linux-kernel - Re: [PATCH 4/9] syslog_ns: make syslog handling per namespace

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Date:	Thu, 01 Aug 2013 13:38:26 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	Rui Xiang <rui.xiang@...wei.com>
CC:	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, serge.hallyn@...ntu.com,
	ebiederm@...ssion.com, akpm@...ux-foundation.org,
	libo.chen@...wei.com
Subject: Re: [PATCH 4/9] syslog_ns: make syslog handling per namespace

On 08/01/2013 11:10 AM, Rui Xiang wrote:
> On 2013/8/1 9:36, Gao feng wrote:
>> On 07/29/2013 10:31 AM, Rui Xiang wrote:
>>> This patch makes syslog buf and other fields per
>>> namespace.
>>>
>>> Here use ns->log_buf(log_buf_len, logbuf_lock,
>>> log_first_seq, logbuf_lock, and so on) fields
>>> instead of global ones to handle syslog.
>>>
>>> Syslog interfaces such as /dev/kmsg, /proc/kmsg,
>>> and syslog syscall are all containerized for
>>> container users.
>>>
>>
>> /dev/kmsg is used by the syslog api closelog, openlog, syslog, vsyslog,
>> this should be per user namespace, but seems in your patch,
> 
> Yes, /dev/kmsg is per user namespace, and per syslog ns, too.
> 
>> the syslog message generated through these APIs on host can be exported
>> to the /dev/kmsg of container, is this want we want?
>>
> Ah.. I think your question targets at devkmsg_writev function, right? 

yep, another small problem, you forgot to remove the global logbuf_lock.

> You remind me that it's really an issue. Printk_emit in devkmsg_writev 
> should not use init_syslog_ns as its syslog_ns but current_user_ns->syslog_ns.
> 
> In 1st version, current_syslog_ns was used in vprintk_emit. In this version,
> the interface vprintk_emit has changed, but this patch misses that.
> I will fix it.
> 

Ok, thanks!
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