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Linux 3.16-rc2
[linux/fpc-iii.git] / fs / ocfs2 / dlm / dlmdebug.c
blob18f13c2e4a108880ce95eef38874df54fb6797bb
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 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_entry(lock, &res->granted, list) {
121 __dlm_print_lock(lock);
122 }
123 printk(" converting queue:\n");
124 list_for_each_entry(lock, &res->converting, list) {
125 __dlm_print_lock(lock);
126 }
127 printk(" blocked queue:\n");
128 list_for_each_entry(lock, &res->blocked, list) {
129 __dlm_print_lock(lock);
130 }
131 }
132
133 void dlm_print_one_lock(struct dlm_lock *lockid)
134 {
135 dlm_print_one_lock_resource(lockid->lockres);
136 }
137 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
138
139 static const char *dlm_errnames[] = {
140 [DLM_NORMAL] = "DLM_NORMAL",
141 [DLM_GRANTED] = "DLM_GRANTED",
142 [DLM_DENIED] = "DLM_DENIED",
143 [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS",
144 [DLM_WORKING] = "DLM_WORKING",
145 [DLM_BLOCKED] = "DLM_BLOCKED",
146 [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN",
147 [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD",
148 [DLM_SYSERR] = "DLM_SYSERR",
149 [DLM_NOSUPPORT] = "DLM_NOSUPPORT",
150 [DLM_CANCELGRANT] = "DLM_CANCELGRANT",
151 [DLM_IVLOCKID] = "DLM_IVLOCKID",
152 [DLM_SYNC] = "DLM_SYNC",
153 [DLM_BADTYPE] = "DLM_BADTYPE",
154 [DLM_BADRESOURCE] = "DLM_BADRESOURCE",
155 [DLM_MAXHANDLES] = "DLM_MAXHANDLES",
156 [DLM_NOCLINFO] = "DLM_NOCLINFO",
157 [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR",
158 [DLM_NOPURGED] = "DLM_NOPURGED",
159 [DLM_BADARGS] = "DLM_BADARGS",
160 [DLM_VOID] = "DLM_VOID",
161 [DLM_NOTQUEUED] = "DLM_NOTQUEUED",
162 [DLM_IVBUFLEN] = "DLM_IVBUFLEN",
163 [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT",
164 [DLM_BADPARAM] = "DLM_BADPARAM",
165 [DLM_VALNOTVALID] = "DLM_VALNOTVALID",
166 [DLM_REJECTED] = "DLM_REJECTED",
167 [DLM_ABORT] = "DLM_ABORT",
168 [DLM_CANCEL] = "DLM_CANCEL",
169 [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE",
170 [DLM_DEADLOCK] = "DLM_DEADLOCK",
171 [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS",
172 [DLM_FORWARD] = "DLM_FORWARD",
173 [DLM_TIMEOUT] = "DLM_TIMEOUT",
174 [DLM_IVGROUPID] = "DLM_IVGROUPID",
175 [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT",
176 [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH",
177 [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION",
178 [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ",
179 [DLM_RECOVERING] = "DLM_RECOVERING",
180 [DLM_MIGRATING] = "DLM_MIGRATING",
181 [DLM_MAXSTATS] = "DLM_MAXSTATS",
182 };
183
184 static const char *dlm_errmsgs[] = {
185 [DLM_NORMAL] = "request in progress",
186 [DLM_GRANTED] = "request granted",
187 [DLM_DENIED] = "request denied",
188 [DLM_DENIED_NOLOCKS] = "request denied, out of system resources",
189 [DLM_WORKING] = "async request in progress",
190 [DLM_BLOCKED] = "lock request blocked",
191 [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock",
192 [DLM_DENIED_GRACE_PERIOD] = "topological change in progress",
193 [DLM_SYSERR] = "system error",
194 [DLM_NOSUPPORT] = "unsupported",
195 [DLM_CANCELGRANT] = "can't cancel convert: already granted",
196 [DLM_IVLOCKID] = "bad lockid",
197 [DLM_SYNC] = "synchronous request granted",
198 [DLM_BADTYPE] = "bad resource type",
199 [DLM_BADRESOURCE] = "bad resource handle",
200 [DLM_MAXHANDLES] = "no more resource handles",
201 [DLM_NOCLINFO] = "can't contact cluster manager",
202 [DLM_NOLOCKMGR] = "can't contact lock manager",
203 [DLM_NOPURGED] = "can't contact purge daemon",
204 [DLM_BADARGS] = "bad api args",
205 [DLM_VOID] = "no status",
206 [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed",
207 [DLM_IVBUFLEN] = "invalid resource name length",
