Re: some simple questions about sysfs

[Greg KH <greg@xxxxxxxxx>]

On Fri, Mar 02, 2007 at 10:27:46AM -0500, Robert P. J. Day wrote:
> On Thu, 1 Mar 2007, Greg KH wrote:
> 
> > Simple?  Are you crazy?
> 
> my emotional stability has nothing to do with this.  try to focus,
> greg. :-P

Heh.

> > >   i'm trying to clarify the interconnection between all of the sysfs
> > > structures, so a few questions:
> > >
> > > 1) is it true that an entry exists at the top of the sysfs if and only
> > > if it is a subsystem?  there's no notion of a lower-level subsystem,
> > > is there?  that is, subsystems aren't defined recursively.
> >
> > No, you can create an entry at the top if you use a kobject with no
> > parent.
> 
> ah, now that wasn't obvious from any explanation i've read.  so if you
> look at a subsystem structure, it has a "kset" member, whose internal
> "kobject" represents its position in the sysfs hierarchy.  and it's
> that internal kobject that represents a subsystem's position in the
> hierarchy, is that it?

Yes, that is correct.

> in short, ksets and subsystems themselves are examples of "kobjects"
> which define their position in the tree.  ok, that definitely clears
> things up a bit, and explains how subsystems can exist further down
> the tree.
> 
> more later after i do more reading.

What specifically are you trying to figure out here?

thanks,

greg k-h

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