fix zfs set canmount=off on an unmounted filesystem
Previously this operation tried to unmount and remount children.
Also see https://www.illumos.org/issues/6428.
MFC after: 2 weeks
X-Needs-Upstreaming: illumos
Description
Description
Details
Details
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avg Authored on - Parents
- rS297520: zfs receive: -u can be ignored sometimes
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