208 [DLM_CVTUNGRANT] = "attempted to convert ungranted lock",
209 [DLM_BADPARAM] = "invalid lock mode specified",
210 [DLM_VALNOTVALID] = "value block has been invalidated",
211 [DLM_REJECTED] = "request rejected, unrecognized client",
212 [DLM_ABORT] = "blocked lock request cancelled",
213 [DLM_CANCEL] = "conversion request cancelled",
214 [DLM_IVRESHANDLE] = "invalid resource handle",
215 [DLM_DEADLOCK] = "deadlock recovery refused this request",
216 [DLM_DENIED_NOASTS] = "failed to allocate AST",
217 [DLM_FORWARD] = "request must wait for primary's response",
218 [DLM_TIMEOUT] = "timeout value for lock has expired",
219 [DLM_IVGROUPID] = "invalid group specification",
220 [DLM_VERS_CONFLICT] = "version conflicts prevent request handling",
221 [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong",
222 [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device",
223 [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ",
224 [DLM_RECOVERING] = "lock resource being recovered",
225 [DLM_MIGRATING] = "lock resource being migrated",
226 [DLM_MAXSTATS] = "invalid error number",
227 };
228
229 const char *dlm_errmsg(enum dlm_status err)
230 {
231 if (err >= DLM_MAXSTATS || err < 0)
232 return dlm_errmsgs[DLM_MAXSTATS];
233 return dlm_errmsgs[err];
234 }
235 EXPORT_SYMBOL_GPL(dlm_errmsg);
236
237 const char *dlm_errname(enum dlm_status err)
238 {
239 if (err >= DLM_MAXSTATS || err < 0)
240 return dlm_errnames[DLM_MAXSTATS];
241 return dlm_errnames[err];
242 }
243 EXPORT_SYMBOL_GPL(dlm_errname);
244
245 /* NOTE: This function converts a lockname into a string. It uses knowledge
246 * of the format of the lockname that should be outside the purview of the dlm.
247 * We are adding only to make dlm debugging slightly easier.
248 *
249 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
250 */
251 static int stringify_lockname(const char *lockname, int locklen, char *buf,
252 int len)
253 {
254 int out = 0;
255 __be64 inode_blkno_be;
256
257 #define OCFS2_DENTRY_LOCK_INO_START 18
258 if (*lockname == 'N') {
259 memcpy((__be64 *)&inode_blkno_be,
260 (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
261 sizeof(__be64));
262 out += snprintf(buf + out, len - out, "%.*s%08x",
263 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
264 (unsigned int)be64_to_cpu(inode_blkno_be));
265 } else
266 out += snprintf(buf + out, len - out, "%.*s",
267 locklen, lockname);
268 return out;
269 }
270
271 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
272 char *buf, int len)
273 {
274 int out = 0;
275 int i = -1;
276
277 while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
278 out += snprintf(buf + out, len - out, "%d ", i);
279
280 return out;
281 }
282
283 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
284 {
285 int out = 0;
286 char *mle_type;
287
288 if (mle->type == DLM_MLE_BLOCK)
289 mle_type = "BLK";
290 else if (mle->type == DLM_MLE_MASTER)
291 mle_type = "MAS";
292 else
293 mle_type = "MIG";
294
295 out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
296 out += snprintf(buf + out, len - out,
297 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
298 mle_type, mle->master, mle->new_master,
299 !list_empty(&mle->hb_events),
300 !!mle->inuse,
301 atomic_read(&mle->mle_refs.refcount));
302
303 out += snprintf(buf + out, len - out, "Maybe=");
304 out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
305 buf + out, len - out);
306 out += snprintf(buf + out, len - out, "\n");
307
308 out += snprintf(buf + out, len - out, "Vote=");
309 out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
310 buf + out, len - out);
311 out += snprintf(buf + out, len - out, "\n");
312
313 out += snprintf(buf + out, len - out, "Response=");
314 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
