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ext4: Optimize ext4 DIO overwrites
[linux/fpc-iii.git] / fs / ocfs2 / dlm / dlmdebug.c
blob4d0b452012b252f4bc3be3eb222b997fb6f50556
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * dlmdebug.c
6 *
7 * debug functionality for the dlm
8 *
9 * Copyright (C) 2004, 2008 Oracle. All rights reserved.
10 */
11
12 #include <linux/types.h>
13 #include <linux/slab.h>
14 #include <linux/highmem.h>
15 #include <linux/sysctl.h>
16 #include <linux/spinlock.h>
17 #include <linux/debugfs.h>
18 #include <linux/export.h>
19
20 #include "cluster/heartbeat.h"
21 #include "cluster/nodemanager.h"
22 #include "cluster/tcp.h"
23
24 #include "dlmapi.h"
25 #include "dlmcommon.h"
26 #include "dlmdomain.h"
27 #include "dlmdebug.h"
28
29 #define MLOG_MASK_PREFIX ML_DLM
30 #include "cluster/masklog.h"
31
32 static int stringify_lockname(const char *lockname, int locklen, char *buf,
33 int len);
34
35 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
36 {
37 spin_lock(&res->spinlock);
38 __dlm_print_one_lock_resource(res);
39 spin_unlock(&res->spinlock);
40 }
41
42 static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
43 {
44 int bit;
45 assert_spin_locked(&res->spinlock);
46
47 printk(" refmap nodes: [ ");
48 bit = 0;
49 while (1) {
50 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
51 if (bit >= O2NM_MAX_NODES)
52 break;
53 printk("%u ", bit);
54 bit++;
55 }
56 printk("], inflight=%u\n", res->inflight_locks);
57 }
58
59 static void __dlm_print_lock(struct dlm_lock *lock)
60 {
61 spin_lock(&lock->spinlock);
62
63 printk(" type=%d, conv=%d, node=%u, cookie=%u:%llu, "
64 "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), "
65 "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n",
66 lock->ml.type, lock->ml.convert_type, lock->ml.node,
67 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
68 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
69 kref_read(&lock->lock_refs),
70 (list_empty(&lock->ast_list) ? 'y' : 'n'),
71 (lock->ast_pending ? 'y' : 'n'),
72 (list_empty(&lock->bast_list) ? 'y' : 'n'),
73 (lock->bast_pending ? 'y' : 'n'),
74 (lock->convert_pending ? 'y' : 'n'),
75 (lock->lock_pending ? 'y' : 'n'),
76 (lock->cancel_pending ? 'y' : 'n'),
77 (lock->unlock_pending ? 'y' : 'n'));
78
79 spin_unlock(&lock->spinlock);
80 }
81
82 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
83 {
84 struct dlm_lock *lock;
85 char buf[DLM_LOCKID_NAME_MAX];
86
87 assert_spin_locked(&res->spinlock);
88
89 stringify_lockname(res->lockname.name, res->lockname.len,
90 buf, sizeof(buf));
91 printk("lockres: %s, owner=%u, state=%u\n",
92 buf, res->owner, res->state);
93 printk(" last used: %lu, refcnt: %u, on purge list: %s\n",
94 res->last_used, kref_read(&res->refs),
95 list_empty(&res->purge) ? "no" : "yes");
96 printk(" on dirty list: %s, on reco list: %s, "
97 "migrating pending: %s\n",
98 list_empty(&res->dirty) ? "no" : "yes",
99 list_empty(&res->recovering) ? "no" : "yes",
100 res->migration_pending ? "yes" : "no");
101 printk(" inflight locks: %d, asts reserved: %d\n",
102 res->inflight_locks, atomic_read(&res->asts_reserved));
103 dlm_print_lockres_refmap(res);
104 printk(" granted queue:\n");
105 list_for_each_entry(lock, &res->granted, list) {
106 __dlm_print_lock(lock);
107 }
108 printk(" converting queue:\n");
109 list_for_each_entry(lock, &res->converting, list) {
110 __dlm_print_lock(lock);
111 }
112 printk(" blocked queue:\n");
113 list_for_each_entry(lock, &res->blocked, list) {
114 __dlm_print_lock(lock);
115 }
116 }
117
118 void dlm_print_one_lock(struct dlm_lock *lockid)
119 {
120 dlm_print_one_lock_resource(lockid->lockres);
121 }
122 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
123
124 static const char *dlm_errnames[] = {
125 [DLM_NORMAL] = "DLM_NORMAL",
126 [DLM_GRANTED] = "DLM_GRANTED",
127 [DLM_DENIED] = "DLM_DENIED",
