[Qemu-devel] [PATCH v9 00/14] qemu-img: Implement commit like QMP

[Max Reitz <mreitz@redhat.com>]

qemu-img should use QMP commands whenever possible in order to ensure
feature completeness of both online and offline image operations. For
the "commit" command, this is relatively easy, so implement it first
(in the hope that indeed others will follow).

As qemu-img does not have access to QMP (due to QMP being intertwined
with basically everything in qemu), we cannot directly use QMP, but at
least use the functions the corresponding QMP commands are using (which
would be "block-commit", in this case).


I'll still take a look on Kevin's proposal for patch 3 (make use of lazy
refcounts to simplify emptying a snapshot-less qcow2 image), but I still
think we'll need the size-calculation function anyway; that is why I
sent this version which still uses that function and no lazy refcounts.

In case using lazy refcounts turns out to be vastly easier (which I
actually think it will), I'll send an alternative for patch 3; the other
patches should be untouched by the decision which version is used
(except probably the test from patch 13).


v9: Rebase on master
- Patch 5: block_job_ready() is now called block_job_event_ready() and
  has been changed in the meantime
- Patch 6: rebased on the fixes for zero-length mirrors
- Patch 12: test number 094 is now taken as well, move to 097
- Patch 13:
  - test number 095 is taken, move to 098
  - remove blkdebug.conf when test is done
  - filter out test directory and image format from the commit output


Key:
[----] : patches are identical
[####] : number of functional differences between upstream/downstream patch
[down] : patch is downstream-only
The flags [FC] indicate (F)unctional and (C)ontextual differences, respectively

001/14:[----] [--] 'qcow2: Allow "full" discard'
002/14:[----] [--] 'qcow2: Implement bdrv_make_empty()'
003/14:[----] [--] 'qcow2: Optimize bdrv_make_empty()'
004/14:[----] [--] 'blockjob: Introduce block_job_complete_sync()'
005/14:[0004] [FC] 'blockjob: Add "ready" field'
006/14:[0006] [FC] 'block/mirror: Improve progress report'
007/14:[----] [--] 'qemu-img: Implement commit like QMP'
008/14:[----] [--] 'qemu-img: Empty image after commit'
009/14:[----] [--] 'qemu-img: Enable progress output for commit'
010/14:[----] [--] 'qemu-img: Specify backing file for commit'
011/14:[----] [--] 'iotests: Add _filter_qemu_img_map'
012/14:[0004] [FC] 'iotests: Add test for backing-chain commits'
013/14:[0013] [FC] 'iotests: Add test for qcow2's bdrv_make_empty'
014/14:[----] [-C] 'iotests: Omit length/offset test in 040 and 041'


Max Reitz (14):
  qcow2: Allow "full" discard
  qcow2: Implement bdrv_make_empty()
  qcow2: Optimize bdrv_make_empty()
  blockjob: Introduce block_job_complete_sync()
  blockjob: Add "ready" field
  block/mirror: Improve progress report
  qemu-img: Implement commit like QMP
  qemu-img: Empty image after commit
  qemu-img: Enable progress output for commit
  qemu-img: Specify backing file for commit
  iotests: Add _filter_qemu_img_map
  iotests: Add test for backing-chain commits
  iotests: Add test for qcow2's bdrv_make_empty
  iotests: Omit length/offset test in 040 and 041

 block/Makefile.objs              |   2 +-
 block/mirror.c                   |  34 ++--
 block/qcow2-cluster.c            |  27 ++-
 block/qcow2-snapshot.c           |   2 +-
 block/qcow2.c                    | 388 ++++++++++++++++++++++++++++++++++++++-
 block/qcow2.h                    |   2 +-
 blockjob.c                       |  42 ++++-
 include/block/blockjob.h         |  20 ++
 qapi/block-core.json             |   4 +-
 qemu-img-cmds.hx                 |   4 +-
 qemu-img.c                       | 149 ++++++++++++---
 qemu-img.texi                    |  13 +-
 tests/qemu-iotests/040           |   4 +-
 tests/qemu-iotests/041           |   3 +-
 tests/qemu-iotests/097           | 122 ++++++++++++
 tests/qemu-iotests/097.out       | 119 ++++++++++++
 tests/qemu-iotests/098           |  75 ++++++++
 tests/qemu-iotests/098.out       |  26 +++
 tests/qemu-iotests/common.filter |   7 +
 tests/qemu-iotests/group         |   2 +
 tests/qemu-iotests/iotests.py    |   3 +-
 21 files changed, 981 insertions(+), 67 deletions(-)
 create mode 100755 tests/qemu-iotests/097
 create mode 100644 tests/qemu-iotests/097.out
 create mode 100755 tests/qemu-iotests/098
 create mode 100644 tests/qemu-iotests/098.out

-- 
2.0.1