linux-kernel - Re: [PATCH 15/18] fs: introduce a per-cpu last

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Message-ID: <20101008101921.GD19804@ZenIV.linux.org.uk>
Date:	Fri, 8 Oct 2010 11:19:21 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Dave Chinner <david@...morbit.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/18] fs: introduce a per-cpu last_ino allocator

On Fri, Oct 08, 2010 at 12:09:44PM +0200, Andi Kleen wrote:

> > Can be done if you bother to add ->getattr() for those, but you'll need
> > to do some kind of lazy allocation of inumbers for those; fstat() _will_
> > want st_ino.
> 
> Why not just put 0 in st_ino for sockets/pipes/etc. ? 

Because it's a userland-visible change; right now you can compare
i_ino for sockets...
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