[Qemu-devel] [PATCH v7 0/9] 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).

v7:
almost all: rebased on merged nbd.c and nbd-client.c (including patch subject)
01-04: add Eric's r-b
04: wording
05: new
06: rewrite to remove timer earlier
07: new
08:
 - rebase on 05 and 07
 - drop "All rights reserved"
 - handle drain
 - improve handling aio context attach
09: move 249 -> 257

Vladimir Sementsov-Ogievskiy (9):
  block/nbd: split connection_co start out of nbd_client_connect
  block/nbd: use non-blocking io channel for nbd negotiation
  block/nbd: move from quit to state
  block/nbd: add cmdline and qapi parameter reconnect-delay
  block/nbd: refactor nbd connection parameters
  qemu-coroutine-sleep: introduce qemu_co_sleep_wake
  qemu/units: add SI decimal units
  block/nbd: nbd reconnect
  iotests: test nbd reconnect

 qapi/block-core.json          |  11 +-
 include/block/nbd.h           |   3 +-
 include/qemu/coroutine.h      |  17 +-
 include/qemu/units.h          |   7 +
 block/nbd.c                   | 531 +++++++++++++++++++++++++---------
 block/null.c                  |   2 +-
 block/sheepdog.c              |   2 +-
 nbd/client.c                  |  16 +-
 qemu-nbd.c                    |   2 +-
 tests/test-bdrv-drain.c       |   6 +-
 tests/test-block-iothread.c   |   2 +-
 util/qemu-coroutine-sleep.c   |  47 ++-
 tests/qemu-iotests/257        |  63 ++++
 tests/qemu-iotests/257.out    |  10 +
 tests/qemu-iotests/group      |   1 +
 tests/qemu-iotests/iotests.py |   4 +
 16 files changed, 551 insertions(+), 173 deletions(-)
 create mode 100755 tests/qemu-iotests/257
 create mode 100644 tests/qemu-iotests/257.out

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2.18.0