.name,
405 res->lockname.len,
406 buf + out, len - out);
407 out += snprintf(buf + out, len - out, "\t%ld\n",
408 (jiffies - res->last_used)/HZ);
409 spin_unlock(&res->spinlock);
410 }
411 spin_unlock(&dlm->spinlock);
412
413 out += snprintf(buf + out, len - out, "Total on list: %ld\n", total);
414
415 return out;
416 }
417
418 static int debug_purgelist_open(struct inode *inode, struct file *file)
419 {
420 struct dlm_ctxt *dlm = inode->i_private;
421 char *buf = NULL;
422
423 buf = (char *) get_zeroed_page(GFP_NOFS);
424 if (!buf)
425 goto bail;
426
427 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
428
429 file->private_data = buf;
430
431 return 0;
432 bail:
433 return -ENOMEM;
434 }
435
436 static const struct file_operations debug_purgelist_fops = {
437 .open = debug_purgelist_open,
438 .release = debug_release,
439 .read = debug_read,
440 .llseek = generic_file_llseek,
441 };
442 /* end - purge list funcs */
443
444 /* begin - debug mle funcs */
445 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
446 {
447 struct dlm_master_list_entry *mle;
448 struct hlist_head *bucket;
449 struct hlist_node *list;
450 int i, out = 0;
451 unsigned long total = 0, longest = 0, bucket_count = 0;
452
453 out += snprintf(buf + out, len - out,
454 "Dumping MLEs for Domain: %s\n", dlm->name);
455
456 spin_lock(&dlm->master_lock);
457 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
458 bucket = dlm_master_hash(dlm, i);
459 hlist_for_each(list, bucket) {
460 mle = hlist_entry(list, struct dlm_master_list_entry,
461 master_hash_node);
462 ++total;
463 ++bucket_count;
464 if (len - out < 200)
465 continue;
466 out += dump_mle(mle, buf + out, len - out);
467 }
468 longest = max(longest, bucket_count);
469 bucket_count = 0;
470 }
471 spin_unlock(&dlm->master_lock);
472
473 out += snprintf(buf + out, len - out,
474 "Total: %ld, Longest: %ld\n", total, longest);
475 return out;
476 }
477
478 static int debug_mle_open(struct inode *inode, struct file *file)
479 {
480 struct dlm_ctxt *dlm = inode->i_private;
481 char *buf = NULL;
482
483 buf = (char *) get_zeroed_page(GFP_NOFS);
484 if (!buf)
485 goto bail;
486
487 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
488
489 file->private_data = buf;
490
491 return 0;
492 bail:
493 return -ENOMEM;
494 }
495
496 static const struct file_operations debug_mle_fops = {
497 .open = debug_mle_open,
498 .release = debug_release,
499 .read = debug_read,
500 .llseek = generic_file_llseek,
501 };
502
503 /* end - debug mle funcs */
504
505 /* begin - debug lockres funcs */
506 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
507 {
508 int out;
509
510 #define DEBUG_LOCK_VERSION 1
511 spin_lock(&lock->spinlock);
512 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
513 "%d,%d,%d,%d\n",
514 DEBUG_LOCK_VERSION,
515 list_type, lock->ml.type, lock->ml.convert_type,
516 lock->ml.node,
517 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
518 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
519 !list_empty(&lock->ast_list),
520 !list_empty(&lock->bast_list),
521 lock->ast_pending, lock->bast_pending,
522 lock->convert_pending, lock->lock_pending,
523 lock->cancel_pending, lock->unlock_pending,
524 atomic_read(&lock->lock_refs.refcount));
525 spin_unlock(&lock->spinlock);
526
527 return out;
528 }
529
530 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
531 {
532 struct dlm_lock *lock;
533 int i;
534 int out = 0;
535
536 out += snprintf(buf + out, len - out, "NAME:");
537 out += stringify_lockname(res->lockname.name, res->lockname.len,
538 buf + out, len - out);
539 out += snprintf(buf + out, len - out, "\n");
540
541 #define DEBUG_LRES_VERSION 1
542 out += snprintf(buf + out, len - out,
543 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
544 DEBUG_LRES_VERSION,
545 res->owner, res->state, res->last_used,
546 !list_empty(&res->purge),
547 !list_empty(&res->dirty),
548 !list_empty(&res->recovering),
549 res->inflight_locks, res->migration_pending,
550 atomic_read(&res->asts_reserved),
551 atomic_read(&res->refs.refcount));
552
553 /* refmap */
554 out += snprintf(buf + out, len - out, "RMAP:");
555 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
