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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/dlm/dlmdebug.c

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  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 
 34 #include "cluster/heartbeat.h"
 35 #include "cluster/nodemanager.h"
 36 #include "cluster/tcp.h"
 37 
 38 #include "dlmapi.h"
 39 #include "dlmcommon.h"
 40 #include "dlmdomain.h"
 41 #include "dlmdebug.h"
 42 
 43 #define MLOG_MASK_PREFIX ML_DLM
 44 #include "cluster/masklog.h"
 45 
 46 static int stringify_lockname(const char *lockname, int locklen, char *buf,
 47                               int len);
 48 
 49 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 50 {
 51         spin_lock(&res->spinlock);
 52         __dlm_print_one_lock_resource(res);
 53         spin_unlock(&res->spinlock);
 54 }
 55 
 56 static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
 57 {
 58         int bit;
 59         assert_spin_locked(&res->spinlock);
 60 
 61         printk("  refmap nodes: [ ");
 62         bit = 0;
 63         while (1) {
 64                 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
 65                 if (bit >= O2NM_MAX_NODES)
 66                         break;
 67                 printk("%u ", bit);
 68                 bit++;
 69         }
 70         printk("], inflight=%u\n", res->inflight_locks);
 71 }
 72 
 73 static void __dlm_print_lock(struct dlm_lock *lock)
 74 {
 75         spin_lock(&lock->spinlock);
 76 
 77         printk("    type=%d, conv=%d, node=%u, cookie=%u:%llu, "
 78                "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), "
 79                "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n",
 80                lock->ml.type, lock->ml.convert_type, lock->ml.node,
 81                dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
 82                dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 83                atomic_read(&lock->lock_refs.refcount),
 84                (list_empty(&lock->ast_list) ? 'y' : 'n'),
 85                (lock->ast_pending ? 'y' : 'n'),
 86                (list_empty(&lock->bast_list) ? 'y' : 'n'),
 87                (lock->bast_pending ? 'y' : 'n'),
 88                (lock->convert_pending ? 'y' : 'n'),
 89                (lock->lock_pending ? 'y' : 'n'),
 90                (lock->cancel_pending ? 'y' : 'n'),
 91                (lock->unlock_pending ? 'y' : 'n'));
 92 
 93         spin_unlock(&lock->spinlock);
 94 }
 95 
 96 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 97 {
 98         struct list_head *iter2;
 99         struct dlm_lock *lock;
100         char buf[DLM_LOCKID_NAME_MAX];
101 
102         assert_spin_locked(&res->spinlock);
103 
104         stringify_lockname(res->lockname.name, res->lockname.len,
105                            buf, sizeof(buf));
106         printk("lockres: %s, owner=%u, state=%u\n",
107                buf, res->owner, res->state);
108         printk("  last used: %lu, refcnt: %u, on purge list: %s\n",
109                res->last_used, atomic_read(&res->refs.refcount),
110                list_empty(&res->purge) ? "no" : "yes");
111         printk("  on dirty list: %s, on reco list: %s, "
112                "migrating pending: %s\n",
113                list_empty(&res->dirty) ? "no" : "yes",
114                list_empty(&res->recovering) ? "no" : "yes",
115                res->migration_pending ? "yes" : "no");
116         printk("  inflight locks: %d, asts reserved: %d\n",
117                res->inflight_locks, atomic_read(&res->asts_reserved));
118         dlm_print_lockres_refmap(res);
119         printk("  granted queue:\n");
120         list_for_each(iter2, &res->granted) {
121                 lock = list_entry(iter2, struct dlm_lock, list);
122                 __dlm_print_lock(lock);
123         }
124         printk("  converting queue:\n");
125         list_for_each(iter2, &res->converting) {
126                 lock = list_entry(iter2, struct dlm_lock, list);
127                 __dlm_print_lock(lock);
128         }
129         printk("  blocked queue:\n");
130         list_for_each(iter2, &res->blocked) {
131                 lock = list_entry(iter2, struct dlm_lock, list);
132                 __dlm_print_lock(lock);
133         }
134 }
135 
136 void dlm_print_one_lock(struct dlm_lock *lockid)
137 {
138         dlm_print_one_lock_resource(lockid->lockres);
139 }
140 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
141 
142 static const char *dlm_errnames[] = {
143         [DLM_NORMAL] =                  "DLM_NORMAL",
144         [DLM_GRANTED] =                 "DLM_GRANTED",
145         [DLM_DENIED] =                  "DLM_DENIED",
146         [DLM_DENIED_NOLOCKS] =          "DLM_DENIED_NOLOCKS",
147         [DLM_WORKING] =                 "DLM_WORKING",
148         [DLM_BLOCKED] =                 "DLM_BLOCKED",
149         [DLM_BLOCKED_ORPHAN] =          "DLM_BLOCKED_ORPHAN",
