On Wed, May 16, 2007 at 08:09:19PM +0800, David Woodhouse wrote: > 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()? This is why there are so many variations on copy_from_user that zero on faults. One way or another, the prepare_write/commit_write pair are responsible for filling it in. -chris - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
