linux-ext4 - Re: [PATCH 10/12] container quota: bill container inodes alloc/free on ext4.

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Message-ID: <4FC6E469.2040405@oracle.com>
Date:	Thu, 31 May 2012 11:24:25 +0800
From:	Jeff Liu <jeff.liu@...cle.com>
To:	"Ted Ts'o" <tytso@....edu>
CC:	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	jack@...e.cz, glommer@...allels.com, daniel.lezcano@...e.fr,
	bpm@....com, chris.mason@...cle.com, hch@...radead.org,
	christopher.jones@...cle.com, david@...morbit.com,
	tinguely@....com, tm@....ma, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 10/12] container quota: bill container inodes alloc/free
 on ext4.

On 05/31/2012 10:37 AM, Jeff Liu wrote:

> On 05/31/2012 09:54 AM, Ted Ts'o wrote:
> 
>> On Thu, May 31, 2012 at 09:43:18AM +0800, Jeff Liu wrote:
>>> I also think that is stupid to change all of the file systems with those
>>> hook routines.
>>> At first I have tried to change the quota layer by adding
>>> ns_dquot_<foo>() to the corresponding dquot_<foo>(), it could works on
>>> ext4, and it should works on other file systems which are tightly bound
>>> to VFS quota IMHO.
>>>
>>> However, XFS has its own quota management subsystem, with looser binding
>>> to VFS quota.  That's why am trying to export those routines over all
>>> the file systems and CC to the maintainers, sorry for the noise.
>>
>> No worries about the noise.  I was just trying to suggest something
>> that might be easier for you.
>>
>> As near as I can tell XFS doesn't use the fs/quota functions at all,
>> yes?  But if you add it into the fs/quota functions, it should get you
>> integration with ext2, ext3, ext4, jfs, ocfs2, and reiserfs.  Yes?
> 
> Yes, I just took a quick look through over ocfs2, reiserfs and jfs, they
> are all ok.

Such being the case, maybe I should tight ns_dquot_<foo>() to VFS quota
to reduce duplication firstly, at lease, it could works with most file
systems.  Then consider another way to let it works with other file
systems doesn't use fs/quota.

Thanks,
-Jeff

> 
> Thanks,
> -Jeff
> 
>>
>> 	    	       	     	   	       - Ted
>> --
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> 
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