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List:       linux-fsdevel
Subject:    RE: JFS extended attributes and ACLs - New Patches
From:       Luka Renko <luka.renko () hermes ! si>
Date:       2002-09-10 7:40:03
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> On Monday 09 September 2002 10:02, Andreas Gruenbacher wrote:
> 
> > Extended user attributes should be allowed only for regular 
> files and 
> > for directories with the sticky bet cleared. Rationale: See the
> > attr(5) manual page.
> 
> Hmm.  If different policies are to be applied to the different 
> namespaces, I think it would be a good thing to move that 
> policy to the 
> vfs layer, rather than have each filesystem redundantly enforce these 
> policies.
> 
> If the VFS is requesting that an extended attribute be set, the 
> filesystem-specific code should be able to assume it's allowed.  I've 
> tried to keep the JFS code simple.  It really doesn't care 
> and doesn't 
> want to care about namespaces.  I've special cased the 
> setting of acl's 
> to make sure the permissions get set correctly, but I'd prefer this 
> happened at a higher level as well.

I think that is the right solution. FS should not care about namespaces and
potential limitations they should just provide storage for EA.

I anyway do not like the fact that EA functionality is limited for different
type of files. 
If the only limitation is quata system, then we may just have a additional
mount option to support EA on any file type - this way user can select what
they want to have (strict quota or EA on special files and symbolic links).

Regards,
Luka
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