On Tue, 17 Oct 2023 20:35:46 +0800
Xiao Ni <xni@xxxxxxxxxx> wrote:
> After and include kernel v5.4, it adds one feature bit
> MD_FEATURE_RAID0_LAYOUT. It must need to specify a layout for raid0 with more
> than one zone. But for raid0 with one zone, in fact it also has a defalut
> layout.
>
> Now for raid0 with one zone, *unknown* layout can be seen when running mdadm
> -D command. It's the reason that mdadm doesn't set MD_FEATURE_RAID0_LAYOUT for
> raid0 with one zone. Then in kernel space, super_1_validate sets mddev->layout
> to -1 because of no MD_FEATURE_RAID0_LAYOUT. In fact, in raid0 io path, it
> uses the default layout. Set raid0_need_layout to true if
> kernel_version<=v5.4.
>
> Fixes: 329dfc28debb ('Create: add support for RAID0 layouts.')
> Signed-off-by: Xiao Ni <xni@xxxxxxxxxx>
> ---
LGTM.
Reviewed-by: Mariusz Tkaczyk <mariusz.tkaczyk@xxxxxxxxxxxxxxx>
Thanks,
Mariusz
