linux-kernel - Re: [PATCH] overlayfs: Warn on copy up if a process has a R/O fd open to the lower file

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Message-Id: <1433950405.375893.291973049.101362CB@webmail.messagingengine.com>
Date:	Wed, 10 Jun 2015 11:33:25 -0400
From:	Colin Walters <walters@...bum.org>
To:	David Howells <dhowells@...hat.com>, miklos@...redi.hu,
	viro@...IV.linux.org.uk
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-unionfs@...r.kernel.org
Subject: Re: [PATCH] overlayfs: Warn on copy up if a process has a R/O fd open to
 the lower file

On Thu, May 28, 2015, at 02:46 PM, David Howells wrote:
> Print a warning when overlayfs copies up a file if the process that triggered
> the copy up has a R/O fd open to the lower file being copied up.

Why not an option to make it an error?  If one's goal is to use overlayfs
without apps potentially corrupting data, better to fail fast.
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