linux-kernel - Re: [PATCH 5/7] SELinux: Handle opening of a unioned file

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Message-ID: <787.1415280868@warthog.procyon.org.uk>
Date:	Thu, 06 Nov 2014 13:34:28 +0000
From:	David Howells <dhowells@...hat.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>
Cc:	dhowells@...hat.com, linux-unionfs@...r.kernel.org,
	selinux@...ho.nsa.gov, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] SELinux: Handle opening of a unioned file

Stephen Smalley <sds@...ho.nsa.gov> wrote:

> Not sure what filesystems you have in mind for the unionmount scenario.

Currently any filesystem that can be used for a unionmount top layer has to be
modified to provide certain things (DT_WHITEOUT and DT_FALLTHRU directory
entry creation) - and the way this is done precludes a number of filesystems
from being used (it modifies the on-disk format).

Whiteout creation is being provided by some filesystems for overlayfs - but in
a different way to unionmount (0,0 chardevs rather than DT_WHITEOUT dirents).

David
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