linux-ext4 - Re: RFC: remove CONFIG_EXT4_FS

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Date:	Thu, 6 Dec 2012 11:28:04 -0800
From:	David Brown <davidb@...eaurora.org>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Tao Ma <tm@....ma>, linux-ext4@...r.kernel.org,
	Jan Kara <jack@...e.cz>
Subject: Re: RFC: remove CONFIG_EXT4_FS_XATTR

On Wed, Dec 05, 2012 at 10:48:42PM -0500, Theodore Ts'o wrote:
> On Thu, Dec 06, 2012 at 09:33:10AM +0800, Tao Ma wrote:
> > To be frank, I didn't try the inline data test without xattr support. So
> > that would be great if we remove it. :)
> > 
> > btw, does any distribution disable xattr support during kernel build? As
> > Eric said on behalf of redhat, and in my ubuntu box xattr is enabled.
> > Would Jan confirm that SUSE also use it by default?
> 
> I'm pretty sure SuSE enables it, since SELinux requires it, and SuSE
> supports it.
> 
> I'm more concerned with various embedded use cases, which is why I
> measured how much additional text/data space xattr support enables
> (which was only 27k, so I doubt that would be an issue in most
> embedded use cases --- hmm.... I've just checked a Nexus 4 kernel
> config and it enables CONFIG_FS_EXT4_XATTR; I'm not sure Android is
> actually using xattrs at all at the moment, but it's certainly
> enabled).

As far as I know, it's enabled in all Android kernels that use ext4.
(at least once I grepped for CONFIG_EXT4_FS_XATTR)

Arch linux has started using capabilities in some packages, which will
also require this.

David

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