On Mon, Jun 23, 2014 at 08:44:40 +0100, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
blkdev_read_iter() wants to cap the iov_iter by the amount of data remaining to the end of device. That's what iov_iter_truncate() is for (trim iter->count if it's above the given limit). So far, so good, but the argument of iov_iter_truncate() is size_t, so on 32bit boxen (in case of a large device) we end up with that upper limit truncated down to 32 bits *before* comparing it with iter->count.
This seems to fix a problem I had (https://bugzilla.kernel.org/show_bug.cgi?id=78711) with a partition device (/dev/sda3) being zero size on 3.16 kernels. However I am having some other issues with 3.16 on i686 and the amount of testing was the raid array using /dev/sda3 appeared to start (which it hadn't previously), but the system hung before finishing the boot process.
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