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Re: [Nbd] [RFC 4/4] nbd: Add support for nbd as root device



On Thu, Feb 05, 2015 at 09:23:10AM +0100, Wouter Verhelst wrote:
> [Cc list trimmed]
> 
> On Sat, Jan 31, 2015 at 01:38:21PM +0100, Markus Pargmann wrote:
> > On Fri, Jan 30, 2015 at 06:30:14PM +0100, Wouter Verhelst wrote:
> > > - When a connection is started by nbd-client, the kernel creates a "pid"
> > >   file in sysfs, which contains the PID of the client and which the
> > >   client (when called with -c, or in other cases) uses to verify whether
> > >   a device is connected. At first glance, your patch does not do this,
> > >   which could cause confusion.
> > 
> > I am actually not quite happy to expose the pid of the task that is
> > doing the receive handling through sysfs. As it is already in the code,
> > we can't simply remove it. But I think this should be managed by
> > userspace if it is necessary at some point. It seems like the pid is
> > only used for the connection status?
> 
> In the nbd-client code, that's true.
> 
> However, in case of multiple connected devices and a hung connection, knowing
> which PID corresponds to which device is a useful debugging aid.

I see. Hopefully this is not necessary as soon as the timeout issue is
fixed.

Best regards,

Markus

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