ocfs2/dlm: Fix race in adding/removing lockres' to/from the tracking list
[linux-2.6.git] / fs / ocfs2 / dlm / dlmdebug.c
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
50 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
51 {
52         spin_lock(&res->spinlock);
53         __dlm_print_one_lock_resource(res);
54         spin_unlock(&res->spinlock);
55 }
56
57 static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
58 {
59         int bit;
60         assert_spin_locked(&res->spinlock);
61
62         printk("  refmap nodes: [ ");
63         bit = 0;
64         while (1) {
65                 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
66                 if (bit >= O2NM_MAX_NODES)
67                         break;
68                 printk("%u ", bit);
69                 bit++;
70         }
71         printk("], inflight=%u\n", res->inflight_locks);
72 }
73
74 static void __dlm_print_lock(struct dlm_lock *lock)
75 {
76         spin_lock(&lock->spinlock);
77
78         printk("    type=%d, conv=%d, node=%u, cookie=%u:%llu, "
79                "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), "
80                "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n",
81                lock->ml.type, lock->ml.convert_type, lock->ml.node,
82                dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
83                dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
84                atomic_read(&lock->lock_refs.refcount),
85                (list_empty(&lock->ast_list) ? 'y' : 'n'),
86                (lock->ast_pending ? 'y' : 'n'),
87                (list_empty(&lock->bast_list) ? 'y' : 'n'),
88                (lock->bast_pending ? 'y' : 'n'),
89                (lock->convert_pending ? 'y' : 'n'),
90                (lock->lock_pending ? 'y' : 'n'),
91                (lock->cancel_pending ? 'y' : 'n'),
92                (lock->unlock_pending ? 'y' : 'n'));
93
94         spin_unlock(&lock->spinlock);
95 }
96
97 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
98 {
99         struct list_head *iter2;
100         struct dlm_lock *lock;
101         char buf[DLM_LOCKID_NAME_MAX];
102
103         assert_spin_locked(&res->spinlock);
104
105         stringify_lockname(res->lockname.name, res->lockname.len,
106                            buf, sizeof(buf) - 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
137 void dlm_print_one_lock(struct dlm_lock *lockid)
138 {
139         dlm_print_one_lock_resource(lockid->lockres);
140 }
141 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
142
143 static const char *dlm_errnames[] = {
144         [DLM_NORMAL] =                  "DLM_NORMAL",
145         [DLM_GRANTED] =                 "DLM_GRANTED",
146         [DLM_DENIED] =                  "DLM_DENIED",
147         [DLM_DENIED_NOLOCKS] =          "DLM_DENIED_NOLOCKS",
148         [DLM_WORKING] =                 "DLM_WORKING",
149         [DLM_BLOCKED] =                 "DLM_BLOCKED",
150         [DLM_BLOCKED_ORPHAN] =          "DLM_BLOCKED_ORPHAN",
151         [DLM_DENIED_GRACE_PERIOD] =     "DLM_DENIED_GRACE_PERIOD",
152         [DLM_SYSERR] =                  "DLM_SYSERR",
153         [DLM_NOSUPPORT] =               "DLM_NOSUPPORT",
154         [DLM_CANCELGRANT] =             "DLM_CANCELGRANT",
155         [DLM_IVLOCKID] =                "DLM_IVLOCKID",
156         [DLM_SYNC] =                    "DLM_SYNC",
157         [DLM_BADTYPE] =                 "DLM_BADTYPE",
158         [DLM_BADRESOURCE] =             "DLM_BADRESOURCE",
159         [DLM_MAXHANDLES] =              "DLM_MAXHANDLES",
160         [DLM_NOCLINFO] =                "DLM_NOCLINFO",
161         [DLM_NOLOCKMGR] =               "DLM_NOLOCKMGR",
162         [DLM_NOPURGED] =                "DLM_NOPURGED",
163         [DLM_BADARGS] =                 "DLM_BADARGS",
164         [DLM_VOID] =                    "DLM_VOID",
165         [DLM_NOTQUEUED] =               "DLM_NOTQUEUED",
166         [DLM_IVBUFLEN] =                "DLM_IVBUFLEN",
167         [DLM_CVTUNGRANT] =              "DLM_CVTUNGRANT",
168         [DLM_BADPARAM] =                "DLM_BADPARAM",
169         [DLM_VALNOTVALID] =             "DLM_VALNOTVALID",
170         [DLM_REJECTED] =                "DLM_REJECTED",
171         [DLM_ABORT] =                   "DLM_ABORT",
172         [DLM_CANCEL] =                  "DLM_CANCEL",
173         [DLM_IVRESHANDLE] =             "DLM_IVRESHANDLE",
174         [DLM_DEADLOCK] =                "DLM_DEADLOCK",
175         [DLM_DENIED_NOASTS] =           "DLM_DENIED_NOASTS",
176         [DLM_FORWARD] =                 "DLM_FORWARD",
177         [DLM_TIMEOUT] =                 "DLM_TIMEOUT",
178         [DLM_IVGROUPID] =               "DLM_IVGROUPID",
179         [DLM_VERS_CONFLICT] =           "DLM_VERS_CONFLICT",
180         [DLM_BAD_DEVICE_PATH] =         "DLM_BAD_DEVICE_PATH",
181         [DLM_NO_DEVICE_PERMISSION] =    "DLM_NO_DEVICE_PERMISSION",
182         [DLM_NO_CONTROL_DEVICE ] =      "DLM_NO_CONTROL_DEVICE ",
183         [DLM_RECOVERING] =              "DLM_RECOVERING",
184         [DLM_MIGRATING] =               "DLM_MIGRATING",
185         [DLM_MAXSTATS] =                "DLM_MAXSTATS",
186 };
187
188 static const char *dlm_errmsgs[] = {
189         [DLM_NORMAL] =                  "request in progress",
190         [DLM_GRANTED] =                 "request granted",
191         [DLM_DENIED] =                  "request denied",
192         [DLM_DENIED_NOLOCKS] =          "request denied, out of system resources",
193         [DLM_WORKING] =                 "async request in progress",
194         [DLM_BLOCKED] =                 "lock request blocked",
195         [DLM_BLOCKED_ORPHAN] =          "lock request blocked by a orphan lock",
196         [DLM_DENIED_GRACE_PERIOD] =     "topological change in progress",
197         [DLM_SYSERR] =                  "system error",
198         [DLM_NOSUPPORT] =               "unsupported",
199         [DLM_CANCELGRANT] =             "can't cancel convert: already granted",
200         [DLM_IVLOCKID] =                "bad lockid",
