Hi all!

Bitmaps reopening is buggy, we may easily produce broken incremental
backup if we do temporary snapshot. Let's fix it!

v2:
01: new
02-03: test: splat into two patches, some wording
       improvements and event_wait improved
04: add John's r-b
05: new
06-09: fixes: changed, splat, use patch 01

Vladimir Sementsov-Ogievskiy (9):
  block: add .bdrv_need_rw_file_child_during_reopen_rw handler
  python/qemu: improve event_wait method of vm
  iotests: add test 255 to check bitmap life after snapshot + commit
  block/qcow2-bitmap: get rid of bdrv_has_changed_persistent_bitmaps
  block/qcow2-bitmap: drop qcow2_reopen_bitmaps_rw_hint()
  block/qcow2-bitmap: do not remove bitmaps on reopen-ro
  block/qcow2-bitmap: fix and improve qcow2_reopen_bitmaps_rw
  block/qcow2-bitmap: fix reopening bitmaps to RW
  qcow2-bitmap: move bitmap reopen-rw code to qcow2_reopen_prepare

 block/qcow2.h                 |   6 +-
 include/block/block_int.h     |   8 +-
 include/block/dirty-bitmap.h  |   1 -
 block.c                       | 163 +++++++++++++++++++++++++++-------
 block/dirty-bitmap.c          |  12 ---
 block/qcow2-bitmap.c          | 146 ++++++++++++++++++------------
 block/qcow2.c                 |   9 +-
 python/qemu/__init__.py       |   9 +-
 tests/qemu-iotests/255        |  86 ++++++++++++++++++
 tests/qemu-iotests/255.out    |  52 +++++++++++
 tests/qemu-iotests/group      |   1 +
 tests/qemu-iotests/iotests.py |   5 ++
 12 files changed, 381 insertions(+), 117 deletions(-)
 create mode 100755 tests/qemu-iotests/255
 create mode 100644 tests/qemu-iotests/255.out

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2.18.0