315 buf + out, len - out);
316 out += snprintf(buf + out, len - out, "\n");
317
318 out += snprintf(buf + out, len - out, "Node=");
319 out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
320 buf + out, len - out);
321 out += snprintf(buf + out, len - out, "\n");
322
323 out += snprintf(buf + out, len - out, "\n");
324
325 return out;
326 }
327
328 void dlm_print_one_mle(struct dlm_master_list_entry *mle)
329 {
330 char *buf;
331
332 buf = (char *) get_zeroed_page(GFP_NOFS);
333 if (buf) {
334 dump_mle(mle, buf, PAGE_SIZE - 1);
335 free_page((unsigned long)buf);
336 }
337 }
338
339 #ifdef CONFIG_DEBUG_FS
340
341 static struct dentry *dlm_debugfs_root;
342
343 #define DLM_DEBUGFS_DIR "o2dlm"
344 #define DLM_DEBUGFS_DLM_STATE "dlm_state"
345 #define DLM_DEBUGFS_LOCKING_STATE "locking_state"
346 #define DLM_DEBUGFS_MLE_STATE "mle_state"
347 #define DLM_DEBUGFS_PURGE_LIST "purge_list"
348
349 /* begin - utils funcs */
350 static void dlm_debug_free(struct kref *kref)
351 {
352 struct dlm_debug_ctxt *dc;
353
354 dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
355
356 kfree(dc);
357 }
358
359 static void dlm_debug_put(struct dlm_debug_ctxt *dc)
360 {
361 if (dc)
362 kref_put(&dc->debug_refcnt, dlm_debug_free);
363 }
364
365 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
366 {
367 kref_get(&dc->debug_refcnt);
368 }
369
370 static int debug_release(struct inode *inode, struct file *file)
371 {
372 free_page((unsigned long)file->private_data);
373 return 0;
374 }
375
376 static ssize_t debug_read(struct file *file, char __user *buf,
377 size_t nbytes, loff_t *ppos)
378 {
379 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
380 i_size_read(file->f_mapping->host));
381 }
382 /* end - util funcs */
383
384 /* begin - purge list funcs */
385 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
386 {
387 struct dlm_lock_resource *res;
388 int out = 0;
389 unsigned long total = 0;
390
391 out += snprintf(buf + out, len - out,
392 "Dumping Purgelist for Domain: %s\n", dlm->name);
393
394 spin_lock(&dlm->spinlock);
395 list_for_each_entry(res, &dlm->purge_list, purge) {
396 ++total;
397 if (len - out < 100)
398 continue;
399 spin_lock(&res->spinlock);
400 out += stringify_lockname(res->lockname.name,
401 res->lockname.len,
402 buf + out, len - out);
403 out += snprintf(buf + out, len - out, "\t%ld\n",
404 (jiffies - res->last_used)/HZ);
405 spin_unlock(&res->spinlock);
406 }
407 spin_unlock(&dlm->spinlock);
408
409 out += snprintf(buf + out, len - out, "Total on list: %ld\n", total);
410
411 return out;
412 }
413
414 static int debug_purgelist_open(struct inode *inode, struct file *file)
415 {
416 struct dlm_ctxt *dlm = inode->i_private;
417 char *buf = NULL;
418
419 buf = (char *) get_zeroed_page(GFP_NOFS);
420 if (!buf)
421 goto bail;
422
423 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
424
425 file->private_data = buf;
426
427 return 0;
428 bail:
429 return -ENOMEM;
430 }
431
432 static const struct file_operations debug_purgelist_fops = {
433 .open = debug_purgelist_open,
434 .release = debug_release,
435 .read = debug_read,
436 .llseek = generic_file_llseek,
437 };
438 /* end - purge list funcs */
439
440 /* begin - debug mle funcs */
441 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
442 {
443 struct dlm_master_list_entry *mle;
444 struct hlist_head *bucket;
445 int i, out = 0;
446 unsigned long total = 0, longest = 0, bucket_count = 0;
447
448 out += snprintf(buf + out, len - out,
449 "Dumping MLEs for Domain: %s\n", dlm->name);
450
451 spin_lock(&dlm->master_lock);
452 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
453 bucket = dlm_master_hash(dlm, i);
454 hlist_for_each_entry(mle, bucket, master_hash_node) {
455 ++total;
456 ++bucket_count;
