struct vfsmount *collect_mounts(struct path *path)
 {
 	struct mount *tree;
 	namespace_lock();
	if (!check_mnt(real_mount(path->mnt)))
		tree = ERR_PTR(-EINVAL);
	else
		tree = copy_tree(real_mount(path->mnt), path->dentry,
				 CL_COPY_ALL | CL_PRIVATE);
 	namespace_unlock();
 	if (IS_ERR(tree))
 		return ERR_CAST(tree);
	return &tree->mnt;
}

Unknown