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
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 kref_read(&lock->lock_refs),
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 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, kref_read(&res->refs),
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
dlm_print_one_lock(struct dlm_lock * lockid)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
dlm_errmsg(enum dlm_status err)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
dlm_errname(enum dlm_status err)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 */
stringify_lockname(const char * lockname,int locklen,char * buf,int len)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
stringify_nodemap(unsigned long * nodemap,int maxnodes,char * buf,int len)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
dump_mle(struct dlm_master_list_entry * mle,char * buf,int len)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 kref_read(&mle->mle_refs));
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
dlm_print_one_mle(struct dlm_master_list_entry * mle)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 */
debug_release(struct inode * inode,struct file * file)350 static int debug_release(struct inode *inode, struct file *file)
351 {
352 free_page((unsigned long)file->private_data);
353 return 0;
354 }
355
debug_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)356 static ssize_t debug_read(struct file *file, char __user *buf,
357 size_t nbytes, loff_t *ppos)
358 {
359 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
360 i_size_read(file->f_mapping->host));
361 }
362 /* end - util funcs */
363
364 /* begin - purge list funcs */
debug_purgelist_print(struct dlm_ctxt * dlm,char * buf,int len)365 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
366 {
367 struct dlm_lock_resource *res;
368 int out = 0;
369 unsigned long total = 0;
370
371 out += snprintf(buf + out, len - out,
372 "Dumping Purgelist for Domain: %s\n", dlm->name);
373
374 spin_lock(&dlm->spinlock);
375 list_for_each_entry(res, &dlm->purge_list, purge) {
376 ++total;
377 if (len - out < 100)
378 continue;
379 spin_lock(&res->spinlock);
380 out += stringify_lockname(res->lockname.name,
381 res->lockname.len,
382 buf + out, len - out);
383 out += snprintf(buf + out, len - out, "\t%ld\n",
384 (jiffies - res->last_used)/HZ);
385 spin_unlock(&res->spinlock);
386 }
387 spin_unlock(&dlm->spinlock);
388
389 out += snprintf(buf + out, len - out, "Total on list: %lu\n", total);
390
391 return out;
392 }
393
debug_purgelist_open(struct inode * inode,struct file * file)394 static int debug_purgelist_open(struct inode *inode, struct file *file)
395 {
396 struct dlm_ctxt *dlm = inode->i_private;
397 char *buf = NULL;
398
399 buf = (char *) get_zeroed_page(GFP_NOFS);
400 if (!buf)
401 goto bail;
402
403 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
404
405 file->private_data = buf;
406
407 return 0;
408 bail:
409 return -ENOMEM;
410 }
411
412 static const struct file_operations debug_purgelist_fops = {
413 .open = debug_purgelist_open,
414 .release = debug_release,
415 .read = debug_read,
416 .llseek = generic_file_llseek,
417 };
418 /* end - purge list funcs */
419
420 /* begin - debug mle funcs */
debug_mle_print(struct dlm_ctxt * dlm,char * buf,int len)421 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
422 {
423 struct dlm_master_list_entry *mle;
424 struct hlist_head *bucket;
425 int i, out = 0;
426 unsigned long total = 0, longest = 0, bucket_count = 0;
427
428 out += snprintf(buf + out, len - out,
429 "Dumping MLEs for Domain: %s\n", dlm->name);
430
431 spin_lock(&dlm->master_lock);
432 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
433 bucket = dlm_master_hash(dlm, i);
434 hlist_for_each_entry(mle, bucket, master_hash_node) {
435 ++total;
436 ++bucket_count;
437 if (len - out < 200)
