Cannot just call fs/ntfs/aops.c::mark_ntfs_record_dirty() since
        this also marks the page dirty so we create the buffers by hand
        and set them uptodate.
      - Revert the removal of the page uptodate check from
        fs/ntfs/aops.c::mark_ntfs_record_dirty() as it is no longer called
        from fs/ntfs/mft.c::ntfs_sync_mft_mirror().
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>