128 [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS",
129 [DLM_WORKING] = "DLM_WORKING",
130 [DLM_BLOCKED] = "DLM_BLOCKED",
131 [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN",
132 [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD",
133 [DLM_SYSERR] = "DLM_SYSERR",
134 [DLM_NOSUPPORT] = "DLM_NOSUPPORT",
135 [DLM_CANCELGRANT] = "DLM_CANCELGRANT",
136 [DLM_IVLOCKID] = "DLM_IVLOCKID",
137 [DLM_SYNC] = "DLM_SYNC",
138 [DLM_BADTYPE] = "DLM_BADTYPE",
139 [DLM_BADRESOURCE] = "DLM_BADRESOURCE",
140 [DLM_MAXHANDLES] = "DLM_MAXHANDLES",
141 [DLM_NOCLINFO] = "DLM_NOCLINFO",
142 [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR",
143 [DLM_NOPURGED] = "DLM_NOPURGED",
144 [DLM_BADARGS] = "DLM_BADARGS",
145 [DLM_VOID] = "DLM_VOID",
146 [DLM_NOTQUEUED] = "DLM_NOTQUEUED",
147 [DLM_IVBUFLEN] = "DLM_IVBUFLEN",
148 [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT",
149 [DLM_BADPARAM] = "DLM_BADPARAM",
150 [DLM_VALNOTVALID] = "DLM_VALNOTVALID",
151 [DLM_REJECTED] = "DLM_REJECTED",
152 [DLM_ABORT] = "DLM_ABORT",
153 [DLM_CANCEL] = "DLM_CANCEL",
154 [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE",
155 [DLM_DEADLOCK] = "DLM_DEADLOCK",
156 [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS",
157 [DLM_FORWARD] = "DLM_FORWARD",
158 [DLM_TIMEOUT] = "DLM_TIMEOUT",
159 [DLM_IVGROUPID] = "DLM_IVGROUPID",
160 [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT",
161 [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH",
162 [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION",
163 [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ",
164 [DLM_RECOVERING] = "DLM_RECOVERING",
165 [DLM_MIGRATING] = "DLM_MIGRATING",
166 [DLM_MAXSTATS] = "DLM_MAXSTATS",
167 };
168
169 static const char *dlm_errmsgs[] = {
170 [DLM_NORMAL] = "request in progress",
171 [DLM_GRANTED] = "request granted",
172 [DLM_DENIED] = "request denied",
173 [DLM_DENIED_NOLOCKS] = "request denied, out of system resources",
174 [DLM_WORKING] = "async request in progress",
175 [DLM_BLOCKED] = "lock request blocked",
176 [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock",
177 [DLM_DENIED_GRACE_PERIOD] = "topological change in progress",
178 [DLM_SYSERR] = "system error",
179 [DLM_NOSUPPORT] = "unsupported",
180 [DLM_CANCELGRANT] = "can't cancel convert: already granted",
181 [DLM_IVLOCKID] = "bad lockid",
182 [DLM_SYNC] = "synchronous request granted",
183 [DLM_BADTYPE] = "bad resource type",
184 [DLM_BADRESOURCE] = "bad resource handle",
185 [DLM_MAXHANDLES] = "no more resource handles",
186 [DLM_NOCLINFO] = "can't contact cluster manager",
187 [DLM_NOLOCKMGR] = "can't contact lock manager",
188 [DLM_NOPURGED] = "can't contact purge daemon",
189 [DLM_BADARGS] = "bad api args",
190 [DLM_VOID] = "no status",
191 [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed",
192 [DLM_IVBUFLEN] = "invalid resource name length",
193 [DLM_CVTUNGRANT] = "attempted to convert ungranted lock",
194 [DLM_BADPARAM] = "invalid lock mode specified",
195 [DLM_VALNOTVALID] = "value block has been invalidated",
196 [DLM_REJECTED] = "request rejected, unrecognized client",
197 [DLM_ABORT] = "blocked lock request cancelled",
198 [DLM_CANCEL] = "conversion request cancelled",
199 [DLM_IVRESHANDLE] = "invalid resource handle",
200 [DLM_DEADLOCK] = "deadlock recovery refused this request",
201 [DLM_DENIED_NOASTS] = "failed to allocate AST",
202 [DLM_FORWARD] = "request must wait for primary's response",
203 [DLM_TIMEOUT] = "timeout value for lock has expired",
204 [DLM_IVGROUPID] = "invalid group specification",
205 [DLM_VERS_CONFLICT] = "version conflicts prevent request handling",
206 [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong",
207 [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device",
208 [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ",
209 [DLM_RECOVERING] = "lock resource being recovered",
