Re: [PATCH v2] qemu: don't check for backing chains for formats w/o snapshot support

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On Thu, Apr 24, 2014 at 12:32:01 +0200, Martin Kletzander wrote:
> Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1019926
> Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=868673
> 
> Signed-off-by: Martin Kletzander <mkletzan@xxxxxxxxxx>
> ---
> 
> Notes:
>     Smaller and cleaner variant of v1 [1] after discussion with Eric
>     
>     [1] https://www.redhat.com/archives/libvir-list/2014-April/msg00716.html
> 
>  src/qemu/qemu_domain.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> index 45ed872..5687075 100644
> --- a/src/qemu/qemu_domain.c
> +++ b/src/qemu/qemu_domain.c
> @@ -2268,11 +2268,14 @@ qemuDomainCheckDiskPresence(virQEMUDriverPtr driver,
>      VIR_DEBUG("Checking for disk presence");
>      for (i = vm->def->ndisks; i > 0; i--) {
>          disk = vm->def->disks[i - 1];
> +        enum virStorageFileFormat format = virDomainDiskGetFormat(disk);
> 
>          if (!virDomainDiskGetSource(disk))
>              continue;
> 
> -        if (qemuDomainDetermineDiskChain(driver, vm, disk, false) >= 0 &&
> +        if ((format < VIR_STORAGE_FILE_NONE ||
> +             format >= VIR_STORAGE_FILE_BACKING) &&
> +            qemuDomainDetermineDiskChain(driver, vm, disk, false) >= 0 &&
>              qemuDiskChainCheckBroken(disk) >= 0)
>              continue;

Better than the original but still... wouldn't it be better to move the
check to qemuDomainDetermineDiskChain or even virStorageFileGetMetadata,
where we could even use fileTypeInfo[format].getBackingStore as a base
for the decision?

Jirka

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