XFS V5 filesystems can be upgraded: https://wiki.gentoo.org/wiki/XFS#Year_2038_timestamp_support_.28bigtime.29 https://wiki.gentoo.org/wiki/XFS#Year_2038_timest

XFS V5 filesystems can be upgraded: https://wiki.gentoo.org/wiki/XFS#Year_2038_timestamp_support_.28bigtime.29 https://wiki.gentoo.org/wiki/XFS#Year_2038_timestamp_support... Edit: I see that V5 is the upstream default since "only" ~2015, so indeed there are likely many V4 filesystems still around.