On Thu, May 26, 2022 at 12:29:41AM -0700, Eric Biggers wrote: > On Wed, May 25, 2022 at 06:06:12PM -0700, Keith Busch wrote: > > + /* > > + * Each segment in the iov is required to be a block size multiple. > > Where is this enforced? Right below the comment. If it isn't a block size multiple, then ALIGN_DOWN will eventually result in 0 and -EFAULT is returned.