[Qemu-devel] [PATCH v6 00/14] qemu-img: Implement commit like QMP

[Max Reitz]

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).


This series (as of v6) depends on the "[PATCH 0/2] qcow2: Fix discard"
series.


v6:
- Patch 1: Rebased on "[PATCH 0/2] qcow2: Fix discard"
- Patch 2:
  - use QCOW2_DISCARD_SNAPSHOT [Kevin]
  - increase the number of clusters discarded per step [Kevin]
- Patch 3: Added. This patch adds a much faster way of emptying a qcow2
  image as long as there are no internal snapshots. It is however
  optional, and may therefore be excluded from this series without
  causing problems, as long as patch 13 is excluded as well which adds a
  test case for this implementation.
- Patch 6 (previously 5): Changed due to Fam's fixes in mirror.c
- Patch 8: Completely reworked from previous patch 7:
  - add -d flag for inhibiting bdrv_make_empty() [Eric]
  - no need to empty the whole backing chain; -d will be implicit
    whenever -b is given as well, therefore only the top image has to be
    emptied (if any) [Eric]
- Patch 9 (previously 8):
  - fixed spelling mistake [Eric]
  - swapped order of p and q in getopt() [Eric]
  - rebased on patch 8's changes
- Patch 10 (previously 9):
  - -b implies -d [Eric]
  - rebased on patch 8's changes
- Patch 12 (previously 11):
  - if -b is given, no image will be emptied as of this version; the
    test has been adjusted accordingly
  - bumped test number to 092 to avoid conflict with Fam's series
- Patch 13: Added as a test for the added patch 3.
- Patch 14:
  - assert that data/offset == data/len after the block job finishes
    [Eric]
  - rebased on Fam's changes in iotests.py:wait_until_completed


git-backport-diff output against v5:

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:[0013] [FC] 'qcow2: Allow "full" discard'
002/14:[0035] [FC] 'qcow2: Implement bdrv_make_empty()'
003/14:[down] 'qcow2: Optimize bdrv_make_empty()'
004/14:[----] [--] 'blockjob: Introduce block_job_complete_sync()'
005/14:[----] [--] 'blockjob: Add "ready" field'
006/14:[0008] [FC] 'block/mirror: Improve progress report'
007/14:[----] [--] 'qemu-img: Implement commit like QMP'
008/14:[down] 'qemu-img: Empty image after commit'
009/14:[0022] [FC] 'qemu-img: Enable progress output for commit'
010/14:[0021] [FC] 'qemu-img: Specify backing file for commit'
011/14:[----] [--] 'iotests: Add _filter_qemu_img_map'
012/14:[0022] [FC] 'iotests: Add test for backing-chain commits'
013/14:[down] 'iotests: Add test for qcow2's bdrv_make_empty'
014/14:[0005] [FC] '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                    | 384 ++++++++++++++++++++++++++++++++++++++-
 block/qcow2.h                    |   2 +-
 blockjob.c                       |  46 ++++-
 include/block/blockjob.h         |  20 ++
 qapi-schema.json                 |   4 +-
 qemu-img-cmds.hx                 |   4 +-
 qemu-img.c                       | 147 ++++++++++++---
 qemu-img.texi                    |  13 +-
 tests/qemu-iotests/040           |   4 +-
 tests/qemu-iotests/041           |   3 +-
 tests/qemu-iotests/092           | 108 +++++++++++
 tests/qemu-iotests/092.out       |  59 ++++++
 tests/qemu-iotests/093           |  72 ++++++++
 tests/qemu-iotests/093.out       |  26 +++
 tests/qemu-iotests/common.filter |   7 +
 tests/qemu-iotests/group         |   2 +
 tests/qemu-iotests/iotests.py    |   3 +-
 21 files changed, 900 insertions(+), 67 deletions(-)
 create mode 100755 tests/qemu-iotests/092
 create mode 100644 tests/qemu-iotests/092.out
 create mode 100755 tests/qemu-iotests/093
 create mode 100644 tests/qemu-iotests/093.out

-- 
1.9.2