Re: POSIX ACL support for NFSV4 (using sideband protocol)

From: "J. Bruce Fields" <bfields@fieldses.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: linux-nfs@vger.kernel.org, trond.myklebust@netapp.com,
	nfsv4@linux-nfs.org, sfrench@us.ibm.com, agruen@suse.de
Subject: Re: POSIX ACL support for NFSV4 (using sideband protocol)
Date: Wed, 2 Sep 2009 12:42:43 -0400	[thread overview]
Message-ID: <20090902164243.GA17126@fieldses.org> (raw)
In-Reply-To: <1251894268-1555-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com>

On Wed, Sep 02, 2009 at 05:54:20PM +0530, Aneesh Kumar K.V wrote:
> This patch series implement POSIX ACL support for NFSV4 clients
> using sideband protocol.

What motivates this?  Who exactly wants this and why?   What would be
the advantages compared to other options, such as:

	- native v4 support in filesystems, or
	- improved client-side acl tools that provided a user interface
	  for v4 acls closer to that for v3 acls, or
	- a v4.x extension to add support to the main protocol?

Is there interest in implementing this on any OS other than linux, or
would this be a linux-only extension for the forseeable future?

What sideband protocol exactly?  If it's exactly the same protocol as
the one used with v3, there must be some slight mismatches: e.g. v4
filehandles are allowed to be longer.  How do you deal with these?

--b.

> The ACL support can be disabled/enabled
> using -o noacl/-o acl mount option. The feature enables to
> view and  modify POSIX acls from NFSv4 client.
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