Re: [PATCH v4 1/1] qemu-img: Add --target-is-zero to convert

[Eric Blake]

On 2/5/20 5:02 AM, David Edmondson wrote:
> In many cases the target of a convert operation is a newly provisioned
> target that the user knows is blank (reads as zero). In this situation
> there is no requirement for qemu-img to wastefully zero out the entire
> device.
>
> Add a new option, --target-is-zero, allowing the user to indicate that
> an existing target device will return zeros for all reads.
>
> Signed-off-by: David Edmondson <address@hidden>
> ---
>   docs/interop/qemu-img.rst |  9 ++++++++-
>   qemu-img-cmds.hx          |  4 ++--
>   qemu-img.c                | 26 +++++++++++++++++++++++---
>   3 files changed, 33 insertions(+), 6 deletions(-)

Reviewed-by: Eric Blake <address@hidden>

--
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org