[Bug 264174] Use of redaction bookmarks or redacted datasets on a boot pool renders the pool unbootable

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264174

--- Comment #2 from Eugene M. Kim <astralblue@gmail.com> ---
(In reply to Mark Johnston from comment #1)

Feature flags are tri-state:

* disabled - the feature cannot be used in the pool.
* enabled (but inactive) - the feature can be used, but is not currently in
use.
* active (implies enabled) - the feature can be used, and is in use.

The quoted piece of code prevents pools with redacted_datasets feature disabled
from receiving redacted streams, whereas the bug is about receiving redacted
streams in a pool with the feature already enabled (but inactive), resulting in
the feature state transitioning from enabled to active.

The boot loader rejects the pool if a non-whitelisted read-only-incompatible
feature is active; enabled is fine.

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