linux-kernel - Re: 45aebeaf4f67 "ovl: Ensure upper filesystem supports d

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Message-ID: <CAJfpeguDRps94_NYXSjc7gtO7OYMU-BEwU3nqp8XABtZ5Cftcg@mail.gmail.com>
Date:	Tue, 17 May 2016 16:24:43 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Miklos Szeredi <mszeredi@...hat.com>,
	Daniel Axtens <dja@...ens.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"linux-unionfs@...r.kernel.org" <linux-unionfs@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mpe@...erman.id.au, dchinner@...hat.com
Subject: Re: 45aebeaf4f67 "ovl: Ensure upper filesystem supports d_type"
 breaking Docker

On Tue, May 17, 2016 at 2:10 PM, Vivek Goyal <vgoyal@...hat.com> wrote:

> Having said that, what happens when ovl_workdir_create() fails and we
> mount overlayfs read only. In that case I think we will conclude that
> underlying fs does not support d_type and mounting will fail.

Good point, I missed that.

> Any thoughts, on how to handle this failure path better?

Just skip the d_type test.  We won't create whiteouts that way (and
whiteouts would only have been created with a previous kernel that
didn't have this test, which I don't think is a very interesting
case).

Thanks,
Miklos