Re: [nfsv4] Constructing a NFSv4 ACL from POSIX mode bits

["J. Bruce Fields" <[e-mail]>]

On Tue, Jul 24, 2012 at 03:00:57PM -0500, Nico Williams wrote:
> On Tue, Jul 24, 2012 at 2:33 PM, Haynes, Tom <[e-mail]> wrote:
> > Bruce,
> >
> > In looking at http://tools.ietf.org/html/draft-ietf-nfsv4-acl-mapping-05, it
> > states that when mapping the write bit, only for the owner do we set
> > ACE4_WRITE_ACL.
> >
> > Back in version 00, it is open as to whether we can also set it for the
> > group and other if they have the write bit set.
> >
> > I looked back at the NFSv4 WG aliases and I see some discussion from Lisa
> > on how Solaris only ever sets it for the owner due to POSIX restrictions
> > via chmod(). So, now I know how another server does it.
> 
> This has changed.  I wrote this up here:
> 
> http://cryptonector.com/2011/11/zfs-aclchmod-interactions-in-solaris-11/
> 
> IIRC all ACEs for anything other than OWNER@ (or a user of the same
> name/ID) contribute to the group bits of the mode, the EVERYONE@ entry
> contributes to the world bits of the mode, and the OWNER@ and/or user
> ACEs for the owner name/ID contribute to the owner bits of the mode.
> 
> The new scheme is really much simpler and more natural than everything
> else tried before.

Sounds reasonable.

But Tom was asking above only about ACE4_WRITE_ACL.  And possibly only
in the legacy case.  (Does ZFS have a real ACE4_WRITE_ACL bit?)

--b.