linux-ext4 - Re: RFC: remove CONFIG_EXT4_FS

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Date:	Thu, 6 Dec 2012 11:26:57 +0100
From:	Jan Kara <jack@...e.cz>
To:	Tao Ma <tm@....ma>
Cc:	Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
	Jan Kara <jack@...e.cz>
Subject: Re: RFC: remove CONFIG_EXT4_FS_XATTR

On Thu 06-12-12 09:33:10, Tao Ma wrote:
> On 12/06/2012 06:35 AM, Theodore Ts'o wrote:
> > 
> > The number of build warnings that were generated with the inline data
> > patch makes me think that perhaps we should just remove
> > CONFIG_EXT4_FS_XATTR.  Turning off CONFIG_EXT4_FS_XATTR causes a net
> > decrease in the ext4 file system by 27k (about 7.3% if ext4 is built as
> > a module; the entire compiled kernel's text+data size for my
> > all-in-one-no-modules-for-kvm-testing is 19 megabytes).
> > 
> > Another advantage of making this change is with the inline data option,
> > if you turn off CONFIG_EXT4_FS_XATTR, it will still allow a file system
> > with inline_data to be mounted, but then attempts to read small files or
> > small directories will end up returning EOPNOTSUPP, which will be
> > surprising to end users in a very serious way.  (Assuming it works at
> > all; I haven't tested to make sure it fails cleanly, and I'm not sure
> > Tao has tested that case either; so easing our test matrix is another
> > reason why removing this config option would be helpful.)
> 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?
  Yes, we enable xattrs in all our kernel configs... BTW +1 from me for
removing the config option.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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