210 [DLM_MIGRATING] = "lock resource being migrated",
211 [DLM_MAXSTATS] = "invalid error number",
212 };
213
214 const char *dlm_errmsg(enum dlm_status err)
215 {
216 if (err >= DLM_MAXSTATS || err < 0)
217 return dlm_errmsgs[DLM_MAXSTATS];
218 return dlm_errmsgs[err];
219 }
220 EXPORT_SYMBOL_GPL(dlm_errmsg);
221
222 const char *dlm_errname(enum dlm_status err)
223 {
224 if (err >= DLM_MAXSTATS || err < 0)
225 return dlm_errnames[DLM_MAXSTATS];
226 return dlm_errnames[err];
227 }
228 EXPORT_SYMBOL_GPL(dlm_errname);
229
230 /* NOTE: This function converts a lockname into a string. It uses knowledge
231 * of the format of the lockname that should be outside the purview of the dlm.
232 * We are adding only to make dlm debugging slightly easier.
233 *
234 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
235 */
236 static int stringify_lockname(const char *lockname, int locklen, char *buf,
237 int len)
238 {
239 int out = 0;
240 __be64 inode_blkno_be;
241
242 #define OCFS2_DENTRY_LOCK_INO_START 18
243 if (*lockname == 'N') {
244 memcpy((__be64 *)&inode_blkno_be,
245 (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
246 sizeof(__be64));
247 out += snprintf(buf + out, len - out, "%.*s%08x",
248 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
249 (unsigned int)be64_to_cpu(inode_blkno_be));
250 } else
251 out += snprintf(buf + out, len - out, "%.*s",
252 locklen, lockname);
253 return out;
254 }
255
256 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
257 char *buf, int len)
258 {
259 int out = 0;
260 int i = -1;
261
262 while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
263 out += snprintf(buf + out, len - out, "%d ", i);
264
265 return out;
266 }
267
268 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
269 {
270 int out = 0;
271 char *mle_type;
272
273 if (mle->type == DLM_MLE_BLOCK)
274 mle_type = "BLK";
275 else if (mle->type == DLM_MLE_MASTER)
276 mle_type = "MAS";
277 else
278 mle_type = "MIG";
279
280 out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
281 out += snprintf(buf + out, len - out,
282 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
283 mle_type, mle->master, mle->new_master,
284 !list_empty(&mle->hb_events),
285 !!mle->inuse,
286 kref_read(&mle->mle_refs));
287
288 out += snprintf(buf + out, len - out, "Maybe=");
289 out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
290 buf + out, len - out);
291 out += snprintf(buf + out, len - out, "\n");
292
293 out += snprintf(buf + out, len - out, "Vote=");
294 out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
295 buf + out, len - out);
296 out += snprintf(buf + out, len - out, "\n");
297
298 out += snprintf(buf + out, len - out, "Response=");
299 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
300 buf + out, len - out);
301 out += snprintf(buf + out, len - out, "\n");
302
303 out += snprintf(buf + out, len - out, "Node=");
304 out += stringify_nodemap(mle->node_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, "\n");
309
310 return out;
311 }
312
313 void dlm_print_one_mle(struct dlm_master_list_entry *mle)
314 {
315 char *buf;
316
317 buf = (char *) get_zeroed_page(GFP_ATOMIC);
318 if (buf) {
319 dump_mle(mle, buf, PAGE_SIZE - 1);
320 free_page((unsigned long)buf);
321 }
322 }
323
324 #ifdef CONFIG_DEBUG_FS
325
326 static struct dentry *dlm_debugfs_root;
327
328 #define DLM_DEBUGFS_DIR "o2dlm"
329 #define DLM_DEBUGFS_DLM_STATE "dlm_state"
330 #define DLM_DEBUGFS_LOCKING_STATE "locking_state"
331 #define DLM_DEBUGFS_MLE_STATE "mle_state"
332 #define DLM_DEBUGFS_PURGE_LIST "purge_list"
333
334 /* begin - utils funcs */
335 static int debug_release(struct inode *inode, struct file *file)
336 {
337 free_page((unsigned long)file->private_data);
338 return 0;
339 }
340
341 static ssize_t debug_read(struct file *file, char __user *buf,
342 size_t nbytes, loff_t *ppos)
343 {
