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Date: Mon, 13 Apr 2020 15:02:39 -0400 From: Tejun Heo <tj@...nel.org> To: Christian Brauner <christian.brauner@...ntu.com> Cc: Jens Axboe <axboe@...nel.dk>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org, linux-block@...r.kernel.org, linux-api@...r.kernel.org, Jonathan Corbet <corbet@....net>, Serge Hallyn <serge@...lyn.com>, "Rafael J. Wysocki" <rafael@...nel.org>, "David S. Miller" <davem@...emloft.net>, Saravana Kannan <saravanak@...gle.com>, Jan Kara <jack@...e.cz>, David Howells <dhowells@...hat.com>, Seth Forshee <seth.forshee@...onical.com>, David Rheinsberg <david.rheinsberg@...il.com>, Tom Gundersen <teg@...m.no>, Christian Kellner <ckellner@...hat.com>, Dmitry Vyukov <dvyukov@...gle.com>, Stéphane Graber <stgraber@...ntu.com>, linux-doc@...r.kernel.org, netdev@...r.kernel.org Subject: Re: [PATCH 5/8] kernfs: let objects opt-in to propagating from the initial namespace Hello, On Wed, Apr 08, 2020 at 05:21:48PM +0200, Christian Brauner wrote: > The initial namespace is special in many ways. One feature it always has > had is that it propagates all its devices into all non-initial > namespaces. This is e.g. true for all device classes under /sys/class/ Maybe I'm missing your point but I've always thought of it the other way around. Some namespaces make all objects visible in init_ns so that all non-init namespaces are subset of the init one, which sometimes requires creating aliases. Other namespaces don't do that. At least in my experience, the former is a lot easier to administer. The current namespace support in kernfs behaves the way it does because the only namespace it supports is netns, but if we're expanding it, I think it might be better to default to init_ns is superset of all others model and make netns opt for the disjointing behavior. Thanks. -- tejun
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