linux-ext4 - Re: richacl(7) man page review comments

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Date:	Sun, 21 Feb 2016 22:01:25 +0100
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Andreas Gruenbacher <agruenba@...hat.com>
Cc:	mtk.manpages@...il.com, "J. Bruce Fields" <bfields@...ldses.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	XFS Developers <xfs@....sgi.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	linux-cifs@...r.kernel.org, Linux API <linux-api@...r.kernel.org>,
	Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Jeff Layton <jlayton@...chiereds.net>,
	Andreas Dilger <adilger@...ger.ca>
Subject: Re: richacl(7) man page review comments

On 02/20/2016 05:37 PM, Andreas Gruenbacher wrote:
> Hi Michael,
> 
> thanks again for all the feedback. I've followed all your suggestions;
> again, please see the github repo for the latest version:
> 
>   https://github.com/andreas-gruenbacher/richacl
> 
> On Sun, Feb 14, 2016 at 10:31 PM, Michael Kerrisk (man-pages)
> <mtk.manpages@...il.com> wrote:
>> Hi Andreas,
>>
>> Here's a few more comments on the current richacl(7) page
>> that I fetched from the git repo.
>>

[...]

>>> .HP
>>> .BR dir_inherit "\ (" d ):
>>> The entry is inheritable for directories.
>>
>> "When this flag appears in the ACL entry of a directory, then that entry is
>> inherited by new subdirectories created in the directory."
>>
>> Is that text that I propose correct?
> 
> It's not entirely wrong, but only a small part of the truth. Entries
> are inherited such that the permissions in file_inherit entries become
> effective for access checking for new files, and the permissions in
> dir_inherit entries become effective for access checking for new
> directories, recursively.
> 
> Your feedback prompted me to look into the inheritance flag
> computation more closely once again, and I found bugs. The steps of
> the algorithm are explained in the section "Permissions at
> file-creation time", by the way.

Hmmm... writing and refining documentation helps find code bugs. 
Who knew? :-)

Cheers,

Michael

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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