[Xen-devel] Re: [RFC PATCH 33/35] Add the Xenbus sysfs and virtual device hotplug driver.

[Greg KH <greg@xxxxxxxxx>]

On Tue, May 09, 2006 at 02:53:14PM -0700, Chris Wright wrote:
> * Greg KH (greg@xxxxxxxxx) wrote:
> > And what are you doing with the different "levels"?  Is there some
> > description of how you are using sysfs for this?  Busses should not be
> > "nested", devices should.  How does sysfs look with this code in it?
> > What is the /sys/bus/ structure?  What is the /sys/devices/ structure?
> 
> e.g.
> 
> /sys/bus/xen
> |-- devices
> |   |-- vbd-51713 -> ../../../devices/xen/vbd-51713
> |   `-- vif-0 -> ../../../devices/xen/vif-0
> `-- drivers
>     `-- vbd
>         |-- bind
>         |-- unbind
>         `-- vbd-51713 -> ../../../../devices/xen/vbd-51713
> 
> /sys/devices/xen
> |-- uevent
> |-- vbd-51713
> |   |-- block:xvda1 -> ../../../block/xvda1
> |   |-- bus -> ../../../bus/xen
> |   |-- devtype
> |   |-- driver -> ../../../bus/xen/drivers/vbd
> |   |-- nodename
> |   `-- uevent
> `-- vif-0
>     |-- bus -> ../../../bus/xen
>     |-- devtype
>     |-- nodename
>     `-- uevent

<snip>

> > What is the "frontend/backend" relationship here?
> 
> do you mean in sysfs?  or more in general?

Either.  You seem to mention a lot of nested depths in sysfs or "files",
yet your above tree doesn't show that.  And I don't understand what you
mean by frontend/backend here either?  Is it a sysfs thing?  Or a Xen
thing?

thanks,

greg k-h

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