linux-kernel - Re: [RFC v7 13/41] richacl: Check if an acl is equivalent to a file mode

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Date:	Tue, 22 Sep 2015 01:20:22 +0200
From:	Andreas Gruenbacher <agruenba@...hat.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-nfs@...r.kernel.org, linux-api@...r.kernel.org,
	linux-cifs@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [RFC v7 13/41] richacl: Check if an acl is equivalent to a file mode

2015-09-17 20:22 GMT+02:00 J. Bruce Fields <bfields@...ldses.org>:
> On Sat, Sep 05, 2015 at 12:27:08PM +0200, Andreas Gruenbacher wrote:
>> ACLs are considered equivalent to file modes if they only consist of
>> owner@, group@, and everyone@ entries, the owner@ permissions do not
>> depend on whether the owner is a member in the owning group, and no
>> inheritance flags are set.  This test is used to avoid storing richacls
>> if the acl can be computed from the file permission bits.
>
> We're assuming here that it's OK for us to silently rearrange an ACL as
> long as the result is still equivalent (in the sense that the permission
> algorithm would always produce the same result).
>
> I guess that's OK by me, but it might violate user expectations in some
> simple common cases, so may be worth mentioning in documentation
> someplace if we don't already.

I've tried to be clear about that in the man pages.

Thanks,
Andreas
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