linux-kernel - Re: [PATCH 01/20] sysfs: Implement sysfs_rename

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Date:	Thu, 21 May 2009 03:29:20 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-fsdevel@...r.kernel.org,
	Benjamin Thery <benjamin.thery@...l.net>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>
Subject: Re: [PATCH 01/20] sysfs: Implement sysfs_rename_link

Kay Sievers <kay.sievers@...y.org> writes:

> On Thu, May 21, 2009 at 07:35, Tejun Heo <tj@...nel.org> wrote:
>> Eric W. Biederman wrote:
>>> +int sysfs_rename_link(struct kobject *kobj, struct kobject *targ,
>>> +                     const char *old, const char *new)
>>> +{
>>> +     sysfs_remove_link(kobj, old);
>>> +     return sysfs_create_link(kobj, targ, new);
>>> +}
>>> +
>>
>> Removal and creation are done in the reverse order compared to the one
>> used in device rename.  The important difference is that previously
>> failed operation was noop whereas it now would remove the current
>> link.  I think the old order is correct.
>
> The target string is composed on-demand, and it always points to the
> same kobject and *targ is not needed, right?
>
> Can't we just change the name of the link, instead of removing and
> re-creating the entire thing, and all these issues go away?

Good point.  It looks like I can generalize sysfs_mv_dir into simply
being sysfs_rename.  All of the existing logic looks like it can handle
that.  I will look at doing an incremental patch for that.

Eric
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