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

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Date:	Wed, 30 May 2012 21:54:53 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Jeff Liu <jeff.liu@...cle.com>
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 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?

	    	       	     	   	       - Ted
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