321 static unsigned long get_init_ra_size(unsigned long size, unsigned long max)  in get_init_ra_size()  argument
323 	unsigned long newsize = roundup_pow_of_two(size);  in get_init_ra_size()
342 	unsigned long cur = ra->size;  in get_next_ra_size()
417 	pgoff_t size;  in try_context_readahead()  local
419 	size = count_history_pages(mapping, index, max);  in try_context_readahead()
425 	if (size <= req_size)  in try_context_readahead()
432 	if (size >= index)  in try_context_readahead()
433 		size *= 2;  in try_context_readahead()
436 	ra->size = min(size + req_size, max);  in try_context_readahead()
474 	if ((index == (ra->start + ra->size - ra->async_size) ||  in ondemand_readahead()
475 	     index == (ra->start + ra->size))) {  in ondemand_readahead()
476 		ra->start += ra->size;  in ondemand_readahead()
477 		ra->size = get_next_ra_size(ra, max_pages);  in ondemand_readahead()
478 		ra->async_size = ra->size;  in ondemand_readahead()
500 		ra->size = start - index;	/* old async_size */  in ondemand_readahead()
501 		ra->size += req_size;  in ondemand_readahead()
502 		ra->size = get_next_ra_size(ra, max_pages);  in ondemand_readahead()
503 		ra->async_size = ra->size;  in ondemand_readahead()
539 	ra->size = get_init_ra_size(req_size, max_pages);  in ondemand_readahead()
540 	ra->async_size = ra->size > req_size ? ra->size - req_size : ra->size;  in ondemand_readahead()
549 	if (index == ra->start && ra->size == ra->async_size) {  in ondemand_readahead()
551 		if (ra->size + add_pages <= max_pages) {  in ondemand_readahead()
553 			ra->size += add_pages;  in ondemand_readahead()
555 			ra->size = max_pages;  in ondemand_readahead()
561 	do_page_cache_ra(ractl, ra->size, ra->async_size);  in ondemand_readahead()