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Date:	Tue, 6 Oct 2015 15:12:36 +0200
From:	Andreas Gruenbacher <>
To:	Christoph Hellwig <>
Cc:	Austin S Hemmelgarn <>,
	Alexander Viro <>,
	"Theodore Ts'o" <>,
	Andreas Dilger <>,
	"J. Bruce Fields" <>,
	Jeff Layton <>,
	Trond Myklebust <>,
	Anna Schumaker <>,, LKML <>,
	linux-fsdevel <>,,
Subject: Re: [PATCH v8 00/41] Richacls

On Tue, Oct 6, 2015 at 11:49 AM, Christoph Hellwig <> wrote:
> On Mon, Oct 05, 2015 at 02:58:36PM -0400, Austin S Hemmelgarn wrote:
>> I think the point is that a new VFS feature that is easy to integrate in
>> multiple filesystems should have support for those filesystems.  A decade
>> ago, just having ext* support would probably have been fine, but these days,
>> XFS, BTRFS, and F2FS are used just as much (if not more) on production
>> systems as ext4, and having support for them right from the start would
>> significantly help with adoption of richacls.
> That's one reason.  The other is that actually wiring it up for more
> than a single consumer shows its actually reasonable generic.

The filesystem interface now is the same as for POSIX ACLs, used by a
dozen or so filesystems already.

>  I don't want to end up with a situration like Posix ACLs again where
> different file systems using different on disk formats again.

Any file system could choose a different on-disk format than the one
that ext4 currently uses, but I don't see a reason why any should.
Apart from uid / gid mappings that is the same as the user-space xattr
format. Network file systems like NFSv4 and CIFS with their predefined
over-the-wire formats obviously are another story.

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