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ocfs2/dlm: Dumps the mles into a debugfs file

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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>
This commit is contained in:
Sunil Mushran 2008-03-10 15:16:26 -07:00 committed by Mark Fasheh
parent 751155a953
commit d0129aceae
2 changed files with 120 additions and 0 deletions
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119
fs/ocfs2/dlm/dlmdebug.c
View File

@ -302,6 +302,7 @@ static int stringify_lockname(const char *lockname, int locklen,
#define DLM_DEBUGFS_DIR "o2dlm"
#define DLM_DEBUGFS_DLM_STATE "dlm_state"
#define DLM_DEBUGFS_LOCKING_STATE "locking_state"
#define DLM_DEBUGFS_MLE_STATE "mle_state"
/* begin - utils funcs */
static void dlm_debug_free(struct kref *kref)
@ -395,6 +396,112 @@ static int debug_buffer_release(struct inode *inode, struct file *file)
}
/* end - util funcs */
/* begin - debug mle funcs */
static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
{
int out = 0;
unsigned int namelen;
const char *name;
char *mle_type;
if (mle->type != DLM_MLE_MASTER) {
namelen = mle->u.name.len;
name = mle->u.name.name;
} else {
namelen = mle->u.res->lockname.len;
name = mle->u.res->lockname.name;
}
if (mle->type == DLM_MLE_BLOCK)
mle_type = "BLK";
else if (mle->type == DLM_MLE_MASTER)
mle_type = "MAS";
else
mle_type = "MIG";
out += stringify_lockname(name, namelen, buf + out, len - out);
out += snprintf(buf + out, len - out,
"\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
mle_type, mle->master, mle->new_master,
!list_empty(&mle->hb_events),
!!mle->inuse,
atomic_read(&mle->mle_refs.refcount));
out += snprintf(buf + out, len - out, "Maybe=");
out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
out += snprintf(buf + out, len - out, "Vote=");
out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
out += snprintf(buf + out, len - out, "Response=");
out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
out += snprintf(buf + out, len - out, "Node=");
out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
out += snprintf(buf + out, len - out, "\n");
return out;
}
static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
{
struct dlm_master_list_entry *mle;
int out = 0;
unsigned long total = 0;
out += snprintf(db->buf + out, db->len - out,
"Dumping MLEs for Domain: %s\n", dlm->name);
spin_lock(&dlm->master_lock);
list_for_each_entry(mle, &dlm->master_list, list) {
++total;
if (db->len - out < 200)
continue;
out += dump_mle(mle, db->buf + out, db->len - out);
}
spin_unlock(&dlm->master_lock);
out += snprintf(db->buf + out, db->len - out,
"Total on list: %ld\n", total);
return out;
}
static int debug_mle_open(struct inode *inode, struct file *file)
{
struct dlm_ctxt *dlm = inode->i_private;
struct debug_buffer *db;
db = debug_buffer_allocate();
if (!db)
goto bail;
db->len = debug_mle_print(dlm, db);
file->private_data = db;
return 0;
bail:
return -ENOMEM;
}
static struct file_operations debug_mle_fops = {
.open = debug_mle_open,
.release = debug_buffer_release,
.read = debug_buffer_read,
.llseek = debug_buffer_llseek,
};
/* end - debug mle funcs */
/* begin - debug lockres funcs */
static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
{
@ -789,6 +896,16 @@ int dlm_debug_init(struct dlm_ctxt *dlm)
goto bail;
}
/* for dumping mles */
dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
S_IFREG|S_IRUSR,
dlm->dlm_debugfs_subroot,
dlm, &debug_mle_fops);
if (!dc->debug_mle_dentry) {
mlog_errno(-ENOMEM);
goto bail;
}
dlm_debug_get(dc);
return 0;
@ -802,6 +919,8 @@ void dlm_debug_shutdown(struct dlm_ctxt *dlm)
struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
if (dc) {
if (dc->debug_mle_dentry)
debugfs_remove(dc->debug_mle_dentry);
if (dc->debug_lockres_dentry)
debugfs_remove(dc->debug_lockres_dentry);
if (dc->debug_state_dentry)

1
fs/ocfs2/dlm/dlmdebug.h
View File

@ -31,6 +31,7 @@ struct dlm_debug_ctxt {
struct kref debug_refcnt;
struct dentry *debug_state_dentry;
struct dentry *debug_lockres_dentry;
struct dentry *debug_mle_dentry;
};
struct debug_buffer {