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### Description
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### Motivation and Context
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### How Has This Been Tested?
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### Types of changes
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- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Performance enhancement (non-breaking change which improves efficiency)
- [ ] Code cleanup (non-breaking change which makes code smaller or more readable)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)
- [ ] Documentation (a change to man pages or other documentation)

### Checklist:
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- [ ] My code follows the ZFS on Linux code style requirements.
- [ ] I have updated the documentation accordingly.
- [ ] I have read the **CONTRIBUTING** document.
- [ ] I have added tests to cover my changes.
- [ ] All new and existing tests passed.
- [ ] All commit messages are properly formatted and contain `Signed-off-by`.
- [ ] Change has been approved by a ZFS on Linux member.