457 if (len - out < 200)
458 continue;
459 out += dump_mle(mle, buf + out, len - out);
460 }
461 longest = max(longest, bucket_count);
462 bucket_count = 0;
463 }
464 spin_unlock(&dlm->master_lock);
465
466 out += snprintf(buf + out, len - out,
467 "Total: %ld, Longest: %ld\n", total, longest);
468 return out;
469 }
470
471 static int debug_mle_open(struct inode *inode, struct file *file)
472 {
473 struct dlm_ctxt *dlm = inode->i_private;
474 char *buf = NULL;
475
476 buf = (char *) get_zeroed_page(GFP_NOFS);
477 if (!buf)
478 goto bail;
479
480 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
481
482 file->private_data = buf;
483
484 return 0;
485 bail:
486 return -ENOMEM;
487 }
488
489 static const struct file_operations debug_mle_fops = {
490 .open = debug_mle_open,
491 .release = debug_release,
492 .read = debug_read,
493 .llseek = generic_file_llseek,
494 };
495
496 /* end - debug mle funcs */
497
498 /* begin - debug lockres funcs */
499 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
500 {
501 int out;
502
503 #define DEBUG_LOCK_VERSION 1
504 spin_lock(&lock->spinlock);
505 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
506 "%d,%d,%d,%d\n",
507 DEBUG_LOCK_VERSION,
508 list_type, lock->ml.type, lock->ml.convert_type,
509 lock->ml.node,
510 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
511 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
512 !list_empty(&lock->ast_list),
513 !list_empty(&lock->bast_list),
514 lock->ast_pending, lock->bast_pending,
515 lock->convert_pending, lock->lock_pending,
516 lock->cancel_pending, lock->unlock_pending,
517 atomic_read(&lock->lock_refs.refcount));
518 spin_unlock(&lock->spinlock);
519
520 return out;
521 }
522
523 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
524 {
525 struct dlm_lock *lock;
526 int i;
527 int out = 0;
528
529 out += snprintf(buf + out, len - out, "NAME:");
530 out += stringify_lockname(res->lockname.name, res->lockname.len,
531 buf + out, len - out);
532 out += snprintf(buf + out, len - out, "\n");
533
534 #define DEBUG_LRES_VERSION 1
535 out += snprintf(buf + out, len - out,
536 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
537 DEBUG_LRES_VERSION,
538 res->owner, res->state, res->last_used,
539 !list_empty(&res->purge),
540 !list_empty(&res->dirty),
541 !list_empty(&res->recovering),
542 res->inflight_locks, res->migration_pending,
543 atomic_read(&res->asts_reserved),
544 atomic_read(&res->refs.refcount));
545
546 /* refmap */
547 out += snprintf(buf + out, len - out, "RMAP:");
548 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
549 buf + out, len - out);
550 out += snprintf(buf + out, len - out, "\n");
551
552 /* lvb */
553 out += snprintf(buf + out, len - out, "LVBX:");
554 for (i = 0; i < DLM_LVB_LEN; i++)
555 out += snprintf(buf + out, len - out,
556 "%02x", (unsigned char)res->lvb[i]);
557 out += snprintf(buf + out, len - out, "\n");
558
559 /* granted */
560 list_for_each_entry(lock, &res->granted, list)
561 out += dump_lock(lock, 0, buf + out, len - out);
562
563 /* converting */
564 list_for_each_entry(lock, &res->converting, list)
565 out += dump_lock(lock, 1, buf + out, len - out);
566
567 /* blocked */
568 list_for_each_entry(lock, &res->blocked, list)
569 out += dump_lock(lock, 2, buf + out, len - out);
570
571 out += snprintf(buf + out, len - out, "\n");
572
573 return out;
574 }
575
576 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
577 {
578 struct debug_lockres *dl = m->private;
579 struct dlm_ctxt *dlm = dl->dl_ctxt;
580 struct dlm_lock_resource *oldres = dl->dl_res;
581 struct dlm_lock_resource *res = NULL;
582 struct list_head *track_list;
583
584 spin_lock(&dlm->track_lock);
585 if (oldres)
586 track_list = &oldres->tracking;
587 else {
