From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.kundenserver.de (mout.kundenserver.de [217.72.192.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7BA65173 for ; Mon, 14 Jun 2021 07:49:55 +0000 (UTC) Received: from [192.168.1.155] ([95.115.71.85]) by mrelayeu.kundenserver.de (mreue106 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MqJZl-1lW3zE1cfr-00nQqE; Mon, 14 Jun 2021 09:49:23 +0200 Subject: Re: device namespaces To: "Eric W. Biederman" , Christian Brauner Cc: Hannes Reinecke , gregkh@linuxfoundation.org, containers@lists.linux.dev, linux-kernel@vger.kernel.org References: <9157affa-b27a-c0f4-f6ee-def4a991fd4e@suse.de> <20210608142911.ievp2rpuquxjuyus@wittgenstein> <877dj4ff9g.fsf@disp2133> <20210609063818.xnod4rzvti3ujkvn@wittgenstein> <20210609072108.ldhsxfnfql4pacqx@wittgenstein> <85a0d777-dea6-9574-8946-9fc8f912c1af@suse.de> <20210609080918.ma2klvxkjad4pjrn@wittgenstein> <87v96k1d65.fsf@disp2133> From: "Enrico Weigelt, metux IT consult" Message-ID: Date: Mon, 14 Jun 2021 09:49:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 X-Mailing-List: containers@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <87v96k1d65.fsf@disp2133> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: tl Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K1:vDcC/6vJGgs0xNiN8kqUu/HqX+nxu78r6MTjnn+RaYLuzq9x4kM 3AyrUtiJ4LfMoeezJW1RUrxpG3wlUPedT8vY7Posz4/koSgZ3bkxlF7O/vds1Zss5qK7a75 aN96WycM772iK8O5+zblLAgmJrH947YEJwxNEzqiq7iP+ruA4XFHBmRiLMbgWvPW0Be3rrj MH4E5Y49mVP4cmczWyz3g== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:doK3sJdxH9U=:XMd3gz1LgI4ifBd/cLxrAS RLRlLPtxMnFJxzMHKxJPACZ9b+ex+7B7ul616LdwW1mrQshlwvpwnFbWqWZCcbb6eVhvE8MB2 yxokDoMeqAmfyDW/xCHel32Q1ejOU3cSrBYgbj24tFqnjhqDOhCf+fbwSnsJMQpeV/EoU8Rhk c4yEge2gIidmm7SP+tQX5jbqSo8ah5czMjDUJyJs2n9mhXsr0K/yVeICvbDKlh3MaECOAcf7N m7fv6+e9Tg43z+kazu4lT0KC7eqie4KygXdMLYQ7FBUzWw8N1xOMFkA7fW2gc9wfUXUctaq4J jZp3h90Zf2MhGixNNKjDshLXzTEfs5Mra7Xpx5QhXmw6FvCXSKsi7ofMGpLKZXKXtke+++O7/ nVIddDzBsCE8/TrJXxDL1RZzLhgg99BqI1U+RDJ0Bkrfd7AT2D7DkLLoIevLkd+MJ76Fj7VJO ifNxLd8TuLl8xZVu2GJNKIqWQ5ZXC1f2HD3IWbrMenBD9z1AKp9H2yudk4b6OP5obqYJAPNLL 3CsFvBWxmq2DSrwrB+49Gk= On 11.06.21 20:14, Eric W. Biederman wrote: Hi, > I favor none of the virtual devices showing up in sysfs. Maybe existing > userspace needs the devices in sysfs, but if the solution is simply to > skip sysfs for virtual devices that is much simpler. Sorry for being a little bit confused, but by virtual devices you mean things like pty's or all the other stuff we already see under /sys/device/virtual ? I'm yet unsure what the better way is. If we're just talking about pty's specifically, I maybe could live with threating them like "special sort of pipes", but I guess that would require some extra magic. If I'm not mistaken, the whole sysfs stuff is automatically handled device classes and bus'es - seems that tty's are also class devs. How would you skip the virtual devices from sysfs ? Adding some filter into sysfs that looks at the device class (or some flag within it) ? --mtx -- --- Hinweis: unverschlüsselte E-Mails können leicht abgehört und manipuliert werden ! Für eine vertrauliche Kommunikation senden Sie bitte ihren GPG/PGP-Schlüssel zu. --- Enrico Weigelt, metux IT consult Free software and Linux embedded engineering info@metux.net -- +49-151-27565287