150         [DLM_DENIED_GRACE_PERIOD] =     "DLM_DENIED_GRACE_PERIOD",
151         [DLM_SYSERR] =                  "DLM_SYSERR",
152         [DLM_NOSUPPORT] =               "DLM_NOSUPPORT",
153         [DLM_CANCELGRANT] =             "DLM_CANCELGRANT",
154         [DLM_IVLOCKID] =                "DLM_IVLOCKID",
155         [DLM_SYNC] =                    "DLM_SYNC",
156         [DLM_BADTYPE] =                 "DLM_BADTYPE",
157         [DLM_BADRESOURCE] =             "DLM_BADRESOURCE",
158         [DLM_MAXHANDLES] =              "DLM_MAXHANDLES",
159         [DLM_NOCLINFO] =                "DLM_NOCLINFO",
160         [DLM_NOLOCKMGR] =               "DLM_NOLOCKMGR",
161         [DLM_NOPURGED] =                "DLM_NOPURGED",
162         [DLM_BADARGS] =                 "DLM_BADARGS",
163         [DLM_VOID] =                    "DLM_VOID",
164         [DLM_NOTQUEUED] =               "DLM_NOTQUEUED",
165         [DLM_IVBUFLEN] =                "DLM_IVBUFLEN",
166         [DLM_CVTUNGRANT] =              "DLM_CVTUNGRANT",
167         [DLM_BADPARAM] =                "DLM_BADPARAM",
168         [DLM_VALNOTVALID] =             "DLM_VALNOTVALID",
169         [DLM_REJECTED] =                "DLM_REJECTED",
170         [DLM_ABORT] =                   "DLM_ABORT",
171         [DLM_CANCEL] =                  "DLM_CANCEL",
172         [DLM_IVRESHANDLE] =             "DLM_IVRESHANDLE",
173         [DLM_DEADLOCK] =                "DLM_DEADLOCK",
174         [DLM_DENIED_NOASTS] =           "DLM_DENIED_NOASTS",
175         [DLM_FORWARD] =                 "DLM_FORWARD",
176         [DLM_TIMEOUT] =                 "DLM_TIMEOUT",
177         [DLM_IVGROUPID] =               "DLM_IVGROUPID",
178         [DLM_VERS_CONFLICT] =           "DLM_VERS_CONFLICT",
179         [DLM_BAD_DEVICE_PATH] =         "DLM_BAD_DEVICE_PATH",
180         [DLM_NO_DEVICE_PERMISSION] =    "DLM_NO_DEVICE_PERMISSION",
181         [DLM_NO_CONTROL_DEVICE ] =      "DLM_NO_CONTROL_DEVICE ",
182         [DLM_RECOVERING] =              "DLM_RECOVERING",
183         [DLM_MIGRATING] =               "DLM_MIGRATING",
184         [DLM_MAXSTATS] =                "DLM_MAXSTATS",
185 };
186 
187 static const char *dlm_errmsgs[] = {
188         [DLM_NORMAL] =                  "request in progress",
189         [DLM_GRANTED] =                 "request granted",
190         [DLM_DENIED] =                  "request denied",
191         [DLM_DENIED_NOLOCKS] =          "request denied, out of system resources",
192         [DLM_WORKING] =                 "async request in progress",
193         [DLM_BLOCKED] =                 "lock request blocked",
194         [DLM_BLOCKED_ORPHAN] =          "lock request blocked by a orphan lock",
195         [DLM_DENIED_GRACE_PERIOD] =     "topological change in progress",
196         [DLM_SYSERR] =                  "system error",
197         [DLM_NOSUPPORT] =               "unsupported",
198         [DLM_CANCELGRANT] =             "can't cancel convert: already granted",
199         [DLM_IVLOCKID] =                "bad lockid",
200         [DLM_SYNC] =                    "synchronous request granted",
201         [DLM_BADTYPE] =                 "bad resource type",
202         [DLM_BADRESOURCE] =             "bad resource handle",
203         [DLM_MAXHANDLES] =              "no more resource handles",
204         [DLM_NOCLINFO] =                "can't contact cluster manager",
205         [DLM_NOLOCKMGR] =               "can't contact lock manager",
206         [DLM_NOPURGED] =                "can't contact purge daemon",
207         [DLM_BADARGS] =                 "bad api args",
208         [DLM_VOID] =                    "no status",
209         [DLM_NOTQUEUED] =               "NOQUEUE was specified and request failed",
210         [DLM_IVBUFLEN] =                "invalid resource name length",
211         [DLM_CVTUNGRANT] =              "attempted to convert ungranted lock",
212         [DLM_BADPARAM] =                "invalid lock mode specified",
213         [DLM_VALNOTVALID] =             "value block has been invalidated",
214         [DLM_REJECTED] =                "request rejected, unrecognized client",
215         [DLM_ABORT] =                   "blocked lock request cancelled",
216         [DLM_CANCEL] =                  "conversion request cancelled",
217         [DLM_IVRESHANDLE] =             "invalid resource handle",
218         [DLM_DEADLOCK] =                "deadlock recovery refused this request",
219         [DLM_DENIED_NOASTS] =           "failed to allocate AST",
220         [DLM_FORWARD] =                 "request must wait for primary's response",
221         [DLM_TIMEOUT] =                 "timeout value for lock has expired",
222         [DLM_IVGROUPID] =               "invalid group specification",
223         [DLM_VERS_CONFLICT] =           "version conflicts prevent request handling",
224         [DLM_BAD_DEVICE_PATH] =         "Locks device does not exist or path wrong",
