linux-kernel - Re: [RFC v3 20/45] richacl: Automatic Inheritance

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Message-ID: <CAHpGcM+h6NmJ8F5B+bPAtaNXVeLUiGh-BetpjQLcU_-1Zwbd=Q@mail.gmail.com>
Date:	Thu, 14 May 2015 01:52:52 +0200
From:	Andreas Grünbacher <andreas.gruenbacher@...il.com>
To:	Frank Filz <ffilzlnx@...dspring.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org
Subject: Re: [RFC v3 20/45] richacl: Automatic Inheritance

2015-05-14 0:56 GMT+02:00 Frank Filz <ffilzlnx@...dspring.com>:
> I'm not clear what the RICHACL_PROTECTED flag actually does. It looks like it's
> only tested in chmod, and then only if the mode matches the mask (at least if I'm
> understanding the code right).

User space may propagate automatically inherited permissions to files
which are subject to automatic inheritance (RICHACL_AUTO_INHERIT) and
which are not protected from being modified (RICHACL_PROTECTED).

In richacl_chmod(), we simply detect when a chmod has no effect on the
acl: this is when the file masks are already correct, when the acl is
already masked, and when Automatic Inheritance won't affect the acl.

Andreas
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