588 track_list = &dlm->tracking_list;
589 if (list_empty(track_list)) {
590 dl = NULL;
591 spin_unlock(&dlm->track_lock);
592 goto bail;
593 }
594 }
595
596 list_for_each_entry(res, track_list, tracking) {
597 if (&res->tracking == &dlm->tracking_list)
598 res = NULL;
599 else
600 dlm_lockres_get(res);
601 break;
602 }
603 spin_unlock(&dlm->track_lock);
604
605 if (oldres)
606 dlm_lockres_put(oldres);
607
608 dl->dl_res = res;
609
610 if (res) {
611 spin_lock(&res->spinlock);
612 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
613 spin_unlock(&res->spinlock);
614 } else
615 dl = NULL;
616
617 bail:
618 /* passed to seq_show */
619 return dl;
620 }
621
622 static void lockres_seq_stop(struct seq_file *m, void *v)
623 {
624 }
625
626 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
627 {
628 return NULL;
629 }
630
631 static int lockres_seq_show(struct seq_file *s, void *v)
632 {
633 struct debug_lockres *dl = (struct debug_lockres *)v;
634
635 seq_printf(s, "%s", dl->dl_buf);
636
637 return 0;
638 }
639
640 static const struct seq_operations debug_lockres_ops = {
641 .start = lockres_seq_start,
642 .stop = lockres_seq_stop,
643 .next = lockres_seq_next,
644 .show = lockres_seq_show,
645 };
646
647 static int debug_lockres_open(struct inode *inode, struct file *file)
648 {
649 struct dlm_ctxt *dlm = inode->i_private;
650 int ret = -ENOMEM;
651 struct seq_file *seq;
652 struct debug_lockres *dl = NULL;
653
654 dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
655 if (!dl) {
656 mlog_errno(ret);
657 goto bail;
658 }
659
660 dl->dl_len = PAGE_SIZE;
661 dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
662 if (!dl->dl_buf) {
663 mlog_errno(ret);
664 goto bail;
665 }
666
667 ret = seq_open(file, &debug_lockres_ops);
668 if (ret) {
669 mlog_errno(ret);
670 goto bail;
671 }
672
673 seq = file->private_data;
674 seq->private = dl;
675
676 dlm_grab(dlm);
677 dl->dl_ctxt = dlm;
678
679 return 0;
680 bail:
681 if (dl)
682 kfree(dl->dl_buf);
683 kfree(dl);
684 return ret;
685 }
686
687 static int debug_lockres_release(struct inode *inode, struct file *file)
688 {
689 struct seq_file *seq = file->private_data;
690 struct debug_lockres *dl = (struct debug_lockres *)seq->private;
691
692 if (dl->dl_res)
693 dlm_lockres_put(dl->dl_res);
694 dlm_put(dl->dl_ctxt);
695 kfree(dl->dl_buf);
696 return seq_release_private(inode, file);
697 }
698
699 static const struct file_operations debug_lockres_fops = {
700 .open = debug_lockres_open,
701 .release = debug_lockres_release,
702 .read = seq_read,
703 .llseek = seq_lseek,
704 };
705 /* end - debug lockres funcs */
706
707 /* begin - debug state funcs */
708 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
709 {
710 int out = 0;
711 struct dlm_reco_node_data *node;
712 char *state;
713 int cur_mles = 0, tot_mles = 0;
714 int i;
715
716 spin_lock(&dlm->spinlock);
717
718 switch (dlm->dlm_state) {
719 case DLM_CTXT_NEW:
720 state = "NEW"; break;
721 case DLM_CTXT_JOINED:
722 state = "JOINED"; break;
723 case DLM_CTXT_IN_SHUTDOWN:
724 state = "SHUTDOWN"; break;
725 case DLM_CTXT_LEAVING:
726 state = "LEAVING"; break;
727 default:
728 state = "UNKNOWN"; break;
729 }
730
731 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */
732 out += snprintf(buf + out, len - out,
733 "Domain: %s Key: 0x%08x Protocol: %d.%d\n",
734 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
735 dlm->dlm_locking_proto.pv_minor);
736
737 /* Thread Pid: xxx Node: xxx State: xxxxx */
738 out += snprintf(buf + out, len - out,
739 "Thread Pid: %d Node: %d State: %s\n",
740 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
741
742 /* Number of Joins: xxx Joining Node: xxx */
743 out += snprintf(buf + out, len - out,
744 "Number of Joins: %d Joining Node: %d\n",
745 dlm->num_joins, dlm->joining_node);
