[libvirt] [PATCH] qemu: domain: Don't treat unknown storage type as not having backing chain

John Ferlan jferlan at redhat.com
Fri May 6 15:23:13 UTC 2016

On 05/06/2016 09:48 AM, Peter Krempa wrote:
> qemuDomainCheckDiskPresence has short-circuit code to skip the
> determination of the disk backing chain for storage formats that can't
> have backing volumes. The code treats VIR_STORAGE_FILE_NONE as not
> having backing chain and skips the call to qemuDomainDetermineDiskChain.
> This is wrong as qemuDomainDetermineDiskChain is responsible for storage
> format detection and has logic to determine the default type if format
> detection is disabled.
> This allows to storage passed via <disk type="volume"> to circumvent the
> enforcement to have correct storage format or that we shall default to
> format='raw', since we don't set the default type via the post parse
> callback for "volume" backed disks as the translation code could come up
> with a better guess.
> This resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1328003
> ---
>  src/qemu/qemu_domain.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)



Do you believe it still would be worthwhile to add:

    if (virDomainDiskGetFormat(def) == VIR_STORAGE_FILE_NONE)
        virDomainDiskSetFormat(def, VIR_STORAGE_FILE_RAW);

in virStorageTranslateDiskSourcePool in the ISCSI case for MODE_HOST?

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