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

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Message-ID: <47285063.1040508@s5r6.in-berlin.de>
Date:	Wed, 31 Oct 2007 10:52:35 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
CC:	Greg KH <greg@...ah.com>,
	James Bottomley <James.Bottomley@...elEye.com>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sysfs: add filter function to groups

Cornelia Huck wrote:
> Greg KH <greg@...ah.com> wrote:
>> On Tue, Oct 30, 2007 at 01:25:43PM -0500, James Bottomley wrote:
>>> +	for (i = 0, attr = grp->attrs; *attr; i++, attr++)
>>> +		if (grp->is_visible &&
>>> +		    grp->is_visible(kobj, *attr, i))
>>> +			sysfs_hash_and_remove(dir_sd, (*attr)->name);
>> Hm, doesn't this break for the zillions of attribute groups that do not
>> have the is_visible function set?
...
> Would it make more sense then to turn the meaning of the callback
> around?
> 
> for (...) {
> 	if (grp->mask_out && grp->mask_out(kobj, *attr, i))
> 		continue;
> 	error |= sysfs_add_file(...);
> }

		if (!grp->is_visible ||
		    grp->is_visible(kobj, *attr, i))
			add or remove();

-- 
Stefan Richter
-=====-=-=== =-=- =====
http://arcgraph.de/sr/
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