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

From: Eric Blake
Subject: Re: [PATCH v4 1/1] qemu-img: Add --target-is-zero to convert
Date: Wed, 5 Feb 2020 19:45:36 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

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

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

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