linux-kernel - Re: [PATCH v11 16/48] richacl: Automatic Inheritance

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Message-ID: <CALCETrXFkB01tk21FuEOqABHWg1XyOQwsT+s=Lq0RYye6X_7xw@mail.gmail.com>
Date:	Fri, 16 Oct 2015 09:00:11 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Andreas Gruenbacher <agruenba@...hat.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Dave Chinner <david@...morbit.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	xfs@....sgi.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v11 16/48] richacl: Automatic Inheritance

On Fri, Oct 16, 2015 at 8:17 AM, Andreas Gruenbacher
<agruenba@...hat.com> wrote:
> Automatic Inheritance (AI) allows changes to the acl of a directory to
> propagate down to children.
>
> This is mostly implemented in user space: when a process changes the
> permissions of a directory and Automatic Inheritance is enabled for that
> directory, the process must propagate those changes to all children,
> recursively.
>
> The kernel enables this by keeping track of which permissions have been
> inherited at create time.  In addition, it makes sure that permission
> propagation is turned off when the permissions are set explicitly (for
> example, upon create or chmod).
>
> Automatic Inheritance works as follows:
>
>  - When the RICHACL_AUTO_INHERIT flag in the acl of a file or directory
>    is not set, the file or directory is not affected by AI.
>
>  - When the RICHACL_AUTO_INHERIT flag in the acl of a directory is set
>    and a file or subdirectory is created in that directory, the
>    inherited acl will have the RICHACL_AUTO_INHERIT flag set, and all
>    inherited aces will have the RICHACE_INHERITED_ACE flag set.  This
>    allows user space to distinguish between aces which have been
>    inherited and aces which have been explicitly added.

What if the file or subdirectory that's created in that directory is a
hard link?

--Andy
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