linux-kernel - Re: [PATCH 0/6] overlayfs + casefolding

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Message-ID: <6lveeao4ensfyaj4zzvyxaqhzybzbnzlk3fhae5sb2ejtzzquw@2cy3fuliwh5l>
Date: Tue, 20 May 2025 12:49:00 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Miklos Szeredi <miklos@...redi.hu>
Cc: Amir Goldstein <amir73il@...il.com>, linux-fsdevel@...r.kernel.org, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, linux-unionfs@...r.kernel.org, 
	Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 0/6] overlayfs + casefolding

On Tue, May 20, 2025 at 06:40:35PM +0200, Miklos Szeredi wrote:
> On Tue, 20 May 2025 at 17:21, Kent Overstreet <kent.overstreet@...ux.dev> wrote:
> 
> > Docker mounts the image, but then everything explodes when you try to
> > use it with what look to the user like impenetrable IO errors.
> >
> > That's a bad day for someone, or more likely a lot of someones.
> 
> Wouldn't it be docker's responsibility to know that that won't work
> with overlayfs?

Why would it be?

> Any error, whether at startup or during operation is not something the
> user will like.
> 
> What am I missing?

A _mount_ error due to misconfiguration is expected operation, and we've
built mechanisms for reporting those errors in a way that users can
understand what's going on.

That's not true for normal file accesses post mount.