Hi all!

On the way of backup schemes development (and in general any complicated
developments in Qemu block layer) it would be good to have an ability to 
print
out graph of block nodes with their permissions. Just look at attached 
picture.

v2: major rework: Identifying non-bds nodes by their description was a 
bad idea,
descriptions are not guaranteed to be different for different nodes. So, 
the only
way is use pointer to identify them. And to be unique, let's use pointers to
identify all the nodes in the graph. As additional benefit, we have 
pointers for
each node, which is good for debugging (imagine a gdb session).

Vladimir Sementsov-Ogievskiy (3):
   qapi: add x-query-block-graph
   scripts: add render_block_graph function for QEMUMachine
   not-for-commit: example of new command usage for debugging

  qapi/block-core.json          | 116 
++++++++++++++++++++++++++++++++++++++++++
  include/block/block.h         |   1 +
  block.c                       |  80 +++++++++++++++++++++++++++++
  blockdev.c                    |   5 ++
  scripts/render_block_graph.py |  78 ++++++++++++++++++++++++++++
  tests/qemu-iotests/222        |   3 ++
  6 files changed, 283 insertions(+)
  create mode 100644 scripts/render_block_graph.py

-- 
2.11.1