[PATCH v9 0/3] NBD reconnect

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

Hi all!
Here is NBD reconnect. Previously, if connection failed all current
and future requests will fail. After the series, nbd-client driver
will try to reconnect unlimited times. During first @reconnect-delay
seconds of reconnecting all requests will wait for the connection,
and if it is established requests will be resent. After
@reconnect-delay period all requests will be failed (until successful
reconnect).

v10:

01: add Eric's r-b
02: drop dead assignment local_err = NULL
    s/nbd_reconnect_loop/nbd_co_reconnect_loop/
03: avoid race conditions + some improvements
  - introduce qemu_io_silent_check and use it to wait for NBD server
    start
  - use size variable instead of '5M' in all places
  - use smart waiting loop instead of sleep, to wait for job progress
  - do srv.wait() after srv.kill(), to be sure that server is stopped
  - drop throttling earlier
  - drop 'quick' tag in group file

Vladimir Sementsov-Ogievskiy (3):
  qemu-coroutine-sleep: introduce qemu_co_sleep_wake
  block/nbd: nbd reconnect
  iotests: test nbd reconnect

 include/qemu/coroutine.h      |  23 ++-
 block/nbd.c                   | 331 +++++++++++++++++++++++++++-------
 util/qemu-coroutine-sleep.c   |  51 ++++--
 tests/qemu-iotests/264        |  95 ++++++++++
 tests/qemu-iotests/264.out    |  13 ++
 tests/qemu-iotests/group      |   1 +
 tests/qemu-iotests/iotests.py |  11 ++
 7 files changed, 447 insertions(+), 78 deletions(-)
 create mode 100755 tests/qemu-iotests/264
 create mode 100644 tests/qemu-iotests/264.out

-- 
2.21.0