[Qemu-devel] [PATCH 0/4] active-mirror: support unaligned guest operations

[Vladimir Sementsov-Ogievskiy]

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 03. And 04 reverts
9adc1cb49af8d.

Vladimir Sementsov-Ogievskiy (4):
  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                 | 153 +++++++++++++--------------------
 3 files changed, 78 insertions(+), 96 deletions(-)

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2.21.0