[PATCH v2 for-6.0 0/8] nbd reconnect on open

[Vladimir Sementsov-Ogievskiy]

Hi all! There is a new feature: reconnect on open. It is useful when
start of vm and start of nbd server are not simple to sync.

v2: rebase on master.
Also, I've discovered that I've sent downstream version of test which
doesn't work here. So, the test is rewritten (with appropriate
improvements of iotests.py)

Vladimir Sementsov-Ogievskiy (8):
  block/nbd: move initial connect to coroutine
  nbd: allow reconnect on open, with corresponding new options
  iotests.py: fix qemu_tool_pipe_and_status()
  iotests.py: qemu_io(): reuse qemu_tool_pipe_and_status()
  iotests.py: add qemu_tool_popen()
  iotests.py: add and use qemu_io_wrap_args()
  iotests.py: add qemu_io_popen()
  iotests: add 306 to test reconnect on nbd open

 block/nbd.c                   | 173 +++++++++++++++++++++++++---------
 tests/qemu-iotests/306        |  71 ++++++++++++++
 tests/qemu-iotests/306.out    |  11 +++
 tests/qemu-iotests/group      |   1 +
 tests/qemu-iotests/iotests.py |  56 +++++++----
 5 files changed, 246 insertions(+), 66 deletions(-)
 create mode 100755 tests/qemu-iotests/306
 create mode 100644 tests/qemu-iotests/306.out

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2.21.3