34 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping)  in file_ra_state_init()  argument
36 	ra->ra_pages = inode_to_bdi(mapping->host)->ra_pages;  in file_ra_state_init()
37 	ra->prev_pos = -1;  in file_ra_state_init()
280 	struct file_ra_state *ra = ractl->ra;  in force_page_cache_ra()  local
293 	max_pages = max_t(unsigned long, bdi->io_pages, ra->ra_pages);  in force_page_cache_ra()
332 static unsigned long get_next_ra_size(struct file_ra_state *ra,  in get_next_ra_size()  argument
335 	unsigned long cur = ra->size;  in get_next_ra_size()
405 				 struct file_ra_state *ra,  in try_context_readahead()  argument
428 	ra->start = index;  in try_context_readahead()
429 	ra->size = min(size + req_size, max);  in try_context_readahead()
430 	ra->async_size = 1;  in try_context_readahead()
442 	struct file_ra_state *ra = ractl->ra;  in ondemand_readahead()  local
443 	unsigned long max_pages = ra->ra_pages;  in ondemand_readahead()
465 	if ((index == (ra->start + ra->size - ra->async_size) ||  in ondemand_readahead()
466 	     index == (ra->start + ra->size))) {  in ondemand_readahead()
467 		ra->start += ra->size;  in ondemand_readahead()
468 		ra->size = get_next_ra_size(ra, max_pages);  in ondemand_readahead()
469 		ra->async_size = ra->size;  in ondemand_readahead()
490 		ra->start = start;  in ondemand_readahead()
491 		ra->size = start - index;	/* old async_size */  in ondemand_readahead()
492 		ra->size += req_size;  in ondemand_readahead()
493 		ra->size = get_next_ra_size(ra, max_pages);  in ondemand_readahead()
494 		ra->async_size = ra->size;  in ondemand_readahead()
509 	prev_index = (unsigned long long)ra->prev_pos >> PAGE_SHIFT;  in ondemand_readahead()
517 	if (try_context_readahead(ractl->mapping, ra, index, req_size,  in ondemand_readahead()
529 	ra->start = index;  in ondemand_readahead()
530 	ra->size = get_init_ra_size(req_size, max_pages);  in ondemand_readahead()
531 	ra->async_size = ra->size > req_size ? ra->size - req_size : ra->size;  in ondemand_readahead()
540 	if (index == ra->start && ra->size == ra->async_size) {  in ondemand_readahead()
541 		add_pages = get_next_ra_size(ra, max_pages);  in ondemand_readahead()
542 		if (ra->size + add_pages <= max_pages) {  in ondemand_readahead()
543 			ra->async_size = add_pages;  in ondemand_readahead()
544 			ra->size += add_pages;  in ondemand_readahead()
546 			ra->size = max_pages;  in ondemand_readahead()
547 			ra->async_size = max_pages >> 1;  in ondemand_readahead()
551 	ractl->_index = ra->start;  in ondemand_readahead()
552 	do_page_cache_ra(ractl, ra->size, ra->async_size);  in ondemand_readahead()
566 	if (!ractl->ra->ra_pages || blk_cgroup_congested()) {  in page_cache_sync_ra()
588 	if (!ractl->ra->ra_pages)  in page_cache_async_ra()
666 	struct file_ra_state *ra = ractl->ra;  in readahead_expand()  local
711 		if (ra) {  in readahead_expand()
712 			ra->size++;  in readahead_expand()
713 			ra->async_size++;  in readahead_expand()