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

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