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[nfsv4] Re: Our different approaches to draft POSIX ACL support in NFSv4

Chuck Lever III <chuck.lever@oracle.com> Wed, 24 July 2024 14:59 UTC

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From: Chuck Lever III <chuck.lever@oracle.com>
To: David Noveck <davenoveck@gmail.com>
Thread-Topic: [nfsv4] Our different approaches to draft POSIX ACL support in NFSv4
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Date: Wed, 24 Jul 2024 14:59:20 +0000
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Subject: [nfsv4] Re: Our different approaches to draft POSIX ACL support in NFSv4
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Hi -

> On Jul 24, 2024, at 8:43 AM, David Noveck <davenoveck@gmail.com> wrote:
> 
> Rick has discussed the possibility of a v4.2 extension but using new attributes has not committed to writing it up.   I'm worried that he might lose interest given the possibility of IP horrors, but I really don't know. From my point of view, the weakness in Rick's approach is that it does not address migration and coexistence issues.  I think that is essential given the history here but many files with ACLs exist on file systems and I think it's important to address the issues of how the existing model and a new one will interact.

Hence my concern about how POSIX ACLs might appear to clients
that access them via NFSv3's NFSACL versus how they might
appear to clients that access them via a putative NFSv4 POSIX
ACL facility. NFSv3 remains a widely-deployed protocol and I
believe users would be surprised if there were compatibility
issues.

If there are no issues here, great! If there are, IMO new
documents should help implementers and users understand and
cope with any differences.

Given that you believe "it's important to address the issues
of how the existing model and the new one interact" I hope
you will provide some guidance in this area in acls-0? or
follow-on documents. :-)


--
Chuck Lever

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