On Fri, Sep 11, 2020 at 09:43:11AM -0700, Darrick J. Wong wrote: > From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > > The V4 filesystem format contains known weaknesses in the on-disk format > that make metadata verification diffiult. In addition, the format will > does not support dates past 2038 and will not be upgraded to do so. > Therefore, we should start the process of retiring the old format to > close off attack surfaces and to encourage users to migrate onto V5. > > Therefore, make XFS V4 support a configurable option. For the first > period it will be default Y in case some distributors want to withdraw > support early; for the second period it will be default N so that anyone > who wishes to continue support can do so; and after that, support will > be removed from the kernel. > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > --- > v3: be a little more helpful about old xfsprogs and warn more loudly > about deprecation > v2: define what is a V4 filesystem, update the administrator guide > --- > Documentation/admin-guide/xfs.rst | 23 +++++++++++++++++++++++ > fs/xfs/Kconfig | 24 ++++++++++++++++++++++++ > fs/xfs/xfs_super.c | 13 +++++++++++++ > 3 files changed, 60 insertions(+) I agree with the overall policy direction and that we should be warning v4 filesystem users as early as possible. Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx> -- Dave Chinner david@xxxxxxxxxxxxx