556 buf + out, len - out);
557 out += snprintf(buf + out, len - out, "\n");
558
559 /* lvb */
560 out += snprintf(buf + out, len - out, "LVBX:");
561 for (i = 0; i < DLM_LVB_LEN; i++)
562 out += snprintf(buf + out, len - out,
563 "%02x", (unsigned char)res->lvb[i]);
564 out += snprintf(buf + out, len - out, "\n");
565
566 /* granted */
567 list_for_each_entry(lock, &res->granted, list)
568 out += dump_lock(lock, 0, buf + out, len - out);
569
570 /* converting */
571 list_for_each_entry(lock, &res->converting, list)
572 out += dump_lock(lock, 1, buf + out, len - out);
573
574 /* blocked */
575 list_for_each_entry(lock, &res->blocked, list)
576 out += dump_lock(lock, 2, buf + out, len - out);
577
578 out += snprintf(buf + out, len - out, "\n");
579
580 return out;
581 }
582
583 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
584 {
585 struct debug_lockres *dl = m->private;
586 struct dlm_ctxt *dlm = dl->dl_ctxt;
587 struct dlm_lock_resource *oldres = dl->dl_res;
588 struct dlm_lock_resource *res = NULL;
589 struct list_head *track_list;
590
591 spin_lock(&dlm->track_lock);
592 if (oldres)
593 track_list = &oldres->tracking;
594 else {
595 track_list = &dlm->tracking_list;
596 if (list_empty(track_list)) {
597 dl = NULL;
598 spin_unlock(&dlm->track_lock);
599 goto bail;
600 }
601 }
602
603 list_for_each_entry(res, track_list, tracking) {
604 if (&res->tracking == &dlm->tracking_list)
605 res = NULL;
606 else
607 dlm_lockres_get(res);
608 break;
609 }
610 spin_unlock(&dlm->track_lock);
611
612 if (oldres)
613 dlm_lockres_put(oldres);
614
615 dl->dl_res = res;
616
617 if (res) {
618 spin_lock(&res->spinlock);
619 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
620 spin_unlock(&res->spinlock);
621 } else
622 dl = NULL;
623
624 bail:
625 /* passed to seq_show */
626 return dl;
627 }
628
629 static void lockres_seq_stop(struct seq_file *m, void *v)
630 {
631 }
632
633 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
634 {
635 return NULL;
636 }
637
638 static int lockres_seq_show(struct seq_file *s, void *v)
639 {
640 struct debug_lockres *dl = (struct debug_lockres *)v;
641
642 seq_printf(s, "%s", dl->dl_buf);
643
644 return 0;
645 }
646
647 static const struct seq_operations debug_lockres_ops = {
648 .start = lockres_seq_start,
649 .stop = lockres_seq_stop,
650 .next = lockres_seq_next,
651 .show = lockres_seq_show,
652 };
653
654 static int debug_lockres_open(struct inode *inode, struct file *file)
655 {
656 struct dlm_ctxt *dlm = inode->i_private;
657 int ret = -ENOMEM;
658 struct seq_file *seq;
659 struct debug_lockres *dl = NULL;
660
661 dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
662 if (!dl) {
663 mlog_errno(ret);
664 goto bail;
665 }
666
667 dl->dl_len = PAGE_SIZE;
668 dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
669 if (!dl->dl_buf) {
670 mlog_errno(ret);
671 goto bail;
672 }
673
674 ret = seq_open(file, &debug_lockres_ops);
675 if (ret) {
676 mlog_errno(ret);
677 goto bail;
678 }
679
680 seq = file->private_data;
681 seq->private = dl;
682
683 dlm_grab(dlm);
684 dl->dl_ctxt = dlm;
685
686 return 0;
687 bail:
688 if (dl)
689 kfree(dl->dl_buf);
690 kfree(dl);
691 return ret;
692 }
693
694 static int debug_lockres_release(struct inode *inode, struct file *file)
695 {
696 struct seq_file *seq = file->private_data;
697 struct debug_lockres *dl = (struct debug_lockres *)seq->private;
698
699 if (dl->dl_res)
700 dlm_lockres_put(dl->dl_res);
701 dlm_put(dl->dl_ctxt);
702 kfree(dl->dl_buf);
703 return seq_release_private(inode, file);
704 }
705
706 static const struct file_operations debug_lockres_fops = {
707 .open = debug_lockres_open,
708 .release = debug_lockres_release,
709 .read = seq_read,
710 .llseek = seq_lseek,
711 };
712 /* end - debug lockres funcs */
713
714 /* begin - debug state funcs */
715 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
716 {
717 int out = 0;
718 struct dlm_reco_node_data *node;
719 char *state;
720 int cur_mles = 0, tot_mles = 0;
721 int i;
722
723 spin_lock(&dlm->spinlock);
724
725 switch (dlm->dlm_state) {
726 case DLM_CTXT_NEW:
727 state = "NEW"; break;
728 case DLM_CTXT_JOINED:
