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/utsname.h>
31 #include <linux/sysctl.h>
32 #include <linux/spinlock.h>
33 #include <linux/debugfs.h>
34
35 #include "cluster/heartbeat.h"
36 #include "cluster/nodemanager.h"
37 #include "cluster/tcp.h"
38
39 #include "dlmapi.h"
40 #include "dlmcommon.h"
41 #include "dlmdomain.h"
42 #include "dlmdebug.h"
43
44 #define MLOG_MASK_PREFIX ML_DLM
45 #include "cluster/masklog.h"
46
47 static int stringify_lockname(const char *lockname, int locklen, char *buf,
48 int len);
49
dlm_print_one_lock_resource(struct dlm_lock_resource * res)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
dlm_print_lockres_refmap(struct dlm_lock_resource * res)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
__dlm_print_lock(struct dlm_lock * lock)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
__dlm_print_one_lock_resource(struct dlm_lock_resource * res)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) - 1);
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
dlm_print_one_lock(struct dlm_lock * lockid)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
dlm_errmsg(enum dlm_status err)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
dlm_errname(enum dlm_status err)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 */
stringify_lockname(const char * lockname,int locklen,char * buf,int len)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
stringify_nodemap(unsigned long * nodemap,int maxnodes,char * buf,int len)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
dump_mle(struct dlm_master_list_entry * mle,char * buf,int len)287 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
288 {
289 int out = 0;
290 unsigned int namelen;
291 const char *name;
292 char *mle_type;
293
294 if (mle->type != DLM_MLE_MASTER) {
295 namelen = mle->u.name.len;
296 name = mle->u.name.name;
297 } else {
298 namelen = mle->u.res->lockname.len;
299 name = mle->u.res->lockname.name;
300 }
301
302 if (mle->type == DLM_MLE_BLOCK)
303 mle_type = "BLK";
304 else if (mle->type == DLM_MLE_MASTER)
305 mle_type = "MAS";
306 else
307 mle_type = "MIG";
308
309 out += stringify_lockname(name, namelen, buf + out, len - out);
310 out += snprintf(buf + out, len - out,
311 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
312 mle_type, mle->master, mle->new_master,
313 !list_empty(&mle->hb_events),
314 !!mle->inuse,
315 atomic_read(&mle->mle_refs.refcount));
316
317 out += snprintf(buf + out, len - out, "Maybe=");
318 out += stringify_nodemap(mle->maybe_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, "Vote=");
323 out += stringify_nodemap(mle->vote_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, "Response=");
328 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
329 buf + out, len - out);
330 out += snprintf(buf + out, len - out, "\n");
331
332 out += snprintf(buf + out, len - out, "Node=");
333 out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
334 buf + out, len - out);
335 out += snprintf(buf + out, len - out, "\n");
336
337 out += snprintf(buf + out, len - out, "\n");
338
339 return out;
340 }
341
dlm_print_one_mle(struct dlm_master_list_entry * mle)342 void dlm_print_one_mle(struct dlm_master_list_entry *mle)
343 {
344 char *buf;
345
346 buf = (char *) get_zeroed_page(GFP_NOFS);
347 if (buf) {
348 dump_mle(mle, buf, PAGE_SIZE - 1);
349 free_page((unsigned long)buf);
350 }
351 }
352
353 #ifdef CONFIG_DEBUG_FS
354
355 static struct dentry *dlm_debugfs_root = NULL;
356
357 #define DLM_DEBUGFS_DIR "o2dlm"
358 #define DLM_DEBUGFS_DLM_STATE "dlm_state"
359 #define DLM_DEBUGFS_LOCKING_STATE "locking_state"
360 #define DLM_DEBUGFS_MLE_STATE "mle_state"
361 #define DLM_DEBUGFS_PURGE_LIST "purge_list"
362
363 /* begin - utils funcs */
dlm_debug_free(struct kref * kref)364 static void dlm_debug_free(struct kref *kref)
