28 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping)  in file_ra_state_init()  argument
30 	ra->ra_pages = mapping->backing_dev_info->ra_pages;  in file_ra_state_init()
31 	ra->prev_pos = -1;  in file_ra_state_init()
269 static unsigned long get_next_ra_size(struct file_ra_state *ra,  in get_next_ra_size()  argument
272 	unsigned long cur = ra->size;  in get_next_ra_size()
344 				 struct file_ra_state *ra,  in try_context_readahead()  argument
367 	ra->start = offset;  in try_context_readahead()
368 	ra->size = min(size + req_size, max);  in try_context_readahead()
369 	ra->async_size = 1;  in try_context_readahead()
379 		   struct file_ra_state *ra, struct file *filp,  in ondemand_readahead()  argument
383 	unsigned long max = max_sane_readahead(ra->ra_pages);  in ondemand_readahead()
396 	if ((offset == (ra->start + ra->size - ra->async_size) ||  in ondemand_readahead()
397 	     offset == (ra->start + ra->size))) {  in ondemand_readahead()
398 		ra->start += ra->size;  in ondemand_readahead()
399 		ra->size = get_next_ra_size(ra, max);  in ondemand_readahead()
400 		ra->async_size = ra->size;  in ondemand_readahead()
420 		ra->start = start;  in ondemand_readahead()
421 		ra->size = start - offset;	/* old async_size */  in ondemand_readahead()
422 		ra->size += req_size;  in ondemand_readahead()
423 		ra->size = get_next_ra_size(ra, max);  in ondemand_readahead()
424 		ra->async_size = ra->size;  in ondemand_readahead()
439 	prev_offset = (unsigned long long)ra->prev_pos >> PAGE_CACHE_SHIFT;  in ondemand_readahead()
447 	if (try_context_readahead(mapping, ra, offset, req_size, max))  in ondemand_readahead()
457 	ra->start = offset;  in ondemand_readahead()
458 	ra->size = get_init_ra_size(req_size, max);  in ondemand_readahead()
459 	ra->async_size = ra->size > req_size ? ra->size - req_size : ra->size;  in ondemand_readahead()
467 	if (offset == ra->start && ra->size == ra->async_size) {  in ondemand_readahead()
468 		ra->async_size = get_next_ra_size(ra, max);  in ondemand_readahead()
469 		ra->size += ra->async_size;  in ondemand_readahead()
472 	return ra_submit(ra, mapping, filp);  in ondemand_readahead()
490 			       struct file_ra_state *ra, struct file *filp,  in page_cache_sync_readahead()  argument
494 	if (!ra->ra_pages)  in page_cache_sync_readahead()
504 	ondemand_readahead(mapping, ra, filp, false, offset, req_size);  in page_cache_sync_readahead()
525 			   struct file_ra_state *ra, struct file *filp,  in page_cache_async_readahead()  argument
530 	if (!ra->ra_pages)  in page_cache_async_readahead()
548 	ondemand_readahead(mapping, ra, filp, true, offset, req_size);  in page_cache_async_readahead()