suse man page for debugfs_create_dir

DEBUGFS_CREATE_DIR(9)					      The debugfs filesystem					     DEBUGFS_CREATE_DIR(9)

NAME
       debugfs_create_dir - create a directory in the debugfs filesystem

SYNOPSIS
       struct dentry * debugfs_create_dir(const char * name, struct dentry * parent);

ARGUMENTS
       name
	   a pointer to a string containing the name of the directory to create.

       parent
	   a pointer to the parent dentry for this file. This should be a directory dentry if set. If this paramater is NULL, then the directory
	   will be created in the root of the debugfs filesystem.

DESCRIPTION
       This function creates a directory in debugfs with the given name.

       This function will return a pointer to a dentry if it succeeds. This pointer must be passed to the debugfs_remove function when the file is
       to be removed (no automatic cleanup happens if your module is unloaded, you are responsible here.) If an error occurs, NULL will be
       returned.

       If debugfs is not enabled in the kernel, the value -ENODEV will be returned.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						     DEBUGFS_CREATE_DIR(9)