linux-kernel - Re: regarding sysfs/kobject separation

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Message-ID: <m1veasy2v2.fsf@ebiederm.dsl.xmission.com>
Date:	Sun, 02 Sep 2007 19:06:09 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Tejun Heo <htejun@...il.com>
Cc:	Greg K-H <greg@...ah.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: regarding sysfs/kobject separation

Tejun Heo <htejun@...il.com> writes:

> * Automatic symlink handling.  Symlink names can be formatted with the
> name of its target.  e.g. if the symlink name is specified as
> "link-%1:%0" and points to "devices/mybus0/mydev0", its name becomes
> "link-mybus0-mydev0" && the symlink will be automatically renamed when
> the target node or one of its ancestor is moved or renamed.  The symlink
> is also plugged and removed together with its target.  So, once created,
> the user doesn't have to care about the symlink.  sysfs will take care
> of it.

Sounds nice.

> * I think most of the changes wouldn't hinder implementation of tagged
> nodes.  In fact, most of the new rename logic which handles symlink
> rename together is taken from tagged node implementation, so with some
> luck it should be easier to support tagged nodes.

Hopefully.

> *** Future plans.
>
> * Move uevent support over to sysfs and bridging the current users.
> This makes sense because sysfs hierarchy is all that userland can see
> and sysfs users which don't use kobject also needs uevent support.

This could have an interesting interaction with the namespace work.
I think my current implementation only makes these events visible
in the initial network namespace.  But that should change.

Eric
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