[PATCH v2 for-5.1? 0/5] Fix nbd reconnect dead-locks

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Hi all!

v2: it's a bit updated "[PATCH for-5.1? 0/3] Fix nbd reconnect dead-locks"
plus completely rewritten "[PATCH for-5.1? 0/4] non-blocking connect"
(which is now the only one patch 05)

01: new
02: rebased on 01, fix (add outer "if")
03-04: add Eric's r-b:
05: new

If 05 is too big for 5.1, it's OK to take only 01-04 or less, as well as
postponing everything to 5.2, as it's all not a degradation of 5.1
(it's a degradation of 4.2, together with the whole reconnect feature).

Vladimir Sementsov-Ogievskiy (5):
  block/nbd: split nbd_establish_connection out of nbd_client_connect
  block/nbd: allow drain during reconnect attempt
  block/nbd: on shutdown terminate connection attempt
  block/nbd: nbd_co_reconnect_loop(): don't sleep if drained
  block/nbd: use non-blocking connect: fix vm hang on connect()

 block/nbd.c        | 360 +++++++++++++++++++++++++++++++++++++++++----
 block/trace-events |   4 +-
 2 files changed, 331 insertions(+), 33 deletions(-)

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2.21.0