This series is adding [-c | --compress] option to "qemu-img rebase"
command, which might prove useful for saving some disk space when, for
instance, manipulating chains of backup images. Along the way I had to
make a couple of minor improvements.
The first 2 patches are a bug fix + corresponding test case.
Patch 3 merely fixes wrong args used in allocation.
Patch 4 makes write requests during rebase operation cluster_size-aligned,
which seems to be beneficial for both non-compressed and compressed mode.
The last 2 patches are the actual feature implementation + tests.
Andrey Drobyshev (6):
qemu-img: rebase: stop when reaching EOF of old backing file
qemu-iotests: 024: add rebasing test case for overlay_size >
backing_size
qemu-img: rebase: use backing files' BlockBackend for buffer alignment
qemu-img: rebase: avoid unnecessary COW operations
qemu-img: add compression option to rebase subcommand
iotests: add test 314 for "qemu-img rebase" with compression
docs/tools/qemu-img.rst | 6 +-
qemu-img-cmds.hx | 4 +-
qemu-img.c | 106 ++++++++++++++++++------
tests/qemu-iotests/024 | 57 +++++++++++++
tests/qemu-iotests/024.out | 30 +++++++
tests/qemu-iotests/314 | 165 +++++++++++++++++++++++++++++++++++++
tests/qemu-iotests/314.out | 75 +++++++++++++++++
7 files changed, 415 insertions(+), 28 deletions(-)
create mode 100755 tests/qemu-iotests/314
create mode 100644 tests/qemu-iotests/314.out