225         [DLM_NO_DEVICE_PERMISSION] =    "Client has insufficient perms for device",
226         [DLM_NO_CONTROL_DEVICE] =       "Cannot set options on opened device ",
227         [DLM_RECOVERING] =              "lock resource being recovered",
228         [DLM_MIGRATING] =               "lock resource being migrated",
229         [DLM_MAXSTATS] =                "invalid error number",
230 };
231 
232 const char *dlm_errmsg(enum dlm_status err)
233 {
234         if (err >= DLM_MAXSTATS || err < 0)
235                 return dlm_errmsgs[DLM_MAXSTATS];
236         return dlm_errmsgs[err];
237 }
238 EXPORT_SYMBOL_GPL(dlm_errmsg);
239 
240 const char *dlm_errname(enum dlm_status err)
241 {
242         if (err >= DLM_MAXSTATS || err < 0)
243                 return dlm_errnames[DLM_MAXSTATS];
244         return dlm_errnames[err];
245 }
246 EXPORT_SYMBOL_GPL(dlm_errname);
247 
248 /* NOTE: This function converts a lockname into a string. It uses knowledge
249  * of the format of the lockname that should be outside the purview of the dlm.
250  * We are adding only to make dlm debugging slightly easier.
251  *
252  * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
253  */
254 static int stringify_lockname(const char *lockname, int locklen, char *buf,
255                               int len)
256 {
257         int out = 0;
258         __be64 inode_blkno_be;
259 
260 #define OCFS2_DENTRY_LOCK_INO_START     18
261         if (*lockname == 'N') {
262                 memcpy((__be64 *)&inode_blkno_be,
263                        (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
264                        sizeof(__be64));
265                 out += snprintf(buf + out, len - out, "%.*s%08x",
266                                 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
267                                 (unsigned int)be64_to_cpu(inode_blkno_be));
268         } else
269                 out += snprintf(buf + out, len - out, "%.*s",
270                                 locklen, lockname);
271         return out;
272 }
273 
274 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
275                              char *buf, int len)
276 {
277         int out = 0;
278         int i = -1;
279 
280         while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
281                 out += snprintf(buf + out, len - out, "%d ", i);
282 
283         return out;
284 }
285 
286 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
287 {
288         int out = 0;
289         char *mle_type;
290 
291         if (mle->type == DLM_MLE_BLOCK)
292                 mle_type = "BLK";
293         else if (mle->type == DLM_MLE_MASTER)
294                 mle_type = "MAS";
295         else
296                 mle_type = "MIG";
297 
298         out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
299         out += snprintf(buf + out, len - out,
300                         "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
301                         mle_type, mle->master, mle->new_master,
302                         !list_empty(&mle->hb_events),
303                         !!mle->inuse,
304                         atomic_read(&mle->mle_refs.refcount));
305 
306         out += snprintf(buf + out, len - out, "Maybe=");
307         out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
308                                  buf + out, len - out);
309         out += snprintf(buf + out, len - out, "\n");
310 
311         out += snprintf(buf + out, len - out, "Vote=");
312         out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
313                                  buf + out, len - out);
314         out += snprintf(buf + out, len - out, "\n");
315 
316         out += snprintf(buf + out, len - out, "Response=");
317         out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
318                                  buf + out, len - out);
319         out += snprintf(buf + out, len - out, "\n");
320 
321         out += snprintf(buf + out, len - out, "Node=");
322         out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
323                                  buf + out, len - out);
324         out += snprintf(buf + out, len - out, "\n");
325 
326         out += snprintf(buf + out, len - out, "\n");
327 
328         return out;
329 }
330 
331 void dlm_print_one_mle(struct dlm_master_list_entry *mle)
332 {
333         char *buf;
334 
335         buf = (char *) get_zeroed_page(GFP_NOFS);
336         if (buf) {
337                 dump_mle(mle, buf, PAGE_SIZE - 1);
338                 free_page((unsigned long)buf);
339         }
340 }
341 
342 #ifdef CONFIG_DEBUG_FS
343 
344 static struct dentry *dlm_debugfs_root = NULL;
345 
346 #define DLM_DEBUGFS_DIR                         "o2dlm"
347 #define DLM_DEBUGFS_DLM_STATE                   "dlm_state"
348 #define DLM_DEBUGFS_LOCKING_STATE               "locking_state"
349 #define DLM_DEBUGFS_MLE_STATE                   "mle_state"
350 #define DLM_DEBUGFS_PURGE_LIST                  "purge_list"
