From owner-freebsd-geom@FreeBSD.ORG  Thu Jun 17 11:53:38 2004
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To: Lukas Ertl <l.ertl@univie.ac.at>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Thu, 17 Jun 2004 13:33:31 +0200."
             <20040617132625.A58154@pcle2.cc.univie.ac.at> 
Date: Thu, 17 Jun 2004 13:52:08 +0200
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cc: geom@freebsd.org
Subject: Re: GEOM: orphaning open devices 
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In message <20040617132625.A58154@pcle2.cc.univie.ac.at>, Lukas Ertl writes:
>Hi GEOM hackers,
>
>I have the following scenario: a mirrored setup with two disks and a 
>filesystem on top of it.  Now, if I yank one disk while the fs is not 
>mounted, everything works as expected: disk_destroy is called and the 
>orphaning events make their way up.
>
>However, if the fs is mounted and I yank the disk, I don't see an 
>orphaning event until the fs is unmounted again, so it seems disk_destroy 
>is blocked or rather g_wither_geom waits until the device is closed, which 
>makes it rather useless in a production area.

That is a lot of ground and very little information.

the way this is supposed to happen is that you yank the disk,
which should orphan geom_disk::whatever and your mirror class
should get an orphan event to act on, and de-access and detach
your consumer, and that should let the geom_disk::geom wither
away.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.