batcher
struct batcher *b = container_of(_ws, struct batcher, commit_work);
static void batcher_init(struct batcher *b,
static void async_commit(struct batcher *b)
static void continue_after_commit(struct batcher *b, struct continuation *k)
static void issue_after_commit(struct batcher *b, struct bio *bio)
static void schedule_commit(struct batcher *b)
struct batcher committer;