351 
352 /* begin - utils funcs */
353 static void dlm_debug_free(struct kref *kref)
354 {
355         struct dlm_debug_ctxt *dc;
356 
357         dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
358 
359         kfree(dc);
360 }
361 
362 static void dlm_debug_put(struct dlm_debug_ctxt *dc)
363 {
364         if (dc)
365                 kref_put(&dc->debug_refcnt, dlm_debug_free);
366 }
367 
368 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
369 {
370         kref_get(&dc->debug_refcnt);
371 }
372 
373 static int debug_release(struct inode *inode, struct file *file)
374 {
375         free_page((unsigned long)file->private_data);
376         return 0;
377 }
378 
379 static ssize_t debug_read(struct file *file, char __user *buf,
380                           size_t nbytes, loff_t *ppos)
381 {
382         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
383                                        i_size_read(file->f_mapping->host));
384 }
385 /* end - util funcs */
386 
387 /* begin - purge list funcs */
388 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
389 {
390         struct dlm_lock_resource *res;
391         int out = 0;
392         unsigned long total = 0;
393 
394         out += snprintf(buf + out, len - out,
395                         "Dumping Purgelist for Domain: %s\n", dlm->name);
396 
397         spin_lock(&dlm->spinlock);
398         list_for_each_entry(res, &dlm->purge_list, purge) {
399                 ++total;
400                 if (len - out < 100)
401                         continue;
402                 spin_lock(&res->spinlock);
403                 out += stringify_lockname(res->lockname.name,
404                                           res->lockname.len,
405                                           buf + out, len - out);
406                 out += snprintf(buf + out, len - out, "\t%ld\n",
407                                 (jiffies - res->last_used)/HZ);
408                 spin_unlock(&res->spinlock);
409         }
410         spin_unlock(&dlm->spinlock);
411 
412         out += snprintf(buf + out, len - out, "Total on list: %ld\n", total);
413 
414         return out;
415 }
416 
417 static int debug_purgelist_open(struct inode *inode, struct file *file)
418 {
419         struct dlm_ctxt *dlm = inode->i_private;
420         char *buf = NULL;
421 
422         buf = (char *) get_zeroed_page(GFP_NOFS);
423         if (!buf)
424                 goto bail;
425 
426         i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
427 
428         file->private_data = buf;
429 
430         return 0;
431 bail:
432         return -ENOMEM;
433 }
434 
435 static const struct file_operations debug_purgelist_fops = {
436         .open =         debug_purgelist_open,
437         .release =      debug_release,
438         .read =         debug_read,
439         .llseek =       generic_file_llseek,
440 };
441 /* end - purge list funcs */
442 
443 /* begin - debug mle funcs */
444 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
445 {
446         struct dlm_master_list_entry *mle;
447         struct hlist_head *bucket;
448         struct hlist_node *list;
449         int i, out = 0;
450         unsigned long total = 0, longest = 0, bucket_count = 0;
451 
452         out += snprintf(buf + out, len - out,
453                         "Dumping MLEs for Domain: %s\n", dlm->name);
454 
455         spin_lock(&dlm->master_lock);
456         for (i = 0; i < DLM_HASH_BUCKETS; i++) {
457                 bucket = dlm_master_hash(dlm, i);
458                 hlist_for_each(list, bucket) {
459                         mle = hlist_entry(list, struct dlm_master_list_entry,
460                                           master_hash_node);
461                         ++total;
462                         ++bucket_count;
463                         if (len - out < 200)
464                                 continue;
465                         out += dump_mle(mle, buf + out, len - out);
466                 }
467                 longest = max(longest, bucket_count);
468                 bucket_count = 0;
469         }
470         spin_unlock(&dlm->master_lock);
471 
472         out += snprintf(buf + out, len - out,
473                         "Total: %ld, Longest: %ld\n", total, longest);
474         return out;
475 }
476 
477 static int debug_mle_open(struct inode *inode, struct file *file)
478 {
479         struct dlm_ctxt *dlm = inode->i_private;
480         char *buf = NULL;
481 
482         buf = (char *) get_zeroed_page(GFP_NOFS);
483         if (!buf)
484                 goto bail;
485 
486         i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
487 
488         file->private_data = buf;
489 
490         return 0;
491 bail:
492         return -ENOMEM;
493 }
494 
495 static const struct file_operations debug_mle_fops = {
496         .open =         debug_mle_open,
497         .release =      debug_release,
498         .read =         debug_read,
