[Qemu-devel] [PATCH v8 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).


With Stefan's pull request for his dataplane series now out, I thought
this a good opportunity to send a rebase of this series.

Patches 7 and 9 through 13 are yet to be reviewed, if I can trust grep.


v8: Rebased on Stefan's block branch
- Patch 5: modify qapi/block-core.json rather than qapi-schema.json
- Patch 12: test number 092 is taken, move to 094
- Patch 13: test number 093 will be taken (by Fam), move to 095

v7:
- Patch 1: rephrased comment [Eric]
- Patch 3:
  - give BDRV_REQ_MAY_UNMAP to bdrv_write_zeroes() [Eric]
  - adjusted comment about calculation of total cluster count [Eric]
  - added error handling for bdrv_discard() [Eric]
- Patch 7: replaced qemu_aio_wait() by aio_poll()
  [Stefan's dataplane series]
- Patch 8: rephrased comment and manpage content [Eric]
- Patch 12: more test passes for implicit and explicit -d


git-backport-diff output against v7:

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:[----] [--] 'blockjob: Add "ready" field'
006/14:[----] [--] 'block/mirror: Improve progress report'
007/14:[----] [-C] '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:[0002] [FC] 'iotests: Add test for backing-chain commits'
013/14:[0002] [FC] 'iotests: Add test for qcow2's bdrv_make_empty'
014/14:[----] [--] '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                   |  32 ++--
 block/qcow2-cluster.c            |  27 ++-
 block/qcow2-snapshot.c           |   2 +-
 block/qcow2.c                    | 388 ++++++++++++++++++++++++++++++++++++++-
 block/qcow2.h                    |   2 +-
 blockjob.c                       |  46 ++++-
 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/094           | 122 ++++++++++++
 tests/qemu-iotests/094.out       | 119 ++++++++++++
 tests/qemu-iotests/095           |  72 ++++++++
 tests/qemu-iotests/095.out       |  26 +++
 tests/qemu-iotests/common.filter |   7 +
 tests/qemu-iotests/group         |   2 +
 tests/qemu-iotests/iotests.py    |   3 +-
 21 files changed, 980 insertions(+), 67 deletions(-)
 create mode 100755 tests/qemu-iotests/094
 create mode 100644 tests/qemu-iotests/094.out
 create mode 100755 tests/qemu-iotests/095
 create mode 100644 tests/qemu-iotests/095.out

-- 
2.0.0