438 continue;
439 out += dump_mle(mle, buf + out, len - out);
440 }
441 longest = max(longest, bucket_count);
442 bucket_count = 0;
443 }
444 spin_unlock(&dlm->master_lock);
445
446 out += snprintf(buf + out, len - out,
447 "Total: %lu, Longest: %lu\n", total, longest);
448 return out;
449 }
450
debug_mle_open(struct inode * inode,struct file * file)451 static int debug_mle_open(struct inode *inode, struct file *file)
452 {
453 struct dlm_ctxt *dlm = inode->i_private;
454 char *buf = NULL;
455
456 buf = (char *) get_zeroed_page(GFP_NOFS);
457 if (!buf)
458 goto bail;
459
460 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
461
462 file->private_data = buf;
463
464 return 0;
465 bail:
466 return -ENOMEM;
467 }
468
469 static const struct file_operations debug_mle_fops = {
470 .open = debug_mle_open,
471 .release = debug_release,
472 .read = debug_read,
473 .llseek = generic_file_llseek,
474 };
475
476 /* end - debug mle funcs */
477
478 /* begin - debug lockres funcs */
dump_lock(struct dlm_lock * lock,int list_type,char * buf,int len)479 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
480 {
481 int out;
482
483 #define DEBUG_LOCK_VERSION 1
484 spin_lock(&lock->spinlock);
485 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
486 "%d,%d,%d,%d\n",
487 DEBUG_LOCK_VERSION,
488 list_type, lock->ml.type, lock->ml.convert_type,
489 lock->ml.node,
490 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
491 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
492 !list_empty(&lock->ast_list),
493 !list_empty(&lock->bast_list),
494 lock->ast_pending, lock->bast_pending,
495 lock->convert_pending, lock->lock_pending,
496 lock->cancel_pending, lock->unlock_pending,
497 kref_read(&lock->lock_refs));
498 spin_unlock(&lock->spinlock);
499
500 return out;
501 }
502
dump_lockres(struct dlm_lock_resource * res,char * buf,int len)503 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
504 {
505 struct dlm_lock *lock;
506 int i;
507 int out = 0;
508
509 out += snprintf(buf + out, len - out, "NAME:");
510 out += stringify_lockname(res->lockname.name, res->lockname.len,
511 buf + out, len - out);
512 out += snprintf(buf + out, len - out, "\n");
513
514 #define DEBUG_LRES_VERSION 1
515 out += snprintf(buf + out, len - out,
516 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
517 DEBUG_LRES_VERSION,
518 res->owner, res->state, res->last_used,
519 !list_empty(&res->purge),
520 !list_empty(&res->dirty),
521 !list_empty(&res->recovering),
522 res->inflight_locks, res->migration_pending,
523 atomic_read(&res->asts_reserved),
524 kref_read(&res->refs));
525
526 /* refmap */
527 out += snprintf(buf + out, len - out, "RMAP:");
528 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
529 buf + out, len - out);
530 out += snprintf(buf + out, len - out, "\n");
531
532 /* lvb */
533 out += snprintf(buf + out, len - out, "LVBX:");
534 for (i = 0; i < DLM_LVB_LEN; i++)
535 out += snprintf(buf + out, len - out,
536 "%02x", (unsigned char)res->lvb[i]);
537 out += snprintf(buf + out, len - out, "\n");
538
539 /* granted */
540 list_for_each_entry(lock, &res->granted, list)
541 out += dump_lock(lock, 0, buf + out, len - out);
542
543 /* converting */
544 list_for_each_entry(lock, &res->converting, list)
545 out += dump_lock(lock, 1, buf + out, len - out);
546
547 /* blocked */
548 list_for_each_entry(lock, &res->blocked, list)
549 out += dump_lock(lock, 2, buf + out, len - out);
550
551 out += snprintf(buf + out, len - out, "\n");
552
553 return out;
554 }
555
lockres_seq_start(struct seq_file * m,loff_t * pos)556 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
557 {
558 struct debug_lockres *dl = m->private;
559 struct dlm_ctxt *dlm = dl->dl_ctxt;
560 struct dlm_lock_resource *oldres = dl->dl_res;
561 struct dlm_lock_resource *res = NULL;
562 struct list_head *track_list;
563
564 spin_lock(&dlm->track_lock);
