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eaa25f1a8e
The GRUB restrictions are based around the pool's bootfs property. Given the current situation where GRUB is not staying current with OpenZFS pool features, having either a non-ZFS /boot or a separate pool with limited features are pretty much the only long-term answers for GRUB support. Only the second case matters in this context. For the restrictions to be useful, the bootfs property would have to be set on the boot pool, because that is where we need the restrictions, as that is the pool that GRUB reads from. The documentation for bootfs describes it as pointing to the root pool. That's also how it's used in the initramfs. ZFS does not allow setting bootfs to point to a dataset in another pool. (If it did, it'd be difficult-to-impossible to enforce these restrictions cross-pool). Accordingly, bootfs is pretty much useless for GRUB scenarios moving forward. Even for users who have only one pool, the existing restrictions for GRUB are incomplete. They don't prevent you from enabling the unsupported checksums, for example. For that reason, I have ripped out all the GRUB restrictions. A little longer-term, I think extending the proposed features=portable system to define a features=grub is a much more useful approach. The user could set that on the boot pool at creation, and things would Just Work. Reviewed-by: Paul Dagnelie <pcd@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Laager <rlaager@wiktel.com> Closes #8627 |
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