bcache: Set ra_pages based on backing device's ra_pages

Signed-off-by: Kent Overstreet <koverstreet@google.com>

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index f1e69f2fad37dcd219601b796ed5c46fb5385ef2..6817ea46cf0a3db40b25a4a1f80bdda93640fb9c 100644 (file)
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1067,6 +1067,10 @@ static const char *register_bdev(struct cache_sb *sb, struct page *sb_page,
 
        set_capacity(g, dc->bdev->bd_part->nr_sects - dc->sb.data_offset);
 
+       g->queue->backing_dev_info.ra_pages =
+               max(g->queue->backing_dev_info.ra_pages,
+                   bdev->bd_queue->backing_dev_info.ra_pages);
+
        bch_cached_dev_request_init(dc);
 
        err = "error creating kobject";