Re: [Ext2-devel] [RFC] [PATCH 3/4] Add extended attributes to ext2/3

From: Andreas Gruenbacher (
Date: Wed Oct 09 2002 - 06:29:28 EST

On Wednesday 09 October 2002 00:17, Theodore Ts'o wrote:
> On Tue, Oct 08, 2002 at 09:41:43PM +0100, Stephen C. Tweedie wrote:
> > On Tue, Oct 08, 2002 at 08:20:38PM +0100, Christoph Hellwig wrote:
> > > On Tue, Oct 08, 2002 at 09:14:00PM +0200, Andreas Gruenbacher wrote:
> > > > Users might just fill up all xattr space leaving no space for ACLs
> > > > (or similar). If user xattrs are disabled this can no longer occur,
> > > > so some administrators might be happy to have a choice.
> > >
> > > Umm, that's why we have quota..
> >
> > It's the per-inode extended attribute space that's at risk here,
> > quotas don't help.
> Well, how about this as a compromise? We define a new superblock
> field which reserves a certain amount of space in the EA block for
> "system" attributes. The default will be zero, but if we want to
> reserve space for the ACL, we can do that by adjusting the superblock
> field. (I'll add support into tune2fs for that purpose.)
> I'll then remove the CONFIG #ifdef's and the user_xattr mount options.
> (I hate having too many mount options, and this sort of thing should
> be a per-filesystem run-time decision, not a compile-time option.)
> Andreas, does that sound good to you?

I'd rather not store such policy things on the file system permanently, and
make it a mount option. I'm wondering how many installations this would
affect; to me it seems that it's not worth a super block flag.

Eventually we will hopefully move to a more flexible xattr storage mechanism;
that hack will then just become baggage.


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