linux-kernel - Re: [PATCHSET driver-core-next] sysfs: separate out kernfs, take #3

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Message-ID: <20131124142822.GA17243@htj.dyndns.org>
Date:	Sun, 24 Nov 2013 09:28:22 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	gregkh@...uxfoundation.org, kay@...y.org,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	bhelgaas@...gle.com
Subject: Re: [PATCHSET driver-core-next] sysfs: separate out kernfs, take #3

Hello,

On Sun, Nov 24, 2013 at 01:16:02AM -0800, Christoph Hellwig wrote:
> It would be highly useful if you could explain us what kernfs is
> supposed to do and why we're cheerfully waiting for it.  Also given

Oops, sorry about that.  It was explained in earlier series but I
probably should carry on a simplified explanation on later ones too.
It's just separating out the core features of sysfs into a separate
filesystem so that it can be used by non-kobject based users too.  So,
kernfs implements the core pseudo file functionality and sysfs becomes
kobject-wrapping layer on top of it.  I'm gonna convert cgroup to use
kernfs and Greg seems to have some plans for debugfs, IIUC.

> that you touch VFS core files please Cc linux-fsdevel for those and
> explain them in detail.

Does it?  Ah, okay, fs/Makefile and fs/namespace.c.  The former is
just adding kernfs/ directory and the latter is splitting out
kernfs_init() from sysfs_init() call.  Both are trivial.  Will cc
linux-fsdevel on those patches.

Thanks.

-- 
tejun
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