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Re: [Qemu-block] [PATCH 1/2] block: Open backing image in force share mo


From: Kevin Wolf
Subject: Re: [Qemu-block] [PATCH 1/2] block: Open backing image in force share mode for size probe
Date: Fri, 22 Dec 2017 13:49:30 +0100
User-agent: Mutt/1.9.1 (2017-09-22)

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: address@hidden
> Signed-off-by: Fam Zheng <address@hidden>

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

Kevin



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