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Re: [Qemu-block] [PATCH v5 1/2] blockdev: move BDRV_O_NO_BACKING option
From: |
Eric Blake |
Subject: |
Re: [Qemu-block] [PATCH v5 1/2] blockdev: move BDRV_O_NO_BACKING option forward |
Date: |
Tue, 18 Jul 2017 07:27:14 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 |
On 07/17/2017 07:34 PM, John Snow wrote:
> For both external_snapshot_prepare and qmp_drive_mirror, we eventually
> append the option BDRV_O_NO_BACKING. However, we generally do so after
> we create the image.
>
> To accommodate image creation wanting to verify that a backing file
> exists or not, add this option prior to create to override checking
> the existence of the backing file. This prevents QEMU from trying to
> re-open a backing file that's already in use (thanks to qcow2 locking).
>
> Signed-off-by: John Snow <address@hidden>
> ---
> blockdev.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
Reviewed-by: Eric Blake <address@hidden>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
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