Re: [PATCH 1 of 2] block_page_mkwrite() Implementation V2

[David Woodhouse]

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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