[Qemu-block] [PATCH v3 for-4.1? 0/9] qcow2-bitmaps: rewrite reopening logic

[Vladimir Sementsov-Ogievskiy]

Hi all!

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

v3:
02: John's events_wait already merged in, so my 02 from v2 is not needed.
    Instead, add two simple logging wrappers here
03: rebase on 02 - use new wrappers, move to 260
05: add John's r-b
06: improve function docs [John], add John's r-b

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
  iotests.py: add event_wait_log and events_wait_log helpers
  iotests: add test 260 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          | 149 +++++++++++++++++++------------
 block/qcow2.c                 |   9 +-
 tests/qemu-iotests/260        |  87 ++++++++++++++++++
 tests/qemu-iotests/260.out    |  52 +++++++++++
 tests/qemu-iotests/group      |   1 +
 tests/qemu-iotests/iotests.py |  10 +++
 11 files changed, 384 insertions(+), 114 deletions(-)
 create mode 100755 tests/qemu-iotests/260
 create mode 100644 tests/qemu-iotests/260.out

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2.18.0