565 if (oldres)
566 track_list = &oldres->tracking;
567 else {
568 track_list = &dlm->tracking_list;
569 if (list_empty(track_list)) {
570 dl = NULL;
571 spin_unlock(&dlm->track_lock);
572 goto bail;
573 }
574 }
575
576 list_for_each_entry(res, track_list, tracking) {
577 if (&res->tracking == &dlm->tracking_list)
578 res = NULL;
579 else
580 dlm_lockres_get(res);
581 break;
582 }
583 spin_unlock(&dlm->track_lock);
584
585 if (oldres)
586 dlm_lockres_put(oldres);
587
588 dl->dl_res = res;
589
590 if (res) {
591 spin_lock(&res->spinlock);
592 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
593 spin_unlock(&res->spinlock);
594 } else
595 dl = NULL;
596
597 bail:
598 /* passed to seq_show */
599 return dl;
600 }
601
lockres_seq_stop(struct seq_file * m,void * v)602 static void lockres_seq_stop(struct seq_file *m, void *v)
603 {
604 }
605
lockres_seq_next(struct seq_file * m,void * v,loff_t * pos)606 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
607 {
608 return NULL;
609 }
610
lockres_seq_show(struct seq_file * s,void * v)611 static int lockres_seq_show(struct seq_file *s, void *v)
612 {
613 struct debug_lockres *dl = (struct debug_lockres *)v;
614
615 seq_printf(s, "%s", dl->dl_buf);
616
617 return 0;
618 }
619
620 static const struct seq_operations debug_lockres_ops = {
621 .start = lockres_seq_start,
622 .stop = lockres_seq_stop,
623 .next = lockres_seq_next,
624 .show = lockres_seq_show,
625 };
626
debug_lockres_open(struct inode * inode,struct file * file)627 static int debug_lockres_open(struct inode *inode, struct file *file)
628 {
629 struct dlm_ctxt *dlm = inode->i_private;
630 struct debug_lockres *dl;
631 void *buf;
632
633 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
634 if (!buf)
635 goto bail;
636
637 dl = __seq_open_private(file, &debug_lockres_ops, sizeof(*dl));
638 if (!dl)
639 goto bailfree;
640
641 dl->dl_len = PAGE_SIZE;
642 dl->dl_buf = buf;
643
644 dlm_grab(dlm);
645 dl->dl_ctxt = dlm;
646
647 return 0;
648
649 bailfree:
650 kfree(buf);
651 bail:
652 mlog_errno(-ENOMEM);
653 return -ENOMEM;
654 }
655
debug_lockres_release(struct inode * inode,struct file * file)656 static int debug_lockres_release(struct inode *inode, struct file *file)
657 {
658 struct seq_file *seq = file->private_data;
659 struct debug_lockres *dl = (struct debug_lockres *)seq->private;
660
661 if (dl->dl_res)
662 dlm_lockres_put(dl->dl_res);
663 dlm_put(dl->dl_ctxt);
664 kfree(dl->dl_buf);
665 return seq_release_private(inode, file);
666 }
667
668 static const struct file_operations debug_lockres_fops = {
669 .open = debug_lockres_open,
670 .release = debug_lockres_release,
671 .read = seq_read,
672 .llseek = seq_lseek,
673 };
674 /* end - debug lockres funcs */
675
676 /* begin - debug state funcs */
debug_state_print(struct dlm_ctxt * dlm,char * buf,int len)677 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
678 {
679 int out = 0;
680 struct dlm_reco_node_data *node;
681 char *state;
682 int cur_mles = 0, tot_mles = 0;
683 int i;
684
685 spin_lock(&dlm->spinlock);
686
687 switch (dlm->dlm_state) {
688 case DLM_CTXT_NEW:
689 state = "NEW"; break;
690 case DLM_CTXT_JOINED:
691 state = "JOINED"; break;
692 case DLM_CTXT_IN_SHUTDOWN:
693 state = "SHUTDOWN"; break;
694 case DLM_CTXT_LEAVING:
695 state = "LEAVING"; break;
696 default:
697 state = "UNKNOWN"; break;
698 }
699
700 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */
701 out += snprintf(buf + out, len - out,
702 "Domain: %s Key: 0x%08x Protocol: %d.%d\n",
703 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
704 dlm->dlm_locking_proto.pv_minor);
705
706 /* Thread Pid: xxx Node: xxx State: xxxxx */
707 out += snprintf(buf + out, len - out,
708 "Thread Pid: %d Node: %d State: %s\n",
709 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
710
711 /* Number of Joins: xxx Joining Node: xxx */
712 out += snprintf(buf + out, len - out,
