linux-kernel - Re: [RFC v2 PATCH 0/8] VFS:userns: support portable root filesystems

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Date:	Wed, 4 May 2016 09:34:56 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Djalal Harouni <tixxdz@...il.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>, Chris Mason <clm@...com>,
	tytso@....edu, Serge Hallyn <serge.hallyn@...onical.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andy Lutomirski <luto@...nel.org>,
	Seth Forshee <seth.forshee@...onical.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Dongsu Park <dongsu@...ocode.com>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Miklos Szeredi <mszeredi@...hat.com>,
	Alban Crequy <alban.crequy@...il.com>
Subject: Re: [RFC v2 PATCH 0/8] VFS:userns: support portable root filesystems

On Wed, May 04, 2016 at 04:26:46PM +0200, Djalal Harouni wrote:
> This is version 2 of the VFS:userns support portable root filesystems
> RFC. Changes since version 1:
> 
> * Update documentation and remove some ambiguity about the feature.
>   Based on Josh Triplett comments.

Thanks for the clarifications.

> 3) The existing user namespace interface is the one used to do the
> translation from virtual to on-disk mapping.

This makes sense.  Even if in the future we had a way to supply an
arbitrary VFS UID/GID mapping for a mount, independent of the userns,
what you've proposed would still make sense as a shorthand for the
common case of using the same mapping for both userns and VFS.

- Josh Triplett