This series introduces a bottom intermediate node that eliminates the
dependency on the base that may change while stream job is running.
It happens when stream/commit parallel jobs are running on the same
backing chain. The base node of the stream job may be a top node of
the parallel commit job and can change before the stream job is
completed. We avoid that dependency by introducing the bottom node.

v5: [resend by Vladimir]
  01: use comment wording in block/io.c suggested by Alberto
  Now the whole series are reviewed-by Alberto and me.

v4:
trace_stream_start reverted to the base.
bdrv_is_allocated_above_inclusive() deleted and the new parameter
'bool include_base' was added to the bdrv_is_allocated_above().


Andrey Shinkevich (2):
  block: include base when checking image chain for block allocation
  block/stream: introduce a bottom node

Vladimir Sementsov-Ogievskiy (1):
  block/stream: refactor stream_run: drop goto

 include/block/block.h  |  3 +-
 block/commit.c         |  2 +-
 block/io.c             | 18 ++++++++----
 block/mirror.c         |  2 +-
 block/replication.c    |  2 +-
 block/stream.c         | 62 ++++++++++++++++++++----------------------
 tests/qemu-iotests/245 |  4 +--
 7 files changed, 49 insertions(+), 44 deletions(-)

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2.18.0