diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 8c0ff985c191..fa22bb29eee6 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4340,6 +4340,8 @@ int try_release_extent_mapping(struct extent_map_tree *map,
 
 			/* once for us */
 			free_extent_map(em);
+
+			cond_resched(); /* Allow large-extent preemption. */
 		}
 	}
 	return try_release_extent_state(map, tree, page, mask);