函数逻辑报告

函数名称：ad_cache_page - read into page cache, fill it if needed*@mapping: the page's address_space*@index: the page index*@filler: function to perform the read*@data: first arg to filler(data, page) function, often left as NULL* Read into the page cache

函数原型：struct page *read_cache_page(struct address_space *mapping, unsigned long index, int (*filler)(void *, struct page *), void *data)

返回类型：struct page

参数：