Messages in this thread | | | From | Andreas Dilger <> | Date | Tue, 8 Oct 2002 15:19:36 -0600 | Subject | Re: [Ext2-devel] [RFC] [PATCH 3/4] Add extended attributes to ext2/3 |
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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 http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
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