499         .llseek =       generic_file_llseek,
500 };
501 
502 /* end - debug mle funcs */
503 
504 /* begin - debug lockres funcs */
505 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
506 {
507         int out;
508 
509 #define DEBUG_LOCK_VERSION      1
510         spin_lock(&lock->spinlock);
511         out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
512                        "%d,%d,%d,%d\n",
513                        DEBUG_LOCK_VERSION,
514                        list_type, lock->ml.type, lock->ml.convert_type,
515                        lock->ml.node,
516                        dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
517                        dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
518                        !list_empty(&lock->ast_list),
519                        !list_empty(&lock->bast_list),
520                        lock->ast_pending, lock->bast_pending,
521                        lock->convert_pending, lock->lock_pending,
522                        lock->cancel_pending, lock->unlock_pending,
523                        atomic_read(&lock->lock_refs.refcount));
524         spin_unlock(&lock->spinlock);
525 
526         return out;
527 }
528 
529 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
530 {
531         struct dlm_lock *lock;
532         int i;
533         int out = 0;
534 
535         out += snprintf(buf + out, len - out, "NAME:");
536         out += stringify_lockname(res->lockname.name, res->lockname.len,
537                                   buf + out, len - out);
538         out += snprintf(buf + out, len - out, "\n");
539 
540 #define DEBUG_LRES_VERSION      1
541         out += snprintf(buf + out, len - out,
542                         "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
543                         DEBUG_LRES_VERSION,
544                         res->owner, res->state, res->last_used,
545                         !list_empty(&res->purge),
546                         !list_empty(&res->dirty),
547                         !list_empty(&res->recovering),
548                         res->inflight_locks, res->migration_pending,
549                         atomic_read(&res->asts_reserved),
550                         atomic_read(&res->refs.refcount));
551 
552         /* refmap */
553         out += snprintf(buf + out, len - out, "RMAP:");
554         out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
555                                  buf + out, len - out);
556         out += snprintf(buf + out, len - out, "\n");
557 
558         /* lvb */
559         out += snprintf(buf + out, len - out, "LVBX:");
560         for (i = 0; i < DLM_LVB_LEN; i++)
561                 out += snprintf(buf + out, len - out,
562                                         "%02x", (unsigned char)res->lvb[i]);
563         out += snprintf(buf + out, len - out, "\n");
564 
565         /* granted */
566         list_for_each_entry(lock, &res->granted, list)
567                 out += dump_lock(lock, 0, buf + out, len - out);
568 
569         /* converting */
570         list_for_each_entry(lock, &res->converting, list)
571                 out += dump_lock(lock, 1, buf + out, len - out);
572 
573         /* blocked */
574         list_for_each_entry(lock, &res->blocked, list)
575                 out += dump_lock(lock, 2, buf + out, len - out);
576 
577         out += snprintf(buf + out, len - out, "\n");
578 
579         return out;
580 }
581 
582 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
583 {
584         struct debug_lockres *dl = m->private;
585         struct dlm_ctxt *dlm = dl->dl_ctxt;
586         struct dlm_lock_resource *oldres = dl->dl_res;
587         struct dlm_lock_resource *res = NULL;
588         struct list_head *track_list;
589 
590         spin_lock(&dlm->track_lock);
591         if (oldres)
592                 track_list = &oldres->tracking;
593         else {
594                 track_list = &dlm->tracking_list;
595                 if (list_empty(track_list)) {
596                         dl = NULL;
597                         spin_unlock(&dlm->track_lock);
598                         goto bail;
599                 }
600         }
601 
602         list_for_each_entry(res, track_list, tracking) {
603                 if (&res->tracking == &dlm->tracking_list)
604                         res = NULL;
605                 else
606                         dlm_lockres_get(res);
607                 break;
608         }
609         spin_unlock(&dlm->track_lock);
610 
611         if (oldres)
612                 dlm_lockres_put(oldres);
613 
614         dl->dl_res = res;
615 
616         if (res) {
617                 spin_lock(&res->spinlock);
618                 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
619                 spin_unlock(&res->spinlock);
620         } else
621                 dl = NULL;
622 
623 bail:
624         /* passed to seq_show */
625         return dl;
626 }
627 
