Qemu 8.1.0 will have a new qcow2 option named discard-no-unref.
https://gitlab.com/qemu-project/qemu/-/commit/42a2890a76f4783cd1c212f27856edcf2b5e8a75

Enabling this option wil change the way qemu handles guest discards
inside the qcow2 image and will highly improve the fragmentation within
the qcow2 image.

We want to be able to enable this option (which is off by default) via
libvirt, so this patch adds this option in libvirt.

Jean-Louis Dupond (2):
  Add discard_no_unref option for qcow2 images
  Update NEWS with new discard_no_unref option

 NEWS.rst                                      |  2 +
 docs/formatdomain.rst                         |  6 +++
 src/conf/domain_conf.c                        |  8 +++
 src/conf/domain_conf.h                        |  1 +
 src/conf/domain_validate.c                    | 15 ++++++
 src/conf/schemas/domaincommon.rng             |  8 +++
 src/conf/storage_source_conf.c                |  1 +
 src/conf/storage_source_conf.h                |  1 +
 src/qemu/qemu_block.c                         | 11 ++---
 src/qemu/qemu_domain.c                        |  1 +
 src/qemu/qemu_driver.c                        |  4 +-
 src/vz/vz_utils.c                             |  6 +++
 tests/qemusecuritytest.c                      |  1 +
 .../disk-discard_no_unref.x86_64-latest.args  | 39 +++++++++++++++
 .../disk-discard_no_unref.xml                 | 39 +++++++++++++++
 tests/qemuxml2argvtest.c                      |  1 +
 .../disk-discard_no_unref.x86_64-latest.xml   | 49 +++++++++++++++++++
 tests/qemuxml2xmltest.c                       |  1 +
 18 files changed, 187 insertions(+), 7 deletions(-)
 create mode 100644 tests/qemuxml2argvdata/disk-discard_no_unref.x86_64-latest.args
 create mode 100644 tests/qemuxml2argvdata/disk-discard_no_unref.xml
 create mode 100644 tests/qemuxml2xmloutdata/disk-discard_no_unref.x86_64-latest.xml

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2.41.0