V1 was here: https://lists.gnu.org/archive/html/qemu-devel/2025-04/msg01654.html
In v2:
- Rearrange and split several patches
- Fewer changes to file-posix.c; instead,
- New bdrv_co_is_all_zeroes() in io.c, which works on both file-posix and NBD
- Clean up several corner cases spotted during review
- Better iotest coverage, required pulling in Andrey's patch for disk_usage
Andrey Drobyshev (1):
iotests/common.rc: add disk_usage function
Eric Blake (10):
block: Expand block status mode from bool to enum
file-posix: Handle zero block status hint better
block: Let bdrv_co_is_zero_fast consolidate adjacent extents
block: Add new bdrv_co_is_all_zeroes() function
iotests: Improve iotest 194 to mirror data
mirror: Minor refactoring
mirror: Skip pre-zeroing destination if it is already zero
mirror: Skip writing zeroes when target is already zero
tests: Add iotest mirror-sparse for recent patches
mirror: Allow QMP override to declare target already zero
qapi/block-core.json | 8 +-
block/coroutines.h | 4 +-
include/block/block-common.h | 26 ++++
include/block/block-io.h | 2 +
include/block/block_int-common.h | 25 ++--
include/block/block_int-global-state.h | 3 +-
include/block/block_int-io.h | 4 +-
block/io.c | 120 ++++++++++++----
block/blkdebug.c | 6 +-
block/copy-before-write.c | 4 +-
block/file-posix.c | 5 +-
block/gluster.c | 4 +-
block/iscsi.c | 6 +-
block/mirror.c | 121 +++++++++++++---
block/nbd.c | 4 +-
block/null.c | 6 +-
block/parallels.c | 6 +-
block/qcow.c | 2 +-
block/qcow2.c | 6 +-
block/qed.c | 6 +-
block/quorum.c | 4 +-
block/raw-format.c | 4 +-
block/rbd.c | 6 +-
block/snapshot-access.c | 4 +-
block/vdi.c | 4 +-
block/vmdk.c | 2 +-
block/vpc.c | 2 +-
block/vvfat.c | 6 +-
blockdev.c | 18 ++-
tests/unit/test-block-iothread.c | 4 +-
tests/qemu-iotests/common.rc | 6 +
tests/qemu-iotests/194 | 1 +
tests/qemu-iotests/250 | 5 -
tests/qemu-iotests/tests/mirror-sparse | 109 +++++++++++++++
tests/qemu-iotests/tests/mirror-sparse.out | 153 +++++++++++++++++++++
35 files changed, 571 insertions(+), 125 deletions(-)
create mode 100755 tests/qemu-iotests/tests/mirror-sparse
create mode 100644 tests/qemu-iotests/tests/mirror-sparse.out
--
2.49.0