[Qemu-block] [PATCH v4 00/10] NBD reconnect

[Vladimir Sementsov-Ogievskiy]

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).

v4: - add Eric's r-b to 01.
    - drop CONNECTING_INIT mode, don't reconnect on _open.
    - new api: only one parameter @reconnect-delay
    - new interval scheme between reconnect attempts
        (1 - 2 - 4 - 8 - 16 - 16 ... seconds)
    - fixes and refactorings in main patch (09), including merge with
      old 08 patch
    

v3:
06: fix build error in function 'nbd_co_send_request':
     error: 'i' may be used uninitialized in this function

v2 notes:
Here is v2 of NBD reconnect, but it is very very different from v1, so,
forget about v1.
The series includes my "NBD reconnect: preliminary refactoring", with
changes in 05: leave asserts (Eric).

Vladimir Sementsov-Ogievskiy (10):
  block/nbd-client: split channel errors from export errors
  block/nbd: move connection code from block/nbd to block/nbd-client
  block/nbd-client: split connection from initialization
  block/nbd-client: fix nbd_reply_chunk_iter_receive
  block/nbd-client: don't check ioc
  block/nbd-client: move from quit to state
  block/nbd-client: rename read_reply_co to connection_co
  block/nbd: add cmdline and qapi parameter reconnect-delay
  block/nbd-client: nbd reconnect
  iotests: test nbd reconnect

 qapi/block-core.json          |  12 +-
 block/nbd-client.h            |  20 +-
 block/nbd-client.c            | 515 +++++++++++++++++++++++++++++++-----------
 block/nbd.c                   |  56 ++---
 tests/qemu-iotests/220        |  67 ++++++
 tests/qemu-iotests/220.out    |   7 +
 tests/qemu-iotests/group      |   1 +
 tests/qemu-iotests/iotests.py |   4 +
 8 files changed, 512 insertions(+), 170 deletions(-)
 create mode 100755 tests/qemu-iotests/220
 create mode 100644 tests/qemu-iotests/220.out

-- 
2.11.1