old_mode
static void __cache_mark_many(struct dm_buffer_cache *bc, int old_mode, int new_mode,
le = lru_evict(&bc->lru[old_mode], __evict_pred, &w, bc->no_sleep);
static void cache_mark_many(struct dm_buffer_cache *bc, int old_mode, int new_mode,
__cache_mark_many(bc, old_mode, new_mode, pred, context, &lh);