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

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