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Message-ID: <20071031112039.0b067ce3@gondolin.boeblingen.de.ibm.com>
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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