linux-kernel - Re: [PATCH 1/7] Introduce the pagetable_operations and associated helper macros.

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Message-ID: <4600E062.8020001@yahoo.com.au>
Date:	Wed, 21 Mar 2007 18:36:02 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	William Lee Irwin III <wli@...omorphy.com>,
	Adam Litke <agl@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ken Chen <kenchen@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 1/7] Introduce the pagetable_operations and associated
 helper macros.

Nick Piggin wrote:

> Yeah you could, but it looks back to front to me.
> 
> The VM tells the filesystem that the machine took a fault at virtual
> address X, then the filesystem asks the VM what pgoff that is, then
> tells the VM to install the corresponding page to vaddr X.
> 
> With my ->fault, the VM asks the filesystem to give the page that
> corresponds to vaddr X, then installs it into that vaddr.

Err, sorry, that's what the current ->nopage does. It is then still
up to the filesystem to do the vaddr to pgoff conversion.

My fault patches of course just ask the filesystem for the page at
a given pgoff.

-- 
SUSE Labs, Novell Inc.
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