201         [DLM_SYNC] =                    "synchronous request granted",
202         [DLM_BADTYPE] =                 "bad resource type",
203         [DLM_BADRESOURCE] =             "bad resource handle",
204         [DLM_MAXHANDLES] =              "no more resource handles",
205         [DLM_NOCLINFO] =                "can't contact cluster manager",
206         [DLM_NOLOCKMGR] =               "can't contact lock manager",
207         [DLM_NOPURGED] =                "can't contact purge daemon",
208         [DLM_BADARGS] =                 "bad api args",
209         [DLM_VOID] =                    "no status",
210         [DLM_NOTQUEUED] =               "NOQUEUE was specified and request failed",
211         [DLM_IVBUFLEN] =                "invalid resource name length",
212         [DLM_CVTUNGRANT] =              "attempted to convert ungranted lock",
213         [DLM_BADPARAM] =                "invalid lock mode specified",
214         [DLM_VALNOTVALID] =             "value block has been invalidated",
215         [DLM_REJECTED] =                "request rejected, unrecognized client",
216         [DLM_ABORT] =                   "blocked lock request cancelled",
217         [DLM_CANCEL] =                  "conversion request cancelled",
218         [DLM_IVRESHANDLE] =             "invalid resource handle",
219         [DLM_DEADLOCK] =                "deadlock recovery refused this request",
220         [DLM_DENIED_NOASTS] =           "failed to allocate AST",
221         [DLM_FORWARD] =                 "request must wait for primary's response",
222         [DLM_TIMEOUT] =                 "timeout value for lock has expired",
223         [DLM_IVGROUPID] =               "invalid group specification",
224         [DLM_VERS_CONFLICT] =           "version conflicts prevent request handling",
225         [DLM_BAD_DEVICE_PATH] =         "Locks device does not exist or path wrong",
226         [DLM_NO_DEVICE_PERMISSION] =    "Client has insufficient perms for device",
227         [DLM_NO_CONTROL_DEVICE] =       "Cannot set options on opened device ",
228         [DLM_RECOVERING] =              "lock resource being recovered",
229         [DLM_MIGRATING] =               "lock resource being migrated",
230         [DLM_MAXSTATS] =                "invalid error number",
231 };
232
233 const char *dlm_errmsg(enum dlm_status err)
234 {
235         if (err >= DLM_MAXSTATS || err < 0)
236                 return dlm_errmsgs[DLM_MAXSTATS];
237         return dlm_errmsgs[err];
238 }
239 EXPORT_SYMBOL_GPL(dlm_errmsg);
240
241 const char *dlm_errname(enum dlm_status err)
242 {
243         if (err >= DLM_MAXSTATS || err < 0)
244                 return dlm_errnames[DLM_MAXSTATS];
245         return dlm_errnames[err];
246 }
247 EXPORT_SYMBOL_GPL(dlm_errname);
248
249 /* NOTE: This function converts a lockname into a string. It uses knowledge
250  * of the format of the lockname that should be outside the purview of the dlm.
251  * We are adding only to make dlm debugging slightly easier.
252  *
253  * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
254  */
255 static int stringify_lockname(const char *lockname, int locklen, char *buf,
256                               int len)
257 {
258         int out = 0;
259         __be64 inode_blkno_be;
260
261 #define OCFS2_DENTRY_LOCK_INO_START     18
262         if (*lockname == 'N') {
263                 memcpy((__be64 *)&inode_blkno_be,
264                        (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
265                        sizeof(__be64));
266                 out += snprintf(buf + out, len - out, "%.*s%08x",
267                                 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
268                                 (unsigned int)be64_to_cpu(inode_blkno_be));
269         } else
270                 out += snprintf(buf + out, len - out, "%.*s",
271                                 locklen, lockname);
272         return out;
273 }
274
275 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
276                              char *buf, int len)
277 {
278         int out = 0;
279         int i = -1;
280
281         while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
282                 out += snprintf(buf + out, len - out, "%d ", i);
283
284         return out;
285 }
286
287 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
288 {
289         int out = 0;
290         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
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 */
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
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
379 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
380 {
381         kref_get(&dc->debug_refcnt);
382 }
383
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
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
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
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 */
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
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 */
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
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 */
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
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
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
668 static void lockres_seq_stop(struct seq_file *m, void *v)
669 {
670 }
671
672 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
673 {
674         return NULL;
675 }
676
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
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
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 */
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
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 */
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
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 */
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
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 */
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
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 */