XPost: linux.debian.bugs.dist   
   From: 10dmar10@gmail.com   
      
   Am 31.01.26 um 11:02 schrieb Salvatore Bonaccorso:   
    > 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: 10dmar10@gmail.com   
    >>   
    >> 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   
      
   Hi,   
      
   I wrote this bug report because I assumed the release interval for forky as   
   2027   
   -2030, which is within the kernel removal date for XFS V4 feature in 2030.   
      
   Enabling CONFIG_XFS_SUPPORT_V4 would allow to continue running otherwise   
   perfectly fine existing legacy XFS V4 filesystems without unnecessary breaking   
   anything within forky's release cycle...   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)