* @param[in] pgno the page number for the page to retrieve.
* @param[out] ret address of a pointer where the page's address will be stored.
* @param[out] lvl dirty_list inheritance level of found page. 1=current txn, 0=mapped page.
* @return 0 on success, non-zero on failure.
*/
static int
* @param[in] pgno the page number for the page to retrieve.
* @param[out] ret address of a pointer where the page's address will be stored.
* @param[out] lvl dirty_list inheritance level of found page. 1=current txn, 0=mapped page.
* @return 0 on success, non-zero on failure.
*/
static int