365 {
366 struct dlm_debug_ctxt *dc;
367
368 dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
369
370 kfree(dc);
371 }
372
dlm_debug_put(struct dlm_debug_ctxt * dc)373 static void dlm_debug_put(struct dlm_debug_ctxt *dc)
374 {
375 if (dc)
376 kref_put(&dc->debug_refcnt, dlm_debug_free);
377 }
378
dlm_debug_get(struct dlm_debug_ctxt * dc)379 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
380 {
381 kref_get(&dc->debug_refcnt);
382 }
383
debug_buffer_allocate(void)384 static struct debug_buffer *debug_buffer_allocate(void)
385 {
386 struct debug_buffer *db = NULL;
387
388 db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
389 if (!db)
390 goto bail;
391
392 db->len = PAGE_SIZE;
393 db->buf = kmalloc(db->len, GFP_KERNEL);
394 if (!db->buf)
395 goto bail;
396
397 return db;
398 bail:
399 kfree(db);
400 return NULL;
401 }
402
debug_buffer_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)403 static ssize_t debug_buffer_read(struct file *file, char __user *buf,
404 size_t nbytes, loff_t *ppos)
405 {
406 struct debug_buffer *db = file->private_data;
407
408 return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
409 }
410
debug_buffer_llseek(struct file * file,loff_t off,int whence)411 static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
412 {
413 struct debug_buffer *db = file->private_data;
414 loff_t new = -1;
415
416 switch (whence) {
417 case 0:
418 new = off;
419 break;
420 case 1:
421 new = file->f_pos + off;
422 break;
423 }
424
425 if (new < 0 || new > db->len)
426 return -EINVAL;
427
428 return (file->f_pos = new);
429 }
430
debug_buffer_release(struct inode * inode,struct file * file)431 static int debug_buffer_release(struct inode *inode, struct file *file)
432 {
433 struct debug_buffer *db = (struct debug_buffer *)file->private_data;
434
435 if (db)
436 kfree(db->buf);
437 kfree(db);
438
439 return 0;
440 }
441 /* end - util funcs */
442
443 /* begin - purge list funcs */
debug_purgelist_print(struct dlm_ctxt * dlm,struct debug_buffer * db)444 static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
445 {
446 struct dlm_lock_resource *res;
447 int out = 0;
448 unsigned long total = 0;
449
450 out += snprintf(db->buf + out, db->len - out,
451 "Dumping Purgelist for Domain: %s\n", dlm->name);
452
453 spin_lock(&dlm->spinlock);
454 list_for_each_entry(res, &dlm->purge_list, purge) {
455 ++total;
456 if (db->len - out < 100)
457 continue;
458 spin_lock(&res->spinlock);
459 out += stringify_lockname(res->lockname.name,
460 res->lockname.len,
461 db->buf + out, db->len - out);
462 out += snprintf(db->buf + out, db->len - out, "\t%ld\n",
463 (jiffies - res->last_used)/HZ);
464 spin_unlock(&res->spinlock);
465 }
466 spin_unlock(&dlm->spinlock);
467
468 out += snprintf(db->buf + out, db->len - out,
469 "Total on list: %ld\n", total);
470
471 return out;
472 }
473
debug_purgelist_open(struct inode * inode,struct file * file)474 static int debug_purgelist_open(struct inode *inode, struct file *file)
475 {
476 struct dlm_ctxt *dlm = inode->i_private;
477 struct debug_buffer *db;
478
479 db = debug_buffer_allocate();
480 if (!db)
481 goto bail;
482
483 db->len = debug_purgelist_print(dlm, db);
484
485 file->private_data = db;
486
487 return 0;
488 bail:
489 return -ENOMEM;
490 }
491
492 static struct file_operations debug_purgelist_fops = {
493 .open = debug_purgelist_open,
494 .release = debug_buffer_release,
495 .read = debug_buffer_read,
496 .llseek = debug_buffer_llseek,
497 };
498 /* end - purge list funcs */
499
500 /* begin - debug mle funcs */
debug_mle_print(struct dlm_ctxt * dlm,struct debug_buffer * db)501 static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
502 {
503 struct dlm_master_list_entry *mle;
504 int out = 0;
505 unsigned long total = 0;
