[Qemu-devel] [PATCH v2 0/3] mirror: Allow detection of zeroes on source sectors

[Fam Zheng <famz@redhat.com>]

[These patches go on top of the "block: Mirror discarded sectors" series]

v2: Rely on block/io.c zero detection. [Paolo]

Some protocols don't have an easy way to query sparseness, (e.g. block/nfs.c,
block/nbd.c), for which block layer always reports block status as "allocated
data".

This will let mirror job do full provisioning even if data is actually sparse
under the hood.

With the new "detect-zeroes" option, we can let mirror job detect zeroes before
sending the data to target, and use zero write when it is more efficient.

Fam

Fam Zheng (3):
  block: Extrace bdrv_parse_detect_zeroes_flags
  qapi: Add "detect-zeroes" option to drive-mirror
  iotests: Add test cases for drive-mirror "detect-zeroes" option

 block.c                       | 26 ++++++++++++++++++++++++++
 blockdev.c                    | 40 +++++++++++++++++++++++++++-------------
 hmp.c                         |  2 +-
 include/block/block.h         |  3 +++
 qapi/block-core.json          |  4 +++-
 qmp-commands.hx               |  4 +++-
 tests/qemu-iotests/132        | 28 +++++++++++++++++++++++++---
 tests/qemu-iotests/132.out    |  4 ++--
 tests/qemu-iotests/iotests.py |  7 +++++++
 9 files changed, 97 insertions(+), 21 deletions(-)

-- 
2.4.2