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On 30.05.25 10:44, Hanna Czenczek wrote:
Hi,
This series adds a keep_data_file qemu-img create option to qcow2 that
makes it keep the given external data file for a newly created image
instead of overwriting it.
This allows to create a qcow2 image for an existing raw image using the
qemu-img create command, which previously wasn’t easily possible
(besides work-arounds using a temporary data file or qemu-img amend).
(The “proper” way of doing it without this option is to use QMP
blockdev-create.)
This new option is a pure qemu-img create (i.e. command-line) option,
not available via QMP, because it does not make any sense there. See
patch 1 for more explanation.
(See https://issues.redhat.com/browse/RHEL-73509 for perhaps a bit more
context.)
Hanna Czenczek (4):
qcow2: Add keep_data_file command-line option
qcow2: Simplify size round-up in co_create_opts
iotests/common.filter: Sort keep_data_file
iotests/244: Add test cases for keep_data_file
include/block/block_int-common.h | 1 +
block/qcow2.c | 78 +++++++++++++++++++++++++++++---
tests/qemu-iotests/082.out | 18 ++++++++
tests/qemu-iotests/244 | 71 +++++++++++++++++++++++++++++
tests/qemu-iotests/244.out | 53 ++++++++++++++++++++++
tests/qemu-iotests/common.filter | 2 +-
6 files changed, 216 insertions(+), 7 deletions(-)
