clear zfs properties

Default zfs properties can be read with zfs get.

root@sol11aa ~# zfs get -r quota rpool/mita
NAME              PROPERTY  VALUE  SOURCE
rpool/mita        quota     none   default
rpool/mita/jenna  quota     none   default
rpool/mita/josep  quota     none   default

These properties can be changed with zfs set.

root@sol11aa ~# zfs set quota=2gb rpool/mita/jenna
root@sol11aa ~# zfs get -r quota rpool/mita
NAME              PROPERTY  VALUE  SOURCE
rpool/mita        quota     none   default
rpool/mita/jenna  quota     2G     local
rpool/mita/josep  quota     none   default

And they can be cleared by setting the property to none, but the source is now set to local instead of default.

root@sol11aa ~# zfs set quota=none rpool/mita/jenna
root@sol11aa ~# zfs get -r quota rpool/mita
NAME              PROPERTY  VALUE  SOURCE
rpool/mita        quota     none   default
rpool/mita/jenna  quota     none   local
rpool/mita/josep  quota     none   default

This local can be restored to default using zfs inherit.

root@sol11aa ~# zfs inherit -Sr quota rpool/mita/jenna
root@sol11aa ~# zfs get -r quota rpool/mita
NAME              PROPERTY  VALUE  SOURCE
rpool/mita        quota     none   default
rpool/mita/jenna  quota     none   default
rpool/mita/josep  quota     none   default