linux-kernel - Re: [PATCH 1 of 2] block_page

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Message-Id: <1179317360.2859.225.camel@shinybook.infradead.org>
Date:	Wed, 16 May 2007 20:09:19 +0800
From:	David Woodhouse <dwmw2@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	David Chinner <dgc@....com>, lkml <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 1 of 2] block_page_mkwrite() Implementation V2

On Wed, 2007-05-16 at 11:19 +0100, David Howells wrote:
> The start and end points passed to block_prepare_write() delimit the region of
> the page that is going to be modified.  This means that prepare_write()
> doesn't need to fill it in if the page is not up to date. 

Really? Is it _really_ going to be modified? Even if the pointer
userspace gave to write() is bogus, and is going to fault half-way
through the copy_from_user()?

-- 
dwmw2

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