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

David Woodhouse
2007-05-16T12:09:38Z

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