506
507 out += snprintf(db->buf + out, db->len - out,
508 "Dumping MLEs for Domain: %s\n", dlm->name);
509
510 spin_lock(&dlm->master_lock);
511 list_for_each_entry(mle, &dlm->master_list, list) {
512 ++total;
513 if (db->len - out < 200)
514 continue;
515 out += dump_mle(mle, db->buf + out, db->len - out);
516 }
517 spin_unlock(&dlm->master_lock);
518
519 out += snprintf(db->buf + out, db->len - out,
520 "Total on list: %ld\n", total);
521 return out;
522 }
523
debug_mle_open(struct inode * inode,struct file * file)524 static int debug_mle_open(struct inode *inode, struct file *file)
525 {
526 struct dlm_ctxt *dlm = inode->i_private;
527 struct debug_buffer *db;
528
529 db = debug_buffer_allocate();
530 if (!db)
531 goto bail;
532
533 db->len = debug_mle_print(dlm, db);
534
535 file->private_data = db;
536
537 return 0;
538 bail:
539 return -ENOMEM;
540 }
541
542 static struct file_operations debug_mle_fops = {
543 .open = debug_mle_open,
544 .release = debug_buffer_release,
545 .read = debug_buffer_read,
546 .llseek = debug_buffer_llseek,
547 };
548
549 /* end - debug mle funcs */
550
551 /* begin - debug lockres funcs */
dump_lock(struct dlm_lock * lock,int list_type,char * buf,int len)552 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
553 {
554 int out;
555
556 #define DEBUG_LOCK_VERSION 1
557 spin_lock(&lock->spinlock);
558 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
559 "%d,%d,%d,%d\n",
560 DEBUG_LOCK_VERSION,
561 list_type, lock->ml.type, lock->ml.convert_type,
562 lock->ml.node,
563 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
564 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
565 !list_empty(&lock->ast_list),
566 !list_empty(&lock->bast_list),
567 lock->ast_pending, lock->bast_pending,
568 lock->convert_pending, lock->lock_pending,
569 lock->cancel_pending, lock->unlock_pending,
570 atomic_read(&lock->lock_refs.refcount));
571 spin_unlock(&lock->spinlock);
572
573 return out;
574 }
575
dump_lockres(struct dlm_lock_resource * res,char * buf,int len)576 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
577 {
578 struct dlm_lock *lock;
579 int i;
580 int out = 0;
581
582 out += snprintf(buf + out, len - out, "NAME:");
583 out += stringify_lockname(res->lockname.name, res->lockname.len,
584 buf + out, len - out);
585 out += snprintf(buf + out, len - out, "\n");
586
587 #define DEBUG_LRES_VERSION 1
588 out += snprintf(buf + out, len - out,
589 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
590 DEBUG_LRES_VERSION,
591 res->owner, res->state, res->last_used,
592 !list_empty(&res->purge),
593 !list_empty(&res->dirty),
594 !list_empty(&res->recovering),
595 res->inflight_locks, res->migration_pending,
596 atomic_read(&res->asts_reserved),
597 atomic_read(&res->refs.refcount));
598
599 /* refmap */
600 out += snprintf(buf + out, len - out, "RMAP:");
601 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
602 buf + out, len - out);
603 out += snprintf(buf + out, len - out, "\n");
604
605 /* lvb */
606 out += snprintf(buf + out, len - out, "LVBX:");
607 for (i = 0; i < DLM_LVB_LEN; i++)
608 out += snprintf(buf + out, len - out,
609 "%02x", (unsigned char)res->lvb[i]);
610 out += snprintf(buf + out, len - out, "\n");
611
612 /* granted */
613 list_for_each_entry(lock, &res->granted, list)
614 out += dump_lock(lock, 0, buf + out, len - out);
615
616 /* converting */
617 list_for_each_entry(lock, &res->converting, list)
618 out += dump_lock(lock, 1, buf + out, len - out);
619
620 /* blocked */
621 list_for_each_entry(lock, &res->blocked, list)
622 out += dump_lock(lock, 2, buf + out, len - out);
623
624 out += snprintf(buf + out, len - out, "\n");
625
626 return out;
627 }
628
lockres_seq_start(struct seq_file * m,loff_t * pos)629 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
