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From: Christoph Hellwig <hch@lst.de>
To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: qemu-devel@nongnu.org, hch@lst.de
Subject: Re: [Qemu-devel] QEMU online guest disk resize wrt host block devices
Date: Thu, 1 Sep 2011 16:05:26 +0200	[thread overview]
Message-ID: <20110901140526.GA9388@lst.de> (raw)
In-Reply-To: <20110901132755.GG14462@redhat.com>

On Thu, Sep 01, 2011 at 02:27:55PM +0100, Daniel P. Berrange wrote:
> I see two likely approaches:
> 
>  1. Add a parameter to the existing 'block_resize' command
>     'refreshonly=true|false'
> 
>  2. Add a separate command  'block_refresh'

I think all that you need is a to implement a bdrv_truncate method
for host devices that simply checks if the new size smaller or equal
to the device size, and return 0 in that case or an error otherwise.

  reply	other threads:[~2011-09-01 14:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-01 13:27 [Qemu-devel] QEMU online guest disk resize wrt host block devices Daniel P. Berrange
2011-09-01 14:05 ` Christoph Hellwig [this message]
2011-09-01 14:30   ` Daniel P. Berrange
2011-09-01 15:55     ` Christoph Hellwig
2011-09-02 15:00       ` Daniel P. Berrange
2011-09-07 11:02       ` [Qemu-devel] [PATCH] block: allow resizing of images residing on host devices Christoph Hellwig
2011-09-09  9:37         ` Kevin Wolf
2011-09-01 14:27 ` [Qemu-devel] QEMU online guest disk resize wrt host block devices Daniel P. Berrange
2011-09-01 15:56   ` Christoph Hellwig
2011-09-05 13:03     ` Kevin Wolf

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