On Mon, Aug 13, 2018 at 8:44 PM Eric Blake <eblake@redhat.com> wrote:

> #ifdef FALLOC_FL_ZERO_RANGE
> - r = do_fallocate (h->fd, FALLOC_FL_ZERO_RANGE, offset, count);
> - if (r == -1 && errno != EOPNOTSUPP) {
> - nbdkit_error ("zero: %m");
> + if (h->can_zero_range) {
> + r = do_fallocate (h->fd, FALLOC_FL_ZERO_RANGE, offset, count);
> + if (r== 0)

Spacing is off.

I'll fix it in the next version.

Nir