linux-kernel - Re: [PATCH 2/4] EXT4: Set NOSEC flag early when there are no xattrs

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Date:	Sat, 28 May 2011 07:43:31 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Marco Stornelli <marco.stornelli@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	tytso@....edu
Subject: Re: [PATCH 2/4] EXT4: Set NOSEC flag early when there are no xattrs

On Sat, May 28, 2011 at 11:08:01AM +0200, Marco Stornelli wrote:
> Il 28/05/2011 00:54, Andi Kleen ha scritto:
> >From: Andi Kleen<ak@...ux.intel.com>
> >
> >This avoids a xattr lookup on every write.
> >
> >Cc: tytso@....edu
> >Signed-off-by: Andi Kleen<ak@...ux.intel.com>
> 
> Are ext2/3 affected too? It seems to me that more or less the xattr
> management for the extN series is the same, isn't it?

Yes, they could be changed the same way.

Note however that the file system specific change is only a relatively
minor optimization (avoids the first lookup). The important one is
the cache which every file system get's automatically without changes.

-Andi
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