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

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Date:	Wed, 31 Oct 2007 11:20:39 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
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

On Wed, 31 Oct 2007 10:52:35 +0100,
Stefan Richter <stefanr@...6.in-berlin.de> wrote:

> 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();
> 

Hm, I find that a bit harder to parse...

mask_out() would also imply that the common use case is to have all
attributes in the group created and that you need to take action to
have an attribute not created.
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