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authorSunil Mushran <sunil.mushran@oracle.com>2008-03-10 18:16:26 -0400
committerMark Fasheh <mfasheh@suse.com>2008-04-18 11:56:09 -0400
commitd0129aceaecc2b1f5171b8e8036eb469b6e0fe81 (patch)
tree30a949c91d66f9b7e97e4fe85186aac958075e67 /fs/ocfs2
parent751155a953e1fe558d3d3c3db7087712ffc15c3e (diff)
ocfs2/dlm: Dumps the mles into a debugfs file
This patch dumps all mles it can fit in one page into a debugfs file. Useful for debugging. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2')
-rw-r--r--fs/ocfs2/dlm/dlmdebug.c119
-rw-r--r--fs/ocfs2/dlm/dlmdebug.h1
2 files changed, 120 insertions, 0 deletions
diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index cccb1ce33723..6de326bf603a 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -302,6 +302,7 @@ static int stringify_lockname(const char *lockname, int locklen,
302#define DLM_DEBUGFS_DIR "o2dlm" 302#define DLM_DEBUGFS_DIR "o2dlm"
303#define DLM_DEBUGFS_DLM_STATE "dlm_state" 303#define DLM_DEBUGFS_DLM_STATE "dlm_state"
304#define DLM_DEBUGFS_LOCKING_STATE "locking_state" 304#define DLM_DEBUGFS_LOCKING_STATE "locking_state"
305#define DLM_DEBUGFS_MLE_STATE "mle_state"
305 306
306/* begin - utils funcs */ 307/* begin - utils funcs */
307static void dlm_debug_free(struct kref *kref) 308static void dlm_debug_free(struct kref *kref)
@@ -395,6 +396,112 @@ static int debug_buffer_release(struct inode *inode, struct file *file)
395} 396}
396/* end - util funcs */ 397/* end - util funcs */
397 398
399/* begin - debug mle funcs */
400static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
401{
402 int out = 0;
403 unsigned int namelen;
404 const char *name;
405 char *mle_type;
406
407 if (mle->type != DLM_MLE_MASTER) {
408 namelen = mle->u.name.len;
409 name = mle->u.name.name;
410 } else {
411 namelen = mle->u.res->lockname.len;
412 name = mle->u.res->lockname.name;
413 }
414
415 if (mle->type == DLM_MLE_BLOCK)
416 mle_type = "BLK";
417 else if (mle->type == DLM_MLE_MASTER)
418 mle_type = "MAS";
419 else
420 mle_type = "MIG";
421
422 out += stringify_lockname(name, namelen, buf + out, len - out);
423 out += snprintf(buf + out, len - out,
424 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
425 mle_type, mle->master, mle->new_master,
426 !list_empty(&mle->hb_events),
427 !!mle->inuse,
428 atomic_read(&mle->mle_refs.refcount));
429
430 out += snprintf(buf + out, len - out, "Maybe=");
431 out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
432 buf + out, len - out);
433 out += snprintf(buf + out, len - out, "\n");
434
435 out += snprintf(buf + out, len - out, "Vote=");
436 out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
437 buf + out, len - out);
438 out += snprintf(buf + out, len - out, "\n");
439
440 out += snprintf(buf + out, len - out, "Response=");
441 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
442 buf + out, len - out);
443 out += snprintf(buf + out, len - out, "\n");
444
445 out += snprintf(buf + out, len - out, "Node=");
446 out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
447 buf + out, len - out);
448 out += snprintf(buf + out, len - out, "\n");
449
450 out += snprintf(buf + out, len - out, "\n");
451
452 return out;
453}
454
455static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
456{
457 struct dlm_master_list_entry *mle;
458 int out = 0;
459 unsigned long total = 0;
460
461 out += snprintf(db->buf + out, db->len - out,
462 "Dumping MLEs for Domain: %s\n", dlm->name);
463
464 spin_lock(&dlm->master_lock);
465 list_for_each_entry(mle, &dlm->master_list, list) {
466 ++total;
467 if (db->len - out < 200)
468 continue;
469 out += dump_mle(mle, db->buf + out, db->len - out);
470 }
471 spin_unlock(&dlm->master_lock);
472
473 out += snprintf(db->buf + out, db->len - out,
474 "Total on list: %ld\n", total);
475 return out;
476}
477
478static int debug_mle_open(struct inode *inode, struct file *file)
479{
480 struct dlm_ctxt *dlm = inode->i_private;
481 struct debug_buffer *db;
482
483 db = debug_buffer_allocate();
484 if (!db)
485 goto bail;
486
487 db->len = debug_mle_print(dlm, db);
488
489 file->private_data = db;
490
491 return 0;
492bail:
493 return -ENOMEM;
494}
495
496static struct file_operations debug_mle_fops = {
497 .open = debug_mle_open,
498 .release = debug_buffer_release,
499 .read = debug_buffer_read,
500 .llseek = debug_buffer_llseek,
501};
502
503/* end - debug mle funcs */
504
398/* begin - debug lockres funcs */ 505/* begin - debug lockres funcs */
399static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len) 506static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
400{ 507{
@@ -789,6 +896,16 @@ int dlm_debug_init(struct dlm_ctxt *dlm)
789 goto bail; 896 goto bail;
790 } 897 }
791 898
899 /* for dumping mles */
900 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
901 S_IFREG|S_IRUSR,
902 dlm->dlm_debugfs_subroot,
903 dlm, &debug_mle_fops);
904 if (!dc->debug_mle_dentry) {
905 mlog_errno(-ENOMEM);
906 goto bail;
907 }
908
792 dlm_debug_get(dc); 909 dlm_debug_get(dc);
793 return 0; 910 return 0;
794 911
@@ -802,6 +919,8 @@ void dlm_debug_shutdown(struct dlm_ctxt *dlm)
802 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt; 919 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
803 920
804 if (dc) { 921 if (dc) {
922 if (dc->debug_mle_dentry)
923 debugfs_remove(dc->debug_mle_dentry);
805 if (dc->debug_lockres_dentry) 924 if (dc->debug_lockres_dentry)
806 debugfs_remove(dc->debug_lockres_dentry); 925 debugfs_remove(dc->debug_lockres_dentry);
807 if (dc->debug_state_dentry) 926 if (dc->debug_state_dentry)
diff --git a/fs/ocfs2/dlm/dlmdebug.h b/fs/ocfs2/dlm/dlmdebug.h
index 7c5b2b0a05ed..cbc69f295782 100644
--- a/fs/ocfs2/dlm/dlmdebug.h
+++ b/fs/ocfs2/dlm/dlmdebug.h
@@ -31,6 +31,7 @@ struct dlm_debug_ctxt {
31 struct kref debug_refcnt; 31 struct kref debug_refcnt;
32 struct dentry *debug_state_dentry; 32 struct dentry *debug_state_dentry;
33 struct dentry *debug_lockres_dentry; 33 struct dentry *debug_lockres_dentry;
34 struct dentry *debug_mle_dentry;
34}; 35};
35 36
36struct debug_buffer { 37struct debug_buffer {