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From: Cedric Le Goater <clg@fr.ibm.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	containers@lists.osdl.org
Subject: Re: [patch -mm] update mq_notify to use a struct pid
Date: Mon, 11 Sep 2006 23:53:33 +0200	[thread overview]
Message-ID: <4505DADD.4080007@fr.ibm.com> (raw)
In-Reply-To: <m14pve9qip.fsf@ebiederm.dsl.xmission.com>

Eric W. Biederman wrote:

> Cedric you mentioned a couple of other patches that are in flight.
> In the future could you please Cc: the containers list so independent
> efforts are less likely to duplicate work, and we are more likely
> to review each others patches instead?

yes sure, i was relying on the openvz wiki to avoid duplicated efforts on
this topic but i guess email is just the one and only tool for this kind of
development :)

[ ... ]

>>> Converting that is going to need some sysctl work, so I have been
>>> ignoring it temporarily.
>>>
>>> Filling in a struct pid through sysctl is extremely ugly at the
>>> moment, plus cad_pid needs some locking.
>> Which distros use /proc/sys/kernel/cad_pid and why ? I can image the need
>> but i didn't find much on the topic.
> 
> I'm not at all certain, and I'm not even certain I care.  The concept
> is there in the code so it needs to be dealt with.  

OK. It would be nice to make sure this is still in use before trying to
deal with /proc/sys/kernel/cad_pid.

> Although if I we extend the cad_pid concept it may make a difference.

what do you mean by extending cad_pid ? kill_init() ?

[ ... ]

>> is that about updating the siginfos in collect_signal() to hold the right
>> pid value depending on the pid namespace they are being received ?
> 
> Yes in send_signal, and in collect signal.  To make it work easily I needed
> to add a struct pid to struct sigqueue.  So in send_signal I generate
> the struct pid from the pid_t value and in collect signal I regenerate
> the numeric value.

OK. That's what i imagined also but we need a bit more of the pid namespace
to regenerate the numerical value. So, how will you convert this 'struct
pid*' in a pid value using the current pid namespace ?

thinking aloud :

* if the pid namespace of the sending struct pid and current match,
	use nr.
* if they don't,
	if the sending pid namespace is the ancestor of the current pid
	namespace
		use 0
	else
		it's a bug.

struct pid* needs a pid namespace attribute and pid namespace needs to know
its parent.

C.

  reply	other threads:[~2006-09-11 21:53 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-09-08 16:39 Cedric Le Goater
2006-09-09  2:39 ` Eric W. Biederman
2006-09-11 10:17   ` Cedric Le Goater
2006-09-11 11:09     ` Eric W. Biederman
2006-09-11 14:05       ` Cedric Le Goater
2006-09-11 19:01         ` Eric W. Biederman
2006-09-11 21:53           ` Cedric Le Goater [this message]
2006-09-12  1:22             ` Eric W. Biederman
2006-09-12 15:37               ` Cedric Le Goater
2006-09-12 16:03                 ` Eric W. Biederman
2006-09-12 11:05           ` Herbert Poetzl
2006-09-12 15:14             ` Eric W. Biederman
2006-09-14 20:01             ` [PATCH/RFC] kthread API conversion for dvb_frontend and av7110 Herbert Poetzl
2006-09-14 21:07               ` Cedric Le Goater
2006-09-14 22:10                 ` Herbert Poetzl
2006-11-17  1:50                   ` Andrew de Quincey
2006-11-22 14:56                     ` [Devel] " Cedric Le Goater
2006-11-22 21:32                       ` [v4l-dvb-maintainer] " Andrew de Quincey
2007-01-24 15:47                       ` Cedric Le Goater
2006-12-12 22:58                     ` Eric W. Biederman
2006-12-12 23:13                       ` Herbert Poetzl
2006-12-13 15:55                         ` [Devel] " Cedric Le Goater
2006-09-11 15:48     ` [patch -mm] update mq_notify to use a struct pid Oleg Nesterov

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