344 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
345 i_size_read(file->f_mapping->host));
346 }
347 /* end - util funcs */
348
349 /* begin - purge list funcs */
350 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
351 {
352 struct dlm_lock_resource *res;
353 int out = 0;
354 unsigned long total = 0;
355
356 out += snprintf(buf + out, len - out,
357 "Dumping Purgelist for Domain: %s\n", dlm->name);
358
359 spin_lock(&dlm->spinlock);
360 list_for_each_entry(res, &dlm->purge_list, purge) {
361 ++total;
362 if (len - out < 100)
363 continue;
364 spin_lock(&res->spinlock);
365 out += stringify_lockname(res->lockname.name,
366 res->lockname.len,
367 buf + out, len - out);
368 out += snprintf(buf + out, len - out, "\t%ld\n",
369 (jiffies - res->last_used)/HZ);
370 spin_unlock(&res->spinlock);
371 }
372 spin_unlock(&dlm->spinlock);
373
374 out += snprintf(buf + out, len - out, "Total on list: %lu\n", total);
375
376 return out;
377 }
378
379 static int debug_purgelist_open(struct inode *inode, struct file *file)
380 {
381 struct dlm_ctxt *dlm = inode->i_private;
382 char *buf = NULL;
383
384 buf = (char *) get_zeroed_page(GFP_NOFS);
385 if (!buf)
386 goto bail;
387
388 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
389
390 file->private_data = buf;
391
392 return 0;
393 bail:
394 return -ENOMEM;
395 }
396
397 static const struct file_operations debug_purgelist_fops = {
398 .open = debug_purgelist_open,
399 .release = debug_release,
400 .read = debug_read,
401 .llseek = generic_file_llseek,
402 };
403 /* end - purge list funcs */
404
405 /* begin - debug mle funcs */
406 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
407 {
408 struct dlm_master_list_entry *mle;
409 struct hlist_head *bucket;
410 int i, out = 0;
411 unsigned long total = 0, longest = 0, bucket_count = 0;
412
413 out += snprintf(buf + out, len - out,
414 "Dumping MLEs for Domain: %s\n", dlm->name);
415
416 spin_lock(&dlm->master_lock);
417 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
418 bucket = dlm_master_hash(dlm, i);
419 hlist_for_each_entry(mle, bucket, master_hash_node) {
420 ++total;
421 ++bucket_count;
422 if (len - out < 200)
423 continue;
424 out += dump_mle(mle, buf + out, len - out);
425 }
426 longest = max(longest, bucket_count);
427 bucket_count = 0;
428 }
429 spin_unlock(&dlm->master_lock);
430
431 out += snprintf(buf + out, len - out,
432 "Total: %lu, Longest: %lu\n", total, longest);
433 return out;
434 }
435
436 static int debug_mle_open(struct inode *inode, struct file *file)
437 {
438 struct dlm_ctxt *dlm = inode->i_private;
439 char *buf = NULL;
440
441 buf = (char *) get_zeroed_page(GFP_NOFS);
442 if (!buf)
443 goto bail;
444
445 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
446
447 file->private_data = buf;
448
449 return 0;
450 bail:
451 return -ENOMEM;
452 }
453
454 static const struct file_operations debug_mle_fops = {
455 .open = debug_mle_open,
456 .release = debug_release,
457 .read = debug_read,
458 .llseek = generic_file_llseek,
459 };
460
461 /* end - debug mle funcs */
462
463 /* begin - debug lockres funcs */
464 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
465 {
466 int out;
467
468 #define DEBUG_LOCK_VERSION 1
469 spin_lock(&lock->spinlock);
470 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
471 "%d,%d,%d,%d\n",
472 DEBUG_LOCK_VERSION,
473 list_type, lock->ml.type, lock->ml.convert_type,
474 lock->ml.node,
475 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
476 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
477 !list_empty(&lock->ast_list),
478 !list_empty(&lock->bast_list),
479 lock->ast_pending, lock->bast_pending,
480 lock->convert_pending, lock->lock_pending,
481 lock->cancel_pending, lock->unlock_pending,
482 kref_read(&lock->lock_refs));
483 spin_unlock(&lock->spinlock);
484
485 return out;
486 }
487
488 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
