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[Qemu-block] [PATCH v3 0/7] backup improvements

From: Vladimir Sementsov-Ogievskiy
Subject: [Qemu-block] [PATCH v3 0/7] backup improvements
Date: Sat, 10 Aug 2019 22:31:48 +0300

Hi all!

There are some fixes and refactorings I need on my way to resend
my backup-top series. It's obvious now that I need to share copying
code between backup and backup-top, as backup copying code becomes
smarter and more complicated. So the goal of the series is to make copying
code more share-able.

Based-on: https://github.com/jnsnow/qemu bitmaps 

03: Ha, fix real bug, we shouldn't touch src before handling write-zero,
    as src may be NULL. So, replace align and max_transfer calculation
    together with max_transfer == 0 check. Drop comment, as there is no
    special place for it now..
04: add Max's r-b:
06-07: rewrite to keep bounce_buffer sharing between iterations and to
       limit allocation [Eric]

v2 (by Max's comments):

02: Add Max's r-b
03: - split out backup changes to 03
   - handle common max_transfer = 0 case
04: splat out from 02
06: fix allocation size
07: - rebase on 06 changes
   - add Max's r-b

two patches are dropped or postponed for the next step

Vladimir Sementsov-Ogievskiy (7):
  block/backup: deal with zero detection
  block/backup: refactor write_flags
  block/io: handle alignment and max_transfer for copy_range
  block/backup: drop handling of max_transfer for copy_range
  block/backup: fix backup_cow_with_offload for last cluster
  block/backup: teach backup_cow_with_bounce_buffer to copy more at once
  block/backup: merge duplicated logic into backup_do_cow

 block/backup.c | 154 ++++++++++++++++++++++---------------------------
 block/io.c     |  44 +++++++++++---
 blockdev.c     |   8 +--
 3 files changed, 110 insertions(+), 96 deletions(-)


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