630 {
631 struct debug_lockres *dl = m->private;
632 struct dlm_ctxt *dlm = dl->dl_ctxt;
633 struct dlm_lock_resource *oldres = dl->dl_res;
634 struct dlm_lock_resource *res = NULL;
635 struct list_head *track_list;
636
637 spin_lock(&dlm->track_lock);
638 if (oldres)
639 track_list = &oldres->tracking;
640 else
641 track_list = &dlm->tracking_list;
642
643 list_for_each_entry(res, track_list, tracking) {
644 if (&res->tracking == &dlm->tracking_list)
645 res = NULL;
646 else
647 dlm_lockres_get(res);
648 break;
649 }
650 spin_unlock(&dlm->track_lock);
651
652 if (oldres)
653 dlm_lockres_put(oldres);
654
655 dl->dl_res = res;
656
657 if (res) {
658 spin_lock(&res->spinlock);
659 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
660 spin_unlock(&res->spinlock);
661 } else
662 dl = NULL;
663
664 /* passed to seq_show */
665 return dl;
666 }
667
lockres_seq_stop(struct seq_file * m,void * v)668 static void lockres_seq_stop(struct seq_file *m, void *v)
669 {
670 }
671
lockres_seq_next(struct seq_file * m,void * v,loff_t * pos)672 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
673 {
674 return NULL;
675 }
676
lockres_seq_show(struct seq_file * s,void * v)677 static int lockres_seq_show(struct seq_file *s, void *v)
678 {
679 struct debug_lockres *dl = (struct debug_lockres *)v;
680
681 seq_printf(s, "%s", dl->dl_buf);
682
683 return 0;
684 }
685
686 static struct seq_operations debug_lockres_ops = {
687 .start = lockres_seq_start,
688 .stop = lockres_seq_stop,
689 .next = lockres_seq_next,
690 .show = lockres_seq_show,
691 };
692
debug_lockres_open(struct inode * inode,struct file * file)693 static int debug_lockres_open(struct inode *inode, struct file *file)
694 {
695 struct dlm_ctxt *dlm = inode->i_private;
696 int ret = -ENOMEM;
697 struct seq_file *seq;
698 struct debug_lockres *dl = NULL;
699
700 dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
701 if (!dl) {
702 mlog_errno(ret);
703 goto bail;
704 }
705
706 dl->dl_len = PAGE_SIZE;
707 dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
708 if (!dl->dl_buf) {
709 mlog_errno(ret);
710 goto bail;
711 }
712
713 ret = seq_open(file, &debug_lockres_ops);
714 if (ret) {
715 mlog_errno(ret);
716 goto bail;
717 }
718
719 seq = (struct seq_file *) file->private_data;
720 seq->private = dl;
721
722 dlm_grab(dlm);
723 dl->dl_ctxt = dlm;
724
725 return 0;
726 bail:
727 if (dl)
728 kfree(dl->dl_buf);
729 kfree(dl);
730 return ret;
731 }
732
debug_lockres_release(struct inode * inode,struct file * file)733 static int debug_lockres_release(struct inode *inode, struct file *file)
734 {
735 struct seq_file *seq = (struct seq_file *)file->private_data;
736 struct debug_lockres *dl = (struct debug_lockres *)seq->private;
737
738 if (dl->dl_res)
739 dlm_lockres_put(dl->dl_res);
740 dlm_put(dl->dl_ctxt);
741 kfree(dl->dl_buf);
742 return seq_release_private(inode, file);
743 }
744
745 static struct file_operations debug_lockres_fops = {
746 .open = debug_lockres_open,
747 .release = debug_lockres_release,
748 .read = seq_read,
749 .llseek = seq_lseek,
750 };
751 /* end - debug lockres funcs */
752
753 /* begin - debug state funcs */
debug_state_print(struct dlm_ctxt * dlm,struct debug_buffer * db)754 static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
755 {
756 int out = 0;
757 struct dlm_reco_node_data *node;
758 char *state;
759 int lres, rres, ures, tres;
760
761 lres = atomic_read(&dlm->local_resources);
762 rres = atomic_read(&dlm->remote_resources);
763 ures = atomic_read(&dlm->unknown_resources);
764 tres = lres + rres + ures;
765
766 spin_lock(&dlm->spinlock);
767
768 switch (dlm->dlm_state) {
769 case DLM_CTXT_NEW:
770 state = "NEW"; break;
771 case DLM_CTXT_JOINED:
772 state = "JOINED"; break;
773 case DLM_CTXT_IN_SHUTDOWN:
774 state = "SHUTDOWN"; break;
775 case DLM_CTXT_LEAVING:
776 state = "LEAVING"; break;
777 default:
778 state = "UNKNOWN"; break;
779 }
780
781 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */
782 out += snprintf(db->buf + out, db->len - out,
783 "Domain: %s Key: 0x%08x\n", dlm->name, dlm->key);
784
785 /* Thread Pid: xxx Node: xxx State: xxxxx */
786 out += snprintf(db->buf + out, db->len - out,
787 "Thread Pid: %d Node: %d State: %s\n",
788 dlm->dlm_thread_task->pid, dlm->node_num, state);
789
790 /* Number of Joins: xxx Joining Node: xxx */
791 out += snprintf(db->buf + out, db->len - out,
792 "Number of Joins: %d Joining Node: %d\n",
793 dlm->num_joins, dlm->joining_node);
794
795 /* Domain Map: xx xx xx */
796 out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
797 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
798 db->buf + out, db->len - out);
799 out += snprintf(db->buf + out, db->len - out, "\n");
800
801 /* Live Map: xx xx xx */
802 out += snprintf(db->buf + out, db->len - out, "Live Map: ");
803 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
804 db->buf + out, db->len - out);
805 out += snprintf(db->buf + out, db->len - out, "\n");
806
807 /* Mastered Resources Total: xxx Locally: xxx Remotely: ... */
808 out += snprintf(db->buf + out, db->len - out,
809 "Mastered Resources Total: %d Locally: %d "
810 "Remotely: %d Unknown: %d\n",
811 tres, lres, rres, ures);
812
813 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
814 out += snprintf(db->buf + out, db->len - out,
815 "Lists: Dirty=%s Purge=%s PendingASTs=%s "
816 "PendingBASTs=%s Master=%s\n",
817 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
818 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
819 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
820 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"),
821 (list_empty(&dlm->master_list) ? "Empty" : "InUse"));
822
823 /* Purge Count: xxx Refs: xxx */
824 out += snprintf(db->buf + out, db->len - out,
825 "Purge Count: %d Refs: %d\n", dlm->purge_count,
826 atomic_read(&dlm->dlm_refs.refcount));
827
828 /* Dead Node: xxx */
829 out += snprintf(db->buf + out, db->len - out,
830 "Dead Node: %d\n", dlm->reco.dead_node);
831
832 /* What about DLM_RECO_STATE_FINALIZE? */
833 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
834 state = "ACTIVE";
835 else
836 state = "INACTIVE";
837
838 /* Recovery Pid: xxxx Master: xxx State: xxxx */
839 out += snprintf(db->buf + out, db->len - out,
840 "Recovery Pid: %d Master: %d State: %s\n",
841 dlm->dlm_reco_thread_task->pid,
842 dlm->reco.new_master, state);
843
844 /* Recovery Map: xx xx */
845 out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
846 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
847 db->buf + out, db->len - out);
848 out += snprintf(db->buf + out, db->len - out, "\n");
849
850 /* Recovery Node State: */
851 out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
852 list_for_each_entry(node, &dlm->reco.node_data, list) {
853 switch (node->state) {
854 case DLM_RECO_NODE_DATA_INIT:
855 state = "INIT";
856 break;
857 case DLM_RECO_NODE_DATA_REQUESTING:
858 state = "REQUESTING";
859 break;
860 case DLM_RECO_NODE_DATA_DEAD:
861 state = "DEAD";
862 break;
863 case DLM_RECO_NODE_DATA_RECEIVING:
864 state = "RECEIVING";
865 break;
866 case DLM_RECO_NODE_DATA_REQUESTED:
867 state = "REQUESTED";
868 break;
869 case DLM_RECO_NODE_DATA_DONE:
870 state = "DONE";
871 break;
872 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
873 state = "FINALIZE-SENT";
874 break;
875 default:
876 state = "BAD";
877 break;
878 }
879 out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
880 node->node_num, state);
881 }
882
883 spin_unlock(&dlm->spinlock);
884
885 return out;
886 }
887
debug_state_open(struct inode * inode,struct file * file)888 static int debug_state_open(struct inode *inode, struct file *file)