713 "Number of Joins: %d Joining Node: %d\n",
714 dlm->num_joins, dlm->joining_node);
715
716 /* Domain Map: xx xx xx */
717 out += snprintf(buf + out, len - out, "Domain Map: ");
718 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
719 buf + out, len - out);
720 out += snprintf(buf + out, len - out, "\n");
721
722 /* Exit Domain Map: xx xx xx */
723 out += snprintf(buf + out, len - out, "Exit Domain Map: ");
724 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES,
725 buf + out, len - out);
726 out += snprintf(buf + out, len - out, "\n");
727
728 /* Live Map: xx xx xx */
729 out += snprintf(buf + out, len - out, "Live Map: ");
730 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
731 buf + out, len - out);
732 out += snprintf(buf + out, len - out, "\n");
733
734 /* Lock Resources: xxx (xxx) */
735 out += snprintf(buf + out, len - out,
736 "Lock Resources: %d (%d)\n",
737 atomic_read(&dlm->res_cur_count),
738 atomic_read(&dlm->res_tot_count));
739
740 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
741 tot_mles += atomic_read(&dlm->mle_tot_count[i]);
742
743 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
744 cur_mles += atomic_read(&dlm->mle_cur_count[i]);
745
746 /* MLEs: xxx (xxx) */
747 out += snprintf(buf + out, len - out,
748 "MLEs: %d (%d)\n", cur_mles, tot_mles);
749
750 /* Blocking: xxx (xxx) */
751 out += snprintf(buf + out, len - out,
752 " Blocking: %d (%d)\n",
753 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
754 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
755
756 /* Mastery: xxx (xxx) */
757 out += snprintf(buf + out, len - out,
758 " Mastery: %d (%d)\n",
759 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
760 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
761
762 /* Migration: xxx (xxx) */
763 out += snprintf(buf + out, len - out,
764 " Migration: %d (%d)\n",
765 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
766 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
767
768 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
769 out += snprintf(buf + out, len - out,
770 "Lists: Dirty=%s Purge=%s PendingASTs=%s "
771 "PendingBASTs=%s\n",
772 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
773 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
774 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
775 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
776
777 /* Purge Count: xxx Refs: xxx */
778 out += snprintf(buf + out, len - out,
779 "Purge Count: %d Refs: %d\n", dlm->purge_count,
780 kref_read(&dlm->dlm_refs));
781
782 /* Dead Node: xxx */
783 out += snprintf(buf + out, len - out,
784 "Dead Node: %d\n", dlm->reco.dead_node);
785
786 /* What about DLM_RECO_STATE_FINALIZE? */
787 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
788 state = "ACTIVE";
789 else
790 state = "INACTIVE";
791
792 /* Recovery Pid: xxxx Master: xxx State: xxxx */
793 out += snprintf(buf + out, len - out,
794 "Recovery Pid: %d Master: %d State: %s\n",
795 task_pid_nr(dlm->dlm_reco_thread_task),
796 dlm->reco.new_master, state);
797
798 /* Recovery Map: xx xx */
799 out += snprintf(buf + out, len - out, "Recovery Map: ");
800 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
801 buf + out, len - out);
802 out += snprintf(buf + out, len - out, "\n");
803
804 /* Recovery Node State: */
805 out += snprintf(buf + out, len - out, "Recovery Node State:\n");
806 list_for_each_entry(node, &dlm->reco.node_data, list) {
807 switch (node->state) {
808 case DLM_RECO_NODE_DATA_INIT:
809 state = "INIT";
810 break;
811 case DLM_RECO_NODE_DATA_REQUESTING:
812 state = "REQUESTING";
813 break;
814 case DLM_RECO_NODE_DATA_DEAD:
815 state = "DEAD";
816 break;
817 case DLM_RECO_NODE_DATA_RECEIVING:
818 state = "RECEIVING";
819 break;
820 case DLM_RECO_NODE_DATA_REQUESTED:
821 state = "REQUESTED";
822 break;
823 case DLM_RECO_NODE_DATA_DONE:
