On 29.05.19 19:56, Andrey Shinkevich wrote:
> 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.
> 
> v7: [resend by Andrey]
>   01: assert(intermediate) was inserted before the call to
>       bdrv_is_allocated() in the intermediate node loop of the
>       bdrv_is_allocated_above() as suggested by Max.
>   02: The change of the intermediate node loop in the stream_start() was
>       rolled back to its original design and the reassignment of the base
>       node pointer was added as Vladimir and Max suggested. The relevant
>       comment was amended.
> 
> v6: [resend by Vladimir]
>   01: improve comment in block/io.c, suggested by Alberto
> 
> v5: [resend by Vladimir]
>   01: use comment wording in block/io.c suggested by Alberto
> 
> 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 (3):
>   block: include base when checking image chain for block allocation
>   block/stream: refactor stream_run: drop goto
>   block/stream: introduce a bottom node
> 
>  block/commit.c         |  2 +-
>  block/io.c             | 21 +++++++++++++------
>  block/mirror.c         |  2 +-
>  block/replication.c    |  2 +-
>  block/stream.c         | 56 ++++++++++++++++++++++++--------------------------
>  include/block/block.h  |  3 ++-
>  tests/qemu-iotests/245 |  4 ++--
>  7 files changed, 49 insertions(+), 41 deletions(-)

Reviewed-by: Max Reitz <mreitz@redhat.com>

Just needs some simple changes to patch 1 to rebase it on 863cc78f1b3
and c8bb23cbdbe.

Max