struct page *ll_get_dir_page(struct inode *dir, struct md_op_data *op_data,
__u64 offset, struct ll_dir_chain *chain);
void ll_release_page(struct inode *inode, struct page *page, bool remove);
struct page *ll_get_dir_page(struct inode *dir, struct md_op_data *op_data,
__u64 offset, struct ll_dir_chain *chain);
void ll_release_page(struct inode *inode, struct page *page, bool remove);