628 static void lockres_seq_stop(struct seq_file *m, void *v)
629 {
630 }
631 
632 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
633 {
634         return NULL;
635 }
636 
637 static int lockres_seq_show(struct seq_file *s, void *v)
638 {
639         struct debug_lockres *dl = (struct debug_lockres *)v;
640 
641         seq_printf(s, "%s", dl->dl_buf);
642 
643         return 0;
644 }
645 
646 static const struct seq_operations debug_lockres_ops = {
647         .start =        lockres_seq_start,
648         .stop =         lockres_seq_stop,
649         .next =         lockres_seq_next,
650         .show =         lockres_seq_show,
651 };
652 
653 static int debug_lockres_open(struct inode *inode, struct file *file)
654 {
655         struct dlm_ctxt *dlm = inode->i_private;
656         int ret = -ENOMEM;
657         struct seq_file *seq;
658         struct debug_lockres *dl = NULL;
659 
660         dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
661         if (!dl) {
662                 mlog_errno(ret);
663                 goto bail;
664         }
665 
666         dl->dl_len = PAGE_SIZE;
667         dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
668         if (!dl->dl_buf) {
669                 mlog_errno(ret);
670                 goto bail;
671         }
672 
673         ret = seq_open(file, &debug_lockres_ops);
674         if (ret) {
675                 mlog_errno(ret);
676                 goto bail;
677         }
678 
679         seq = file->private_data;
680         seq->private = dl;
681 
682         dlm_grab(dlm);
683         dl->dl_ctxt = dlm;
684 
685         return 0;
686 bail:
687         if (dl)
688                 kfree(dl->dl_buf);
689         kfree(dl);
690         return ret;
691 }
692 
693 static int debug_lockres_release(struct inode *inode, struct file *file)
694 {
695         struct seq_file *seq = file->private_data;
696         struct debug_lockres *dl = (struct debug_lockres *)seq->private;
697 
698         if (dl->dl_res)
699                 dlm_lockres_put(dl->dl_res);
700         dlm_put(dl->dl_ctxt);
701         kfree(dl->dl_buf);
702         return seq_release_private(inode, file);
703 }
704 
705 static const struct file_operations debug_lockres_fops = {
706         .open =         debug_lockres_open,
707         .release =      debug_lockres_release,
708         .read =         seq_read,
709         .llseek =       seq_lseek,
710 };
711 /* end - debug lockres funcs */
712 
713 /* begin - debug state funcs */
714 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
715 {
716         int out = 0;
717         struct dlm_reco_node_data *node;
718         char *state;
719         int cur_mles = 0, tot_mles = 0;
720         int i;
721 
722         spin_lock(&dlm->spinlock);
723 
724         switch (dlm->dlm_state) {
725         case DLM_CTXT_NEW:
726                 state = "NEW"; break;
727         case DLM_CTXT_JOINED:
728                 state = "JOINED"; break;
729         case DLM_CTXT_IN_SHUTDOWN:
730                 state = "SHUTDOWN"; break;
731         case DLM_CTXT_LEAVING:
732                 state = "LEAVING"; break;
733         default:
734                 state = "UNKNOWN"; break;
735         }
736 
737         /* Domain: xxxxxxxxxx  Key: 0xdfbac769 */
738         out += snprintf(buf + out, len - out,
739                         "Domain: %s  Key: 0x%08x  Protocol: %d.%d\n",
740                         dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
741                         dlm->dlm_locking_proto.pv_minor);
742 
743         /* Thread Pid: xxx  Node: xxx  State: xxxxx */
744         out += snprintf(buf + out, len - out,
745                         "Thread Pid: %d  Node: %d  State: %s\n",
746                         task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
747 
748         /* Number of Joins: xxx  Joining Node: xxx */
749         out += snprintf(buf + out, len - out,
750                         "Number of Joins: %d  Joining Node: %d\n",
751                         dlm->num_joins, dlm->joining_node);
752 
753         /* Domain Map: xx xx xx */
754         out += snprintf(buf + out, len - out, "Domain Map: ");
755         out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
756                                  buf + out, len - out);
757         out += snprintf(buf + out, len - out, "\n");
758 
759         /* Exit Domain Map: xx xx xx */
760         out += snprintf(buf + out, len - out, "Exit Domain Map: ");
761         out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES,
762                                  buf + out, len - out);
763         out += snprintf(buf + out, len - out, "\n");
764 
765         /* Live Map: xx xx xx */
766         out += snprintf(buf + out, len - out, "Live Map: ");
767         out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
768                                  buf + out, len - out);
769         out += snprintf(buf + out, len - out, "\n");
770 
771         /* Lock Resources: xxx (xxx) */
