• Darrick J. Wong's avatar
    xfs: deprecate the V4 format · b96cb835
    Darrick J. Wong authored
    The V4 filesystem format contains known weaknesses in the on-disk format
    that make metadata verification diffiult.  In addition, the format does
    not support dates past 2038 and will not be upgraded to do so.  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.  Dates for these events have been added to
    the upstream kernel.
    Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
    Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
    Reviewed-by: default avatarEric Sandeen <sandeen@redhat.com>
    b96cb835
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