linux-kernel - Re: [Xen-devel] [PATCH 0/3] xen-blkback: refactor vbd remove/disconnect.

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Date:	Wed, 03 Aug 2011 15:53:44 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<daniel.stodden@...rix.com>, <Ian.Campbell@...citrix.com>,
	<jaxboe@...ionio.com>, <annie.li@...cle.com>, <joe.jin@...cle.com>,
	<konrad.wilk@...cle.com>, <KURT.HACKEL@...cle.com>
Cc:	<xen-devel@...ts.xensource.com>, <greg.marsden@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 0/3] xen-blkback: refactor vbd
	 remove/disconnect.

>>> Joe Jin 08/03/11 4:10 AM >>> 
>1. start guest with the latest kernel. 
>2. attach new block device by xm block-attach in Dom0 
>3. mount new disk in guest 
>4. execute xm block-detach to detach the block device in dom0 until timeout 
>5. try to unmount the disk in guest, umount hung. at here, any IOs to the 
>device will hang. 

A bogus sequence of operations - an operator in Dom0 shouldn't remove
a device that is still in use in a guest, except as an exceptionasl measure
(and then other bad behavior is to be expected). What's the use case?

Jan
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