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

From: Andreas Dilger (
Date: Tue Oct 08 2002 - 16:19:36 EST

On Oct 08, 2002 21:47 +0100, Christoph Hellwig 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, that's a more important problem. But I doubt a hack to just turn off
> user xattrs is the right fix then. A static reservation for ACLs or just
> totally separating them (like in XFS) seems more m?ture.

Yes, we have made proposals in the past to change the way ext2/3 EAs are
stored on disk, but nobody has had time to work on it yet. The current
limitations of 4kB of EA per inode (user+system) is bad, as is the fact
that you need a full block for each inode if you have any unique
per-inode data (basically anything other than ACLs).

That said, the benefits of the current EA implementation far outweigh the
limitations, and since this is an internal-to-ext2/3 issue, we can
change it at some later date without affecting the rest of the kernel.

Cheers, Andreas

Andreas Dilger

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