729 state = "JOINED"; break;
730 case DLM_CTXT_IN_SHUTDOWN:
731 state = "SHUTDOWN"; break;
732 case DLM_CTXT_LEAVING:
733 state = "LEAVING"; break;
734 default:
735 state = "UNKNOWN"; break;
736 }
737
738 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */
739 out += snprintf(buf + out, len - out,
740 "Domain: %s Key: 0x%08x Protocol: %d.%d\n",
741 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
742 dlm->dlm_locking_proto.pv_minor);
743
744 /* Thread Pid: xxx Node: xxx State: xxxxx */
745 out += snprintf(buf + out, len - out,
746 "Thread Pid: %d Node: %d State: %s\n",
747 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
748
749 /* Number of Joins: xxx Joining Node: xxx */
750 out += snprintf(buf + out, len - out,
751 "Number of Joins: %d Joining Node: %d\n",
752 dlm->num_joins, dlm->joining_node);
753
754 /* Domain Map: xx xx xx */
755 out += snprintf(buf + out, len - out, "Domain Map: ");
756 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
757 buf + out, len - out);
758 out += snprintf(buf + out, len - out, "\n");
759
760 /* Exit Domain Map: xx xx xx */
761 out += snprintf(buf + out, len - out, "Exit Domain Map: ");
762 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES,
763 buf + out, len - out);
764 out += snprintf(buf + out, len - out, "\n");
765
766 /* Live Map: xx xx xx */
767 out += snprintf(buf + out, len - out, "Live Map: ");
768 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
769 buf + out, len - out);
770 out += snprintf(buf + out, len - out, "\n");
771
772 /* Lock Resources: xxx (xxx) */
773 out += snprintf(buf + out, len - out,
774 "Lock Resources: %d (%d)\n",
775 atomic_read(&dlm->res_cur_count),
776 atomic_read(&dlm->res_tot_count));
777
778 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
779 tot_mles += atomic_read(&dlm->mle_tot_count[i]);
780
781 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
782 cur_mles += atomic_read(&dlm->mle_cur_count[i]);
783
784 /* MLEs: xxx (xxx) */
785 out += snprintf(buf + out, len - out,
786 "MLEs: %d (%d)\n", cur_mles, tot_mles);
787
788 /* Blocking: xxx (xxx) */
789 out += snprintf(buf + out, len - out,
790 " Blocking: %d (%d)\n",
791 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
792 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
793
794 /* Mastery: xxx (xxx) */
795 out += snprintf(buf + out, len - out,
796 " Mastery: %d (%d)\n",
797 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
798 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
799
800 /* Migration: xxx (xxx) */
801 out += snprintf(buf + out, len - out,
802 " Migration: %d (%d)\n",
803 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
804 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
805
806 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
807 out += snprintf(buf + out, len - out,
808 "Lists: Dirty=%s Purge=%s PendingASTs=%s "
809 "PendingBASTs=%s\n",
810 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
811 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
812 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
813 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
814
815 /* Purge Count: xxx Refs: xxx */
816 out += snprintf(buf + out, len - out,
817 "Purge Count: %d Refs: %d\n", dlm->purge_count,
818 atomic_read(&dlm->dlm_refs.refcount));
819
820 /* Dead Node: xxx */
821 out += snprintf(buf + out, len - out,
822 "Dead Node: %d\n", dlm->reco.dead_node);
823
824 /* What about DLM_RECO_STATE_FINALIZE? */
825 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
826 state = "ACTIVE";
827 else
828 state = "INACTIVE";
829
830 /* Recovery Pid: xxxx Master: xxx State: xxxx */
831 out += snprintf(buf + out, len - out,
832 "Recovery Pid: %d Master: %d State: %s\n",
833 task_pid_nr(dlm->dlm_reco_thread_task),
834 dlm->reco.new_master, state);
835
836 /* Recovery Map: xx xx */
837 out += snprintf(buf + out, len - out, "Recovery Map: ");
838 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
839 buf + out, len - out);
840 out += snprintf(buf + out, len - out, "\n");
841
842 /* Recovery Node State: */
843 out += snprintf(buf + out, len - out, "Recovery Node State:\n");
