linux-kernel - Re: [PATCH] sysfs: add filter function to groups

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Date:	Mon, 29 Oct 2007 12:29:27 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Cornelia Huck <cornelia.huck@...ibm.com>,
	Kay Sievers <kay.sievers@...y.org>, Greg KH <greg@...ah.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sysfs: add filter function to groups

On Mon, 2007-10-29 at 13:27 -0400, Jeff Garzik wrote:
> James Bottomley wrote:
> > visibility and creation are the same thing, aren't they?  An invisible
> > attribute doesn't appear in the sysfs directory, so it's equivalent to
> > the file for it not being created.
> 
> 
> What about the case where it's visible at creation time, but then needs 
> to be made selectively invisible later on?
> 
> That implies either a remove operation or dentry checks on each lookup?

Yes, that comes with the bitmap manipulation code.  There will be a way
to add and remove runtime visibility.  I just wanted to get the basic
concept agreed to first.

James


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