28 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping)  in file_ra_state_init()  argument
30 	ra->ra_pages = inode_to_bdi(mapping->host)->ra_pages;  in file_ra_state_init()
31 	ra->prev_pos = -1;  in file_ra_state_init()
259 static unsigned long get_next_ra_size(struct file_ra_state *ra,  in get_next_ra_size()  argument
262 	unsigned long cur = ra->size;  in get_next_ra_size()
334 				 struct file_ra_state *ra,  in try_context_readahead()  argument
357 	ra->start = offset;  in try_context_readahead()
358 	ra->size = min(size + req_size, max);  in try_context_readahead()
359 	ra->async_size = 1;  in try_context_readahead()
369 		   struct file_ra_state *ra, struct file *filp,  in ondemand_readahead()  argument
373 	unsigned long max = ra->ra_pages;  in ondemand_readahead()
386 	if ((offset == (ra->start + ra->size - ra->async_size) ||  in ondemand_readahead()
387 	     offset == (ra->start + ra->size))) {  in ondemand_readahead()
388 		ra->start += ra->size;  in ondemand_readahead()
389 		ra->size = get_next_ra_size(ra, max);  in ondemand_readahead()
390 		ra->async_size = ra->size;  in ondemand_readahead()
410 		ra->start = start;  in ondemand_readahead()
411 		ra->size = start - offset;	/* old async_size */  in ondemand_readahead()
412 		ra->size += req_size;  in ondemand_readahead()
413 		ra->size = get_next_ra_size(ra, max);  in ondemand_readahead()
414 		ra->async_size = ra->size;  in ondemand_readahead()
429 	prev_offset = (unsigned long long)ra->prev_pos >> PAGE_CACHE_SHIFT;  in ondemand_readahead()
437 	if (try_context_readahead(mapping, ra, offset, req_size, max))  in ondemand_readahead()
447 	ra->start = offset;  in ondemand_readahead()
448 	ra->size = get_init_ra_size(req_size, max);  in ondemand_readahead()
449 	ra->async_size = ra->size > req_size ? ra->size - req_size : ra->size;  in ondemand_readahead()
457 	if (offset == ra->start && ra->size == ra->async_size) {  in ondemand_readahead()
458 		ra->async_size = get_next_ra_size(ra, max);  in ondemand_readahead()
459 		ra->size += ra->async_size;  in ondemand_readahead()
462 	return ra_submit(ra, mapping, filp);  in ondemand_readahead()
480 			       struct file_ra_state *ra, struct file *filp,  in page_cache_sync_readahead()  argument
484 	if (!ra->ra_pages)  in page_cache_sync_readahead()
494 	ondemand_readahead(mapping, ra, filp, false, offset, req_size);  in page_cache_sync_readahead()
515 			   struct file_ra_state *ra, struct file *filp,  in page_cache_async_readahead()  argument
520 	if (!ra->ra_pages)  in page_cache_async_readahead()
538 	ondemand_readahead(mapping, ra, filp, true, offset, req_size);  in page_cache_async_readahead()