489 {
490 struct dlm_lock *lock;
491 int i;
492 int out = 0;
493
494 out += snprintf(buf + out, len - out, "NAME:");
495 out += stringify_lockname(res->lockname.name, res->lockname.len,
496 buf + out, len - out);
497 out += snprintf(buf + out, len - out, "\n");
498
499 #define DEBUG_LRES_VERSION 1
500 out += snprintf(buf + out, len - out,
501 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
502 DEBUG_LRES_VERSION,
503 res->owner, res->state, res->last_used,
504 !list_empty(&res->purge),
505 !list_empty(&res->dirty),
506 !list_empty(&res->recovering),
507 res->inflight_locks, res->migration_pending,
508 atomic_read(&res->asts_reserved),
509 kref_read(&res->refs));
510
511 /* refmap */
512 out += snprintf(buf + out, len - out, "RMAP:");
513 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
514 buf + out, len - out);
515 out += snprintf(buf + out, len - out, "\n");
516
517 /* lvb */
518 out += snprintf(buf + out, len - out, "LVBX:");
519 for (i = 0; i < DLM_LVB_LEN; i++)
520 out += snprintf(buf + out, len - out,
521 "%02x", (unsigned char)res->lvb[i]);
522 out += snprintf(buf + out, len - out, "\n");
523
524 /* granted */
525 list_for_each_entry(lock, &res->granted, list)
526 out += dump_lock(lock, 0, buf + out, len - out);
527
528 /* converting */
529 list_for_each_entry(lock, &res->converting, list)
530 out += dump_lock(lock, 1, buf + out, len - out);
531
532 /* blocked */
533 list_for_each_entry(lock, &res->blocked, list)
534 out += dump_lock(lock, 2, buf + out, len - out);
535
536 out += snprintf(buf + out, len - out, "\n");
537
538 return out;
539 }
540
541 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
542 {
543 struct debug_lockres *dl = m->private;
544 struct dlm_ctxt *dlm = dl->dl_ctxt;
545 struct dlm_lock_resource *oldres = dl->dl_res;
546 struct dlm_lock_resource *res = NULL;
547 struct list_head *track_list;
548
549 spin_lock(&dlm->track_lock);
550 if (oldres)
551 track_list = &oldres->tracking;
552 else {
553 track_list = &dlm->tracking_list;
554 if (list_empty(track_list)) {
555 dl = NULL;
556 spin_unlock(&dlm->track_lock);
557 goto bail;
558 }
559 }
560
561 list_for_each_entry(res, track_list, tracking) {
562 if (&res->tracking == &dlm->tracking_list)
563 res = NULL;
564 else
565 dlm_lockres_get(res);
566 break;
567 }
568 spin_unlock(&dlm->track_lock);
569
570 if (oldres)
571 dlm_lockres_put(oldres);
572
573 dl->dl_res = res;
574
575 if (res) {
576 spin_lock(&res->spinlock);
577 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
578 spin_unlock(&res->spinlock);
579 } else
580 dl = NULL;
581
582 bail:
583 /* passed to seq_show */
584 return dl;
585 }
586
587 static void lockres_seq_stop(struct seq_file *m, void *v)
588 {
589 }
590
591 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
592 {
593 return NULL;
594 }
595
596 static int lockres_seq_show(struct seq_file *s, void *v)
597 {
598 struct debug_lockres *dl = (struct debug_lockres *)v;
599
600 seq_printf(s, "%s", dl->dl_buf);
601
602 return 0;
603 }
604
605 static const struct seq_operations debug_lockres_ops = {
606 .start = lockres_seq_start,
607 .stop = lockres_seq_stop,
608 .next = lockres_seq_next,
609 .show = lockres_seq_show,
610 };
611
612 static int debug_lockres_open(struct inode *inode, struct file *file)
613 {
614 struct dlm_ctxt *dlm = inode->i_private;
615 struct debug_lockres *dl;
616 void *buf;
617
618 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
619 if (!buf)
620 goto bail;
621
622 dl = __seq_open_private(file, &debug_lockres_ops, sizeof(*dl));
623 if (!dl)
624 goto bailfree;
625
626 dl->dl_len = PAGE_SIZE;
627 dl->dl_buf = buf;
628
629 dlm_grab(dlm);
630 dl->dl_ctxt = dlm;
631
632 return 0;
633
634 bailfree:
635 kfree(buf);
636 bail:
637 mlog_errno(-ENOMEM);
638 return -ENOMEM;
639 }
640
641 static int debug_lockres_release(struct inode *inode, struct file *file)
642 {
