Make sgivol(8) use the device sector size for reads and writes. This allows us to use sgivol on devices which have a sector size != DEV_BSIZE, such as a CD drive.
Make sgivol(8) use the device sector size for reads and writes. This allows
us to use sgivol on devices which have a sector size != DEV_BSIZE, such as
a CD drive.

ok miod@ krw@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars