[PATCH v15 0/5] 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.

Preparation patches are queued in Max's block branch:

Based-on: https://github.com/XanClic/qemu.git block

v15: use BdrvChildren in block-copy
01-03: new
04-05: a lot of changes, such as
04:
    - add new parameters for creation
    - prepare bcs creation
    - add target child
    - refactor bdrv_backup_top_append
    - drop r-b
05:
    - move block-copy to use BdrvChildren
    - drop extra style fixing hunks
    - iotest 141 output changed

v14: Drop range locks, keep old good in-flight requests waiting

12: new patch
14: use old request-waiting scheme instead of range locks

Vladimir Sementsov-Ogievskiy (5):
  block/backup: move in-flight requests handling from backup to
    block-copy
  block/backup: move write_flags calculation inside backup_job_create
  block/block-copy: split block_copy_set_callbacks function
  block: introduce backup-top filter driver
  block/backup: use backup-top instead of write notifiers

 qapi/block-core.json       |   8 +-
 block/backup-top.h         |  41 +++++
 include/block/block-copy.h |  31 +++-
 include/block/block_int.h  |   1 +
 block/backup-top.c         | 276 +++++++++++++++++++++++++++++++++
 block/backup.c             | 147 +++++-------------
 block/block-copy.c         | 140 +++++++++--------
 block/replication.c        |   2 +-
 blockdev.c                 |   1 +
 block/Makefile.objs        |   1 +
 tests/qemu-iotests/056     |   8 +-
 tests/qemu-iotests/141.out |   2 +-
 tests/qemu-iotests/257     |   7 +-
 tests/qemu-iotests/257.out | 306 ++++++++++++++++++-------------------
 14 files changed, 628 insertions(+), 343 deletions(-)
 create mode 100644 block/backup-top.h
 create mode 100644 block/backup-top.c

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2.21.0