643 struct seq_file *seq = file->private_data;
644 struct debug_lockres *dl = (struct debug_lockres *)seq->private;
645
646 if (dl->dl_res)
647 dlm_lockres_put(dl->dl_res);
648 dlm_put(dl->dl_ctxt);
649 kfree(dl->dl_buf);
650 return seq_release_private(inode, file);
651 }
652
653 static const struct file_operations debug_lockres_fops = {
654 .open = debug_lockres_open,
655 .release = debug_lockres_release,
656 .read = seq_read,
657 .llseek = seq_lseek,
658 };
659 /* end - debug lockres funcs */
660
661 /* begin - debug state funcs */
662 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
663 {
664 int out = 0;
665 struct dlm_reco_node_data *node;
666 char *state;
667 int cur_mles = 0, tot_mles = 0;
668 int i;
669
670 spin_lock(&dlm->spinlock);
671
672 switch (dlm->dlm_state) {
673 case DLM_CTXT_NEW:
674 state = "NEW"; break;
675 case DLM_CTXT_JOINED:
676 state = "JOINED"; break;
677 case DLM_CTXT_IN_SHUTDOWN:
678 state = "SHUTDOWN"; break;
679 case DLM_CTXT_LEAVING:
680 state = "LEAVING"; break;
681 default:
682 state = "UNKNOWN"; break;
683 }
684
685 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */
686 out += snprintf(buf + out, len - out,
687 "Domain: %s Key: 0x%08x Protocol: %d.%d\n",
688 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
689 dlm->dlm_locking_proto.pv_minor);
690
691 /* Thread Pid: xxx Node: xxx State: xxxxx */
692 out += snprintf(buf + out, len - out,
693 "Thread Pid: %d Node: %d State: %s\n",
694 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
695
696 /* Number of Joins: xxx Joining Node: xxx */
697 out += snprintf(buf + out, len - out,
698 "Number of Joins: %d Joining Node: %d\n",
699 dlm->num_joins, dlm->joining_node);
700
701 /* Domain Map: xx xx xx */
702 out += snprintf(buf + out, len - out, "Domain Map: ");
703 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
704 buf + out, len - out);
705 out += snprintf(buf + out, len - out, "\n");
706
707 /* Exit Domain Map: xx xx xx */
708 out += snprintf(buf + out, len - out, "Exit Domain Map: ");
709 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES,
710 buf + out, len - out);
711 out += snprintf(buf + out, len - out, "\n");
712
713 /* Live Map: xx xx xx */
714 out += snprintf(buf + out, len - out, "Live Map: ");
715 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
716 buf + out, len - out);
717 out += snprintf(buf + out, len - out, "\n");
718
719 /* Lock Resources: xxx (xxx) */
720 out += snprintf(buf + out, len - out,
721 "Lock Resources: %d (%d)\n",
722 atomic_read(&dlm->res_cur_count),
723 atomic_read(&dlm->res_tot_count));
724
725 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
726 tot_mles += atomic_read(&dlm->mle_tot_count[i]);
727
728 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
729 cur_mles += atomic_read(&dlm->mle_cur_count[i]);
730
731 /* MLEs: xxx (xxx) */
732 out += snprintf(buf + out, len - out,
733 "MLEs: %d (%d)\n", cur_mles, tot_mles);
734
735 /* Blocking: xxx (xxx) */
736 out += snprintf(buf + out, len - out,
737 " Blocking: %d (%d)\n",
738 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
739 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
740
741 /* Mastery: xxx (xxx) */
742 out += snprintf(buf + out, len - out,
743 " Mastery: %d (%d)\n",
744 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
745 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
746
747 /* Migration: xxx (xxx) */
748 out += snprintf(buf + out, len - out,
749 " Migration: %d (%d)\n",
750 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
751 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
752
753 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
754 out += snprintf(buf + out, len - out,
755 "Lists: Dirty=%s Purge=%s PendingASTs=%s "
756 "PendingBASTs=%s\n",
757 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
758 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
