[Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps

[Vladimir Sementsov-Ogievskiy]

This series add persistent dirty bitmaps feature to qcow2.
Specification is in docs/spec/qcow2.txt (not merged yet, see
[PATCH v10] spec: add qcow2 bitmaps extension specification)

This series are based on Fam's
[PATCH v2 00/13] Dirty bitmap changes for migration/persistence work
(meta bitmaps not used, and only hbitmap_deserialize_finish from
serialization)

This also needs some preparation patches, most of them are in my
bitmap-migration series. I've not listed them here to keep things
simpler, this is RFC any way.

v4:

Previous version was posted more than five months ago, so I will not
carefully list all changes.

What should be noted:
 - some changes are made to sutisfy last version of specification
   - removed staff, related to possibility of saving bitmaps for one
     disk in the other qcow2.
 - to make bitmap store/load zero-copy, I've moved load/store code to
   HBitmap - this is new patch 01.
   so, bdrv_dirty_bitmap_serialize_part and friends are not needed,
   only hbitmap_deserialize_finish, to repair bitmap consistency after
   loading its last level.
 - two patches added about AUTO and EXTRA_DATA_COMPATIBLE flags
 - some fixes made after John's comments on v3

Vladimir Sementsov-Ogievskiy (17):
  hbitmap: load/store
  qcow2: Bitmaps extension: structs and consts
  qcow2-dirty-bitmap: read dirty bitmap directory
  qcow2-dirty-bitmap: add qcow2_bitmap_load()
  qcow2-dirty-bitmap: add qcow2_bitmap_store()
  qcow2: add dirty bitmaps extension
  qcow2-dirty-bitmap: add qcow2_bitmap_load_check()
  block: store persistent dirty bitmaps
  block: add bdrv_load_dirty_bitmap()
  qcow2-dirty-bitmap: add autoclear bit
  qemu: command line option for dirty bitmaps
  qcow2-dirty-bitmap: add IN_USE flag
  qcow2-dirty-bitmaps: disallow stroing bitmap to other bs
  iotests: add VM.test_launcn()
  iotests: test internal persistent dirty bitmap
  qcow2-dirty-bitmap: add AUTO flag
  qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag

 block.c                       |   3 +
 block/Makefile.objs           |   2 +-
 block/dirty-bitmap.c          | 101 +++++
 block/qcow2-dirty-bitmap.c    | 839 ++++++++++++++++++++++++++++++++++++++++++
 block/qcow2.c                 | 105 +++++-
 block/qcow2.h                 |  59 +++
 blockdev.c                    |  36 ++
 include/block/block_int.h     |   9 +
 include/block/dirty-bitmap.h  |  21 ++
 include/qemu/hbitmap.h        |  12 +
 include/sysemu/blockdev.h     |   1 +
 include/sysemu/sysemu.h       |   1 +
 qemu-options.hx               |  35 ++
 tests/qemu-iotests/160        | 112 ++++++
 tests/qemu-iotests/160.out    |  21 ++
 tests/qemu-iotests/group      |   1 +
 tests/qemu-iotests/iotests.py |  25 ++
 util/hbitmap.c                | 182 +++++++++
 vl.c                          |  78 ++++
 19 files changed, 1640 insertions(+), 3 deletions(-)
 create mode 100644 block/qcow2-dirty-bitmap.c
 create mode 100755 tests/qemu-iotests/160
 create mode 100644 tests/qemu-iotests/160.out

-- 
1.8.3.1