linux-kernel - Re: [patch 3/3] mm: fault handler to replace nopage and populate

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Message-ID: <4531E946.5070503@yahoo.com.au>
Date:	Sun, 15 Oct 2006 17:54:46 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Ingo Oeser <ioe-lkml@...eria.de>
CC:	Nick Piggin <npiggin@...e.de>, Carsten Otte <cotte.de@...il.com>,
	Linux Memory Management <linux-mm@...ck.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch 3/3] mm: fault handler to replace nopage and populate

Hi Ingo,

Ingo Oeser wrote:
> Hi Nick,
> 
> On Thursday, 12. October 2006 14:07, Nick Piggin wrote:
> 
>>Actually, filemap_xip needs some attention I think... if xip files
>>can be truncated or invalidated (I assume they can), then we need to
>>lock the page, validate that it is the correct one and not truncated,
>>and return with it locked.
> 
> 
> ???
> 
> Isn't XIP for "eXecuting In Place" from ROM or FLASH?

Yes, I assume so. It seems that it isn't restricted to executing, but
is basically a terminology to mean that it bypasses the pagecache.

> How to truncate these? I thought the whole idea of
> XIP was a pure RO mapping?

Well, not filemap_xip.

> 
> They should be valid from mount to umount.
> 
> Regards
> 
> Ingo Oeser, a bit puzzled about that...

See mm/filemap_xip.c:xip_file_write, xip_truncate_page.

Thanks,
Nick

-- 
SUSE Labs, Novell Inc.
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