[PATCH RESEND] ubifs: Introduce a mount option of force_atime.

[Artem Bityutskiy]

On Fri, 2015-06-26 at 15:52 +0800, Dongsheng Yang wrote:
> 
> Yes, it's only used in util-linux now. But do you think it's weird
> that:
> -o atime - no atime (we treat it as the default behavior)
> -o noatime - no atime

Yes, it is, and worse, this is inconsistent with other file-systems,
e.g., ext4. So I think I am convinced that with UBIFS_ATIME_SUPPORT
we'll end up with a better overall result.