804 #define DEFINE_READAHEAD(rac, f, m, i)					\  argument
805 	struct readahead_control rac = {				\
874 static inline struct page *readahead_page(struct readahead_control *rac)  in readahead_page()  argument
878 	BUG_ON(rac->_batch_count > rac->_nr_pages);  in readahead_page()
879 	rac->_nr_pages -= rac->_batch_count;  in readahead_page()
880 	rac->_index += rac->_batch_count;  in readahead_page()
882 	if (!rac->_nr_pages) {  in readahead_page()
883 		rac->_batch_count = 0;  in readahead_page()
887 	page = xa_load(&rac->mapping->i_pages, rac->_index);  in readahead_page()
889 	rac->_batch_count = thp_nr_pages(page);  in readahead_page()
894 static inline unsigned int __readahead_batch(struct readahead_control *rac,  in __readahead_batch()  argument
898 	XA_STATE(xas, &rac->mapping->i_pages, 0);  in __readahead_batch()
901 	BUG_ON(rac->_batch_count > rac->_nr_pages);  in __readahead_batch()
902 	rac->_nr_pages -= rac->_batch_count;  in __readahead_batch()
903 	rac->_index += rac->_batch_count;  in __readahead_batch()
904 	rac->_batch_count = 0;  in __readahead_batch()
906 	xas_set(&xas, rac->_index);  in __readahead_batch()
908 	xas_for_each(&xas, page, rac->_index + rac->_nr_pages - 1) {  in __readahead_batch()
914 		rac->_batch_count += thp_nr_pages(page);  in __readahead_batch()
923 			xas_set(&xas, rac->_index + rac->_batch_count);  in __readahead_batch()
944 #define readahead_page_batch(rac, array)				\  argument
945 	__readahead_batch(rac, array, ARRAY_SIZE(array))
951 static inline loff_t readahead_pos(struct readahead_control *rac)  in readahead_pos()  argument
953 	return (loff_t)rac->_index * PAGE_SIZE;  in readahead_pos()
960 static inline loff_t readahead_length(struct readahead_control *rac)  in readahead_length()  argument
962 	return (loff_t)rac->_nr_pages * PAGE_SIZE;  in readahead_length()
969 static inline pgoff_t readahead_index(struct readahead_control *rac)  in readahead_index()  argument
971 	return rac->_index;  in readahead_index()
978 static inline unsigned int readahead_count(struct readahead_control *rac)  in readahead_count()  argument
980 	return rac->_nr_pages;  in readahead_count()