ocfs2/dlm: Create debugfs dirs

This patch creates the debugfs directories that will hold the
files to be used to dump the dlm state.

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>

1 files changed, 49 insertions, 1 deletions

diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index 64239b37e5d4..62e2a4cbf60d 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -30,6 +30,7 @@
 #include <linux/utsname.h>
 #include <linux/sysctl.h>
 #include <linux/spinlock.h>
+#include <linux/debugfs.h>
 
 #include "cluster/heartbeat.h"
 #include "cluster/nodemanager.h"
@@ -37,8 +38,8 @@
 
 #include "dlmapi.h"
 #include "dlmcommon.h"
-
 #include "dlmdomain.h"
+#include "dlmdebug.h"
 
 #define MLOG_MASK_PREFIX ML_DLM
 #include "cluster/masklog.h"
@@ -266,3 +267,50 @@ const char *dlm_errname(enum dlm_status err)
         return dlm_errnames[err];
 }
 EXPORT_SYMBOL_GPL(dlm_errname);
+
+
+#ifdef CONFIG_DEBUG_FS
+
+static struct dentry *dlm_debugfs_root = NULL;
+
+#define DLM_DEBUGFS_DIR                         "o2dlm"
+
+/* subroot - domain dir */
+int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
+{
+        dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
+                                                      dlm_debugfs_root);
+        if (!dlm->dlm_debugfs_subroot) {
+                mlog_errno(-ENOMEM);
+                goto bail;
+        }
+
+        return 0;
+bail:
+        dlm_destroy_debugfs_subroot(dlm);
+        return -ENOMEM;
+}
+
+void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
+{
+        if (dlm->dlm_debugfs_subroot)
+                debugfs_remove(dlm->dlm_debugfs_subroot);
+}
+
+/* debugfs root */
+int dlm_create_debugfs_root(void)
+{
+        dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
+        if (!dlm_debugfs_root) {
+                mlog_errno(-ENOMEM);
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+void dlm_destroy_debugfs_root(void)
+{
+        if (dlm_debugfs_root)
+                debugfs_remove(dlm_debugfs_root);
+}
+#endif  /* CONFIG_DEBUG_FS */