935550f1bb
Porting notes: - Many changes were already made in ZoL (for ex. in d4ed66734). Authored by: Paul Dagnelie <pcd@delphix.com> Reviewed by: Dan Kimmel <dan.kimmel@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Prakash Surya <prakash.surya@delphix.com> Reviewed by: Yuri Pankov <yuri.pankov@nexenta.com> Approved by: Robert Mustacchi <rm@joyent.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Ported-by: George Melikov <mail@gmelikov.ru> OpenZFS-issue: https://www.illumos.org/issues/6872 OpenZFS-commit: https://github.com/openzfs/openzfs/commit/f83b46b Closes #5640