I still think we should keep dropped iotest by introducing "bottom" interface 
for stream job. And deprecate old interfaces.
Patch is better than arguing, so I decided to try it myself. Now I'm close to 
complete v14, so, will send it soon.

02.12.2020 21:30, Andrey Shinkevich wrote:
The previous version 12 was discussed in the email thread:
Message-Id: <1603390423-980205-1-git-send-email-andrey.shinkev...@virtuozzo.com>

v13:
   02: The bdrv_remove_node() was dropped.
   05: Three patches with fixes were merged into one.
   06: Minor changes based on Vladimir's suggestions.
   08: Three patches with fixes were merged into one.
   09: The search for format_name of backing file was added.
   10: The flag BLK_PERM_GRAPH_MOD was removed.

Andrey Shinkevich (10):
   copy-on-read: support preadv/pwritev_part functions
   block: add API function to insert a node
   copy-on-read: add filter drop function
   qapi: add filter-node-name to block-stream
   qapi: create BlockdevOptionsCor structure for COR driver
   iotests: add #310 to test bottom node in COR driver
   block: include supported_read_flags into BDS structure
   copy-on-read: skip non-guest reads if no copy needed
   stream: skip filters when writing backing file name to QCOW2 header
   block: apply COR-filter to block-stream jobs

  block.c                        |  25 +++++++
  block/copy-on-read.c           | 143 +++++++++++++++++++++++++++++++++++++----
  block/copy-on-read.h           |  32 +++++++++
  block/io.c                     |  12 +++-
  block/monitor/block-hmp-cmds.c |   4 +-
  block/stream.c                 | 120 +++++++++++++++++++++++-----------
  blockdev.c                     |  12 ++--
  include/block/block.h          |  10 ++-
  include/block/block_int.h      |  11 +++-
  qapi/block-core.json           |  27 +++++++-
  tests/qemu-iotests/030         |  51 ++-------------
  tests/qemu-iotests/030.out     |   4 +-
  tests/qemu-iotests/141.out     |   2 +-
  tests/qemu-iotests/245         |  22 +++++--
  tests/qemu-iotests/310         | 114 ++++++++++++++++++++++++++++++++
  tests/qemu-iotests/310.out     |  15 +++++
  tests/qemu-iotests/group       |   1 +
  17 files changed, 484 insertions(+), 121 deletions(-)
  create mode 100644 block/copy-on-read.h
  create mode 100755 tests/qemu-iotests/310
  create mode 100644 tests/qemu-iotests/310.out



--
Best regards,
Vladimir

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