759 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
760 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
761
762 /* Purge Count: xxx Refs: xxx */
763 out += snprintf(buf + out, len - out,
764 "Purge Count: %d Refs: %d\n", dlm->purge_count,
765 kref_read(&dlm->dlm_refs));
766
767 /* Dead Node: xxx */
768 out += snprintf(buf + out, len - out,
769 "Dead Node: %d\n", dlm->reco.dead_node);
770
771 /* What about DLM_RECO_STATE_FINALIZE? */
772 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
773 state = "ACTIVE";
774 else
775 state = "INACTIVE";
776
777 /* Recovery Pid: xxxx Master: xxx State: xxxx */
778 out += snprintf(buf + out, len - out,
779 "Recovery Pid: %d Master: %d State: %s\n",
780 task_pid_nr(dlm->dlm_reco_thread_task),
781 dlm->reco.new_master, state);
782
783 /* Recovery Map: xx xx */
784 out += snprintf(buf + out, len - out, "Recovery Map: ");
785 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
786 buf + out, len - out);
787 out += snprintf(buf + out, len - out, "\n");
788
789 /* Recovery Node State: */
790 out += snprintf(buf + out, len - out, "Recovery Node State:\n");
791 list_for_each_entry(node, &dlm->reco.node_data, list) {
792 switch (node->state) {
793 case DLM_RECO_NODE_DATA_INIT:
794 state = "INIT";
795 break;
796 case DLM_RECO_NODE_DATA_REQUESTING:
797 state = "REQUESTING";
798 break;
799 case DLM_RECO_NODE_DATA_DEAD:
800 state = "DEAD";
801 break;
802 case DLM_RECO_NODE_DATA_RECEIVING:
803 state = "RECEIVING";
804 break;
805 case DLM_RECO_NODE_DATA_REQUESTED:
806 state = "REQUESTED";
807 break;
808 case DLM_RECO_NODE_DATA_DONE:
809 state = "DONE";
810 break;
811 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
812 state = "FINALIZE-SENT";
813 break;
814 default:
815 state = "BAD";
816 break;
817 }
818 out += snprintf(buf + out, len - out, "\t%u - %s\n",
819 node->node_num, state);
820 }
821
822 spin_unlock(&dlm->spinlock);
823
824 return out;
825 }
826
827 static int debug_state_open(struct inode *inode, struct file *file)
828 {
829 struct dlm_ctxt *dlm = inode->i_private;
830 char *buf = NULL;
831
832 buf = (char *) get_zeroed_page(GFP_NOFS);
833 if (!buf)
834 goto bail;
835
836 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
837
838 file->private_data = buf;
839
840 return 0;
841 bail:
842 return -ENOMEM;
843 }
844
845 static const struct file_operations debug_state_fops = {
846 .open = debug_state_open,
847 .release = debug_release,
848 .read = debug_read,
849 .llseek = generic_file_llseek,
850 };
851 /* end - debug state funcs */
852
853 /* files in subroot */
854 void dlm_debug_init(struct dlm_ctxt *dlm)
855 {
856 /* for dumping dlm_ctxt */
857 debugfs_create_file(DLM_DEBUGFS_DLM_STATE, S_IFREG|S_IRUSR,
858 dlm->dlm_debugfs_subroot, dlm, &debug_state_fops);
859
860 /* for dumping lockres */
861 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE, S_IFREG|S_IRUSR,
862 dlm->dlm_debugfs_subroot, dlm, &debug_lockres_fops);
863
864 /* for dumping mles */
865 debugfs_create_file(DLM_DEBUGFS_MLE_STATE, S_IFREG|S_IRUSR,
866 dlm->dlm_debugfs_subroot, dlm, &debug_mle_fops);
867
868 /* for dumping lockres on the purge list */
869 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST, S_IFREG|S_IRUSR,
870 dlm->dlm_debugfs_subroot, dlm,
871 &debug_purgelist_fops);
872 }
873
874 /* subroot - domain dir */
875 void dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
876 {
877 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
878 dlm_debugfs_root);
879 }
880
881 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
882 {
883 debugfs_remove_recursive(dlm->dlm_debugfs_subroot);
884 }
885
886 /* debugfs root */
887 void dlm_create_debugfs_root(void)
888 {
889 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
890 }
891
892 void dlm_destroy_debugfs_root(void)
893 {
894 debugfs_remove(dlm_debugfs_root);
895 }
896 #endif /* CONFIG_DEBUG_FS */
Linux with added FPC-III support