On 7/8/25 4:38 AM, Shin'ichiro Kawasaki wrote:
From: Alan Adamson <alan.adamson@xxxxxxxxxx>
Add a new test (md/002) to verify atomic write support for MD devices
(RAID 0, 1, and 10) stacked on top of SCSI devices using scsi_debug with
atomic write emulation enabled.
This test validates that atomic write sysfs attributes are correctly
propagated through MD layers, and that pwritev2() with RWF_ATOMIC
behaves as expected on these devices.
Specifically, the test checks:
- That atomic write attributes in /sys/block/.../queue are consistent
between MD and underlying SCSI devices
- That atomic write limits are respected in user-space via xfs_io
- That statx reports accurate atomic_write_unit_{min,max} values
- That invalid writes (too small or too large) fail as expected
- That chunk size affects max atomic write limits (for RAID 0/10)
Signed-off-by: Alan Adamson <alan.adamson@xxxxxxxxxx>
[Shin'ichiro: replaced spaces with tabs, removed group_requires() call]
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
---
Alan, thanks for the patch. I take the liberty to modify your original
patch [1] to reflect my review comments.
As to the kernel version check, I left it as it is since I can not think
of other simple way.
Sorry, I took too long to get back to this. Your changes look good.
Alan
