[Qemu-block] [PATCH v8 0/7] backup-top filter driver for backup

[Vladimir Sementsov-Ogievskiy]

Hi all!

These series introduce backup-top driver. It's a filter-node, which
do copy-before-write operation. Mirror uses filter-node for handling
guest writes, let's move to filter-node (from write-notifiers) for
backup too

v8:
01-03: new
05: add Max's r-b
others changed, change description in each patch mail in Notes section.

v6-v7 was preparing refactoring, which now is in Max's pull request, and
these series based on it:
Based-on: https://lists.gnu.org/archive/html/qemu-devel/2019-05/msg06526.html

Vladimir Sementsov-Ogievskiy (7):
  block: teach bdrv_debug_breakpoint skip filters with backing
  block: swap operation order in bdrv_append
  block: allow not one child for implicit node
  block: introduce backup-top filter driver
  block/io: refactor wait_serialising_requests
  block: add lock/unlock range functions
  block/backup: use backup-top instead of write notifiers

 block/backup-top.h         |  64 ++++++++
 include/block/block_int.h  |   4 +
 block.c                    |  60 +++++--
 block/backup-top.c         | 322 +++++++++++++++++++++++++++++++++++++
 block/backup.c             | 171 ++++++++------------
 block/io.c                 |  68 ++++++--
 block/Makefile.objs        |   2 +
 tests/qemu-iotests/056     |   2 +-
 tests/qemu-iotests/085.out |   2 +-
 tests/qemu-iotests/129     |   1 -
 tests/qemu-iotests/141.out |   2 +-
 11 files changed, 567 insertions(+), 131 deletions(-)
 create mode 100644 block/backup-top.h
 create mode 100644 block/backup-top.c

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2.18.0