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From: Kevin Wolf <kwolf@redhat.com>
To: Fam Zheng <famz@redhat.com>
Cc: qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>,
	qemu-block@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 1/2] block: Open backing image in force share mode for size probe
Date: Fri, 22 Dec 2017 13:49:30 +0100	[thread overview]
Message-ID: <20171222124930.GD3763@localhost.localdomain> (raw)
In-Reply-To: <20171215080446.10671-2-famz@redhat.com>

Am 15.12.2017 um 09:04 hat Fam Zheng geschrieben:
> Management tools create overlays of running guests with qemu-img:
> 
>   $ qemu-img create -b /image/in/use.qcow2 -f qcow2 /overlay/image.qcow2
> 
> but this doesn't work anymore due to image locking:
> 
>     qemu-img: /overlay/image.qcow2: Failed to get shared "write" lock
>     Is another process using the image?
>     Could not open backing image to determine size.
> Use the force share option to allow this use case again.
> 
> Cc: qemu-stable@nongnu.org
> Signed-off-by: Fam Zheng <famz@redhat.com>

Thanks, applied this patch to the block branch. Please resend a fixed
version of the test case.

Kevin

  reply	other threads:[~2017-12-22 12:49 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-15  8:04 [Qemu-devel] [PATCH 0/2] block: Fix qemu-img creating overlay when guest running Fam Zheng
2017-12-15  8:04 ` [Qemu-devel] [PATCH 1/2] block: Open backing image in force share mode for size probe Fam Zheng
2017-12-22 12:49   ` Kevin Wolf [this message]
2017-12-15  8:04 ` [Qemu-devel] [PATCH 2/2] iotests: Test creating overlay when guest running Fam Zheng
2017-12-15 19:49   ` Eric Blake
2017-12-22 12:47   ` Kevin Wolf
2017-12-15 19:51 ` [Qemu-devel] [PATCH 0/2] block: Fix qemu-img " Eric Blake

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