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-rw-r--r--fs/debugfs/inode.c16
-rw-r--r--include/linux/debugfs.h8
2 files changed, 24 insertions, 0 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 81ae9ea3c6e..0662ba6de85 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -30,6 +30,7 @@
static struct vfsmount *debugfs_mount;
static int debugfs_mount_count;
+static bool debugfs_registered;
static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t dev)
{
@@ -496,6 +497,16 @@ exit:
}
EXPORT_SYMBOL_GPL(debugfs_rename);
+/**
+ * debugfs_initialized - Tells whether debugfs has been registered
+ */
+bool debugfs_initialized(void)
+{
+ return debugfs_registered;
+}
+EXPORT_SYMBOL_GPL(debugfs_initialized);
+
+
static struct kobject *debug_kobj;
static int __init debugfs_init(void)
@@ -509,11 +520,16 @@ static int __init debugfs_init(void)
retval = register_filesystem(&debug_fs_type);
if (retval)
kobject_put(debug_kobj);
+ else
+ debugfs_registered = true;
+
return retval;
}
static void __exit debugfs_exit(void)
{
+ debugfs_registered = false;
+
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
unregister_filesystem(&debug_fs_type);
kobject_put(debug_kobj);
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index af0e01d4c66..eb5c2ba2f81 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -71,6 +71,9 @@ struct dentry *debugfs_create_bool(const char *name, mode_t mode,
struct dentry *debugfs_create_blob(const char *name, mode_t mode,
struct dentry *parent,
struct debugfs_blob_wrapper *blob);
+
+bool debugfs_initialized(void);
+
#else
#include <linux/err.h>
@@ -183,6 +186,11 @@ static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
return ERR_PTR(-ENODEV);
}
+static inline bool debugfs_initialized(void)
+{
+ return false;
+}
+
#endif
#endif