hypfs_create_file
dentry = hypfs_create_file(parent, name, NULL, S_IFDIR | DIR_MODE);
dentry = hypfs_create_file(dir, "update", NULL,
hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE);
hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE);