netdev - Re: [PATCH 00/10] sysfs tagged directories

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Date:	Tue, 29 Apr 2008 13:10:06 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Greg KH <gregkh@...e.de>, Benjamin Thery <benjamin.thery@...l.net>,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>,
	Tejun Heo <htejun@...il.com>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>, netdev@...r.kernel.org
Subject: Re: [PATCH 00/10] sysfs tagged directories

"Serge E. Hallyn" <serue@...ibm.com> writes:

> Ah I see it, thanks.

Serge thanks for your productive and detailed reply to this.

> The last question of Al's which went unanswered was
>
>> Excuse me, _what_?  Are you seriously suggesting going through all dentry
>> trees, doing d_move() in each?  I want to see your locking.  It's promising
>> to be worse than devfs had ever been.  Much worse.
>
> I think this is answered in patch 4.  So yeah, it does d_move() in each
> sysfs mount.  It's all done under the sysfs_rename_mutex.  Judging by
> the phrasing of the question, is that not acceptable?

We also have to call sysfs_grab_supers to ensure none of the superblocks
we know about will go away during the rename.  I believe that is the
only locking change from the current code.

Eric
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