The block-stream job needs to own the base node as the limiter for
the copy-on-read operation. So, the base node is included in the
job node list by calling to the function block_job_add_bdrv().
Also, the block-stream job would not allow the base node to go
away due to the graph modification, e.g. when a filter node is
inserted between the bottom node and the base node.
For that reason, the flag BLK_PERM_GRAPH_MOD is unset in the
shared permission bit mask of the base node.

Andrey Shinkevich (2):
  iotests: 030 TestParallelOps non-shared base node
  block-stream: include base node into the job protected list

 block/stream.c         |  9 +++++++++
 tests/qemu-iotests/030 | 34 ++++++++++++++++++----------------
 2 files changed, 27 insertions(+), 16 deletions(-)

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1.8.3.1