linux-kernel - Re: [PATCH 0/5][V2] FS: userspace notification of errors

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Message-ID: <ac3eb2510906110943r4af7a1baue3a8e6bc12b16f2d@mail.gmail.com>
Date:	Thu, 11 Jun 2009 18:43:46 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	Denis Karpov <ext-denis.2.karpov@...ia.com>,
	hirofumi@...l.parknet.co.jp, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, adrian.hunter@...ia.com,
	artem.bityutskiy@...ia.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 0/5][V2] FS: userspace notification of errors

On Thu, Jun 11, 2009 at 18:41, Jamie Lokier<jamie@...reable.org> wrote:
> Kay Sievers wrote:
>> No, the objection was to use the underlying *device* as the source to
>> raise filesystem events. I don't think there are problems in general
>> with objects in /sys/fs/ sending events.
>>
>> But, the remaining questions here are:
>> Do we really want superblocks exported in the global,
>> non-namespace-aware /sys? It might be wrong to export stuff from other
>> namespaces for filesytems which are irrelevant, and not even visible.
>> I'm not sure about this, and it needs careful evaluation. We once had
>> filesystem mount/umount uevents on block devices, and we needed to
>> remove them for that namespace reason.
>
> Is there no namespace awareness in /sys?

No, not at all. It is the straight export of the core kernel objects.

> So how do namespaced guests deal with not having access to /sys, given
> modern distros make extensive use of it?

They ignore it and don't use it, or get confused, I guess. :)

Thanks,
Kay
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