From: Ming Zhang <blackmagic02881@gmail.com>
Subject: Re: about quota implementation
Date: Mon, 12 Mar 2007 13:24:17 -0400
Message-ID: <1173720257.3889.35.camel@dhcp-107.ibrix.com>
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	<20070312163517.GA8690@infradead.org>
	<1173719485.6436.35.camel@heimdal.trondhjem.org>
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Cc: Christoph Hellwig <hch@infradead.org>, nfs@lists.sourceforge.net
To: Trond Myklebust <trond.myklebust@fys.uio.no>
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On Mon, 2007-03-12 at 13:11 -0400, Trond Myklebust wrote:
> On Mon, 2007-03-12 at 16:35 +0000, Christoph Hellwig wrote:
> > On Mon, Mar 12, 2007 at 12:11:49PM -0400, Ming Zhang wrote:
> > > Hi All
> > > 
> > > I have a question about current quota implementation. 
> > > 
> > > This is current implementation. There is a rquotad running on same box
> > > as nfsd. Then in quota-tools, it check if file system type is nfs, then
> > > it invoke a rpc call and get that from rquotad.
> > > 
> > > Another way is to implement the s_qcops in kernel nfs client and thus
> > > quota-tools can use a unified way to get quotactl information.
> > > 
> > > Any special reason why not use 2nd way to make quota-tools simpler? One
> > > reason I can think of is to put unnecessary code out of kernel. Is there
> > > any other reason?
> > 
> > I think it's mostly a historical issue.  There was no abstraction
> > between the quotactl syscall and the default disk based quota implementation
> > at the time the nfs quote code was written.  I'd definitively welcome
> > a patch adding a kernel interface for nfs quotas.
> 
> I wouldn't. 'NFS quotas' use a completely different RPC program. We do
> not need to interface them to the VFS (the server will enforce quotas
> without any client aid), and so the rquotad stuff really only exists in
> order to allow users to display their quotas. It belongs in userland.
> 

so it worthy duplicating whole rpc logic in quota-tools instead of a
unified interface via vfs and single quotactl system call?


> Cheers
>   Trond
> 


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