fs/ntfs/aops.c::ntfs_writepage() and ntfs_commit_write() use it, thus
        finally enabling resident file overwrite!  (-8  This also includes a
        placeholder for ->writepage (ntfs_mft_writepage()), which for now
        just redirties the page and returns.  Also, at umount time, we for
        now throw away all mft data page cache pages after the last call to
        ntfs_commit_inode() in the hope that all inodes will have been
        written out by then and hence no dirty (meta)data will be lost.  We
        also check for this case and emit an error message telling the user
        to run chkdsk.
      - If the user is trying to enable (dir)atime updates, warn about the
        fact that we are disabling them.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>