linux-kernel - Re: kdbus: add code to gather metadata

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Message-ID: <CALCETrVkuKxMMEw3HBEOZoFUuw8PndXtB13+bLWmcp_E34SaFw@mail.gmail.com>
Date:	Wed, 29 Oct 2014 17:13:34 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Linux API <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Tejun Heo <tj@...nel.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	Ryan Lortie <desrt@...rt.ca>,
	Bastien Nocera <hadess@...ess.net>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Simon McVittie <simon.mcvittie@...labora.co.uk>,
	daniel@...que.org, alban.crequy@...labora.co.uk,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Tom Gundersen <teg@...m.no>
Subject: Re: kdbus: add code to gather metadata

On Wed, Oct 29, 2014 at 3:33 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Wed, Oct 29, 2014 at 3:00 PM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
>> From: Daniel Mack <daniel@...que.org>
>>
>> A connection chooses which metadata it wants to have attached to each
>> message it receives with kdbus_cmd_hello.attach_flags. The metadata
>> will be attached as items to the messages. All metadata refers to
>> information about the sending task at sending time, unless otherwise
>> stated. Also, the metadata is copied, not referenced, so even if the
>> sending task doesn't exist anymore at the time the message is received,
>> the information is still preserved.
>>

Also, in general, the comments seem to talk about capturing metadata
at the time that a connection is opened, but the actual code seems to
capture metadata all over the place.  I think it needs to be very
clear, both in the code and the interface, when metadata is captured.

And the ns_eq stuff is too far buried (and not even contained in this
patch!) to be easily verified as being correct, whatever correct means
in that context.

--Andy
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