746
747 /* Domain Map: xx xx xx */
748 out += snprintf(buf + out, len - out, "Domain Map: ");
749 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
750 buf + out, len - out);
751 out += snprintf(buf + out, len - out, "\n");
752
753 /* Exit Domain Map: xx xx xx */
754 out += snprintf(buf + out, len - out, "Exit Domain Map: ");
755 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES,
756 buf + out, len - out);
757 out += snprintf(buf + out, len - out, "\n");
758
759 /* Live Map: xx xx xx */
760 out += snprintf(buf + out, len - out, "Live Map: ");
761 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
762 buf + out, len - out);
763 out += snprintf(buf + out, len - out, "\n");
764
765 /* Lock Resources: xxx (xxx) */
766 out += snprintf(buf + out, len - out,
767 "Lock Resources: %d (%d)\n",
768 atomic_read(&dlm->res_cur_count),
769 atomic_read(&dlm->res_tot_count));
770
771 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
772 tot_mles += atomic_read(&dlm->mle_tot_count[i]);
773
774 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
775 cur_mles += atomic_read(&dlm->mle_cur_count[i]);
776
777 /* MLEs: xxx (xxx) */
778 out += snprintf(buf + out, len - out,
779 "MLEs: %d (%d)\n", cur_mles, tot_mles);
780
781 /* Blocking: xxx (xxx) */
782 out += snprintf(buf + out, len - out,
783 " Blocking: %d (%d)\n",
784 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
785 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
786
787 /* Mastery: xxx (xxx) */
788 out += snprintf(buf + out, len - out,
789 " Mastery: %d (%d)\n",
790 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
791 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
792
793 /* Migration: xxx (xxx) */
794 out += snprintf(buf + out, len - out,
795 " Migration: %d (%d)\n",
796 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
797 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
798
799 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
800 out += snprintf(buf + out, len - out,
801 "Lists: Dirty=%s Purge=%s PendingASTs=%s "
802 "PendingBASTs=%s\n",
803 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
804 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
805 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
806 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
807
808 /* Purge Count: xxx Refs: xxx */
809 out += snprintf(buf + out, len - out,
810 "Purge Count: %d Refs: %d\n", dlm->purge_count,
811 atomic_read(&dlm->dlm_refs.refcount));
812
813 /* Dead Node: xxx */
814 out += snprintf(buf + out, len - out,
815 "Dead Node: %d\n", dlm->reco.dead_node);
816
817 /* What about DLM_RECO_STATE_FINALIZE? */
818 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
819 state = "ACTIVE";
820 else
821 state = "INACTIVE";
822
823 /* Recovery Pid: xxxx Master: xxx State: xxxx */
824 out += snprintf(buf + out, len - out,
825 "Recovery Pid: %d Master: %d State: %s\n",
826 task_pid_nr(dlm->dlm_reco_thread_task),
827 dlm->reco.new_master, state);
828
829 /* Recovery Map: xx xx */
830 out += snprintf(buf + out, len - out, "Recovery Map: ");
831 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
832 buf + out, len - out);
833 out += snprintf(buf + out, len - out, "\n");
834
835 /* Recovery Node State: */
836 out += snprintf(buf + out, len - out, "Recovery Node State:\n");
837 list_for_each_entry(node, &dlm->reco.node_data, list) {
838 switch (node->state) {
839 case DLM_RECO_NODE_DATA_INIT:
840 state = "INIT";
841 break;
842 case DLM_RECO_NODE_DATA_REQUESTING:
843 state = "REQUESTING";
844 break;
845 case DLM_RECO_NODE_DATA_DEAD:
846 state = "DEAD";
847 break;
848 case DLM_RECO_NODE_DATA_RECEIVING:
849 state = "RECEIVING";
850 break;
851 case DLM_RECO_NODE_DATA_REQUESTED:
852 state = "REQUESTED";
853 break;
