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[Qemu-devel] [PATCH 0/2] mirror: Allow detection of zeroes on source sec


From: Fam Zheng
Subject: [Qemu-devel] [PATCH 0/2] mirror: Allow detection of zeroes on source sectors
Date: Mon, 8 Jun 2015 15:06:23 +0800

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

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 (2):
  qapi: Add "detect-zeroes" option to drive-mirror
  iotests: Add test cases for drive-mirror "detect-zeroes" option

 block/mirror.c                | 21 +++++++++++++++------
 blockdev.c                    |  6 +++++-
 hmp.c                         |  2 +-
 include/block/block_int.h     |  3 ++-
 qapi/block-core.json          |  4 +++-
 qmp-commands.hx               |  4 +++-
 tests/qemu-iotests/132        | 26 +++++++++++++++++++++++---
 tests/qemu-iotests/132.out    |  4 ++--
 tests/qemu-iotests/iotests.py |  7 +++++++
 9 files changed, 61 insertions(+), 16 deletions(-)

-- 
2.4.2




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