ublk_log
ublk_log("%s: thread %d commit(nr_bufs %u, buf_size %u, start %u)\n",
ublk_log("dev id %d: nr_hw_queues %d queue_depth %d block size %d dev_capacity %lld\n",
ublk_log("\tmax rq size %d daemon pid %d flags 0x%llx state %s\n",