Ublk Enables User-Space Virtual Block Devices

Ublk, a user-space framework introduced in Linux v6.0 and maintained by Ming Lei, enables creation of virtual block devices using io_uring and is marked experimental as of Jan 13, 2026. The framework exposes servers as /dev/ublkbN and /dev/ublkcN, letting user-space daemons handle I/O with language freedom, isolation, and independent release schedules. By batching requests via io_uring, ublk amortizes context-switch costs, improving high-throughput I/O performance.