174 void page_cache_ra_unbounded(struct readahead_control *ractl,  in page_cache_ra_unbounded()  argument
177 	struct address_space *mapping = ractl->mapping;  in page_cache_ra_unbounded()
178 	unsigned long index = readahead_index(ractl);  in page_cache_ra_unbounded()
211 			read_pages(ractl, &page_pool, true);  in page_cache_ra_unbounded()
212 			i = ractl->_index + ractl->_nr_pages - index - 1;  in page_cache_ra_unbounded()
225 			read_pages(ractl, &page_pool, true);  in page_cache_ra_unbounded()
226 			i = ractl->_index + ractl->_nr_pages - index - 1;  in page_cache_ra_unbounded()
231 		ractl->_nr_pages++;  in page_cache_ra_unbounded()
239 	read_pages(ractl, &page_pool, false);  in page_cache_ra_unbounded()
251 void do_page_cache_ra(struct readahead_control *ractl,  in do_page_cache_ra()  argument
254 	struct inode *inode = ractl->mapping->host;  in do_page_cache_ra()
255 	unsigned long index = readahead_index(ractl);  in do_page_cache_ra()
269 	page_cache_ra_unbounded(ractl, nr_to_read, lookahead_size);  in do_page_cache_ra()
276 void force_page_cache_ra(struct readahead_control *ractl,  in force_page_cache_ra()  argument
279 	struct address_space *mapping = ractl->mapping;  in force_page_cache_ra()
280 	struct file_ra_state *ra = ractl->ra;  in force_page_cache_ra()
292 	index = readahead_index(ractl);  in force_page_cache_ra()
300 		ractl->_index = index;  in force_page_cache_ra()
301 		do_page_cache_ra(ractl, this_chunk, 0);  in force_page_cache_ra()
438 static void ondemand_readahead(struct readahead_control *ractl,  in ondemand_readahead()  argument
441 	struct backing_dev_info *bdi = inode_to_bdi(ractl->mapping->host);  in ondemand_readahead()
442 	struct file_ra_state *ra = ractl->ra;  in ondemand_readahead()
445 	unsigned long index = readahead_index(ractl);  in ondemand_readahead()
483 		start = page_cache_next_miss(ractl->mapping, index + 1,  in ondemand_readahead()
517 	if (try_context_readahead(ractl->mapping, ra, index, req_size,  in ondemand_readahead()
525 	do_page_cache_ra(ractl, req_size, 0);  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()
555 void page_cache_sync_ra(struct readahead_control *ractl,  in page_cache_sync_ra()  argument
558 	bool do_forced_ra = ractl->file && (ractl->file->f_mode & FMODE_RANDOM);  in page_cache_sync_ra()
566 	if (!ractl->ra->ra_pages || blk_cgroup_congested()) {  in page_cache_sync_ra()
567 		if (!ractl->file)  in page_cache_sync_ra()
575 		force_page_cache_ra(ractl, req_count);  in page_cache_sync_ra()
580 	ondemand_readahead(ractl, false, req_count);  in page_cache_sync_ra()
584 void page_cache_async_ra(struct readahead_control *ractl,  in page_cache_async_ra()  argument
588 	if (!ractl->ra->ra_pages)  in page_cache_async_ra()
602 	if (inode_read_congested(ractl->mapping->host))  in page_cache_async_ra()
609 	ondemand_readahead(ractl, true, req_count);  in page_cache_async_ra()
662 void readahead_expand(struct readahead_control *ractl,  in readahead_expand()  argument
665 	struct address_space *mapping = ractl->mapping;  in readahead_expand()
666 	struct file_ra_state *ra = ractl->ra;  in readahead_expand()
673 	while (ractl->_index > new_index) {  in readahead_expand()
674 		unsigned long index = ractl->_index - 1;  in readahead_expand()
688 		ractl->_nr_pages++;  in readahead_expand()
689 		ractl->_index = page->index;  in readahead_expand()
692 	new_len += new_start - readahead_pos(ractl);  in readahead_expand()
696 	while (ractl->_nr_pages < new_nr_pages) {  in readahead_expand()
697 		unsigned long index = ractl->_index + ractl->_nr_pages;  in readahead_expand()
710 		ractl->_nr_pages++;  in readahead_expand()