[Samba] acl_xattr vs acl_tdb

[simo]

On Fri, 2010-03-26 at 12:28 -0400, simo wrote:
> On Fri, 2010-03-26 at 10:53 -0400, simo wrote:
> > On Fri, 2010-03-26 at 13:06 +0000, Miguel Medalha wrote:
> > > > If I remember correctly XFS used to have a size limit of 64KiB per
> > > > xattr.
> > > >    
> > > 
> > > What about ext3 & ext4?
> > 
> > Always IIRC, they should be limited by the inode size, which is 4KiB,
> > but this information is old, and should be verified for ext4.
> 
> Ok I just checked.
> On ext4 the total size of *all* xattrs can't be larger than 4k and some.
> 
> There is only 1 block you can allocate beyond the file inode.
> 
> So careful on the amount of data you store in ext4 attrs. If you think
> you'll have fatty Windows ACLs to store I guess XFS is a better choice
> right now.

Ah just to add insult to injury, remember that the xattr space is shared
with selinux labels *and* posix ACLs contents.

So it is a tight spot indeed.

Simo.

-- 
Simo Sorce
Samba Team GPL Compliance Officer <simo at samba.org>
Principal Software Engineer at Red Hat, Inc. <simo at redhat.com>