Re: [PATCH] ovl: fix timestamp limits

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On Tue, Nov 12, 2019 at 5:48 PM Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
>
> On Mon, Nov 11, 2019 at 8:30 AM Amir Goldstein <amir73il@xxxxxxxxx> wrote:
> >
> > Overlayfs timestamp overflow limits should be inherrited from upper
> > filesystem.
> >
> > The current behavior, when overlayfs is over an underlying filesystem
> > that does not support post 2038 timestamps (e.g. xfs), is that overlayfs
> > overflows post 2038 timestamps instead of clamping them.
>
> How?  Isn't the clamping supposed to happen in the underlying filesystem anyway?
>

Not sure if it is supposed to be it doesn't.
It happens in do_utimes() -> utimes_common()

clamping seems to happen when user sets the times,
so setting the overlay limits to those of upper fs seems
correct anyway.

Thanks,
Amir.



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