Hi,
On Sat, Jan 31, 2026 at 10:08:25AM +0100, 10dmar10 wrote:
> Package: src:linux
> Version: 6.18.5-1
> Severity: normal
> X-Debbugs-Cc: [email protected]
>
> Dear Maintainer,
>
> linux-image-6.18.5+deb14-amd64 seems to be unable to mount existing legacy
> XFS V4 filesystems
> reporting:
>
> XFS (...): Depricated V4 format (crc=0) not supported by kernel.
>
> reason seems to be a missing setting
> > cat /boot/config-6.18.5+deb14-amd64 | grep CONFIG_XFS_SUPPORT_V4
> # CONFIG_XFS_SUPPORT_V4 is not set
>
>
> this setting was recently still enabled:
>
> XFS (sda3): Deprecated V4 format (crc=0) will not be supported after
> September 2030.
>
> > cat /boot/config-6.17.13+deb14-amd64 | grep CONFIG_XFS_SUPPORT_V4
> CONFIG_XFS_SUPPORT_V4=y
>
>
> while no longer used by default, XFS V4 support is still useful for accessing
> legacy XFS V4 file systems as long as kernel supports it.
This is correct, the default was changed in upstream with f69260511c69
("xfs: disable deprecated features by default in Kconfig") and I
believe we should follow that within the forky release cycle.
Thus for forky I do not think we should diverge here from the default
and re-enable deprecated features, but probably we should document it
at least in the release notes so that people upgrading from trixie to
forky are awaere that V4 filesystems will not be supported anymore.
A NEWS entry in the packaging itself might be a good idea as well.
Regards,
Salvatore