844 list_for_each_entry(node, &dlm->reco.node_data, list) {
845 switch (node->state) {
846 case DLM_RECO_NODE_DATA_INIT:
847 state = "INIT";
848 break;
849 case DLM_RECO_NODE_DATA_REQUESTING:
850 state = "REQUESTING";
851 break;
852 case DLM_RECO_NODE_DATA_DEAD:
853 state = "DEAD";
854 break;
855 case DLM_RECO_NODE_DATA_RECEIVING:
856 state = "RECEIVING";
857 break;
858 case DLM_RECO_NODE_DATA_REQUESTED:
859 state = "REQUESTED";
860 break;
861 case DLM_RECO_NODE_DATA_DONE:
862 state = "DONE";
863 break;
864 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
865 state = "FINALIZE-SENT";
866 break;
867 default:
868 state = "BAD";
869 break;
870 }
871 out += snprintf(buf + out, len - out, "\t%u - %s\n",
872 node->node_num, state);
873 }
874
875 spin_unlock(&dlm->spinlock);
876
877 return out;
878 }
879
880 static int debug_state_open(struct inode *inode, struct file *file)
881 {
882 struct dlm_ctxt *dlm = inode->i_private;
883 char *buf = NULL;
884
885 buf = (char *) get_zeroed_page(GFP_NOFS);
886 if (!buf)
887 goto bail;
888
889 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
890
891 file->private_data = buf;
892
893 return 0;
894 bail:
895 return -ENOMEM;
896 }
897
898 static const struct file_operations debug_state_fops = {
899 .open = debug_state_open,
900 .release = debug_release,
901 .read = debug_read,
902 .llseek = generic_file_llseek,
903 };
904 /* end - debug state funcs */
905
906 /* files in subroot */
907 int dlm_debug_init(struct dlm_ctxt *dlm)
908 {
909 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
910
911 /* for dumping dlm_ctxt */
912 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
913 S_IFREG|S_IRUSR,
914 dlm->dlm_debugfs_subroot,
915 dlm, &debug_state_fops);
916 if (!dc->debug_state_dentry) {
917 mlog_errno(-ENOMEM);
918 goto bail;
919 }
920
921 /* for dumping lockres */
922 dc->debug_lockres_dentry =
923 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
924 S_IFREG|S_IRUSR,
925 dlm->dlm_debugfs_subroot,
926 dlm, &debug_lockres_fops);
927 if (!dc->debug_lockres_dentry) {
928 mlog_errno(-ENOMEM);
929 goto bail;
930 }
931
932 /* for dumping mles */
933 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
934 S_IFREG|S_IRUSR,
935 dlm->dlm_debugfs_subroot,
936 dlm, &debug_mle_fops);
937 if (!dc->debug_mle_dentry) {
938 mlog_errno(-ENOMEM);
939 goto bail;
940 }
941
942 /* for dumping lockres on the purge list */
943 dc->debug_purgelist_dentry =
944 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
945 S_IFREG|S_IRUSR,
946 dlm->dlm_debugfs_subroot,
947 dlm, &debug_purgelist_fops);
948 if (!dc->debug_purgelist_dentry) {
949 mlog_errno(-ENOMEM);
950 goto bail;
951 }
952
953 dlm_debug_get(dc);
954 return 0;
955
956 bail:
957 dlm_debug_shutdown(dlm);
958 return -ENOMEM;
959 }
960
961 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
962 {
963 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
964
965 if (dc) {
966 debugfs_remove(dc->debug_purgelist_dentry);
967 debugfs_remove(dc->debug_mle_dentry);
968 debugfs_remove(dc->debug_lockres_dentry);
969 debugfs_remove(dc->debug_state_dentry);
970 dlm_debug_put(dc);
971 }
972 }
973
974 /* subroot - domain dir */
975 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
976 {
977 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
978 dlm_debugfs_root);
979 if (!dlm->dlm_debugfs_subroot) {
980 mlog_errno(-ENOMEM);
981 goto bail;
982 }
983
984 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
985 GFP_KERNEL);
986 if (!dlm->dlm_debug_ctxt) {
987 mlog_errno(-ENOMEM);
988 goto bail;
989 }
990 kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
991
992 return 0;
993 bail:
994 dlm_destroy_debugfs_subroot(dlm);
995 return -ENOMEM;
996 }
997
998 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
999 {
1000 debugfs_remove(dlm->dlm_debugfs_subroot);
1001 }
1002
1003 /* debugfs root */
1004 int dlm_create_debugfs_root(void)
1005 {
1006 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
1007 if (!dlm_debugfs_root) {
1008 mlog_errno(-ENOMEM);
1009 return -ENOMEM;
1010 }
1011 return 0;
1012 }
1013
1014 void dlm_destroy_debugfs_root(void)
1015 {
1016 debugfs_remove(dlm_debugfs_root);
1017 }
1018 #endif /* CONFIG_DEBUG_FS */