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Re: [Qemu-block] [PATCH] vmdk: Set vmdk parent backing_format to vmdk


From: Sam Eiderman
Subject: Re: [Qemu-block] [PATCH] vmdk: Set vmdk parent backing_format to vmdk
Date: Thu, 11 Apr 2019 13:43:52 +0300

Are you going to fix this when you apply the patch or should I?

> On 10 Apr 2019, at 23:07, Max Reitz <address@hidden> wrote:
> 
> On 10.04.19 21:15, Max Reitz wrote:
>> On 26.03.19 20:58, Sam Eiderman wrote:
>>> Commit fb2105b ("vmdk: Support version=3 in VMDK descriptor files") fixed
>>> the probe function to correctly guess vmdk descriptors with version=3.
>>> 
>>> This solves the issue where vmdk snapshot with parent vmdk descriptor
>>> containing "version=3" would be treated as raw instead vmdk.
>>> 
>>> In the future case where a new vmdk version is introduced, we will again
>>> experience this issue, even if the user will provide "-f vmdk" it will
>>> only apply to the tip image and not to the underlying "misprobed" parent
>>> image.
>>> 
>>> The code in vmdk.c already assumes that the backing file of vmdk must be
>>> vmdk (see vmdk_is_cid_valid which returns 0 if backing file is not
>>> vmdk).
>>> 
>>> So let's make it official by supplying the backing_format as vmdk.
>>> 
>>> Reviewed-by: Mark Kanda <address@hidden>
>>> Reviewed-By: Liran Alon <address@hidden>
>>> Reviewed-by: Arbel Moshe <address@hidden>
>>> Signed-off-by: Shmuel Eiderman <address@hidden>
>>> ---
>>> block/vmdk.c | 2 ++
>>> 1 file changed, 2 insertions(+)
>> 
>> Because this is not in master yet, maybe it’s still time for me to say
>> that this breaks iotests 110 and 126 (requires a trivial fix to the
>> reference output).
> 
> Correction: It’s a bit more complicated because both tests should work
> for other formats, too.  So I guess the backing file format should be
> filtered from the output.
> 
> Max
> 




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