Man page 9 : debugfs_rename

debugfs_rename - rename a file/directory in the debugfs filesystem

struct dentry * debugfs_rename(struct dentry *  old_dir , struct dentry *  old_dentry , struct dentry *  new_dir , const char *  new_name );

old_dir
    a pointer to the parent dentry for the renamed object. This should be a directory dentry.

old_dentry
    dentry of an object to be renamed.

new_dir
    a pointer to the parent dentry where the object should be moved. This should be a directory dentry.

new_name
    a pointer to a string containing the target name.

This function renames a file/directory in debugfs. The target must not exist for rename to succeed.

This function will return a pointer to old_dentry (which is updated to reflect renaming) if it succeeds. If an error occurs, NULL will be returned.

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