NFS ACL compatibility [was: Re: [2.6] The List, pass #2]

From: Mikael Pettersson (
Date: Thu Aug 01 2002 - 06:03:23 EST

On Thu, 1 Aug 2002 10:34:23 +1000 (EST), Neil Brown wrote:
>Well, given that the protocol specification isn't 100% finalised, it's
>not clear that pushing for inclusion now is entirely sensible. We
>don't want people to be using an NFSv4 on Linux that is incompatible
>in some subtle way with other vendors.
>Also, I suspect that NFSv4 will be fairly localised in the changes it
>makes and could well go in to 2.6.10 of whatever (afterall, reiserfs
>went in at 2.4.2).
>There are some changes that NFSv4 would like to make that affect
>common code, such as making open(,O_EXCL) work for a networked
>filesystem, but we can live without that (as we do with NFSv3), but
>hopefully that functionality will get in before halloween anyway.

Speaking of NFS compatibility: can Linux' NFS server implement ACLs
in a way that's compatible with Solaris NFS clients?

A sysadmin over here says this isn't the case, because Sun apparently
stepped outside of the NFSv3 protocol and handles ACLs with a
separate RPC program.

The significance of this is that unless Linux' NFS server can be made
fully compatible with Solaris NFS clients, we can't use Linux for the
new high-performance NFS servers we need to install this fall, forcing
us to go with Solaris and fairly expensive Sun HW.

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