[Qemu-devel] [PATCH v2 0/4] mirror: Fix behavior for zero byte image

[Fam Zheng <famz@redhat.com>]

The current behavior of mirroring zero byte image is slightly different from
non-zero image: the BLOCK_JOB_READY event is skipped and job is completed
immediately. This is not a big problem for human user but only makes management
software harder to write. Since we are focusing on an good API instead of UI,
let's make the behavior more consistent and predictable.

The first patch fixes the behavior. The following two patches add test case for
the involved code path.

Thanks for Eric Blake to report this!


v2: Address Stefan's comments.

    - Added patch 01: block_job_yield.
    - Use block_job_yield in 02.
    - Fix test case updates.

Thanks to Stefan, Paolo and Eric for reviewing!

Fam


Fam Zheng (4):
  blockjob: Add block_job_yield()
  mirror: Go through ready -> complete process for 0 len image
  qemu-iotests: Test BLOCK_JOB_READY event for 0Kb image active commit
  qemu-iotests: Test 0-length image for mirror

 block/mirror.c             | 11 ++++++++++-
 blockjob.c                 | 14 ++++++++++++++
 include/block/blockjob.h   |  8 ++++++++
 tests/qemu-iotests/040     | 12 +++++++++---
 tests/qemu-iotests/040.out |  4 ++--
 tests/qemu-iotests/041     |  9 ++++++---
 tests/qemu-iotests/041.out |  4 ++--
 7 files changed, 51 insertions(+), 11 deletions(-)

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2.0.0