vdev_disk_io_start changes, cstyle fixes
Merge remote-tracking branch 'origin/master' into vdev-disk2
cstyle -pPc fixes
Remove redundant check of vdev_readable
Minor cleanups
Merge branch 'master' into vdev-disk-fixes
Merge branch 'master' into vdev-disk-fixes
Merge pull request #191 from openzfsonosx/vdev-disk-fixes

Vdev disk fixes