linux-ext4 - Re: [PATCH V3 0/8] Cleancache: overview

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Date:	Fri, 23 Jul 2010 17:17:49 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	ngupta@...are.org
Cc:	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,
	konrad.wilk@...cle.com
Subject: Re: [PATCH V3 0/8] Cleancache: overview

On Fri, Jul 23, 2010 at 4:36 PM, Nitin Gupta <ngupta@...are.org> wrote:
>
> 2. I think change in btrfs can be avoided by moving cleancache_get_page()
> from do_mpage_reapage() to filemap_fault() and this should work for all
> filesystems. See:
>
> handle_pte_fault() -> do_(non)linear_fault() -> __do_fault()
>                                                -> vma->vm_ops->fault()
>
> which is defined as filemap_fault() for all filesystems. If some future
> filesystem uses its own custom function (why?) then it will have to arrange for
> call to cleancache_get_page(), if it wants this feature.


filemap fault works only in case of file-backed page which is mapped
but don't work not-mapped cache page.  So we could miss cache page by
read system call if we move it into filemap_fault.


-- 
Kind regards,
Minchan Kim
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