[Bug 211028] [GEOM][Hyper-V] gpart can't detect the new free space after the disk capacity changes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211028

--- Comment #10 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Edward Tomasz Napierala from comment #9)
> Hm.  Okay.  The read dd works, because the da(4) driver gets notified about
> the capacity change on the first read command sent to the disk; basically
> the disk responds with Unit Attention indicating this.  The write dd works,
> because it forces GEOM retaste.  So it still fits the theory that GEOM
> itself is fine, and it's just g_part(4) not handling it properly.

As I said, tracing via dtrace or geom's internal capability should show that
g_part receives resize event. In previous messages I didn't see this.

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