772         out += snprintf(buf + out, len - out,
773                         "Lock Resources: %d (%d)\n",
774                         atomic_read(&dlm->res_cur_count),
775                         atomic_read(&dlm->res_tot_count));
776 
777         for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
778                 tot_mles += atomic_read(&dlm->mle_tot_count[i]);
779 
780         for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
781                 cur_mles += atomic_read(&dlm->mle_cur_count[i]);
782 
783         /* MLEs: xxx (xxx) */
784         out += snprintf(buf + out, len - out,
785                         "MLEs: %d (%d)\n", cur_mles, tot_mles);
786 
787         /*  Blocking: xxx (xxx) */
788         out += snprintf(buf + out, len - out,
789                         "  Blocking: %d (%d)\n",
790                         atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
791                         atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
792 
793         /*  Mastery: xxx (xxx) */
794         out += snprintf(buf + out, len - out,
795                         "  Mastery: %d (%d)\n",
796                         atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
797                         atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
798 
799         /*  Migration: xxx (xxx) */
800         out += snprintf(buf + out, len - out,
801                         "  Migration: %d (%d)\n",
802                         atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
803                         atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
804 
805         /* Lists: Dirty=Empty  Purge=InUse  PendingASTs=Empty  ... */
806         out += snprintf(buf + out, len - out,
807                         "Lists: Dirty=%s  Purge=%s  PendingASTs=%s  "
808                         "PendingBASTs=%s\n",
809                         (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
810                         (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
811                         (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
812                         (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
813 
814         /* Purge Count: xxx  Refs: xxx */
815         out += snprintf(buf + out, len - out,
816                         "Purge Count: %d  Refs: %d\n", dlm->purge_count,
817                         atomic_read(&dlm->dlm_refs.refcount));
818 
819         /* Dead Node: xxx */
820         out += snprintf(buf + out, len - out,
821                         "Dead Node: %d\n", dlm->reco.dead_node);
822 
823         /* What about DLM_RECO_STATE_FINALIZE? */
824         if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
825                 state = "ACTIVE";
826         else
827                 state = "INACTIVE";
828 
829         /* Recovery Pid: xxxx  Master: xxx  State: xxxx */
830         out += snprintf(buf + out, len - out,
831                         "Recovery Pid: %d  Master: %d  State: %s\n",
832                         task_pid_nr(dlm->dlm_reco_thread_task),
833                         dlm->reco.new_master, state);
834 
835         /* Recovery Map: xx xx */
836         out += snprintf(buf + out, len - out, "Recovery Map: ");
837         out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
838                                  buf + out, len - out);
839         out += snprintf(buf + out, len - out, "\n");
840 
841         /* Recovery Node State: */
842         out += snprintf(buf + out, len - out, "Recovery Node State:\n");
843         list_for_each_entry(node, &dlm->reco.node_data, list) {
844                 switch (node->state) {
845                 case DLM_RECO_NODE_DATA_INIT:
846                         state = "INIT";
847                         break;
848                 case DLM_RECO_NODE_DATA_REQUESTING:
849                         state = "REQUESTING";
850                         break;
851                 case DLM_RECO_NODE_DATA_DEAD:
852                         state = "DEAD";
853                         break;
854                 case DLM_RECO_NODE_DATA_RECEIVING:
855                         state = "RECEIVING";
856                         break;
857                 case DLM_RECO_NODE_DATA_REQUESTED:
858                         state = "REQUESTED";
859                         break;
860                 case DLM_RECO_NODE_DATA_DONE:
861                         state = "DONE";
862                         break;
863                 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
864                         state = "FINALIZE-SENT";
865                         break;
866                 default:
867                         state = "BAD";
868                         break;
869                 }
870                 out += snprintf(buf + out, len - out, "\t%u - %s\n",
871                                 node->node_num, state);
872         }
873 
874         spin_unlock(&dlm->spinlock);
875 
