[$] Atomic block-write operations

Martin Petersen and John Garry led a session at the2023 Linux Storage, Filesystem,Memory-Management and BPF Summit on work they have been doing toimplement atomic block writes of various sizes for SCSI and NVMe. The idea is to support devices that can guarantee atomic operations forsizes larger than their block size. It isan attempt to "find common ground" between the two standards, Petersen said, because the twohave slightly different semantics, depending on the device type, anddifferent restrictions, which has made for an "interesting project". It hasbeen a challenge to find an abstraction layer that can work with the "fivedifferent variants of SCSI and NVMe implementations that may or may not be out there".