The zpool checkpoint feature in DxOS added a new field in the uberblock.
The Multi-Modifier Protection Pull Request from ZoL adds two new fields
in the uberblock (Reference: https://github.com/zfsonlinux/zfs/pull/6279).

As these two changes come from two different sources and once upstreamed
and deployed will introduce an incompatibility with each other we want
to upstream a change that will reserve the padding for both of them so
integration goes smoothly and everyone gets both features.
You can view, comment on, or merge this pull request online at:

  https://github.com/openzfs/openzfs/pull/425

-- Commit Summary --

  * 8491 uberblock on-disk padding to reserve space for smoothly merging zpool 
checkpoint & MMP in ZFS

-- File Changes --

    M usr/src/uts/common/fs/zfs/sys/uberblock_impl.h (3)

-- Patch Links --

https://github.com/openzfs/openzfs/pull/425.patch
https://github.com/openzfs/openzfs/pull/425.diff

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