linux-kernel - Re: [PATCH V3 3/8] Cleancache: core ops functions and configuration

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Date:	Wed, 07 Jul 2010 06:32:56 +0530
From:	Nitin Gupta <ngupta@...are.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Dave Hansen <dave@...1.net>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	chris.mason@...cle.com, viro@...iv.linux.org.uk,
	akpm@...ux-foundation.org, adilger@....COM, tytso@....edu,
	mfasheh@...e.com, joel.becker@...cle.com, matthew@....cx,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	ocfs2-devel@....oracle.com, linux-mm@...ck.org, jeremy@...p.org,
	JBeulich@...ell.com, kurt.hackel@...cle.com, npiggin@...e.de,
	dave.mccracken@...cle.com, riel@...hat.com, avi@...hat.com
Subject: Re: [PATCH V3 3/8] Cleancache: core ops functions and configuration

On 07/07/2010 02:21 AM, Konrad Rzeszutek Wilk wrote:
> On Tue, Jun 22, 2010 at 09:26:28AM -0700, Dave Hansen wrote:
>> On Mon, 2010-06-21 at 16:19 -0700, Dan Magenheimer wrote:
>>> --- linux-2.6.35-rc2/include/linux/cleancache.h 1969-12-31 17:00:00.000000000 -0700
>>> +++ linux-2.6.35-rc2-cleancache/include/linux/cleancache.h      2010-06-21 14:45:18.000000000 -0600
>>> @@ -0,0 +1,88 @@
>>> +#ifndef _LINUX_CLEANCACHE_H
>>> +#define _LINUX_CLEANCACHE_H
>>> +
>>> +#include <linux/fs.h>
>>> +#include <linux/mm.h>
>>> +
>>> +struct cleancache_ops {
>>> +       int (*init_fs)(size_t);
>>> +       int (*init_shared_fs)(char *uuid, size_t);
>>> +       int (*get_page)(int, ino_t, pgoff_t, struct page *);
>>> +       void (*put_page)(int, ino_t, pgoff_t, struct page *);
>>> +       void (*flush_page)(int, ino_t, pgoff_t);
>>> +       void (*flush_inode)(int, ino_t);
>>> +       void (*flush_fs)(int);
>>> +};
>>> + 
>>
>> How would someone go about testing this code?  Is there an example
>> cleancache implementation?
> 
> Dan,
> 
> Can you reference with a link or a git branch the patches that utilize
> this?
> 
> And also mention that in the 0/X patch so that folks can reference your
> cleancache implementation?
> 
>

FYI.

I am working on 'zcache' which uses cleancache_ops to provide page cache
compression support. I will be posting it to LKML before end of next week.

Thanks,
Nitin
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