linux-kernel - Re: [PATCH 1/2] cgroup allow subsys to set default mode of its own file

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Message-ID: <20090225080307.GD11421@balbir.in.ibm.com>
Date:	Wed, 25 Feb 2009 13:33:07 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"containers@...ts.linux-foundation.org" 
	<containers@...ts.linux-foundation.org>,
	"menage@...gle.com" <menage@...gle.com>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] cgroup allow subsys to set default mode of its own
	file

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-02-25 16:35:55]:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> cgroup's subsys has "readonly" files, but default permission is always
> rw-r--r--. This allows to create r--r--r-- file to subsys.
> (The user can do chmod on this read-only file. But this behavior is not
>  different from current pseudo file systems as /proc.)
> 
> Reason:
>  When I wrote tools for maintain cgroup, I can't find which file is
>  writable intarfece or not via cgroup file systems. (finally, I did
>  dirty approach.)
>  IMHO, showing "this file is read-only" in explicit way is useful
>  for user-land (tools). In other story, a file whose name sounds read-only
>  may have "trigger" operation and support reseting. In this case,
>  "writable" is informative.

Perfect, Thanks, Looks good to me

-- 
	Balbir
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