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

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