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Date: Thu, 14 Mar 2019 11:37:58 +0100
From: aszlig <aszlig@nix.build>
Subject: Re: Failure to execute file on overlayfs during switch_root/chroot
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To: Amir Goldstein <amir73il@gmail.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>, overlayfs <linux-unionfs@vger.kernel.org>, Graham Christensen <graham@grahamc.com>, Samuel Dionne-Riel <samuel@dionne-riel.com>, cleverca22@gmail.com
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On Thu, Mar 14, 2019 at 09:47:23AM +0200, Amir Goldstein wrote:
> Overlayfs is not expected to modify the lower layer.

That is pretty clear, I mean that's the whole point of overlayfs, right? :-)

> OTOH, I can't really think anything that should break horribly if
> we allow overlayfs to update atime on a writable lower layer??

It wasn't using O_NOATIME prior to Linux 4.19 (which is where this was star=
ting
to break our tooling), but the bisected commit I mentioned initially
(a6518f73e60e5044656d1ba587e7463479a9381a) was (implicitly) introducing
O_NOATIME, so to the contrary I'd say it would actually un-break networking
file systems with overlayfs.

a!
--=20
aszlig
Universal dilettante

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