[Bug 188328] [zfs] UPDATING should provide caveats for running `zpool upgrade`

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188328

Jan Kokemüller <jan.kokemueller at gmail.com> changed:

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                 CC|                            |jan.kokemueller at gmail.com

--- Comment #3 from Jan Kokemüller <jan.kokemueller at gmail.com> ---
Created attachment 147531
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=147531&action=edit
Untested patch that adds the missing bootcode upgrade warning

I've just had the same problem after upgrading my bootpool on 10-stable. I used
"zpool upgrade -a". I was already on pool version 5000; only some feature flags
were added. The problematic feature flags not recognized by the bootloader were
"com.delphix:hole_birth" and "com.delphix:embedded_data".

I was aware of the "gpart bootcode" dance but "zpool upgrade -a" definitely
showed no message so I assumed it was safe to reboot without upgrading the
bootloader. I've looked at the zpool code and it seems that in the case of
"zpool upgrade -a" the bootcode upgrade warning may not be displayed. I've
attached a patch that should fix it (untested, but it compiles).

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