Re: [Qemu-devel] [PATCH 3/4] block/vpc: give option to force the current_size field in .bdrv_create

[Kevin Wolf]

Am 24.02.2016 um 01:47 hat Jeff Cody geschrieben:
> When QEMU creates a VHD image, it goes by the original spec,
> calculating the current_size based on the nearest CHS geometry (with an
> exception for disks > 127GB).
> 
> Apparently, Azure will only allow images that are sized to the nearest
> MB, and the current_size as calculated from CHS cannot guarantee that.
> 
> Allow QEMU to create images similar to how Hyper-V creates images, by
> setting current_size to the specified virtual disk size.  This
> introduces an option, force_size, to be passed to the vpc format during
> image creation, e.g.:
> 
>     qemu-img convert -f raw -o force_size -O vpc test.img test.vhd
> 
> Bug reference: https://bugs.launchpad.net/qemu/+bug/1490611
> 
> Signed-off-by: Jeff Cody <address@hidden>

We need to set a different creator string here that makes vpc_open()
recognise the image as current_size based.

Kevin