33 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping)  in file_ra_state_init()  argument
35 	ra->ra_pages = inode_to_bdi(mapping->host)->ra_pages;  in file_ra_state_init()
36 	ra->prev_pos = -1;  in file_ra_state_init()
226 	struct file_ra_state *ra = &filp->f_ra;  in force_page_cache_readahead()  local
236 	max_pages = max_t(unsigned long, bdi->io_pages, ra->ra_pages);  in force_page_cache_readahead()
275 static unsigned long get_next_ra_size(struct file_ra_state *ra,  in get_next_ra_size()  argument
278 	unsigned long cur = ra->size;  in get_next_ra_size()
348 				 struct file_ra_state *ra,  in try_context_readahead()  argument
371 	ra->start = offset;  in try_context_readahead()
372 	ra->size = min(size + req_size, max);  in try_context_readahead()
373 	ra->async_size = 1;  in try_context_readahead()
383 		   struct file_ra_state *ra, struct file *filp,  in ondemand_readahead()  argument
388 	unsigned long max_pages = ra->ra_pages;  in ondemand_readahead()
409 	if ((offset == (ra->start + ra->size - ra->async_size) ||  in ondemand_readahead()
410 	     offset == (ra->start + ra->size))) {  in ondemand_readahead()
411 		ra->start += ra->size;  in ondemand_readahead()
412 		ra->size = get_next_ra_size(ra, max_pages);  in ondemand_readahead()
413 		ra->async_size = ra->size;  in ondemand_readahead()
433 		ra->start = start;  in ondemand_readahead()
434 		ra->size = start - offset;	/* old async_size */  in ondemand_readahead()
435 		ra->size += req_size;  in ondemand_readahead()
436 		ra->size = get_next_ra_size(ra, max_pages);  in ondemand_readahead()
437 		ra->async_size = ra->size;  in ondemand_readahead()
452 	prev_offset = (unsigned long long)ra->prev_pos >> PAGE_SHIFT;  in ondemand_readahead()
460 	if (try_context_readahead(mapping, ra, offset, req_size, max_pages))  in ondemand_readahead()
470 	ra->start = offset;  in ondemand_readahead()
471 	ra->size = get_init_ra_size(req_size, max_pages);  in ondemand_readahead()
472 	ra->async_size = ra->size > req_size ? ra->size - req_size : ra->size;  in ondemand_readahead()
481 	if (offset == ra->start && ra->size == ra->async_size) {  in ondemand_readahead()
482 		add_pages = get_next_ra_size(ra, max_pages);  in ondemand_readahead()
483 		if (ra->size + add_pages <= max_pages) {  in ondemand_readahead()
484 			ra->async_size = add_pages;  in ondemand_readahead()
485 			ra->size += add_pages;  in ondemand_readahead()
487 			ra->size = max_pages;  in ondemand_readahead()
488 			ra->async_size = max_pages >> 1;  in ondemand_readahead()
492 	return ra_submit(ra, mapping, filp);  in ondemand_readahead()
510 			       struct file_ra_state *ra, struct file *filp,  in page_cache_sync_readahead()  argument
514 	if (!ra->ra_pages)  in page_cache_sync_readahead()
527 	ondemand_readahead(mapping, ra, filp, false, offset, req_size);  in page_cache_sync_readahead()
548 			   struct file_ra_state *ra, struct file *filp,  in page_cache_async_readahead()  argument
553 	if (!ra->ra_pages)  in page_cache_async_readahead()
574 	ondemand_readahead(mapping, ra, filp, true, offset, req_size);  in page_cache_async_readahead()