824 state = "DONE";
825 break;
826 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
827 state = "FINALIZE-SENT";
828 break;
829 default:
830 state = "BAD";
831 break;
832 }
833 out += snprintf(buf + out, len - out, "\t%u - %s\n",
834 node->node_num, state);
835 }
836
837 spin_unlock(&dlm->spinlock);
838
839 return out;
840 }
841
debug_state_open(struct inode * inode,struct file * file)842 static int debug_state_open(struct inode *inode, struct file *file)
843 {
844 struct dlm_ctxt *dlm = inode->i_private;
845 char *buf = NULL;
846
847 buf = (char *) get_zeroed_page(GFP_NOFS);
848 if (!buf)
849 goto bail;
850
851 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
852
853 file->private_data = buf;
854
855 return 0;
856 bail:
857 return -ENOMEM;
858 }
859
860 static const struct file_operations debug_state_fops = {
861 .open = debug_state_open,
862 .release = debug_release,
863 .read = debug_read,
864 .llseek = generic_file_llseek,
865 };
866 /* end - debug state funcs */
867
868 /* files in subroot */
dlm_debug_init(struct dlm_ctxt * dlm)869 int dlm_debug_init(struct dlm_ctxt *dlm)
870 {
871 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
872
873 /* for dumping dlm_ctxt */
874 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
875 S_IFREG|S_IRUSR,
876 dlm->dlm_debugfs_subroot,
877 dlm, &debug_state_fops);
878 if (!dc->debug_state_dentry) {
879 mlog_errno(-ENOMEM);
880 goto bail;
881 }
882
883 /* for dumping lockres */
884 dc->debug_lockres_dentry =
885 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
886 S_IFREG|S_IRUSR,
887 dlm->dlm_debugfs_subroot,
888 dlm, &debug_lockres_fops);
889 if (!dc->debug_lockres_dentry) {
890 mlog_errno(-ENOMEM);
891 goto bail;
892 }
893
894 /* for dumping mles */
895 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
896 S_IFREG|S_IRUSR,
897 dlm->dlm_debugfs_subroot,
898 dlm, &debug_mle_fops);
899 if (!dc->debug_mle_dentry) {
900 mlog_errno(-ENOMEM);
901 goto bail;
902 }
903
904 /* for dumping lockres on the purge list */
905 dc->debug_purgelist_dentry =
906 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
907 S_IFREG|S_IRUSR,
908 dlm->dlm_debugfs_subroot,
909 dlm, &debug_purgelist_fops);
910 if (!dc->debug_purgelist_dentry) {
911 mlog_errno(-ENOMEM);
912 goto bail;
913 }
914
915 return 0;
916
917 bail:
918 return -ENOMEM;
919 }
920
dlm_debug_shutdown(struct dlm_ctxt * dlm)921 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
922 {
923 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
924
925 if (dc) {
926 debugfs_remove(dc->debug_purgelist_dentry);
927 debugfs_remove(dc->debug_mle_dentry);
928 debugfs_remove(dc->debug_lockres_dentry);
929 debugfs_remove(dc->debug_state_dentry);
930 kfree(dc);
931 dc = NULL;
932 }
933 }
934
935 /* subroot - domain dir */
dlm_create_debugfs_subroot(struct dlm_ctxt * dlm)936 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
937 {
938 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
939 dlm_debugfs_root);
940 if (!dlm->dlm_debugfs_subroot) {
941 mlog_errno(-ENOMEM);
942 goto bail;
943 }
944
945 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
946 GFP_KERNEL);
947 if (!dlm->dlm_debug_ctxt) {
948 mlog_errno(-ENOMEM);
949 goto bail;
950 }
951
952 return 0;
953 bail:
954 dlm_destroy_debugfs_subroot(dlm);
955 return -ENOMEM;
956 }
957
dlm_destroy_debugfs_subroot(struct dlm_ctxt * dlm)958 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
959 {
960 debugfs_remove(dlm->dlm_debugfs_subroot);
961 }
962
963 /* debugfs root */
dlm_create_debugfs_root(void)964 int dlm_create_debugfs_root(void)
965 {
966 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
967 if (!dlm_debugfs_root) {
968 mlog_errno(-ENOMEM);
969 return -ENOMEM;
970 }
971 return 0;
972 }
973
dlm_destroy_debugfs_root(void)974 void dlm_destroy_debugfs_root(void)
975 {
976 debugfs_remove(dlm_debugfs_root);
977 }
978 #endif /* CONFIG_DEBUG_FS */
979
