posix remove acl support

[Jeremy Allison]

On Wed, Nov 20, 2013 at 11:04:57PM -0600, Steve French wrote:
> Jeremy,
> As you noted we need to add support to cifs kernel client to remove POSIX ACLs.
> 
> This patch is close (it seems to work, but wireshark did not like the
> buffer lengths when I did a setfacl -k although setacl -b looked fine.
> 
> It works basically by passing the minimum size in for the ACL (0
> entries) - sending a zero in the number of ACEs removes the entry.
> 
> Comments/feedback?

Yep, sending a zero size for the number of ACE entries
will delete the ACL on the Samba server side.

I don't have the capability to test your patch right now
though, but you should be able to test it against any
modern Samba server installation.

Jeremy.