854 case DLM_RECO_NODE_DATA_DONE:
855 state = "DONE";
856 break;
857 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
858 state = "FINALIZE-SENT";
859 break;
860 default:
861 state = "BAD";
862 break;
863 }
864 out += snprintf(buf + out, len - out, "\t%u - %s\n",
865 node->node_num, state);
866 }
867
868 spin_unlock(&dlm->spinlock);
869
870 return out;
871 }
872
873 static int debug_state_open(struct inode *inode, struct file *file)
874 {
875 struct dlm_ctxt *dlm = inode->i_private;
876 char *buf = NULL;
877
878 buf = (char *) get_zeroed_page(GFP_NOFS);
879 if (!buf)
880 goto bail;
881
882 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
883
884 file->private_data = buf;
885
886 return 0;
887 bail:
888 return -ENOMEM;
889 }
890
891 static const struct file_operations debug_state_fops = {
892 .open = debug_state_open,
893 .release = debug_release,
894 .read = debug_read,
895 .llseek = generic_file_llseek,
896 };
897 /* end - debug state funcs */
898
899 /* files in subroot */
900 int dlm_debug_init(struct dlm_ctxt *dlm)
901 {
902 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
903
904 /* for dumping dlm_ctxt */
905 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
906 S_IFREG|S_IRUSR,
907 dlm->dlm_debugfs_subroot,
908 dlm, &debug_state_fops);
909 if (!dc->debug_state_dentry) {
910 mlog_errno(-ENOMEM);
911 goto bail;
912 }
913
914 /* for dumping lockres */
915 dc->debug_lockres_dentry =
916 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
917 S_IFREG|S_IRUSR,
918 dlm->dlm_debugfs_subroot,
919 dlm, &debug_lockres_fops);
920 if (!dc->debug_lockres_dentry) {
921 mlog_errno(-ENOMEM);
922 goto bail;
923 }
924
925 /* for dumping mles */
926 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
927 S_IFREG|S_IRUSR,
928 dlm->dlm_debugfs_subroot,
929 dlm, &debug_mle_fops);
930 if (!dc->debug_mle_dentry) {
931 mlog_errno(-ENOMEM);
932 goto bail;
933 }
934
935 /* for dumping lockres on the purge list */
936 dc->debug_purgelist_dentry =
937 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
938 S_IFREG|S_IRUSR,
939 dlm->dlm_debugfs_subroot,
940 dlm, &debug_purgelist_fops);
941 if (!dc->debug_purgelist_dentry) {
942 mlog_errno(-ENOMEM);
943 goto bail;
944 }
945
946 dlm_debug_get(dc);
947 return 0;
948
949 bail:
950 dlm_debug_shutdown(dlm);
951 return -ENOMEM;
952 }
953
954 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
955 {
956 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
957
958 if (dc) {
959 debugfs_remove(dc->debug_purgelist_dentry);
960 debugfs_remove(dc->debug_mle_dentry);
961 debugfs_remove(dc->debug_lockres_dentry);
962 debugfs_remove(dc->debug_state_dentry);
963 dlm_debug_put(dc);
964 }
965 }
966
967 /* subroot - domain dir */
968 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
969 {
970 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
971 dlm_debugfs_root);
972 if (!dlm->dlm_debugfs_subroot) {
973 mlog_errno(-ENOMEM);
974 goto bail;
975 }
976
977 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
978 GFP_KERNEL);
979 if (!dlm->dlm_debug_ctxt) {
980 mlog_errno(-ENOMEM);
981 goto bail;
982 }
983 kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
984
985 return 0;
986 bail:
987 dlm_destroy_debugfs_subroot(dlm);
988 return -ENOMEM;
989 }
990
991 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
992 {
993 debugfs_remove(dlm->dlm_debugfs_subroot);
994 }
995
996 /* debugfs root */
997 int dlm_create_debugfs_root(void)
998 {
999 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
1000 if (!dlm_debugfs_root) {
1001 mlog_errno(-ENOMEM);
1002 return -ENOMEM;
1003 }
1004 return 0;
1005 }
1006
1007 void dlm_destroy_debugfs_root(void)
1008 {
1009 debugfs_remove(dlm_debugfs_root);
1010 }
1011 #endif /* CONFIG_DEBUG_FS */
Linux with added FPC-III support