876         return out;
877 }
878 
879 static int debug_state_open(struct inode *inode, struct file *file)
880 {
881         struct dlm_ctxt *dlm = inode->i_private;
882         char *buf = NULL;
883 
884         buf = (char *) get_zeroed_page(GFP_NOFS);
885         if (!buf)
886                 goto bail;
887 
888         i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
889 
890         file->private_data = buf;
891 
892         return 0;
893 bail:
894         return -ENOMEM;
895 }
896 
897 static const struct file_operations debug_state_fops = {
898         .open =         debug_state_open,
899         .release =      debug_release,
900         .read =         debug_read,
901         .llseek =       generic_file_llseek,
902 };
903 /* end  - debug state funcs */
904 
905 /* files in subroot */
906 int dlm_debug_init(struct dlm_ctxt *dlm)
907 {
908         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
909 
910         /* for dumping dlm_ctxt */
911         dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
912                                                      S_IFREG|S_IRUSR,
913                                                      dlm->dlm_debugfs_subroot,
914                                                      dlm, &debug_state_fops);
915         if (!dc->debug_state_dentry) {
916                 mlog_errno(-ENOMEM);
917                 goto bail;
918         }
919 
920         /* for dumping lockres */
921         dc->debug_lockres_dentry =
922                         debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
923                                             S_IFREG|S_IRUSR,
924                                             dlm->dlm_debugfs_subroot,
925                                             dlm, &debug_lockres_fops);
926         if (!dc->debug_lockres_dentry) {
927                 mlog_errno(-ENOMEM);
928                 goto bail;
929         }
930 
931         /* for dumping mles */
932         dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
933                                                    S_IFREG|S_IRUSR,
934                                                    dlm->dlm_debugfs_subroot,
935                                                    dlm, &debug_mle_fops);
936         if (!dc->debug_mle_dentry) {
937                 mlog_errno(-ENOMEM);
938                 goto bail;
939         }
940 
941         /* for dumping lockres on the purge list */
942         dc->debug_purgelist_dentry =
943                         debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
944                                             S_IFREG|S_IRUSR,
945                                             dlm->dlm_debugfs_subroot,
946                                             dlm, &debug_purgelist_fops);
947         if (!dc->debug_purgelist_dentry) {
948                 mlog_errno(-ENOMEM);
949                 goto bail;
950         }
951 
952         dlm_debug_get(dc);
953         return 0;
954 
955 bail:
956         dlm_debug_shutdown(dlm);
957         return -ENOMEM;
958 }
959 
960 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
961 {
962         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
963 
964         if (dc) {
965                 debugfs_remove(dc->debug_purgelist_dentry);
966                 debugfs_remove(dc->debug_mle_dentry);
967                 debugfs_remove(dc->debug_lockres_dentry);
968                 debugfs_remove(dc->debug_state_dentry);
969                 dlm_debug_put(dc);
970         }
971 }
972 
973 /* subroot - domain dir */
974 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
975 {
976         dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
977                                                       dlm_debugfs_root);
978         if (!dlm->dlm_debugfs_subroot) {
979                 mlog_errno(-ENOMEM);
980                 goto bail;
981         }
982 
983         dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
984                                       GFP_KERNEL);
985         if (!dlm->dlm_debug_ctxt) {
986                 mlog_errno(-ENOMEM);
987                 goto bail;
988         }
989         kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
990 
991         return 0;
992 bail:
993         dlm_destroy_debugfs_subroot(dlm);
994         return -ENOMEM;
995 }
996 
997 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
998 {
999         debugfs_remove(dlm->dlm_debugfs_subroot);
1000 }
1001 
1002 /* debugfs root */
1003 int dlm_create_debugfs_root(void)
1004 {
1005         dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
1006         if (!dlm_debugfs_root) {
1007                 mlog_errno(-ENOMEM);
1008                 return -ENOMEM;
1009         }
1010         return 0;
1011 }
1012 
1013 void dlm_destroy_debugfs_root(void)
1014 {
1015         debugfs_remove(dlm_debugfs_root);
1016 }
1017 #endif  /* CONFIG_DEBUG_FS */
1018 

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