889 {
890 struct dlm_ctxt *dlm = inode->i_private;
891 struct debug_buffer *db = NULL;
892
893 db = debug_buffer_allocate();
894 if (!db)
895 goto bail;
896
897 db->len = debug_state_print(dlm, db);
898
899 file->private_data = db;
900
901 return 0;
902 bail:
903 return -ENOMEM;
904 }
905
906 static struct file_operations debug_state_fops = {
907 .open = debug_state_open,
908 .release = debug_buffer_release,
909 .read = debug_buffer_read,
910 .llseek = debug_buffer_llseek,
911 };
912 /* end - debug state funcs */
913
914 /* files in subroot */
dlm_debug_init(struct dlm_ctxt * dlm)915 int dlm_debug_init(struct dlm_ctxt *dlm)
916 {
917 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
918
919 /* for dumping dlm_ctxt */
920 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
921 S_IFREG|S_IRUSR,
922 dlm->dlm_debugfs_subroot,
923 dlm, &debug_state_fops);
924 if (!dc->debug_state_dentry) {
925 mlog_errno(-ENOMEM);
926 goto bail;
927 }
928
929 /* for dumping lockres */
930 dc->debug_lockres_dentry =
931 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
932 S_IFREG|S_IRUSR,
933 dlm->dlm_debugfs_subroot,
934 dlm, &debug_lockres_fops);
935 if (!dc->debug_lockres_dentry) {
936 mlog_errno(-ENOMEM);
937 goto bail;
938 }
939
940 /* for dumping mles */
941 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
942 S_IFREG|S_IRUSR,
943 dlm->dlm_debugfs_subroot,
944 dlm, &debug_mle_fops);
945 if (!dc->debug_mle_dentry) {
946 mlog_errno(-ENOMEM);
947 goto bail;
948 }
949
950 /* for dumping lockres on the purge list */
951 dc->debug_purgelist_dentry =
952 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
953 S_IFREG|S_IRUSR,
954 dlm->dlm_debugfs_subroot,
955 dlm, &debug_purgelist_fops);
956 if (!dc->debug_purgelist_dentry) {
957 mlog_errno(-ENOMEM);
958 goto bail;
959 }
960
961 dlm_debug_get(dc);
962 return 0;
963
964 bail:
965 dlm_debug_shutdown(dlm);
966 return -ENOMEM;
967 }
968
dlm_debug_shutdown(struct dlm_ctxt * dlm)969 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
970 {
971 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
972
973 if (dc) {
974 if (dc->debug_purgelist_dentry)
975 debugfs_remove(dc->debug_purgelist_dentry);
976 if (dc->debug_mle_dentry)
977 debugfs_remove(dc->debug_mle_dentry);
978 if (dc->debug_lockres_dentry)
979 debugfs_remove(dc->debug_lockres_dentry);
980 if (dc->debug_state_dentry)
981 debugfs_remove(dc->debug_state_dentry);
982 dlm_debug_put(dc);
983 }
984 }
985
986 /* subroot - domain dir */
dlm_create_debugfs_subroot(struct dlm_ctxt * dlm)987 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
988 {
989 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
990 dlm_debugfs_root);
991 if (!dlm->dlm_debugfs_subroot) {
992 mlog_errno(-ENOMEM);
993 goto bail;
994 }
995
996 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
997 GFP_KERNEL);
998 if (!dlm->dlm_debug_ctxt) {
999 mlog_errno(-ENOMEM);
1000 goto bail;
1001 }
1002 kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
1003
1004 return 0;
1005 bail:
1006 dlm_destroy_debugfs_subroot(dlm);
1007 return -ENOMEM;
1008 }
1009
dlm_destroy_debugfs_subroot(struct dlm_ctxt * dlm)1010 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
1011 {
1012 if (dlm->dlm_debugfs_subroot)
1013 debugfs_remove(dlm->dlm_debugfs_subroot);
1014 }
1015
1016 /* debugfs root */
dlm_create_debugfs_root(void)1017 int dlm_create_debugfs_root(void)
1018 {
1019 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
1020 if (!dlm_debugfs_root) {
1021 mlog_errno(-ENOMEM);
1022 return -ENOMEM;
1023 }
1024 return 0;
1025 }
1026
dlm_destroy_debugfs_root(void)1027 void dlm_destroy_debugfs_root(void)
1028 {
1029 if (dlm_debugfs_root)
1030 debugfs_remove(dlm_debugfs_root);
1031 }
1032 #endif /* CONFIG_DEBUG_FS */
1033