On 1/31/25 4:50 AM, Shinichiro Kawasaki wrote:

On Jan 28, 2025 / 15:50, Alan Adamson wrote:

quoted

Tests basic atomic write functionality using NVMe devices
that support the AWUN and AWUPF Controller Atomic Parameters
and NAWUN and NAWUPF Namespace Atomic Parameters.

Testing areas include:

- Verify sysfs atomic write attributes are consistent with
   atomic write capablities advertised by the NVMe HW.

- Verify the atomic write paramters of statx are correct using
   xfs_io.

- Perform a pwritev2() (with and without RWF_ATOMIC flag) using
   xfs_io:
     - maximum byte size (atomic_write_unit_max_bytes)
     - a write larger than atomic_write_unit_max_bytes

These test contests are smallre than those in scsi/009. Is it intentional?
No "minimum byte size" test, and no "a write smaller than
atomic_write_unit_min_bytes" test.

SCSI supports atomic writes a bit differently than NVMe.  SCSI has an 
atomic granularity which translates to a minimum write size when doing 
an atomic write.  NVMe doesn't have this concept and always guarantees 
writes of 1 block will be atomic so the additional tests aren't need for 
NVMe.

Alan