Re: device namespaces

[Hannes Reinecke]

On 6/9/21 8:38 AM, Christian Brauner wrote:
> On Tue, Jun 08, 2021 at 12:16:43PM -0500, Eric W. Biederman wrote:
> > Hannes Reinecke <hare@xxxxxxx> writes:
> >
> > > On 6/8/21 4:29 PM, Christian Brauner wrote:
> > > > On Tue, Jun 08, 2021 at 04:10:08PM +0200, Hannes Reinecke wrote:
[ .. ]
> > > Granted, modifying sysfs layout is not something for the faint-hearted,
> > > and one really has to look closely to ensure you end up with a
> > > consistent layout afterwards.
> > >
> > > But let's see how things go; might well be that it turns out to be too
> > > complex to consider. Can't tell yet.
> >
> > I would suggest aiming for something like devptsfs without the
> > complication of /dev/ptmx.
> >
> > That is a pseudo filesystem that has a control node and virtual block
> > devices that were created using that control node.
>
> Also see android/binder/binderfs.c
Ah. Will have a look.

> > That is the cleanest solution I know and is not strictly limited to use
> > with containers so it can also gain greater traction.  The interaction
> > with devtmpfs should be simply having devtmpfs create a mount point for
> > that filesystem.
> >
> > This could be a new cleaner api for things like loopback devices.
>
> I sent a patchset that implemented this last year.
Do you have a pointer/commit hash for this?

Cheers,

Hannes
--
Dr. Hannes Reinecke                Kernel Storage Architect
hare@xxxxxxx                              +49 911 74053 688
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