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

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Message-ID: <51FA004F.6020709@huawei.com>
Date:	Thu, 1 Aug 2013 14:29:35 +0800
From:	Rui Xiang <rui.xiang@...wei.com>
To:	Gao feng <gaofeng@...fujitsu.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 2013/8/1 13:38, Gao feng wrote:
> 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.
> 

Got it.



Thanks.


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