Commit 9adc1cb49af8d fixed a bug about unaligned (to dirty bitmap
granularity) guest writes (and discards) by simply requesting
corresponding alignment on mirror-top filter. However forcing large
alignment obviously decreases performance of unaligned requests.

So it's time for a new solution which is in 04. And 05 reverts

01: new fix (do we need it for stable?)
02,03,05: add Max's r-b
04: fix bitmap handling
    improve comments

Vladimir Sementsov-Ogievskiy (5):
  hbitmap: handle set/reset with zero length
  block/mirror: simplify do_sync_target_write
  block/block-backend: add blk_co_pwritev_part
  block/mirror: support unaligned write in active mirror
  Revert "mirror: Only mirror granularity-aligned chunks"

 include/sysemu/block-backend.h |   4 +
 block/block-backend.c          |  17 +++-
 block/mirror.c                 | 181 ++++++++++++++++-----------------
 util/hbitmap.c                 |   8 ++
 4 files changed, 114 insertions(+), 96 deletions(-)


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