/******************************************************
File space management

(c) 1995 Innobase Oy

Created 12/18/1995 Heikki Tuuri
*******************************************************/

/***************************************************************************
Checks if a page address is an extent descriptor page address. */
UNIV_INLINE
ibool
fsp_descr_page(
/*===========*/
			/* out: TRUE if a descriptor page */
	ulint	zip_size,/* in: compressed page size in bytes;
			0 for uncompressed pages */
	ulint	page_no)/* in: page number */
{
	ut_ad(ut_is_2pow(zip_size));

	if (!zip_size) {
		return(UNIV_UNLIKELY((page_no & (UNIV_PAGE_SIZE - 1))
				     == FSP_XDES_OFFSET));
	}

	return(UNIV_UNLIKELY((page_no & (zip_size - 1)) == FSP_XDES_OFFSET));
}