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

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Message-ID: <ac3eb2510905210306o48bdf4c8rf7459b35aa521998@mail.gmail.com>
Date:	Thu, 21 May 2009 12:06:18 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	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

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?

Thanks,
Kay
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